/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/nested_delay_nd.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:16:28,710 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:16:28,711 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:16:28,735 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:16:28,751 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:16:28,753 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:16:28,754 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:16:28,755 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:16:28,755 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:16:28,756 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:16:28,759 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:16:28,763 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:16:28,764 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:16:28,765 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:16:28,766 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:16:28,767 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:16:28,772 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:16:28,778 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:16:28,778 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:16:28,779 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:16:28,782 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:16:28,804 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:16:28,804 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:16:28,805 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:16:28,805 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:16:28,805 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:16:28,805 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:16:28,805 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:16:28,805 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:16:28,805 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:16:28,805 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:16:28,806 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:16:28,806 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:16:28,806 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:16:28,806 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:16:28,806 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:16:28,806 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:16:28,806 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:16:28,806 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:16:28,806 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:16:28,806 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:16:28,806 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:16:28,807 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:16:28,807 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:16:28,807 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:16:28,807 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:16:28,807 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:16:28,807 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:16:28,807 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:16:28,807 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:16:29,057 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:16:29,071 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:16:29,072 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:16:29,073 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:16:29,073 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:16:29,074 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c [2021-05-02 13:16:29,116 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/094d22990/cfd742a3eb054b7fa1e484f8e0fa0c67/FLAG1b6cc890d [2021-05-02 13:16:29,467 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:16:29,467 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c [2021-05-02 13:16:29,472 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/094d22990/cfd742a3eb054b7fa1e484f8e0fa0c67/FLAG1b6cc890d [2021-05-02 13:16:29,488 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/094d22990/cfd742a3eb054b7fa1e484f8e0fa0c67 [2021-05-02 13:16:29,490 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:16:29,492 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:16:29,494 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:16:29,494 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:16:29,497 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:16:29,498 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:16:29" (1/1) ... [2021-05-02 13:16:29,498 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3785d5ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:16:29, skipping insertion in model container [2021-05-02 13:16:29,498 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:16:29" (1/1) ... [2021-05-02 13:16:29,503 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:16:29,518 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:16:29,639 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/nested_delay_nd.c[465,478] [2021-05-02 13:16:29,651 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:16:29,656 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:16:29,690 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/nested_delay_nd.c[465,478] [2021-05-02 13:16:29,710 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:16:29,721 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:16:29,722 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:16:29 WrapperNode [2021-05-02 13:16:29,722 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:16:29,723 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:16:29,724 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:16:29,725 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:16:29,732 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:16:29" (1/1) ... [2021-05-02 13:16:29,732 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:16:29" (1/1) ... [2021-05-02 13:16:29,737 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:16:29" (1/1) ... [2021-05-02 13:16:29,737 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:16:29" (1/1) ... [2021-05-02 13:16:29,747 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:16:29" (1/1) ... [2021-05-02 13:16:29,751 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:16:29" (1/1) ... [2021-05-02 13:16:29,755 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:16:29" (1/1) ... [2021-05-02 13:16:29,758 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:16:29,759 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:16:29,759 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:16:29,759 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:16:29,760 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:16:29" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:16:29,820 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:16:29,820 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:16:29,820 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:16:29,820 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 13:16:29,820 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:16:29,820 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:16:29,821 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:16:29,821 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:16:29,821 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:16:29,821 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:16:29,821 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 13:16:29,821 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 13:16:29,822 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:16:29,822 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:16:29,822 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:16:29,823 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:16:29,823 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:16:29,823 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:16:29,823 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:16:29,823 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:16:30,090 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:16:30,091 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 13:16:30,092 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:16:30 BoogieIcfgContainer [2021-05-02 13:16:30,092 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:16:30,093 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:16:30,093 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:16:30,095 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:16:30,095 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:16:29" (1/3) ... [2021-05-02 13:16:30,096 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@664daf06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:16:30, skipping insertion in model container [2021-05-02 13:16:30,096 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:16:29" (2/3) ... [2021-05-02 13:16:30,096 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@664daf06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:16:30, skipping insertion in model container [2021-05-02 13:16:30,096 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:16:30" (3/3) ... [2021-05-02 13:16:30,099 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_delay_nd.c [2021-05-02 13:16:30,105 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:16:30,108 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:16:30,119 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:16:30,144 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:16:30,144 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:16:30,145 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:16:30,145 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:16:30,145 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:16:30,145 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:16:30,145 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:16:30,145 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:16:30,156 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 24 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 13:16:30,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:16:30,160 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:30,160 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:30,160 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:30,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:30,164 INFO L82 PathProgramCache]: Analyzing trace with hash -1039138334, now seen corresponding path program 1 times [2021-05-02 13:16:30,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:30,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511405952] [2021-05-02 13:16:30,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:30,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:30,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:30,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:30,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:30,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:30,386 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:30,386 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:30,386 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511405952] [2021-05-02 13:16:30,387 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1511405952] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:16:30,387 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:16:30,387 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:16:30,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003642565] [2021-05-02 13:16:30,390 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:16:30,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:30,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:16:30,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:16:30,399 INFO L87 Difference]: Start difference. First operand has 32 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 24 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:30,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:30,459 INFO L93 Difference]: Finished difference Result 50 states and 71 transitions. [2021-05-02 13:16:30,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:16:30,460 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2021-05-02 13:16:30,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:30,464 INFO L225 Difference]: With dead ends: 50 [2021-05-02 13:16:30,464 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:16:30,466 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 59.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:16:30,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:16:30,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-02 13:16:30,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:30,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2021-05-02 13:16:30,488 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 21 [2021-05-02 13:16:30,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:30,489 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2021-05-02 13:16:30,489 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:30,489 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2021-05-02 13:16:30,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:16:30,489 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:30,490 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:30,490 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:16:30,490 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:30,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:30,490 INFO L82 PathProgramCache]: Analyzing trace with hash 677978447, now seen corresponding path program 1 times [2021-05-02 13:16:30,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:30,491 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611007009] [2021-05-02 13:16:30,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:30,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:30,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:30,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:30,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:30,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:30,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:30,611 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:30,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611007009] [2021-05-02 13:16:30,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611007009] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:16:30,611 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:16:30,611 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 13:16:30,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559729779] [2021-05-02 13:16:30,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:16:30,612 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:30,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:16:30,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:16:30,613 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:16:30,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:30,753 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2021-05-02 13:16:30,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:16:30,754 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), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-05-02 13:16:30,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:30,755 INFO L225 Difference]: With dead ends: 46 [2021-05-02 13:16:30,755 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 13:16:30,755 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 74.4ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:16:30,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 13:16:30,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-02 13:16:30,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:30,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-05-02 13:16:30,765 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 21 [2021-05-02 13:16:30,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:30,765 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-05-02 13:16:30,766 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), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:16:30,766 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-05-02 13:16:30,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 13:16:30,766 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:30,766 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:30,766 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:16:30,766 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:30,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:30,767 INFO L82 PathProgramCache]: Analyzing trace with hash -673447056, now seen corresponding path program 1 times [2021-05-02 13:16:30,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:30,767 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563893264] [2021-05-02 13:16:30,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:30,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:30,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:30,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:30,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:30,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:30,871 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:16:30,872 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:30,872 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563893264] [2021-05-02 13:16:30,872 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563893264] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:16:30,872 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:16:30,872 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:16:30,872 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837595863] [2021-05-02 13:16:30,873 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:16:30,873 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:30,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:16:30,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:16:30,874 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:30,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:30,959 INFO L93 Difference]: Finished difference Result 49 states and 65 transitions. [2021-05-02 13:16:30,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:16:30,960 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-05-02 13:16:30,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:30,961 INFO L225 Difference]: With dead ends: 49 [2021-05-02 13:16:30,961 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 13:16:30,962 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.5ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:16:30,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 13:16:30,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2021-05-02 13:16:30,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 22 states have internal predecessors, (28), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:30,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-05-02 13:16:30,968 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2021-05-02 13:16:30,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:30,968 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-05-02 13:16:30,968 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:30,968 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-05-02 13:16:30,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 13:16:30,969 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:30,969 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:30,969 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:16:30,969 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:30,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:30,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1101560306, now seen corresponding path program 1 times [2021-05-02 13:16:30,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:30,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019807248] [2021-05-02 13:16:30,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:30,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:31,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:31,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:31,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:31,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:31,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:16:31,108 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:31,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019807248] [2021-05-02 13:16:31,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019807248] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:16:31,108 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:16:31,108 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:16:31,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115385123] [2021-05-02 13:16:31,109 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:16:31,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:31,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:16:31,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:16:31,109 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:16:31,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:31,230 INFO L93 Difference]: Finished difference Result 57 states and 76 transitions. [2021-05-02 13:16:31,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:16:31,231 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2021-05-02 13:16:31,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:31,232 INFO L225 Difference]: With dead ends: 57 [2021-05-02 13:16:31,232 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 13:16:31,232 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 86.7ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:16:31,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 13:16:31,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-02 13:16:31,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 32 states have internal predecessors, (43), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 13:16:31,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 52 transitions. [2021-05-02 13:16:31,238 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 52 transitions. Word has length 24 [2021-05-02 13:16:31,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:31,238 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 52 transitions. [2021-05-02 13:16:31,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:16:31,238 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 52 transitions. [2021-05-02 13:16:31,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 13:16:31,245 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:31,245 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:31,246 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 13:16:31,246 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:31,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:31,246 INFO L82 PathProgramCache]: Analyzing trace with hash 1103407348, now seen corresponding path program 1 times [2021-05-02 13:16:31,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:31,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80044191] [2021-05-02 13:16:31,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:31,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:31,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:31,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:31,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:31,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:31,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:31,364 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:31,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80044191] [2021-05-02 13:16:31,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80044191] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:31,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937607482] [2021-05-02 13:16:31,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:31,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:31,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:16:31,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:31,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:31,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:31,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:31,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:31,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937607482] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:31,560 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:31,560 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 8 [2021-05-02 13:16:31,561 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105587841] [2021-05-02 13:16:31,561 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:16:31,561 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:31,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:16:31,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:16:31,562 INFO L87 Difference]: Start difference. First operand 40 states and 52 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:31,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:31,687 INFO L93 Difference]: Finished difference Result 79 states and 109 transitions. [2021-05-02 13:16:31,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:16:31,688 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-05-02 13:16:31,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:31,692 INFO L225 Difference]: With dead ends: 79 [2021-05-02 13:16:31,692 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 13:16:31,693 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 91.3ms TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:16:31,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 13:16:31,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 46. [2021-05-02 13:16:31,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 37 states have (on average 1.3783783783783783) internal successors, (51), 38 states have internal predecessors, (51), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 13:16:31,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 60 transitions. [2021-05-02 13:16:31,707 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 60 transitions. Word has length 24 [2021-05-02 13:16:31,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:31,709 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 60 transitions. [2021-05-02 13:16:31,710 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:31,710 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 60 transitions. [2021-05-02 13:16:31,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:16:31,710 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:31,710 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:31,920 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:31,921 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:31,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:31,921 INFO L82 PathProgramCache]: Analyzing trace with hash 1809680179, now seen corresponding path program 2 times [2021-05-02 13:16:31,922 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:31,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413171470] [2021-05-02 13:16:31,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:31,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:31,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:31,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:31,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:31,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:31,996 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:31,996 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:31,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413171470] [2021-05-02 13:16:31,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413171470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:31,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941740943] [2021-05-02 13:16:31,996 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:32,056 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:32,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:32,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:16:32,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:32,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:32,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:32,135 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:16:32,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941740943] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:16:32,136 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:16:32,136 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 10 [2021-05-02 13:16:32,136 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430921060] [2021-05-02 13:16:32,136 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:16:32,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:32,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:16:32,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:16:32,137 INFO L87 Difference]: Start difference. First operand 46 states and 60 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:32,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:32,220 INFO L93 Difference]: Finished difference Result 107 states and 145 transitions. [2021-05-02 13:16:32,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:16:32,222 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 27 [2021-05-02 13:16:32,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:32,225 INFO L225 Difference]: With dead ends: 107 [2021-05-02 13:16:32,226 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 13:16:32,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 69.5ms TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:16:32,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 13:16:32,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 62. [2021-05-02 13:16:32,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 51 states have (on average 1.3725490196078431) internal successors, (70), 52 states have internal predecessors, (70), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:16:32,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 81 transitions. [2021-05-02 13:16:32,238 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 81 transitions. Word has length 27 [2021-05-02 13:16:32,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:32,238 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 81 transitions. [2021-05-02 13:16:32,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:32,238 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 81 transitions. [2021-05-02 13:16:32,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:16:32,239 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:32,239 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:32,457 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:32,457 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:32,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:32,457 INFO L82 PathProgramCache]: Analyzing trace with hash 829847155, now seen corresponding path program 1 times [2021-05-02 13:16:32,458 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:32,458 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338479324] [2021-05-02 13:16:32,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:32,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:32,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:32,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,500 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 13:16:32,500 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:32,500 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338479324] [2021-05-02 13:16:32,500 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1338479324] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:16:32,500 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:16:32,500 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:16:32,500 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489222634] [2021-05-02 13:16:32,501 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:16:32,501 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:32,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:16:32,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:16:32,501 INFO L87 Difference]: Start difference. First operand 62 states and 81 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:32,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:32,550 INFO L93 Difference]: Finished difference Result 134 states and 183 transitions. [2021-05-02 13:16:32,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:16:32,550 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 27 [2021-05-02 13:16:32,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:32,551 INFO L225 Difference]: With dead ends: 134 [2021-05-02 13:16:32,551 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 13:16:32,552 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.6ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:16:32,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 13:16:32,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 73. [2021-05-02 13:16:32,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 62 states have (on average 1.3387096774193548) internal successors, (83), 63 states have internal predecessors, (83), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:16:32,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2021-05-02 13:16:32,557 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 27 [2021-05-02 13:16:32,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:32,557 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2021-05-02 13:16:32,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:32,557 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2021-05-02 13:16:32,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 13:16:32,559 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:32,559 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:32,559 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 13:16:32,559 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:32,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:32,559 INFO L82 PathProgramCache]: Analyzing trace with hash -1699609986, now seen corresponding path program 1 times [2021-05-02 13:16:32,560 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:32,560 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893854084] [2021-05-02 13:16:32,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:32,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:32,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:32,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,607 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:16:32,607 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:32,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893854084] [2021-05-02 13:16:32,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893854084] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:16:32,608 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:16:32,608 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:16:32,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353536836] [2021-05-02 13:16:32,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:16:32,610 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:32,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:16:32,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:16:32,612 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:32,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:32,669 INFO L93 Difference]: Finished difference Result 109 states and 143 transitions. [2021-05-02 13:16:32,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:16:32,669 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 28 [2021-05-02 13:16:32,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:32,670 INFO L225 Difference]: With dead ends: 109 [2021-05-02 13:16:32,671 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 13:16:32,671 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.9ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:16:32,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 13:16:32,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 77. [2021-05-02 13:16:32,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 66 states have (on average 1.3181818181818181) internal successors, (87), 67 states have internal predecessors, (87), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:16:32,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 98 transitions. [2021-05-02 13:16:32,683 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 98 transitions. Word has length 28 [2021-05-02 13:16:32,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:32,683 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 98 transitions. [2021-05-02 13:16:32,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:32,683 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 98 transitions. [2021-05-02 13:16:32,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 13:16:32,684 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:32,684 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:32,684 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 13:16:32,684 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:32,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:32,685 INFO L82 PathProgramCache]: Analyzing trace with hash -1640504642, now seen corresponding path program 1 times [2021-05-02 13:16:32,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:32,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629005417] [2021-05-02 13:16:32,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:32,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:32,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:32,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,755 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:32,755 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:32,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629005417] [2021-05-02 13:16:32,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629005417] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:32,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125573730] [2021-05-02 13:16:32,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:32,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:16:32,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:32,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:32,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:32,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:32,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:32,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:32,895 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:32,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1125573730] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:32,895 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:32,895 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 10 [2021-05-02 13:16:32,895 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490449334] [2021-05-02 13:16:32,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:16:32,896 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:32,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:16:32,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:16:32,896 INFO L87 Difference]: Start difference. First operand 77 states and 98 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:33,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:33,018 INFO L93 Difference]: Finished difference Result 168 states and 225 transitions. [2021-05-02 13:16:33,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:16:33,018 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-05-02 13:16:33,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:33,019 INFO L225 Difference]: With dead ends: 168 [2021-05-02 13:16:33,019 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 13:16:33,022 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 79.4ms TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:16:33,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 13:16:33,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 92. [2021-05-02 13:16:33,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 81 states have (on average 1.3209876543209877) internal successors, (107), 82 states have internal predecessors, (107), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:16:33,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 118 transitions. [2021-05-02 13:16:33,035 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 118 transitions. Word has length 28 [2021-05-02 13:16:33,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:33,036 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 118 transitions. [2021-05-02 13:16:33,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:33,036 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 118 transitions. [2021-05-02 13:16:33,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 13:16:33,036 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:33,036 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:33,252 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:33,252 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:33,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:33,253 INFO L82 PathProgramCache]: Analyzing trace with hash 942246269, now seen corresponding path program 2 times [2021-05-02 13:16:33,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:33,253 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062566957] [2021-05-02 13:16:33,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:33,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:33,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:33,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:33,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:33,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:33,341 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 13:16:33,341 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:33,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062566957] [2021-05-02 13:16:33,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062566957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:33,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294397649] [2021-05-02 13:16:33,341 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 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:33,393 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:33,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:33,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:16:33,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:33,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:33,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:33,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:33,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:33,483 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:16:33,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294397649] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:33,483 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:33,483 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12 [2021-05-02 13:16:33,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013149869] [2021-05-02 13:16:33,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:16:33,484 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:33,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:16:33,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:16:33,485 INFO L87 Difference]: Start difference. First operand 92 states and 118 transitions. Second operand has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 11 states have internal predecessors, (40), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:16:34,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:34,030 INFO L93 Difference]: Finished difference Result 288 states and 390 transitions. [2021-05-02 13:16:34,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 13:16:34,030 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 11 states have internal predecessors, (40), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2021-05-02 13:16:34,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:34,031 INFO L225 Difference]: With dead ends: 288 [2021-05-02 13:16:34,031 INFO L226 Difference]: Without dead ends: 208 [2021-05-02 13:16:34,032 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 364.0ms TimeCoverageRelationStatistics Valid=320, Invalid=940, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:16:34,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-02 13:16:34,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 162. [2021-05-02 13:16:34,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 148 states have (on average 1.2972972972972974) internal successors, (192), 149 states have internal predecessors, (192), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:16:34,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 207 transitions. [2021-05-02 13:16:34,040 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 207 transitions. Word has length 31 [2021-05-02 13:16:34,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:34,041 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 207 transitions. [2021-05-02 13:16:34,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 11 states have internal predecessors, (40), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:16:34,041 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 207 transitions. [2021-05-02 13:16:34,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:16:34,042 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:34,042 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:34,256 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:34,257 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:34,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:34,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1473818596, now seen corresponding path program 1 times [2021-05-02 13:16:34,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:34,258 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445103475] [2021-05-02 13:16:34,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:34,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:34,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:34,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:34,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:34,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:34,336 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:34,336 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:34,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445103475] [2021-05-02 13:16:34,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445103475] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:34,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772128914] [2021-05-02 13:16:34,336 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 13:16:34,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:34,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:16:34,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:34,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:34,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:34,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:34,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:34,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:34,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:34,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:34,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:34,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:34,534 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:34,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772128914] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:34,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:34,534 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2021-05-02 13:16:34,536 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584626341] [2021-05-02 13:16:34,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:16:34,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:34,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:16:34,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:16:34,537 INFO L87 Difference]: Start difference. First operand 162 states and 207 transitions. Second operand has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 13 states have internal predecessors, (46), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:34,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:34,682 INFO L93 Difference]: Finished difference Result 347 states and 451 transitions. [2021-05-02 13:16:34,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:16:34,682 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 13 states have internal predecessors, (46), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 34 [2021-05-02 13:16:34,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:34,683 INFO L225 Difference]: With dead ends: 347 [2021-05-02 13:16:34,683 INFO L226 Difference]: Without dead ends: 197 [2021-05-02 13:16:34,684 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 120.5ms TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:16:34,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-02 13:16:34,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 180. [2021-05-02 13:16:34,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 166 states have (on average 1.2771084337349397) internal successors, (212), 167 states have internal predecessors, (212), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:16:34,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 227 transitions. [2021-05-02 13:16:34,691 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 227 transitions. Word has length 34 [2021-05-02 13:16:34,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:34,691 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 227 transitions. [2021-05-02 13:16:34,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 13 states have internal predecessors, (46), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:34,691 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 227 transitions. [2021-05-02 13:16:34,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 13:16:34,692 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:34,692 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:34,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 13:16:34,908 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:34,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:34,908 INFO L82 PathProgramCache]: Analyzing trace with hash 193637275, now seen corresponding path program 2 times [2021-05-02 13:16:34,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:34,908 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806359069] [2021-05-02 13:16:34,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:34,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:34,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:34,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:34,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:34,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:34,991 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:34,991 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:34,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806359069] [2021-05-02 13:16:34,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [806359069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:34,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1402750638] [2021-05-02 13:16:34,991 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:35,042 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:35,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:35,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:16:35,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:35,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,191 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:35,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1402750638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:35,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:35,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 16 [2021-05-02 13:16:35,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579238037] [2021-05-02 13:16:35,193 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:16:35,193 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:35,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:16:35,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=148, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:16:35,194 INFO L87 Difference]: Start difference. First operand 180 states and 227 transitions. Second operand has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:35,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:35,365 INFO L93 Difference]: Finished difference Result 390 states and 503 transitions. [2021-05-02 13:16:35,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:16:35,365 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2021-05-02 13:16:35,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:35,366 INFO L225 Difference]: With dead ends: 390 [2021-05-02 13:16:35,367 INFO L226 Difference]: Without dead ends: 222 [2021-05-02 13:16:35,367 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 121.3ms TimeCoverageRelationStatistics Valid=96, Invalid=176, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:16:35,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-02 13:16:35,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 201. [2021-05-02 13:16:35,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 187 states have (on average 1.2727272727272727) internal successors, (238), 188 states have internal predecessors, (238), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:16:35,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 253 transitions. [2021-05-02 13:16:35,375 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 253 transitions. Word has length 37 [2021-05-02 13:16:35,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:35,375 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 253 transitions. [2021-05-02 13:16:35,375 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:35,375 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 253 transitions. [2021-05-02 13:16:35,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:16:35,376 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:35,376 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:35,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:35,584 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:35,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:35,584 INFO L82 PathProgramCache]: Analyzing trace with hash -220255300, now seen corresponding path program 3 times [2021-05-02 13:16:35,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:35,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311770434] [2021-05-02 13:16:35,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:35,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:35,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:35,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:35,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:35,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:35,686 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:35,686 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:35,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311770434] [2021-05-02 13:16:35,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1311770434] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:35,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1769744225] [2021-05-02 13:16:35,687 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:35,734 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:16:35,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:35,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:16:35,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:35,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,818 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:16:35,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1769744225] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:16:35,818 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:16:35,818 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [11] total 15 [2021-05-02 13:16:35,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17748084] [2021-05-02 13:16:35,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:16:35,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:35,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:16:35,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:16:35,819 INFO L87 Difference]: Start difference. First operand 201 states and 253 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:35,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:35,875 INFO L93 Difference]: Finished difference Result 292 states and 364 transitions. [2021-05-02 13:16:35,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:16:35,877 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 40 [2021-05-02 13:16:35,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:35,878 INFO L225 Difference]: With dead ends: 292 [2021-05-02 13:16:35,878 INFO L226 Difference]: Without dead ends: 196 [2021-05-02 13:16:35,878 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 93.3ms TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:16:35,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-02 13:16:35,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2021-05-02 13:16:35,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 181 states have (on average 1.2541436464088398) internal successors, (227), 182 states have internal predecessors, (227), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:16:35,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 242 transitions. [2021-05-02 13:16:35,886 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 242 transitions. Word has length 40 [2021-05-02 13:16:35,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:35,887 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 242 transitions. [2021-05-02 13:16:35,887 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:35,887 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 242 transitions. [2021-05-02 13:16:35,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:16:35,888 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:35,888 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:36,100 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:36,101 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:36,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:36,101 INFO L82 PathProgramCache]: Analyzing trace with hash -158215686, now seen corresponding path program 1 times [2021-05-02 13:16:36,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:36,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190019679] [2021-05-02 13:16:36,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:36,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:36,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:36,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:36,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:36,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:36,177 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:36,177 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:36,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190019679] [2021-05-02 13:16:36,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190019679] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:36,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2040575597] [2021-05-02 13:16:36,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:36,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:36,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 13:16:36,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:36,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,385 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:36,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2040575597] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:36,385 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:36,385 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 18 [2021-05-02 13:16:36,385 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099060773] [2021-05-02 13:16:36,386 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:16:36,386 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:36,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:16:36,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=189, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:16:36,386 INFO L87 Difference]: Start difference. First operand 195 states and 242 transitions. Second operand has 18 states, 18 states have (on average 3.2222222222222223) internal successors, (58), 17 states have internal predecessors, (58), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:36,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:36,562 INFO L93 Difference]: Finished difference Result 420 states and 533 transitions. [2021-05-02 13:16:36,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:16:36,562 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.2222222222222223) internal successors, (58), 17 states have internal predecessors, (58), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 40 [2021-05-02 13:16:36,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:36,563 INFO L225 Difference]: With dead ends: 420 [2021-05-02 13:16:36,563 INFO L226 Difference]: Without dead ends: 237 [2021-05-02 13:16:36,564 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 134.7ms TimeCoverageRelationStatistics Valid=121, Invalid=221, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:16:36,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-05-02 13:16:36,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 216. [2021-05-02 13:16:36,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 202 states have (on average 1.2524752475247525) internal successors, (253), 203 states have internal predecessors, (253), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:16:36,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 268 transitions. [2021-05-02 13:16:36,573 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 268 transitions. Word has length 40 [2021-05-02 13:16:36,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:36,573 INFO L480 AbstractCegarLoop]: Abstraction has 216 states and 268 transitions. [2021-05-02 13:16:36,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.2222222222222223) internal successors, (58), 17 states have internal predecessors, (58), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:36,574 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 268 transitions. [2021-05-02 13:16:36,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:16:36,574 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:36,574 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:36,777 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 13:16:36,777 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:36,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:36,778 INFO L82 PathProgramCache]: Analyzing trace with hash 1743353085, now seen corresponding path program 2 times [2021-05-02 13:16:36,778 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:36,778 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171581000] [2021-05-02 13:16:36,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:36,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:36,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:36,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:36,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:36,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:36,879 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:36,879 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:36,879 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171581000] [2021-05-02 13:16:36,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [171581000] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:36,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672258365] [2021-05-02 13:16:36,880 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 13:16:36,934 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:36,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:36,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:16:36,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:36,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,087 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:37,087 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1672258365] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:37,088 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:37,088 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 20 [2021-05-02 13:16:37,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336040159] [2021-05-02 13:16:37,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 13:16:37,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:37,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 13:16:37,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=235, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:16:37,090 INFO L87 Difference]: Start difference. First operand 216 states and 268 transitions. Second operand has 20 states, 20 states have (on average 3.2) internal successors, (64), 19 states have internal predecessors, (64), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:37,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:37,274 INFO L93 Difference]: Finished difference Result 462 states and 585 transitions. [2021-05-02 13:16:37,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:16:37,275 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.2) internal successors, (64), 19 states have internal predecessors, (64), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2021-05-02 13:16:37,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:37,276 INFO L225 Difference]: With dead ends: 462 [2021-05-02 13:16:37,276 INFO L226 Difference]: Without dead ends: 258 [2021-05-02 13:16:37,278 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 147.7ms TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:16:37,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2021-05-02 13:16:37,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 237. [2021-05-02 13:16:37,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 223 states have (on average 1.251121076233184) internal successors, (279), 224 states have internal predecessors, (279), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:16:37,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 294 transitions. [2021-05-02 13:16:37,287 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 294 transitions. Word has length 43 [2021-05-02 13:16:37,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:37,288 INFO L480 AbstractCegarLoop]: Abstraction has 237 states and 294 transitions. [2021-05-02 13:16:37,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.2) internal successors, (64), 19 states have internal predecessors, (64), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:37,288 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 294 transitions. [2021-05-02 13:16:37,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 13:16:37,288 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:37,288 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:37,492 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:16:37,493 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:37,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:37,493 INFO L82 PathProgramCache]: Analyzing trace with hash 759975706, now seen corresponding path program 3 times [2021-05-02 13:16:37,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:37,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677114998] [2021-05-02 13:16:37,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:37,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:37,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:37,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:37,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:37,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:37,597 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:37,597 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:37,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677114998] [2021-05-02 13:16:37,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [677114998] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:37,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979257539] [2021-05-02 13:16:37,597 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:37,651 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:16:37,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:37,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:16:37,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:37,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:37,811 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 13:16:37,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979257539] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:16:37,812 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:16:37,812 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [13] total 20 [2021-05-02 13:16:37,812 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600309445] [2021-05-02 13:16:37,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:16:37,813 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:37,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:16:37,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:16:37,813 INFO L87 Difference]: Start difference. First operand 237 states and 294 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:37,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:37,886 INFO L93 Difference]: Finished difference Result 320 states and 393 transitions. [2021-05-02 13:16:37,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:16:37,886 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 46 [2021-05-02 13:16:37,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:37,887 INFO L225 Difference]: With dead ends: 320 [2021-05-02 13:16:37,887 INFO L226 Difference]: Without dead ends: 318 [2021-05-02 13:16:37,888 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 144.2ms TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:16:37,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-05-02 13:16:37,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 314. [2021-05-02 13:16:37,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 314 states, 293 states have (on average 1.235494880546075) internal successors, (362), 297 states have internal predecessors, (362), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (11), 7 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:16:37,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 385 transitions. [2021-05-02 13:16:37,901 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 385 transitions. Word has length 46 [2021-05-02 13:16:37,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:37,901 INFO L480 AbstractCegarLoop]: Abstraction has 314 states and 385 transitions. [2021-05-02 13:16:37,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:37,901 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 385 transitions. [2021-05-02 13:16:37,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 13:16:37,902 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:37,902 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:38,116 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 13:16:38,117 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:38,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:38,117 INFO L82 PathProgramCache]: Analyzing trace with hash 2089980700, now seen corresponding path program 1 times [2021-05-02 13:16:38,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:38,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104721824] [2021-05-02 13:16:38,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:38,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:38,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:38,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:38,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:38,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:38,240 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:38,240 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:38,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104721824] [2021-05-02 13:16:38,240 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2104721824] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:38,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627709203] [2021-05-02 13:16:38,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:38,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:38,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 13:16:38,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:38,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:38,459 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:38,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627709203] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:38,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:38,459 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-05-02 13:16:38,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416695765] [2021-05-02 13:16:38,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 13:16:38,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:38,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 13:16:38,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=345, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:16:38,461 INFO L87 Difference]: Start difference. First operand 314 states and 385 transitions. Second operand has 23 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 22 states have internal predecessors, (71), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:38,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:38,996 INFO L93 Difference]: Finished difference Result 724 states and 907 transitions. [2021-05-02 13:16:38,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:16:38,997 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 22 states have internal predecessors, (71), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2021-05-02 13:16:38,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:39,000 INFO L225 Difference]: With dead ends: 724 [2021-05-02 13:16:39,000 INFO L226 Difference]: Without dead ends: 470 [2021-05-02 13:16:39,001 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 424.7ms TimeCoverageRelationStatistics Valid=431, Invalid=1209, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:16:39,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2021-05-02 13:16:39,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 427. [2021-05-02 13:16:39,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 427 states, 401 states have (on average 1.2394014962593516) internal successors, (497), 406 states have internal predecessors, (497), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 13:16:39,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 427 states to 427 states and 526 transitions. [2021-05-02 13:16:39,016 INFO L78 Accepts]: Start accepts. Automaton has 427 states and 526 transitions. Word has length 46 [2021-05-02 13:16:39,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:39,016 INFO L480 AbstractCegarLoop]: Abstraction has 427 states and 526 transitions. [2021-05-02 13:16:39,017 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 22 states have internal predecessors, (71), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:39,017 INFO L276 IsEmpty]: Start isEmpty. Operand 427 states and 526 transitions. [2021-05-02 13:16:39,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 13:16:39,017 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:39,017 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:39,224 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 13:16:39,224 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:39,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:39,225 INFO L82 PathProgramCache]: Analyzing trace with hash -1753798755, now seen corresponding path program 2 times [2021-05-02 13:16:39,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:39,225 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476730165] [2021-05-02 13:16:39,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:39,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:39,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:39,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:39,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:39,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:39,328 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:39,328 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:39,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476730165] [2021-05-02 13:16:39,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476730165] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:39,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291481843] [2021-05-02 13:16:39,329 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:39,374 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:39,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:39,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 13:16:39,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:39,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,591 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:39,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1291481843] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:39,592 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:39,592 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 26 [2021-05-02 13:16:39,592 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067613196] [2021-05-02 13:16:39,592 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:16:39,592 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:39,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:16:39,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=463, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:16:39,593 INFO L87 Difference]: Start difference. First operand 427 states and 526 transitions. Second operand has 26 states, 26 states have (on average 2.9615384615384617) internal successors, (77), 25 states have internal predecessors, (77), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:39,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:39,964 INFO L93 Difference]: Finished difference Result 908 states and 1135 transitions. [2021-05-02 13:16:39,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:16:39,969 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.9615384615384617) internal successors, (77), 25 states have internal predecessors, (77), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 49 [2021-05-02 13:16:39,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:39,974 INFO L225 Difference]: With dead ends: 908 [2021-05-02 13:16:39,974 INFO L226 Difference]: Without dead ends: 626 [2021-05-02 13:16:39,975 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 329.5ms TimeCoverageRelationStatistics Valid=376, Invalid=1030, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:16:39,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 626 states. [2021-05-02 13:16:39,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 626 to 433. [2021-05-02 13:16:39,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 407 states have (on average 1.2506142506142506) internal successors, (509), 412 states have internal predecessors, (509), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 13:16:39,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 538 transitions. [2021-05-02 13:16:39,992 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 538 transitions. Word has length 49 [2021-05-02 13:16:39,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:39,993 INFO L480 AbstractCegarLoop]: Abstraction has 433 states and 538 transitions. [2021-05-02 13:16:39,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.9615384615384617) internal successors, (77), 25 states have internal predecessors, (77), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:39,993 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 538 transitions. [2021-05-02 13:16:39,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 13:16:39,993 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:39,993 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:40,208 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:40,209 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:40,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:40,209 INFO L82 PathProgramCache]: Analyzing trace with hash -1921186147, now seen corresponding path program 1 times [2021-05-02 13:16:40,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:40,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941530183] [2021-05-02 13:16:40,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:40,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:40,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:40,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:40,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:40,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:40,254 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-05-02 13:16:40,254 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:40,254 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941530183] [2021-05-02 13:16:40,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941530183] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:16:40,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:16:40,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:16:40,255 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718675574] [2021-05-02 13:16:40,255 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:16:40,255 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:40,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:16:40,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:16:40,255 INFO L87 Difference]: Start difference. First operand 433 states and 538 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:16:40,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:40,354 INFO L93 Difference]: Finished difference Result 719 states and 903 transitions. [2021-05-02 13:16:40,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:16:40,355 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-02 13:16:40,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:40,357 INFO L225 Difference]: With dead ends: 719 [2021-05-02 13:16:40,357 INFO L226 Difference]: Without dead ends: 569 [2021-05-02 13:16:40,357 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 46.0ms TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:16:40,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 569 states. [2021-05-02 13:16:40,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 569 to 514. [2021-05-02 13:16:40,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 514 states, 486 states have (on average 1.2592592592592593) internal successors, (612), 491 states have internal predecessors, (612), 17 states have call successors, (17), 11 states have call predecessors, (17), 10 states have return successors, (16), 11 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 13:16:40,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 645 transitions. [2021-05-02 13:16:40,375 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 645 transitions. Word has length 49 [2021-05-02 13:16:40,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:40,375 INFO L480 AbstractCegarLoop]: Abstraction has 514 states and 645 transitions. [2021-05-02 13:16:40,375 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:16:40,375 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 645 transitions. [2021-05-02 13:16:40,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 13:16:40,375 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:40,375 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:40,376 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-02 13:16:40,376 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:40,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:40,376 INFO L82 PathProgramCache]: Analyzing trace with hash 630503292, now seen corresponding path program 3 times [2021-05-02 13:16:40,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:40,376 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74979009] [2021-05-02 13:16:40,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:40,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:40,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:40,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:40,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:40,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:40,530 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:40,530 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:40,530 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74979009] [2021-05-02 13:16:40,530 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74979009] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:40,530 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [565747696] [2021-05-02 13:16:40,530 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 13:16:40,567 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:16:40,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:40,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 13:16:40,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:40,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:40,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:40,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:40,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:40,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:40,735 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-05-02 13:16:40,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [565747696] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:16:40,735 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:16:40,735 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [16] total 23 [2021-05-02 13:16:40,735 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052530105] [2021-05-02 13:16:40,736 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:16:40,736 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:40,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:16:40,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:16:40,737 INFO L87 Difference]: Start difference. First operand 514 states and 645 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:40,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:40,827 INFO L93 Difference]: Finished difference Result 525 states and 656 transitions. [2021-05-02 13:16:40,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:16:40,828 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 52 [2021-05-02 13:16:40,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:40,831 INFO L225 Difference]: With dead ends: 525 [2021-05-02 13:16:40,831 INFO L226 Difference]: Without dead ends: 523 [2021-05-02 13:16:40,831 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 226.1ms TimeCoverageRelationStatistics Valid=102, Invalid=498, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:16:40,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2021-05-02 13:16:40,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 522. [2021-05-02 13:16:40,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 522 states, 492 states have (on average 1.2560975609756098) internal successors, (618), 498 states have internal predecessors, (618), 18 states have call successors, (18), 12 states have call predecessors, (18), 11 states have return successors, (17), 11 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-02 13:16:40,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 522 states to 522 states and 653 transitions. [2021-05-02 13:16:40,849 INFO L78 Accepts]: Start accepts. Automaton has 522 states and 653 transitions. Word has length 52 [2021-05-02 13:16:40,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:40,849 INFO L480 AbstractCegarLoop]: Abstraction has 522 states and 653 transitions. [2021-05-02 13:16:40,849 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 13:16:40,849 INFO L276 IsEmpty]: Start isEmpty. Operand 522 states and 653 transitions. [2021-05-02 13:16:40,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 13:16:40,850 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:40,850 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:41,064 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 13:16:41,065 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:41,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:41,065 INFO L82 PathProgramCache]: Analyzing trace with hash -1644049929, now seen corresponding path program 1 times [2021-05-02 13:16:41,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:41,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952297118] [2021-05-02 13:16:41,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:41,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:41,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:41,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:41,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:41,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:41,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-02 13:16:41,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:41,168 INFO L134 CoverageAnalysis]: Checked inductivity of 504 backedges. 265 proven. 117 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2021-05-02 13:16:41,168 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:41,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952297118] [2021-05-02 13:16:41,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952297118] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:41,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657590552] [2021-05-02 13:16:41,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:41,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:41,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 13:16:41,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:41,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:41,475 INFO L134 CoverageAnalysis]: Checked inductivity of 504 backedges. 263 proven. 117 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2021-05-02 13:16:41,475 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1657590552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:41,476 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:41,476 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-05-02 13:16:41,476 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129344603] [2021-05-02 13:16:41,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:16:41,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:41,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:16:41,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=342, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:16:41,477 INFO L87 Difference]: Start difference. First operand 522 states and 653 transitions. Second operand has 24 states, 24 states have (on average 3.625) internal successors, (87), 23 states have internal predecessors, (87), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:16:41,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:41,628 INFO L93 Difference]: Finished difference Result 1020 states and 1290 transitions. [2021-05-02 13:16:41,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:16:41,629 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.625) internal successors, (87), 23 states have internal predecessors, (87), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 87 [2021-05-02 13:16:41,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:41,631 INFO L225 Difference]: With dead ends: 1020 [2021-05-02 13:16:41,631 INFO L226 Difference]: Without dead ends: 590 [2021-05-02 13:16:41,632 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 204.4ms TimeCoverageRelationStatistics Valid=214, Invalid=386, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:16:41,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2021-05-02 13:16:41,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 553. [2021-05-02 13:16:41,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 523 states have (on average 1.2447418738049714) internal successors, (651), 529 states have internal predecessors, (651), 18 states have call successors, (18), 12 states have call predecessors, (18), 11 states have return successors, (17), 11 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-02 13:16:41,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 686 transitions. [2021-05-02 13:16:41,653 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 686 transitions. Word has length 87 [2021-05-02 13:16:41,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:41,653 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 686 transitions. [2021-05-02 13:16:41,653 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.625) internal successors, (87), 23 states have internal predecessors, (87), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:16:41,653 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 686 transitions. [2021-05-02 13:16:41,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 13:16:41,654 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:41,654 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:41,872 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:41,873 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:41,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:41,873 INFO L82 PathProgramCache]: Analyzing trace with hash -218145757, now seen corresponding path program 2 times [2021-05-02 13:16:41,873 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:41,873 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862697809] [2021-05-02 13:16:41,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:41,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:41,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:41,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:41,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:41,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:42,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-02 13:16:42,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:42,001 INFO L134 CoverageAnalysis]: Checked inductivity of 619 backedges. 324 proven. 145 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2021-05-02 13:16:42,001 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:42,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862697809] [2021-05-02 13:16:42,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [862697809] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:42,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1626698609] [2021-05-02 13:16:42,001 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:42,058 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:42,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:42,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 13:16:42,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:42,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:42,302 INFO L134 CoverageAnalysis]: Checked inductivity of 619 backedges. 322 proven. 145 refuted. 0 times theorem prover too weak. 152 trivial. 0 not checked. [2021-05-02 13:16:42,302 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1626698609] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:42,302 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:42,302 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 26 [2021-05-02 13:16:42,302 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813435222] [2021-05-02 13:16:42,303 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:16:42,303 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:42,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:16:42,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=403, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:16:42,304 INFO L87 Difference]: Start difference. First operand 553 states and 686 transitions. Second operand has 26 states, 26 states have (on average 3.576923076923077) internal successors, (93), 25 states have internal predecessors, (93), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:16:42,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:42,535 INFO L93 Difference]: Finished difference Result 1117 states and 1408 transitions. [2021-05-02 13:16:42,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 13:16:42,536 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.576923076923077) internal successors, (93), 25 states have internal predecessors, (93), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 93 [2021-05-02 13:16:42,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:42,538 INFO L225 Difference]: With dead ends: 1117 [2021-05-02 13:16:42,538 INFO L226 Difference]: Without dead ends: 648 [2021-05-02 13:16:42,540 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 225.4ms TimeCoverageRelationStatistics Valid=251, Invalid=451, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:16:42,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 648 states. [2021-05-02 13:16:42,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 648 to 600. [2021-05-02 13:16:42,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 600 states, 570 states have (on average 1.2421052631578948) internal successors, (708), 576 states have internal predecessors, (708), 18 states have call successors, (18), 12 states have call predecessors, (18), 11 states have return successors, (17), 11 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-02 13:16:42,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 743 transitions. [2021-05-02 13:16:42,563 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 743 transitions. Word has length 93 [2021-05-02 13:16:42,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:42,563 INFO L480 AbstractCegarLoop]: Abstraction has 600 states and 743 transitions. [2021-05-02 13:16:42,563 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 3.576923076923077) internal successors, (93), 25 states have internal predecessors, (93), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:16:42,563 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 743 transitions. [2021-05-02 13:16:42,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 13:16:42,564 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:42,564 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 20, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:42,775 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 13:16:42,775 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:42,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:42,776 INFO L82 PathProgramCache]: Analyzing trace with hash -369554377, now seen corresponding path program 3 times [2021-05-02 13:16:42,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:42,776 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037262226] [2021-05-02 13:16:42,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:42,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:42,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:42,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:42,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:42,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:42,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-02 13:16:42,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:42,911 INFO L134 CoverageAnalysis]: Checked inductivity of 746 backedges. 389 proven. 176 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2021-05-02 13:16:42,911 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:42,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037262226] [2021-05-02 13:16:42,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037262226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:42,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1606127835] [2021-05-02 13:16:42,911 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:42,955 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:16:42,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:42,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 13:16:42,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:43,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:43,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:43,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:43,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:43,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:43,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:43,238 INFO L134 CoverageAnalysis]: Checked inductivity of 746 backedges. 33 proven. 392 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2021-05-02 13:16:43,238 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1606127835] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:43,238 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:43,238 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10] total 24 [2021-05-02 13:16:43,238 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153452992] [2021-05-02 13:16:43,238 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:16:43,239 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:43,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:16:43,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:16:43,239 INFO L87 Difference]: Start difference. First operand 600 states and 743 transitions. Second operand has 24 states, 24 states have (on average 3.625) internal successors, (87), 22 states have internal predecessors, (87), 5 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:16:44,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:44,549 INFO L93 Difference]: Finished difference Result 1556 states and 1968 transitions. [2021-05-02 13:16:44,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 13:16:44,550 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.625) internal successors, (87), 22 states have internal predecessors, (87), 5 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 99 [2021-05-02 13:16:44,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:44,553 INFO L225 Difference]: With dead ends: 1556 [2021-05-02 13:16:44,553 INFO L226 Difference]: Without dead ends: 1039 [2021-05-02 13:16:44,555 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1166 ImplicationChecksByTransitivity, 1009.4ms TimeCoverageRelationStatistics Valid=944, Invalid=3612, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 13:16:44,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1039 states. [2021-05-02 13:16:44,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1039 to 972. [2021-05-02 13:16:44,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 972 states, 931 states have (on average 1.2406015037593985) internal successors, (1155), 939 states have internal predecessors, (1155), 25 states have call successors, (25), 16 states have call predecessors, (25), 15 states have return successors, (24), 16 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:16:44,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 972 states to 972 states and 1204 transitions. [2021-05-02 13:16:44,586 INFO L78 Accepts]: Start accepts. Automaton has 972 states and 1204 transitions. Word has length 99 [2021-05-02 13:16:44,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:44,586 INFO L480 AbstractCegarLoop]: Abstraction has 972 states and 1204 transitions. [2021-05-02 13:16:44,586 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.625) internal successors, (87), 22 states have internal predecessors, (87), 5 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:16:44,586 INFO L276 IsEmpty]: Start isEmpty. Operand 972 states and 1204 transitions. [2021-05-02 13:16:44,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 13:16:44,587 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:44,587 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 12, 12, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:44,801 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:44,801 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:44,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:44,801 INFO L82 PathProgramCache]: Analyzing trace with hash 1533593249, now seen corresponding path program 1 times [2021-05-02 13:16:44,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:44,801 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557300746] [2021-05-02 13:16:44,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:44,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:44,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:44,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:44,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:44,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:44,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-02 13:16:44,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:44,974 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 44 proven. 630 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2021-05-02 13:16:44,974 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:44,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557300746] [2021-05-02 13:16:44,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557300746] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:44,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637199337] [2021-05-02 13:16:44,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:45,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:45,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 13:16:45,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:45,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,295 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 458 proven. 210 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2021-05-02 13:16:45,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637199337] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:45,295 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:45,295 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 30 [2021-05-02 13:16:45,296 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920206164] [2021-05-02 13:16:45,296 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 13:16:45,296 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:45,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 13:16:45,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=540, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:16:45,297 INFO L87 Difference]: Start difference. First operand 972 states and 1204 transitions. Second operand has 30 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 29 states have internal predecessors, (116), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:16:45,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:45,541 INFO L93 Difference]: Finished difference Result 1973 states and 2466 transitions. [2021-05-02 13:16:45,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 13:16:45,542 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 29 states have internal predecessors, (116), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 105 [2021-05-02 13:16:45,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:45,544 INFO L225 Difference]: With dead ends: 1973 [2021-05-02 13:16:45,544 INFO L226 Difference]: Without dead ends: 1093 [2021-05-02 13:16:45,546 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 335 ImplicationChecksByTransitivity, 281.5ms TimeCoverageRelationStatistics Valid=334, Invalid=596, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:16:45,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1093 states. [2021-05-02 13:16:45,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1093 to 1023. [2021-05-02 13:16:45,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1023 states, 982 states have (on average 1.2382892057026476) internal successors, (1216), 990 states have internal predecessors, (1216), 25 states have call successors, (25), 16 states have call predecessors, (25), 15 states have return successors, (24), 16 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:16:45,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1023 states to 1023 states and 1265 transitions. [2021-05-02 13:16:45,587 INFO L78 Accepts]: Start accepts. Automaton has 1023 states and 1265 transitions. Word has length 105 [2021-05-02 13:16:45,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:45,588 INFO L480 AbstractCegarLoop]: Abstraction has 1023 states and 1265 transitions. [2021-05-02 13:16:45,588 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 29 states have internal predecessors, (116), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:16:45,588 INFO L276 IsEmpty]: Start isEmpty. Operand 1023 states and 1265 transitions. [2021-05-02 13:16:45,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-02 13:16:45,589 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:45,590 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 13, 13, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:45,805 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 13:16:45,805 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:45,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:45,805 INFO L82 PathProgramCache]: Analyzing trace with hash 1379214263, now seen corresponding path program 2 times [2021-05-02 13:16:45,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:45,806 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607263754] [2021-05-02 13:16:45,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:45,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:45,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:45,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:46,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:46,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:46,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-02 13:16:46,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:46,006 INFO L134 CoverageAnalysis]: Checked inductivity of 1036 backedges. 47 proven. 741 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2021-05-02 13:16:46,006 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:46,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607263754] [2021-05-02 13:16:46,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607263754] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:46,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113357480] [2021-05-02 13:16:46,006 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:46,097 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:46,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:46,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:16:46,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:46,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:46,439 INFO L134 CoverageAnalysis]: Checked inductivity of 1036 backedges. 535 proven. 247 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2021-05-02 13:16:46,440 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113357480] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:46,440 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:46,440 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 32 [2021-05-02 13:16:46,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606311486] [2021-05-02 13:16:46,440 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 13:16:46,440 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:46,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 13:16:46,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=616, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:16:46,441 INFO L87 Difference]: Start difference. First operand 1023 states and 1265 transitions. Second operand has 32 states, 32 states have (on average 3.8125) internal successors, (122), 31 states have internal predecessors, (122), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:16:46,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:46,762 INFO L93 Difference]: Finished difference Result 2094 states and 2620 transitions. [2021-05-02 13:16:46,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:16:46,762 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.8125) internal successors, (122), 31 states have internal predecessors, (122), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 111 [2021-05-02 13:16:46,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:46,765 INFO L225 Difference]: With dead ends: 2094 [2021-05-02 13:16:46,765 INFO L226 Difference]: Without dead ends: 1172 [2021-05-02 13:16:46,767 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 326.9ms TimeCoverageRelationStatistics Valid=380, Invalid=676, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:16:46,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1172 states. [2021-05-02 13:16:46,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1172 to 1098. [2021-05-02 13:16:46,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1098 states, 1057 states have (on average 1.2355723746452223) internal successors, (1306), 1065 states have internal predecessors, (1306), 25 states have call successors, (25), 16 states have call predecessors, (25), 15 states have return successors, (24), 16 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:16:46,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1098 states to 1098 states and 1355 transitions. [2021-05-02 13:16:46,797 INFO L78 Accepts]: Start accepts. Automaton has 1098 states and 1355 transitions. Word has length 111 [2021-05-02 13:16:46,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:46,797 INFO L480 AbstractCegarLoop]: Abstraction has 1098 states and 1355 transitions. [2021-05-02 13:16:46,797 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 3.8125) internal successors, (122), 31 states have internal predecessors, (122), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:16:46,797 INFO L276 IsEmpty]: Start isEmpty. Operand 1098 states and 1355 transitions. [2021-05-02 13:16:46,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-02 13:16:46,798 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:46,799 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 14, 14, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:47,012 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 13:16:47,013 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:47,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:47,013 INFO L82 PathProgramCache]: Analyzing trace with hash 344085025, now seen corresponding path program 3 times [2021-05-02 13:16:47,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:47,013 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436368948] [2021-05-02 13:16:47,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:47,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:47,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:47,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:47,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:47,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:47,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-05-02 13:16:47,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:47,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1199 backedges. 50 proven. 861 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-05-02 13:16:47,188 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:47,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436368948] [2021-05-02 13:16:47,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436368948] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:47,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414410615] [2021-05-02 13:16:47,188 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:47,237 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:16:47,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:47,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 13:16:47,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:47,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:47,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:47,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:47,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:47,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:47,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1199 backedges. 42 proven. 623 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2021-05-02 13:16:47,535 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414410615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:47,535 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:47,535 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10] total 27 [2021-05-02 13:16:47,536 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037041092] [2021-05-02 13:16:47,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 13:16:47,536 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:47,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 13:16:47,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=540, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:16:47,537 INFO L87 Difference]: Start difference. First operand 1098 states and 1355 transitions. Second operand has 27 states, 27 states have (on average 3.7037037037037037) internal successors, (100), 25 states have internal predecessors, (100), 5 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 13:16:48,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:48,856 INFO L93 Difference]: Finished difference Result 2391 states and 2979 transitions. [2021-05-02 13:16:48,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 13:16:48,856 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.7037037037037037) internal successors, (100), 25 states have internal predecessors, (100), 5 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 117 [2021-05-02 13:16:48,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:48,859 INFO L225 Difference]: With dead ends: 2391 [2021-05-02 13:16:48,859 INFO L226 Difference]: Without dead ends: 1403 [2021-05-02 13:16:48,862 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1726 ImplicationChecksByTransitivity, 1228.6ms TimeCoverageRelationStatistics Valid=1364, Invalid=4956, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 13:16:48,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1403 states. [2021-05-02 13:16:48,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1403 to 1271. [2021-05-02 13:16:48,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1271 states, 1225 states have (on average 1.2318367346938774) internal successors, (1509), 1235 states have internal predecessors, (1509), 28 states have call successors, (28), 18 states have call predecessors, (28), 17 states have return successors, (27), 17 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 13:16:48,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1271 states to 1271 states and 1564 transitions. [2021-05-02 13:16:48,895 INFO L78 Accepts]: Start accepts. Automaton has 1271 states and 1564 transitions. Word has length 117 [2021-05-02 13:16:48,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:48,896 INFO L480 AbstractCegarLoop]: Abstraction has 1271 states and 1564 transitions. [2021-05-02 13:16:48,896 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.7037037037037037) internal successors, (100), 25 states have internal predecessors, (100), 5 states have call successors, (10), 5 states have call predecessors, (10), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 13:16:48,896 INFO L276 IsEmpty]: Start isEmpty. Operand 1271 states and 1564 transitions. [2021-05-02 13:16:48,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 13:16:48,897 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:48,897 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 28, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:49,113 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 13:16:49,113 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:49,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:49,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1102713973, now seen corresponding path program 4 times [2021-05-02 13:16:49,114 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:49,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796884084] [2021-05-02 13:16:49,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:49,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:49,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:49,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:49,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:49,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:49,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-05-02 13:16:49,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:49,293 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 709 proven. 330 refuted. 0 times theorem prover too weak. 335 trivial. 0 not checked. [2021-05-02 13:16:49,293 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:49,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796884084] [2021-05-02 13:16:49,294 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796884084] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:49,294 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326725369] [2021-05-02 13:16:49,294 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:49,363 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:16:49,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:49,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 13:16:49,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:49,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:49,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:50,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 287 proven. 1087 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:50,535 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326725369] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:50,535 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:50,535 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 41] total 59 [2021-05-02 13:16:50,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212533336] [2021-05-02 13:16:50,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 13:16:50,536 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:50,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 13:16:50,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=517, Invalid=2905, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:16:50,537 INFO L87 Difference]: Start difference. First operand 1271 states and 1564 transitions. Second operand has 59 states, 59 states have (on average 3.0847457627118646) internal successors, (182), 57 states have internal predecessors, (182), 5 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:16:52,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:52,585 INFO L93 Difference]: Finished difference Result 2621 states and 3249 transitions. [2021-05-02 13:16:52,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 13:16:52,586 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.0847457627118646) internal successors, (182), 57 states have internal predecessors, (182), 5 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 123 [2021-05-02 13:16:52,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:52,589 INFO L225 Difference]: With dead ends: 2621 [2021-05-02 13:16:52,589 INFO L226 Difference]: Without dead ends: 1469 [2021-05-02 13:16:52,593 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3591 ImplicationChecksByTransitivity, 2094.2ms TimeCoverageRelationStatistics Valid=1976, Invalid=9796, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 13:16:52,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1469 states. [2021-05-02 13:16:52,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1469 to 1343. [2021-05-02 13:16:52,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1343 states, 1297 states have (on average 1.2305319969159598) internal successors, (1596), 1307 states have internal predecessors, (1596), 28 states have call successors, (28), 18 states have call predecessors, (28), 17 states have return successors, (27), 17 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 13:16:52,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1343 states to 1343 states and 1651 transitions. [2021-05-02 13:16:52,633 INFO L78 Accepts]: Start accepts. Automaton has 1343 states and 1651 transitions. Word has length 123 [2021-05-02 13:16:52,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:52,633 INFO L480 AbstractCegarLoop]: Abstraction has 1343 states and 1651 transitions. [2021-05-02 13:16:52,633 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 3.0847457627118646) internal successors, (182), 57 states have internal predecessors, (182), 5 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:16:52,633 INFO L276 IsEmpty]: Start isEmpty. Operand 1343 states and 1651 transitions. [2021-05-02 13:16:52,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-02 13:16:52,635 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:52,635 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 30, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:52,848 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 13:16:52,849 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:52,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:52,849 INFO L82 PathProgramCache]: Analyzing trace with hash -436572509, now seen corresponding path program 1 times [2021-05-02 13:16:52,849 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:52,849 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410909161] [2021-05-02 13:16:52,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:52,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:53,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:53,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:53,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:53,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:53,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2021-05-02 13:16:53,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:53,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1561 backedges. 805 proven. 376 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-05-02 13:16:53,071 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:53,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410909161] [2021-05-02 13:16:53,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [410909161] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:53,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1936883696] [2021-05-02 13:16:53,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:53,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:53,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:16:53,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:53,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:53,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1561 backedges. 802 proven. 376 refuted. 0 times theorem prover too weak. 383 trivial. 0 not checked. [2021-05-02 13:16:53,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1936883696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:53,547 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:53,547 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20] total 39 [2021-05-02 13:16:53,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55720577] [2021-05-02 13:16:53,547 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 13:16:53,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:53,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 13:16:53,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=981, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:16:53,548 INFO L87 Difference]: Start difference. First operand 1343 states and 1651 transitions. Second operand has 39 states, 39 states have (on average 3.3333333333333335) internal successors, (130), 38 states have internal predecessors, (130), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:16:54,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:54,377 INFO L93 Difference]: Finished difference Result 3032 states and 3779 transitions. [2021-05-02 13:16:54,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 13:16:54,378 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.3333333333333335) internal successors, (130), 38 states have internal predecessors, (130), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 129 [2021-05-02 13:16:54,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:54,382 INFO L225 Difference]: With dead ends: 3032 [2021-05-02 13:16:54,382 INFO L226 Difference]: Without dead ends: 1817 [2021-05-02 13:16:54,385 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1129 ImplicationChecksByTransitivity, 812.9ms TimeCoverageRelationStatistics Valid=1159, Invalid=3001, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 13:16:54,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1817 states. [2021-05-02 13:16:54,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1817 to 1284. [2021-05-02 13:16:54,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1284 states, 1238 states have (on average 1.254442649434572) internal successors, (1553), 1248 states have internal predecessors, (1553), 28 states have call successors, (28), 18 states have call predecessors, (28), 17 states have return successors, (27), 17 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 13:16:54,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1284 states to 1284 states and 1608 transitions. [2021-05-02 13:16:54,434 INFO L78 Accepts]: Start accepts. Automaton has 1284 states and 1608 transitions. Word has length 129 [2021-05-02 13:16:54,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:54,434 INFO L480 AbstractCegarLoop]: Abstraction has 1284 states and 1608 transitions. [2021-05-02 13:16:54,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 3.3333333333333335) internal successors, (130), 38 states have internal predecessors, (130), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:16:54,434 INFO L276 IsEmpty]: Start isEmpty. Operand 1284 states and 1608 transitions. [2021-05-02 13:16:54,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-05-02 13:16:54,436 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:54,436 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 32, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:54,652 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 13:16:54,653 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:54,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:54,653 INFO L82 PathProgramCache]: Analyzing trace with hash -2073554825, now seen corresponding path program 2 times [2021-05-02 13:16:54,653 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:54,653 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183863706] [2021-05-02 13:16:54,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:54,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:54,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:54,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:54,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:54,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:54,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2021-05-02 13:16:54,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:54,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1760 backedges. 906 proven. 425 refuted. 0 times theorem prover too weak. 429 trivial. 0 not checked. [2021-05-02 13:16:54,903 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:54,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183863706] [2021-05-02 13:16:54,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1183863706] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:54,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850923083] [2021-05-02 13:16:54,903 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:54,962 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:54,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:54,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 13:16:54,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:54,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:54,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:55,490 INFO L134 CoverageAnalysis]: Checked inductivity of 1760 backedges. 7 proven. 1293 refuted. 0 times theorem prover too weak. 460 trivial. 0 not checked. [2021-05-02 13:16:55,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1850923083] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:55,490 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:55,490 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 42 [2021-05-02 13:16:55,491 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060670329] [2021-05-02 13:16:55,491 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 13:16:55,491 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:55,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 13:16:55,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=543, Invalid=1179, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:16:55,492 INFO L87 Difference]: Start difference. First operand 1284 states and 1608 transitions. Second operand has 42 states, 42 states have (on average 3.5) internal successors, (147), 41 states have internal predecessors, (147), 4 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 13:16:56,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:56,171 INFO L93 Difference]: Finished difference Result 2653 states and 3344 transitions. [2021-05-02 13:16:56,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 13:16:56,171 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.5) internal successors, (147), 41 states have internal predecessors, (147), 4 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 135 [2021-05-02 13:16:56,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:56,176 INFO L225 Difference]: With dead ends: 2653 [2021-05-02 13:16:56,176 INFO L226 Difference]: Without dead ends: 1885 [2021-05-02 13:16:56,186 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1089 ImplicationChecksByTransitivity, 769.1ms TimeCoverageRelationStatistics Valid=1088, Invalid=2694, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 13:16:56,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1885 states. [2021-05-02 13:16:56,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1885 to 1297. [2021-05-02 13:16:56,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1297 states, 1251 states have (on average 1.2621902478017586) internal successors, (1579), 1261 states have internal predecessors, (1579), 28 states have call successors, (28), 18 states have call predecessors, (28), 17 states have return successors, (27), 17 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 13:16:56,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1297 states to 1297 states and 1634 transitions. [2021-05-02 13:16:56,247 INFO L78 Accepts]: Start accepts. Automaton has 1297 states and 1634 transitions. Word has length 135 [2021-05-02 13:16:56,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:56,247 INFO L480 AbstractCegarLoop]: Abstraction has 1297 states and 1634 transitions. [2021-05-02 13:16:56,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 3.5) internal successors, (147), 41 states have internal predecessors, (147), 4 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 13:16:56,247 INFO L276 IsEmpty]: Start isEmpty. Operand 1297 states and 1634 transitions. [2021-05-02 13:16:56,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-05-02 13:16:56,249 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:56,249 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 34, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:56,465 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:56,465 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:56,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:56,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1097500153, now seen corresponding path program 1 times [2021-05-02 13:16:56,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:56,465 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129910061] [2021-05-02 13:16:56,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:56,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:56,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:56,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:56,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:56,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:56,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2021-05-02 13:16:56,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:56,541 INFO L134 CoverageAnalysis]: Checked inductivity of 1760 backedges. 3 proven. 907 refuted. 0 times theorem prover too weak. 850 trivial. 0 not checked. [2021-05-02 13:16:56,541 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:56,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129910061] [2021-05-02 13:16:56,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2129910061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:56,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188445662] [2021-05-02 13:16:56,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:56,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:56,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:16:56,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:56,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:56,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:57,001 INFO L134 CoverageAnalysis]: Checked inductivity of 1760 backedges. 903 proven. 425 refuted. 0 times theorem prover too weak. 432 trivial. 0 not checked. [2021-05-02 13:16:57,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188445662] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:57,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:57,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 21] total 25 [2021-05-02 13:16:57,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988260531] [2021-05-02 13:16:57,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:16:57,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:57,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:16:57,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=378, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:16:57,003 INFO L87 Difference]: Start difference. First operand 1297 states and 1634 transitions. Second operand has 25 states, 25 states have (on average 4.04) internal successors, (101), 24 states have internal predecessors, (101), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 13:16:58,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:58,306 INFO L93 Difference]: Finished difference Result 2805 states and 3530 transitions. [2021-05-02 13:16:58,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-02 13:16:58,307 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 4.04) internal successors, (101), 24 states have internal predecessors, (101), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 135 [2021-05-02 13:16:58,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:58,311 INFO L225 Difference]: With dead ends: 2805 [2021-05-02 13:16:58,311 INFO L226 Difference]: Without dead ends: 1827 [2021-05-02 13:16:58,314 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1655 ImplicationChecksByTransitivity, 1259.8ms TimeCoverageRelationStatistics Valid=2083, Invalid=4559, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 13:16:58,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1827 states. [2021-05-02 13:16:58,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1827 to 1477. [2021-05-02 13:16:58,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1477 states, 1429 states have (on average 1.2596221133659902) internal successors, (1800), 1439 states have internal predecessors, (1800), 30 states have call successors, (30), 18 states have call predecessors, (30), 17 states have return successors, (29), 19 states have call predecessors, (29), 29 states have call successors, (29) [2021-05-02 13:16:58,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1477 states to 1477 states and 1859 transitions. [2021-05-02 13:16:58,366 INFO L78 Accepts]: Start accepts. Automaton has 1477 states and 1859 transitions. Word has length 135 [2021-05-02 13:16:58,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:58,366 INFO L480 AbstractCegarLoop]: Abstraction has 1477 states and 1859 transitions. [2021-05-02 13:16:58,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 4.04) internal successors, (101), 24 states have internal predecessors, (101), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 13:16:58,366 INFO L276 IsEmpty]: Start isEmpty. Operand 1477 states and 1859 transitions. [2021-05-02 13:16:58,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-02 13:16:58,367 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:58,368 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 34, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:58,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 13:16:58,584 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:58,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:58,584 INFO L82 PathProgramCache]: Analyzing trace with hash -2043274909, now seen corresponding path program 3 times [2021-05-02 13:16:58,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:58,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [590774696] [2021-05-02 13:16:58,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:58,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:58,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:58,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:58,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:16:58,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:58,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 72 [2021-05-02 13:16:58,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:58,828 INFO L134 CoverageAnalysis]: Checked inductivity of 1971 backedges. 1013 proven. 477 refuted. 0 times theorem prover too weak. 481 trivial. 0 not checked. [2021-05-02 13:16:58,828 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:58,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [590774696] [2021-05-02 13:16:58,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [590774696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:58,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035386072] [2021-05-02 13:16:58,829 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:58,878 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:16:58,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:58,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:16:58,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:59,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1971 backedges. 0 proven. 1017 refuted. 0 times theorem prover too weak. 954 trivial. 0 not checked. [2021-05-02 13:16:59,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035386072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:59,225 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:59,225 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 11] total 33 [2021-05-02 13:16:59,225 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85804397] [2021-05-02 13:16:59,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:16:59,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:59,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:16:59,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=826, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:16:59,226 INFO L87 Difference]: Start difference. First operand 1477 states and 1859 transitions. Second operand has 33 states, 33 states have (on average 3.393939393939394) internal successors, (112), 31 states have internal predecessors, (112), 6 states have call successors, (10), 6 states have call predecessors, (10), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 13:17:02,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:02,269 INFO L93 Difference]: Finished difference Result 3157 states and 4007 transitions. [2021-05-02 13:17:02,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2021-05-02 13:17:02,271 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.393939393939394) internal successors, (112), 31 states have internal predecessors, (112), 6 states have call successors, (10), 6 states have call predecessors, (10), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 141 [2021-05-02 13:17:02,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:02,275 INFO L225 Difference]: With dead ends: 3157 [2021-05-02 13:17:02,276 INFO L226 Difference]: Without dead ends: 2220 [2021-05-02 13:17:02,279 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5488 ImplicationChecksByTransitivity, 2681.6ms TimeCoverageRelationStatistics Valid=3393, Invalid=14697, Unknown=0, NotChecked=0, Total=18090 [2021-05-02 13:17:02,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2220 states. [2021-05-02 13:17:02,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2220 to 1500. [2021-05-02 13:17:02,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1500 states, 1450 states have (on average 1.2544827586206897) internal successors, (1819), 1461 states have internal predecessors, (1819), 31 states have call successors, (31), 19 states have call predecessors, (31), 18 states have return successors, (30), 19 states have call predecessors, (30), 30 states have call successors, (30) [2021-05-02 13:17:02,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1500 states to 1500 states and 1880 transitions. [2021-05-02 13:17:02,326 INFO L78 Accepts]: Start accepts. Automaton has 1500 states and 1880 transitions. Word has length 141 [2021-05-02 13:17:02,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:02,326 INFO L480 AbstractCegarLoop]: Abstraction has 1500 states and 1880 transitions. [2021-05-02 13:17:02,326 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 3.393939393939394) internal successors, (112), 31 states have internal predecessors, (112), 6 states have call successors, (10), 6 states have call predecessors, (10), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 13:17:02,326 INFO L276 IsEmpty]: Start isEmpty. Operand 1500 states and 1880 transitions. [2021-05-02 13:17:02,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-05-02 13:17:02,328 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:02,328 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 36, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:02,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:02,533 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:02,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:02,533 INFO L82 PathProgramCache]: Analyzing trace with hash -1583590152, now seen corresponding path program 1 times [2021-05-02 13:17:02,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:02,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596152616] [2021-05-02 13:17:02,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:02,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:02,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:02,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:02,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:17:02,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:02,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 72 [2021-05-02 13:17:02,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:02,765 INFO L134 CoverageAnalysis]: Checked inductivity of 2081 backedges. 1067 proven. 477 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-05-02 13:17:02,765 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:02,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596152616] [2021-05-02 13:17:02,765 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1596152616] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:02,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [811968585] [2021-05-02 13:17:02,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:02,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:02,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 13:17:02,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:02,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:02,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:03,299 INFO L134 CoverageAnalysis]: Checked inductivity of 2081 backedges. 1065 proven. 477 refuted. 0 times theorem prover too weak. 539 trivial. 0 not checked. [2021-05-02 13:17:03,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [811968585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:03,299 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:03,299 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 42 [2021-05-02 13:17:03,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220730580] [2021-05-02 13:17:03,299 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 13:17:03,300 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:03,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 13:17:03,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=651, Invalid=1071, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:17:03,300 INFO L87 Difference]: Start difference. First operand 1500 states and 1880 transitions. Second operand has 42 states, 42 states have (on average 3.4047619047619047) internal successors, (143), 41 states have internal predecessors, (143), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:17:03,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:03,623 INFO L93 Difference]: Finished difference Result 2772 states and 3505 transitions. [2021-05-02 13:17:03,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:17:03,624 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.4047619047619047) internal successors, (143), 41 states have internal predecessors, (143), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 144 [2021-05-02 13:17:03,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:03,629 INFO L225 Difference]: With dead ends: 2772 [2021-05-02 13:17:03,629 INFO L226 Difference]: Without dead ends: 1614 [2021-05-02 13:17:03,631 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 719 ImplicationChecksByTransitivity, 467.9ms TimeCoverageRelationStatistics Valid=655, Invalid=1151, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:17:03,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1614 states. [2021-05-02 13:17:03,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1614 to 1551. [2021-05-02 13:17:03,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1551 states, 1501 states have (on average 1.2478347768154563) internal successors, (1873), 1512 states have internal predecessors, (1873), 31 states have call successors, (31), 19 states have call predecessors, (31), 18 states have return successors, (30), 19 states have call predecessors, (30), 30 states have call successors, (30) [2021-05-02 13:17:03,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1551 states to 1551 states and 1934 transitions. [2021-05-02 13:17:03,691 INFO L78 Accepts]: Start accepts. Automaton has 1551 states and 1934 transitions. Word has length 144 [2021-05-02 13:17:03,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:03,691 INFO L480 AbstractCegarLoop]: Abstraction has 1551 states and 1934 transitions. [2021-05-02 13:17:03,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 3.4047619047619047) internal successors, (143), 41 states have internal predecessors, (143), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:17:03,691 INFO L276 IsEmpty]: Start isEmpty. Operand 1551 states and 1934 transitions. [2021-05-02 13:17:03,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-02 13:17:03,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:03,693 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 36, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:03,908 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 13:17:03,909 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:03,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:03,909 INFO L82 PathProgramCache]: Analyzing trace with hash 773992181, now seen corresponding path program 5 times [2021-05-02 13:17:03,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:03,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865091541] [2021-05-02 13:17:03,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:03,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:04,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:04,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:04,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:17:04,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:04,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75 [2021-05-02 13:17:04,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:04,189 INFO L134 CoverageAnalysis]: Checked inductivity of 2194 backedges. 1125 proven. 532 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-05-02 13:17:04,189 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:04,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865091541] [2021-05-02 13:17:04,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865091541] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:04,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104698342] [2021-05-02 13:17:04,189 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:04,250 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 20 check-sat command(s) [2021-05-02 13:17:04,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:04,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 13:17:04,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:04,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:04,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:04,458 INFO L134 CoverageAnalysis]: Checked inductivity of 2194 backedges. 1212 proven. 2 refuted. 0 times theorem prover too weak. 980 trivial. 0 not checked. [2021-05-02 13:17:04,458 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104698342] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:04,458 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:04,458 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 6] total 28 [2021-05-02 13:17:04,458 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448495493] [2021-05-02 13:17:04,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:17:04,458 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:04,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:17:04,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=510, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:17:04,459 INFO L87 Difference]: Start difference. First operand 1551 states and 1934 transitions. Second operand has 28 states, 28 states have (on average 3.5714285714285716) internal successors, (100), 27 states have internal predecessors, (100), 3 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 13:17:06,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:06,631 INFO L93 Difference]: Finished difference Result 3342 states and 4133 transitions. [2021-05-02 13:17:06,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-05-02 13:17:06,631 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.5714285714285716) internal successors, (100), 27 states have internal predecessors, (100), 3 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 147 [2021-05-02 13:17:06,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:06,636 INFO L225 Difference]: With dead ends: 3342 [2021-05-02 13:17:06,636 INFO L226 Difference]: Without dead ends: 1980 [2021-05-02 13:17:06,639 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 185 SyntacticMatches, 1 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5813 ImplicationChecksByTransitivity, 1949.6ms TimeCoverageRelationStatistics Valid=3678, Invalid=12072, Unknown=0, NotChecked=0, Total=15750 [2021-05-02 13:17:06,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1980 states. [2021-05-02 13:17:06,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1980 to 1545. [2021-05-02 13:17:06,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1545 states, 1497 states have (on average 1.2391449565798263) internal successors, (1855), 1507 states have internal predecessors, (1855), 29 states have call successors, (29), 19 states have call predecessors, (29), 18 states have return successors, (28), 18 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-02 13:17:06,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1545 states to 1545 states and 1912 transitions. [2021-05-02 13:17:06,696 INFO L78 Accepts]: Start accepts. Automaton has 1545 states and 1912 transitions. Word has length 147 [2021-05-02 13:17:06,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:06,696 INFO L480 AbstractCegarLoop]: Abstraction has 1545 states and 1912 transitions. [2021-05-02 13:17:06,696 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.5714285714285716) internal successors, (100), 27 states have internal predecessors, (100), 3 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 13:17:06,697 INFO L276 IsEmpty]: Start isEmpty. Operand 1545 states and 1912 transitions. [2021-05-02 13:17:06,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-05-02 13:17:06,698 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:06,698 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 39, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:06,898 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 13:17:06,898 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:06,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:06,899 INFO L82 PathProgramCache]: Analyzing trace with hash 1654644705, now seen corresponding path program 2 times [2021-05-02 13:17:06,899 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:06,899 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573242098] [2021-05-02 13:17:06,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:06,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:07,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:07,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:07,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:17:07,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:07,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 78 [2021-05-02 13:17:07,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:07,175 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 1244 proven. 590 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2021-05-02 13:17:07,175 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:07,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573242098] [2021-05-02 13:17:07,175 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [573242098] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:07,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2111565028] [2021-05-02 13:17:07,175 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:07,230 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:17:07,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:07,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 13:17:07,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:07,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:07,756 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 1242 proven. 590 refuted. 0 times theorem prover too weak. 597 trivial. 0 not checked. [2021-05-02 13:17:07,756 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2111565028] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:07,756 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:07,756 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 46 [2021-05-02 13:17:07,756 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785428992] [2021-05-02 13:17:07,757 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 13:17:07,757 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:07,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 13:17:07,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=1288, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:17:07,757 INFO L87 Difference]: Start difference. First operand 1545 states and 1912 transitions. Second operand has 46 states, 46 states have (on average 3.369565217391304) internal successors, (155), 45 states have internal predecessors, (155), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:17:08,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:08,092 INFO L93 Difference]: Finished difference Result 3177 states and 3959 transitions. [2021-05-02 13:17:08,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:17:08,092 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.369565217391304) internal successors, (155), 45 states have internal predecessors, (155), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 153 [2021-05-02 13:17:08,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:08,096 INFO L225 Difference]: With dead ends: 3177 [2021-05-02 13:17:08,096 INFO L226 Difference]: Without dead ends: 1769 [2021-05-02 13:17:08,098 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 879 ImplicationChecksByTransitivity, 569.7ms TimeCoverageRelationStatistics Valid=786, Invalid=1376, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:17:08,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1769 states. [2021-05-02 13:17:08,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1769 to 1632. [2021-05-02 13:17:08,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1632 states, 1584 states have (on average 1.2367424242424243) internal successors, (1959), 1594 states have internal predecessors, (1959), 29 states have call successors, (29), 19 states have call predecessors, (29), 18 states have return successors, (28), 18 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-02 13:17:08,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1632 states to 1632 states and 2016 transitions. [2021-05-02 13:17:08,165 INFO L78 Accepts]: Start accepts. Automaton has 1632 states and 2016 transitions. Word has length 153 [2021-05-02 13:17:08,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:08,165 INFO L480 AbstractCegarLoop]: Abstraction has 1632 states and 2016 transitions. [2021-05-02 13:17:08,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.369565217391304) internal successors, (155), 45 states have internal predecessors, (155), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:17:08,165 INFO L276 IsEmpty]: Start isEmpty. Operand 1632 states and 2016 transitions. [2021-05-02 13:17:08,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-05-02 13:17:08,166 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:08,166 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 41, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:08,380 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 13:17:08,381 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:08,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:08,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1287111815, now seen corresponding path program 3 times [2021-05-02 13:17:08,381 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:08,381 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253976916] [2021-05-02 13:17:08,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:08,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:08,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:08,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:08,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:17:08,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:08,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2021-05-02 13:17:08,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:08,684 INFO L134 CoverageAnalysis]: Checked inductivity of 2676 backedges. 1369 proven. 651 refuted. 0 times theorem prover too weak. 656 trivial. 0 not checked. [2021-05-02 13:17:08,684 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:08,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1253976916] [2021-05-02 13:17:08,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1253976916] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:08,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [566499309] [2021-05-02 13:17:08,684 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:08,725 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:17:08,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:08,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 13:17:08,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:09,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:09,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:09,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:09,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:09,088 INFO L134 CoverageAnalysis]: Checked inductivity of 2676 backedges. 0 proven. 1374 refuted. 0 times theorem prover too weak. 1302 trivial. 0 not checked. [2021-05-02 13:17:09,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [566499309] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:09,088 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:09,088 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 11] total 35 [2021-05-02 13:17:09,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802089362] [2021-05-02 13:17:09,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:17:09,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:09,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:17:09,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=884, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:17:09,089 INFO L87 Difference]: Start difference. First operand 1632 states and 2016 transitions. Second operand has 35 states, 35 states have (on average 3.3714285714285714) internal successors, (118), 33 states have internal predecessors, (118), 5 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:17:13,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:13,475 INFO L93 Difference]: Finished difference Result 3744 states and 4653 transitions. [2021-05-02 13:17:13,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2021-05-02 13:17:13,476 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.3714285714285714) internal successors, (118), 33 states have internal predecessors, (118), 5 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 159 [2021-05-02 13:17:13,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:13,482 INFO L225 Difference]: With dead ends: 3744 [2021-05-02 13:17:13,482 INFO L226 Difference]: Without dead ends: 2258 [2021-05-02 13:17:13,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10415 ImplicationChecksByTransitivity, 3998.9ms TimeCoverageRelationStatistics Valid=6186, Invalid=24614, Unknown=0, NotChecked=0, Total=30800 [2021-05-02 13:17:13,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2258 states. [2021-05-02 13:17:13,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2258 to 2007. [2021-05-02 13:17:13,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2007 states, 1951 states have (on average 1.2347514095335725) internal successors, (2409), 1962 states have internal predecessors, (2409), 33 states have call successors, (33), 23 states have call predecessors, (33), 22 states have return successors, (32), 21 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-02 13:17:13,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2007 states to 2007 states and 2474 transitions. [2021-05-02 13:17:13,567 INFO L78 Accepts]: Start accepts. Automaton has 2007 states and 2474 transitions. Word has length 159 [2021-05-02 13:17:13,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:13,567 INFO L480 AbstractCegarLoop]: Abstraction has 2007 states and 2474 transitions. [2021-05-02 13:17:13,567 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 3.3714285714285714) internal successors, (118), 33 states have internal predecessors, (118), 5 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:17:13,568 INFO L276 IsEmpty]: Start isEmpty. Operand 2007 states and 2474 transitions. [2021-05-02 13:17:13,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-05-02 13:17:13,570 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:13,570 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 44, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:13,776 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:13,776 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:13,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:13,777 INFO L82 PathProgramCache]: Analyzing trace with hash -254500426, now seen corresponding path program 6 times [2021-05-02 13:17:13,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:13,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262226321] [2021-05-02 13:17:13,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:13,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:14,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:14,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:14,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:17:14,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:14,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 84 [2021-05-02 13:17:14,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:14,148 INFO L134 CoverageAnalysis]: Checked inductivity of 3069 backedges. 1567 proven. 715 refuted. 0 times theorem prover too weak. 787 trivial. 0 not checked. [2021-05-02 13:17:14,148 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:14,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262226321] [2021-05-02 13:17:14,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [262226321] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:14,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759555797] [2021-05-02 13:17:14,148 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:14,202 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 13:17:14,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:14,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:17:14,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:14,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:14,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:14,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:14,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:14,451 INFO L134 CoverageAnalysis]: Checked inductivity of 3069 backedges. 1615 proven. 67 refuted. 0 times theorem prover too weak. 1387 trivial. 0 not checked. [2021-05-02 13:17:14,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759555797] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:14,451 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:14,451 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 5] total 30 [2021-05-02 13:17:14,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877797120] [2021-05-02 13:17:14,452 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 13:17:14,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:14,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 13:17:14,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=558, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:17:14,452 INFO L87 Difference]: Start difference. First operand 2007 states and 2474 transitions. Second operand has 30 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 29 states have internal predecessors, (116), 4 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:17:16,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:16,759 INFO L93 Difference]: Finished difference Result 3235 states and 3996 transitions. [2021-05-02 13:17:16,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-05-02 13:17:16,759 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 29 states have internal predecessors, (116), 4 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 168 [2021-05-02 13:17:16,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:16,762 INFO L225 Difference]: With dead ends: 3235 [2021-05-02 13:17:16,762 INFO L226 Difference]: Without dead ends: 1552 [2021-05-02 13:17:16,770 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 218 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5115 ImplicationChecksByTransitivity, 2093.9ms TimeCoverageRelationStatistics Valid=4539, Invalid=10961, Unknown=0, NotChecked=0, Total=15500 [2021-05-02 13:17:16,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1552 states. [2021-05-02 13:17:16,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1552 to 994. [2021-05-02 13:17:16,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 994 states, 964 states have (on average 1.1607883817427387) internal successors, (1119), 968 states have internal predecessors, (1119), 15 states have call successors, (15), 15 states have call predecessors, (15), 14 states have return successors, (14), 10 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 13:17:16,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 994 states to 994 states and 1148 transitions. [2021-05-02 13:17:16,811 INFO L78 Accepts]: Start accepts. Automaton has 994 states and 1148 transitions. Word has length 168 [2021-05-02 13:17:16,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:16,811 INFO L480 AbstractCegarLoop]: Abstraction has 994 states and 1148 transitions. [2021-05-02 13:17:16,812 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 29 states have internal predecessors, (116), 4 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:17:16,812 INFO L276 IsEmpty]: Start isEmpty. Operand 994 states and 1148 transitions. [2021-05-02 13:17:16,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2021-05-02 13:17:16,813 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:16,813 INFO L523 BasicCegarLoop]: trace histogram [69, 69, 66, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:17,028 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 13:17:17,029 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:17,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:17,029 INFO L82 PathProgramCache]: Analyzing trace with hash -1112726671, now seen corresponding path program 4 times [2021-05-02 13:17:17,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:17,029 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755921881] [2021-05-02 13:17:17,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:17,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:17,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:17,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:17,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:17:17,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:17,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87 [2021-05-02 13:17:17,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:17,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 167 [2021-05-02 13:17:17,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:17,409 INFO L134 CoverageAnalysis]: Checked inductivity of 7274 backedges. 3274 proven. 782 refuted. 0 times theorem prover too weak. 3218 trivial. 0 not checked. [2021-05-02 13:17:17,409 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:17,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755921881] [2021-05-02 13:17:17,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755921881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:17,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1875300269] [2021-05-02 13:17:17,409 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:17,518 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:17:17,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:17,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 547 conjuncts, 73 conjunts are in the unsatisfiable core [2021-05-02 13:17:17,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:17,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:17,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:18,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:19,859 INFO L134 CoverageAnalysis]: Checked inductivity of 7274 backedges. 715 proven. 5773 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2021-05-02 13:17:19,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1875300269] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:19,859 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:19,859 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 58] total 84 [2021-05-02 13:17:19,859 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212303757] [2021-05-02 13:17:19,860 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-02 13:17:19,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:19,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-02 13:17:19,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1052, Invalid=5920, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 13:17:19,861 INFO L87 Difference]: Start difference. First operand 994 states and 1148 transitions. Second operand has 84 states, 84 states have (on average 3.130952380952381) internal successors, (263), 82 states have internal predecessors, (263), 6 states have call successors, (11), 6 states have call predecessors, (11), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 13:17:23,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:23,673 INFO L93 Difference]: Finished difference Result 2297 states and 2671 transitions. [2021-05-02 13:17:23,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-05-02 13:17:23,674 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 3.130952380952381) internal successors, (263), 82 states have internal predecessors, (263), 6 states have call successors, (11), 6 states have call predecessors, (11), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 251 [2021-05-02 13:17:23,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:23,677 INFO L225 Difference]: With dead ends: 2297 [2021-05-02 13:17:23,677 INFO L226 Difference]: Without dead ends: 1467 [2021-05-02 13:17:23,679 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11018 ImplicationChecksByTransitivity, 4776.3ms TimeCoverageRelationStatistics Valid=5123, Invalid=28183, Unknown=0, NotChecked=0, Total=33306 [2021-05-02 13:17:23,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1467 states. [2021-05-02 13:17:23,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1467 to 1039. [2021-05-02 13:17:23,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1039 states, 1009 states have (on average 1.1605550049554014) internal successors, (1171), 1013 states have internal predecessors, (1171), 15 states have call successors, (15), 15 states have call predecessors, (15), 14 states have return successors, (14), 10 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 13:17:23,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1039 states to 1039 states and 1200 transitions. [2021-05-02 13:17:23,724 INFO L78 Accepts]: Start accepts. Automaton has 1039 states and 1200 transitions. Word has length 251 [2021-05-02 13:17:23,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:23,724 INFO L480 AbstractCegarLoop]: Abstraction has 1039 states and 1200 transitions. [2021-05-02 13:17:23,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 84 states, 84 states have (on average 3.130952380952381) internal successors, (263), 82 states have internal predecessors, (263), 6 states have call successors, (11), 6 states have call predecessors, (11), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 13:17:23,724 INFO L276 IsEmpty]: Start isEmpty. Operand 1039 states and 1200 transitions. [2021-05-02 13:17:23,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2021-05-02 13:17:23,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:23,726 INFO L523 BasicCegarLoop]: trace histogram [72, 72, 69, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:23,926 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:23,927 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:23,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:23,927 INFO L82 PathProgramCache]: Analyzing trace with hash 321286522, now seen corresponding path program 5 times [2021-05-02 13:17:23,927 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:23,927 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767903684] [2021-05-02 13:17:23,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:23,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:24,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:24,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:24,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:17:24,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:24,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 13:17:24,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:24,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 173 [2021-05-02 13:17:24,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:24,337 INFO L134 CoverageAnalysis]: Checked inductivity of 7913 backedges. 3560 proven. 852 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2021-05-02 13:17:24,337 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:24,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767903684] [2021-05-02 13:17:24,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1767903684] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:24,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497767339] [2021-05-02 13:17:24,337 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:24,452 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 50 check-sat command(s) [2021-05-02 13:17:24,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:24,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 602 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 13:17:24,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:24,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:24,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:25,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:25,177 INFO L134 CoverageAnalysis]: Checked inductivity of 7913 backedges. 3556 proven. 852 refuted. 0 times theorem prover too weak. 3505 trivial. 0 not checked. [2021-05-02 13:17:25,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [497767339] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:25,177 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:25,177 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 54 [2021-05-02 13:17:25,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663205091] [2021-05-02 13:17:25,178 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 13:17:25,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:25,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 13:17:25,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1080, Invalid=1782, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 13:17:25,179 INFO L87 Difference]: Start difference. First operand 1039 states and 1200 transitions. Second operand has 54 states, 54 states have (on average 3.2777777777777777) internal successors, (177), 53 states have internal predecessors, (177), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:17:25,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:25,471 INFO L93 Difference]: Finished difference Result 2019 states and 2346 transitions. [2021-05-02 13:17:25,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:17:25,471 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.2777777777777777) internal successors, (177), 53 states have internal predecessors, (177), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 260 [2021-05-02 13:17:25,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:25,473 INFO L225 Difference]: With dead ends: 2019 [2021-05-02 13:17:25,473 INFO L226 Difference]: Without dead ends: 1153 [2021-05-02 13:17:25,474 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 799.8ms TimeCoverageRelationStatistics Valid=1084, Invalid=1886, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 13:17:25,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1153 states. [2021-05-02 13:17:25,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1153 to 1084. [2021-05-02 13:17:25,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1084 states, 1054 states have (on average 1.1603415559772297) internal successors, (1223), 1058 states have internal predecessors, (1223), 15 states have call successors, (15), 15 states have call predecessors, (15), 14 states have return successors, (14), 10 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 13:17:25,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1084 states to 1084 states and 1252 transitions. [2021-05-02 13:17:25,520 INFO L78 Accepts]: Start accepts. Automaton has 1084 states and 1252 transitions. Word has length 260 [2021-05-02 13:17:25,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:25,520 INFO L480 AbstractCegarLoop]: Abstraction has 1084 states and 1252 transitions. [2021-05-02 13:17:25,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 3.2777777777777777) internal successors, (177), 53 states have internal predecessors, (177), 3 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 13:17:25,520 INFO L276 IsEmpty]: Start isEmpty. Operand 1084 states and 1252 transitions. [2021-05-02 13:17:25,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2021-05-02 13:17:25,522 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:25,522 INFO L523 BasicCegarLoop]: trace histogram [75, 75, 72, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:25,722 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 13:17:25,723 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:25,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:25,723 INFO L82 PathProgramCache]: Analyzing trace with hash 180911505, now seen corresponding path program 6 times [2021-05-02 13:17:25,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:25,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188117142] [2021-05-02 13:17:25,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:25,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:26,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:26,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:26,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 13:17:26,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:26,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2021-05-02 13:17:26,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:26,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 179 [2021-05-02 13:17:26,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:26,125 INFO L134 CoverageAnalysis]: Checked inductivity of 8579 backedges. 3858 proven. 925 refuted. 0 times theorem prover too weak. 3796 trivial. 0 not checked. [2021-05-02 13:17:26,125 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:26,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188117142] [2021-05-02 13:17:26,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [188117142] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:26,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283993372] [2021-05-02 13:17:26,125 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:26,176 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 13:17:26,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:26,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:17:26,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:26,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:26,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:26,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:26,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:26,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:26,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:26,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:26,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:26,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:26,734 INFO L134 CoverageAnalysis]: Checked inductivity of 8579 backedges. 3943 proven. 1 refuted. 0 times theorem prover too weak. 4635 trivial. 0 not checked. [2021-05-02 13:17:26,734 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283993372] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:26,734 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:26,734 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 12] total 40 [2021-05-02 13:17:26,734 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888862211] [2021-05-02 13:17:26,735 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 13:17:26,735 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:26,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 13:17:26,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=409, Invalid=1151, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:17:26,736 INFO L87 Difference]: Start difference. First operand 1084 states and 1252 transitions. Second operand has 40 states, 40 states have (on average 3.375) internal successors, (135), 38 states have internal predecessors, (135), 4 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:17:28,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:28,029 INFO L93 Difference]: Finished difference Result 2120 states and 2477 transitions. [2021-05-02 13:17:28,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 13:17:28,030 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.375) internal successors, (135), 38 states have internal predecessors, (135), 4 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 269 [2021-05-02 13:17:28,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:28,030 INFO L225 Difference]: With dead ends: 2120 [2021-05-02 13:17:28,030 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 13:17:28,034 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 267 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 922 ImplicationChecksByTransitivity, 1448.1ms TimeCoverageRelationStatistics Valid=1347, Invalid=4055, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 13:17:28,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 13:17:28,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 13:17:28,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 13:17:28,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 13:17:28,034 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 269 [2021-05-02 13:17:28,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:28,034 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 13:17:28,034 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 3.375) internal successors, (135), 38 states have internal predecessors, (135), 4 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:17:28,034 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 13:17:28,034 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 13:17:28,247 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 13:17:28,249 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 13:17:28,379 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 125 [2021-05-02 13:17:28,549 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 180 [2021-05-02 13:17:36,667 WARN L205 SmtUtils]: Spent 8.11 s on a formula simplification. DAG size of input: 2829 DAG size of output: 1662 [2021-05-02 13:17:37,253 WARN L205 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 43 [2021-05-02 13:17:37,783 WARN L205 SmtUtils]: Spent 523.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 48 [2021-05-02 13:17:51,219 WARN L205 SmtUtils]: Spent 13.41 s on a formula simplification. DAG size of input: 1532 DAG size of output: 41 [2021-05-02 13:17:51,344 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 1 [2021-05-02 13:17:51,348 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 3) no Hoare annotation was computed. [2021-05-02 13:17:51,348 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 3) no Hoare annotation was computed. [2021-05-02 13:17:51,348 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 3) no Hoare annotation was computed. [2021-05-02 13:17:51,348 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-02 13:17:51,348 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= ~SIZE~0 |old(~SIZE~0)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= ~last~0 |old(~last~0)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-02 13:17:51,348 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-02 13:17:51,348 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-02 13:17:51,348 INFO L194 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: (and (<= (+ ~last~0 199993) ~SIZE~0) (= ~SIZE~0 200000)) [2021-05-02 13:17:51,348 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-02 13:17:51,348 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-02 13:17:51,348 INFO L201 CegarLoopUtils]: At program point assume_abort_if_notENTRY(lines 5 7) the Hoare annotation is: true [2021-05-02 13:17:51,348 INFO L198 CegarLoopUtils]: For program point L6(line 6) no Hoare annotation was computed. [2021-05-02 13:17:51,349 INFO L198 CegarLoopUtils]: For program point L6-2(lines 5 7) no Hoare annotation was computed. [2021-05-02 13:17:51,349 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 5 7) no Hoare annotation was computed. [2021-05-02 13:17:51,349 INFO L198 CegarLoopUtils]: For program point L27-2(lines 27 29) no Hoare annotation was computed. [2021-05-02 13:17:51,349 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 20 47) no Hoare annotation was computed. [2021-05-02 13:17:51,349 INFO L194 CegarLoopUtils]: At program point L27-3(lines 27 29) the Hoare annotation is: (let ((.cse10 (+ ~last~0 1))) (let ((.cse4 (= main_~d~0 0)) (.cse6 (< main_~c~0 .cse10)) (.cse7 (= main_~st~0 1)) (.cse8 (<= (+ ~last~0 199983) ~SIZE~0)) (.cse0 (= main_~st~0 0)) (.cse1 (<= .cse10 main_~c~0)) (.cse9 (<= (+ main_~d~0 199998) ~SIZE~0)) (.cse2 (= main_~b~0 main_~a~0)) (.cse3 (< 0 ~last~0)) (.cse5 (< main_~c~0 (+ ~SIZE~0 1)))) (or (and .cse0 .cse1 .cse2 .cse3 .cse4 .cse5) (and .cse6 .cse2 .cse7 .cse3 .cse4 .cse5) (and .cse6 .cse8 .cse9 .cse2 .cse7 .cse3) (not (<= (+ |old(~last~0)| 199993) ~SIZE~0)) (and .cse8 .cse0 .cse1 .cse9 .cse2 .cse3 .cse5) (not (= ~SIZE~0 200000))))) [2021-05-02 13:17:51,349 INFO L201 CegarLoopUtils]: At program point L23(line 23) the Hoare annotation is: true [2021-05-02 13:17:51,349 INFO L198 CegarLoopUtils]: For program point L27-4(lines 25 45) no Hoare annotation was computed. [2021-05-02 13:17:51,349 INFO L198 CegarLoopUtils]: For program point L23-1(line 23) no Hoare annotation was computed. [2021-05-02 13:17:51,349 INFO L194 CegarLoopUtils]: At program point L44(lines 25 45) the Hoare annotation is: (let ((.cse2 (<= ~SIZE~0 main_~c~0)) (.cse3 (= main_~b~0 main_~a~0)) (.cse1 (= main_~d~0 0)) (.cse0 (< 0 ~last~0)) (.cse5 (+ ~last~0 1)) (.cse4 (< main_~c~0 (+ ~SIZE~0 1)))) (or (and (= main_~c~0 0) .cse0 .cse1 (= main_~a~0 0) (= main_~b~0 0)) (and .cse2 (<= (+ ~last~0 199983) main_~c~0) (<= (+ main_~d~0 199998) ~SIZE~0) .cse3 .cse0 .cse4) (and (or (and (= main_~st~0 0) .cse0 .cse1) (and (< main_~c~0 .cse5) .cse1)) .cse2 .cse3 .cse4) (and .cse2 .cse3 .cse1 .cse0 (< .cse5 main_~c~0) .cse4) (not (<= (+ |old(~last~0)| 199993) ~SIZE~0)) (not (= ~SIZE~0 200000)))) [2021-05-02 13:17:51,349 INFO L198 CegarLoopUtils]: For program point L36(lines 36 38) no Hoare annotation was computed. [2021-05-02 13:17:51,349 INFO L198 CegarLoopUtils]: For program point L36-2(lines 25 45) no Hoare annotation was computed. [2021-05-02 13:17:51,349 INFO L198 CegarLoopUtils]: For program point L28(line 28) no Hoare annotation was computed. [2021-05-02 13:17:51,349 INFO L198 CegarLoopUtils]: For program point L25-2(lines 25 45) no Hoare annotation was computed. [2021-05-02 13:17:51,349 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 20 47) no Hoare annotation was computed. [2021-05-02 13:17:51,349 INFO L194 CegarLoopUtils]: At program point mainENTRY(lines 20 47) the Hoare annotation is: (or (= ~last~0 |old(~last~0)|) (not (<= (+ |old(~last~0)| 199993) ~SIZE~0)) (not (= ~SIZE~0 200000))) [2021-05-02 13:17:51,349 INFO L198 CegarLoopUtils]: For program point L30-1(lines 25 45) no Hoare annotation was computed. [2021-05-02 13:17:51,350 INFO L194 CegarLoopUtils]: At program point L39-1(lines 39 42) the Hoare annotation is: (let ((.cse2 (= main_~d~0 0)) (.cse1 (+ ~last~0 1)) (.cse0 (<= ~SIZE~0 main_~c~0)) (.cse4 (= main_~b~0 main_~a~0)) (.cse3 (< 0 ~last~0)) (.cse5 (< main_~c~0 (+ ~SIZE~0 1)))) (or (and .cse0 (or (and (< main_~c~0 .cse1) (= main_~st~0 1) .cse2) (and (= main_~st~0 0) .cse2 .cse3 (< ~last~0 main_~c~0))) .cse4 .cse5) (and .cse0 .cse4 .cse2 .cse3 (< .cse1 main_~c~0) .cse5) (and (<= (+ ~last~0 199983) main_~c~0) .cse0 (<= (+ main_~d~0 199998) ~SIZE~0) .cse4 .cse3 .cse5) (not (<= (+ |old(~last~0)| 199993) ~SIZE~0)) (not (= ~SIZE~0 200000)))) [2021-05-02 13:17:51,350 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 10 15) the Hoare annotation is: true [2021-05-02 13:17:51,350 INFO L198 CegarLoopUtils]: For program point L12(line 12) no Hoare annotation was computed. [2021-05-02 13:17:51,350 INFO L198 CegarLoopUtils]: For program point L11(lines 11 13) no Hoare annotation was computed. [2021-05-02 13:17:51,350 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 10 15) no Hoare annotation was computed. [2021-05-02 13:17:51,350 INFO L198 CegarLoopUtils]: For program point L11-2(lines 10 15) no Hoare annotation was computed. [2021-05-02 13:17:51,350 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2021-05-02 13:17:51,374 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 01:17:51 BoogieIcfgContainer [2021-05-02 13:17:51,374 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 13:17:51,375 INFO L168 Benchmark]: Toolchain (without parser) took 81883.20 ms. Allocated memory was 190.8 MB in the beginning and 1.7 GB in the end (delta: 1.5 GB). Free memory was 154.8 MB in the beginning and 1.1 GB in the end (delta: -980.1 MB). Peak memory consumption was 1.0 GB. Max. memory is 8.0 GB. [2021-05-02 13:17:51,375 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 190.8 MB. Free memory is still 171.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 13:17:51,375 INFO L168 Benchmark]: CACSL2BoogieTranslator took 227.84 ms. Allocated memory is still 190.8 MB. Free memory was 154.6 MB in the beginning and 172.9 MB in the end (delta: -18.3 MB). Peak memory consumption was 11.9 MB. Max. memory is 8.0 GB. [2021-05-02 13:17:51,375 INFO L168 Benchmark]: Boogie Preprocessor took 34.57 ms. Allocated memory is still 190.8 MB. Free memory was 172.9 MB in the beginning and 171.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 13:17:51,375 INFO L168 Benchmark]: RCFGBuilder took 333.05 ms. Allocated memory is still 190.8 MB. Free memory was 171.3 MB in the beginning and 154.6 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-05-02 13:17:51,375 INFO L168 Benchmark]: TraceAbstraction took 81281.21 ms. Allocated memory was 190.8 MB in the beginning and 1.7 GB in the end (delta: 1.5 GB). Free memory was 154.0 MB in the beginning and 1.1 GB in the end (delta: -980.8 MB). Peak memory consumption was 1.0 GB. Max. memory is 8.0 GB. [2021-05-02 13:17:51,377 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 190.8 MB. Free memory is still 171.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 227.84 ms. Allocated memory is still 190.8 MB. Free memory was 154.6 MB in the beginning and 172.9 MB in the end (delta: -18.3 MB). Peak memory consumption was 11.9 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 34.57 ms. Allocated memory is still 190.8 MB. Free memory was 172.9 MB in the beginning and 171.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 333.05 ms. Allocated memory is still 190.8 MB. Free memory was 171.3 MB in the beginning and 154.6 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 81281.21 ms. Allocated memory was 190.8 MB in the beginning and 1.7 GB in the end (delta: 1.5 GB). Free memory was 154.0 MB in the beginning and 1.1 GB in the end (delta: -980.8 MB). Peak memory consumption was 1.0 GB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 12]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 35 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 58105.5ms, OverallIterations: 39, TraceHistogramMax: 75, EmptinessCheckTime: 48.6ms, AutomataDifference: 29913.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 23099.1ms, InitialAbstractionConstructionTime: 8.8ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 883 SDtfs, 8017 SDslu, 1401 SDs, 0 SdLazy, 17719 SolverSat, 1935 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 7312.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5027 GetRequests, 3240 SyntacticMatches, 1 SemanticMatches, 1786 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54826 ImplicationChecksByTransitivity, 29676.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=2007occurred in iteration=35, InterpolantAutomatonStates: 1293, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 1037.8ms AutomataMinimizationTime, 39 MinimizatonAttempts, 5161 StatesRemovedByMinimization, 36 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 10 LocationsWithAnnotation, 459 PreInvPairs, 858 NumberOfFragments, 380 HoareAnnotationTreeSize, 459 FomulaSimplifications, 6532048610 FormulaSimplificationTreeSizeReduction, 8627.8ms HoareSimplificationTime, 10 FomulaSimplificationsInter, 80996085 FormulaSimplificationTreeSizeReductionInter, 14443.1ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 389.2ms SsaConstructionTime, 1107.5ms SatisfiabilityAnalysisTime, 17838.5ms InterpolantComputationTime, 6840 NumberOfCodeBlocks, 6065 NumberOfCodeBlocksAsserted, 168 NumberOfCheckSat, 6769 ConstructedInterpolants, 0 QuantifiedInterpolants, 27461 SizeOfPredicates, 84 NumberOfNonLiveVariables, 7258 ConjunctsInSsa, 564 ConjunctsInUnsatCore, 71 InterpolantComputations, 11 PerfectInterpolantSequences, 73915/100785 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: ((((((((c == 0 && 0 < last) && d == 0) && a == 0) && b == 0) || (((((SIZE <= c && last + 199983 <= c) && d + 199998 <= SIZE) && b == a) && 0 < last) && c < SIZE + 1)) || ((((((st == 0 && 0 < last) && d == 0) || (c < last + 1 && d == 0)) && SIZE <= c) && b == a) && c < SIZE + 1)) || (((((SIZE <= c && b == a) && d == 0) && 0 < last) && last + 1 < c) && c < SIZE + 1)) || !(\old(last) + 199993 <= SIZE)) || !(SIZE == 200000) - InvariantResult [Line: 27]: Loop Invariant Derived loop invariant: (((((((((st == 0 && last + 1 <= c) && b == a) && 0 < last) && d == 0) && c < SIZE + 1) || (((((c < last + 1 && b == a) && st == 1) && 0 < last) && d == 0) && c < SIZE + 1)) || (((((c < last + 1 && last + 199983 <= SIZE) && d + 199998 <= SIZE) && b == a) && st == 1) && 0 < last)) || !(\old(last) + 199993 <= SIZE)) || ((((((last + 199983 <= SIZE && st == 0) && last + 1 <= c) && d + 199998 <= SIZE) && b == a) && 0 < last) && c < SIZE + 1)) || !(SIZE == 200000) RESULT: Ultimate proved your program to be correct! Received shutdown request...