/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/nested3-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:15:54,809 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:15:54,813 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:15:54,854 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:15:54,876 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:15:54,878 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:15:54,880 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:15:54,882 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:15:54,884 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:15:54,885 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:15:54,888 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:15:54,893 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:15:54,895 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:15:54,896 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:15:54,897 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:15:54,899 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:15:54,906 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:15:54,918 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:15:54,919 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:15:54,919 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:15:54,924 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 13:15:54,977 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:15:54,977 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:15:54,979 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:15:54,979 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:15:54,979 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:15:54,979 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:15:54,979 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:15:54,980 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:15:54,980 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:15:54,980 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:15:54,980 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:15:54,980 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:15:54,980 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:15:54,980 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:15:54,981 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:15:54,981 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:15:54,981 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:15:54,981 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:15:54,981 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:15:54,981 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:15:54,982 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:15:54,982 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:15:54,982 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:15:54,982 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:15:54,982 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:15:54,982 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:15:54,982 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:15:54,983 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:15:54,983 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:15:55,358 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:15:55,391 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:15:55,394 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:15:55,395 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:15:55,396 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:15:55,397 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested3-2.c [2021-05-02 13:15:55,472 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92c472d67/448a75aab9c048238ac25a12d67146e3/FLAG5c44d55f5 [2021-05-02 13:15:55,944 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:15:55,945 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested3-2.c [2021-05-02 13:15:55,950 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92c472d67/448a75aab9c048238ac25a12d67146e3/FLAG5c44d55f5 [2021-05-02 13:15:56,445 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92c472d67/448a75aab9c048238ac25a12d67146e3 [2021-05-02 13:15:56,449 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:15:56,450 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:15:56,453 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:15:56,453 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:15:56,457 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:15:56,458 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:15:56" (1/1) ... [2021-05-02 13:15:56,459 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1dc58a84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:56, skipping insertion in model container [2021-05-02 13:15:56,459 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:15:56" (1/1) ... [2021-05-02 13:15:56,466 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:15:56,480 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:15:56,600 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/nested3-2.c[321,334] [2021-05-02 13:15:56,612 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:15:56,620 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:15:56,639 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/nested3-2.c[321,334] [2021-05-02 13:15:56,643 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:15:56,656 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:15:56,656 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:56 WrapperNode [2021-05-02 13:15:56,657 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:15:56,657 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:15:56,658 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:15:56,658 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:15:56,674 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:56" (1/1) ... [2021-05-02 13:15:56,675 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:56" (1/1) ... [2021-05-02 13:15:56,703 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:56" (1/1) ... [2021-05-02 13:15:56,704 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:56" (1/1) ... [2021-05-02 13:15:56,708 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:56" (1/1) ... [2021-05-02 13:15:56,712 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:56" (1/1) ... [2021-05-02 13:15:56,713 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:56" (1/1) ... [2021-05-02 13:15:56,715 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:15:56,716 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:15:56,716 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:15:56,716 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:15:56,717 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:56" (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 13:15:56,793 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:15:56,794 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:15:56,794 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:15:56,794 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:15:56,794 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:15:56,795 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:15:56,795 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:15:56,796 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:15:56,796 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:15:56,796 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:15:56,796 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:15:56,796 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:15:56,797 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:15:56,797 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:15:56,799 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:15:56,799 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:15:56,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:15:57,134 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:15:57,134 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-02 13:15:57,135 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:15:57 BoogieIcfgContainer [2021-05-02 13:15:57,136 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:15:57,137 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:15:57,137 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:15:57,142 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:15:57,142 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:15:56" (1/3) ... [2021-05-02 13:15:57,143 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43bdf4a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:15:57, skipping insertion in model container [2021-05-02 13:15:57,143 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:56" (2/3) ... [2021-05-02 13:15:57,144 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43bdf4a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:15:57, skipping insertion in model container [2021-05-02 13:15:57,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:15:57" (3/3) ... [2021-05-02 13:15:57,145 INFO L111 eAbstractionObserver]: Analyzing ICFG nested3-2.c [2021-05-02 13:15:57,150 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:15:57,182 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:15:57,205 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:15:57,236 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:15:57,236 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:15:57,236 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:15:57,237 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:15:57,237 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:15:57,237 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:15:57,237 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:15:57,237 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:15:57,251 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:15:57,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:15:57,256 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:57,256 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:57,256 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:57,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:57,262 INFO L82 PathProgramCache]: Analyzing trace with hash -1794590667, now seen corresponding path program 1 times [2021-05-02 13:15:57,270 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:57,270 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121154276] [2021-05-02 13:15:57,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:57,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:57,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:57,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:57,582 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 13:15:57,582 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:57,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121154276] [2021-05-02 13:15:57,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1121154276] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:15:57,584 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:15:57,584 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:15:57,584 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401454692] [2021-05-02 13:15:57,588 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:15:57,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:57,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:15:57,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:15:57,604 INFO L87 Difference]: Start difference. First operand has 25 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:57,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:57,703 INFO L93 Difference]: Finished difference Result 44 states and 63 transitions. [2021-05-02 13:15:57,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:15:57,705 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:15:57,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:57,711 INFO L225 Difference]: With dead ends: 44 [2021-05-02 13:15:57,712 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 13:15:57,716 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 72.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:15:57,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 13:15:57,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-02 13:15:57,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:57,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-05-02 13:15:57,762 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 11 [2021-05-02 13:15:57,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:57,762 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-05-02 13:15:57,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:57,762 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-05-02 13:15:57,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:15:57,764 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:57,764 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:57,764 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:15:57,764 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:57,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:57,765 INFO L82 PathProgramCache]: Analyzing trace with hash -1824143339, now seen corresponding path program 1 times [2021-05-02 13:15:57,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:57,766 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880897078] [2021-05-02 13:15:57,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:57,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:57,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:57,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:57,948 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 13:15:57,949 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:57,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880897078] [2021-05-02 13:15:57,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [880897078] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:15:57,979 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:15:57,980 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:15:57,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338120575] [2021-05-02 13:15:58,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:15:58,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:58,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:15:58,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:15:58,001 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:58,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:58,141 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2021-05-02 13:15:58,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:15:58,141 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:15:58,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:58,142 INFO L225 Difference]: With dead ends: 34 [2021-05-02 13:15:58,143 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:15:58,144 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 88.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:15:58,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:15:58,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 21. [2021-05-02 13:15:58,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:58,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-05-02 13:15:58,153 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 11 [2021-05-02 13:15:58,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:58,153 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-05-02 13:15:58,153 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:58,153 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-05-02 13:15:58,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:15:58,154 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:58,154 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:58,154 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:15:58,154 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:58,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:58,155 INFO L82 PathProgramCache]: Analyzing trace with hash -699512288, now seen corresponding path program 1 times [2021-05-02 13:15:58,155 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:58,156 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731349905] [2021-05-02 13:15:58,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:58,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:58,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:58,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:58,219 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 13:15:58,219 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:58,220 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731349905] [2021-05-02 13:15:58,220 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731349905] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:15:58,220 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:15:58,220 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:15:58,220 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34713333] [2021-05-02 13:15:58,221 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:15:58,221 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:58,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:15:58,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:15:58,222 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:58,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:58,301 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-05-02 13:15:58,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:15:58,301 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 13:15:58,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:58,302 INFO L225 Difference]: With dead ends: 39 [2021-05-02 13:15:58,302 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 13:15:58,303 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:15:58,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 13:15:58,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2021-05-02 13:15:58,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:58,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-05-02 13:15:58,309 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 12 [2021-05-02 13:15:58,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:58,309 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-05-02 13:15:58,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:58,310 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-05-02 13:15:58,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 13:15:58,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:58,310 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:58,310 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:15:58,310 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:58,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:58,311 INFO L82 PathProgramCache]: Analyzing trace with hash -185588926, now seen corresponding path program 1 times [2021-05-02 13:15:58,311 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:58,311 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557826102] [2021-05-02 13:15:58,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:58,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:58,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:58,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:58,370 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 13:15:58,371 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:58,371 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557826102] [2021-05-02 13:15:58,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557826102] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:15:58,371 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:15:58,371 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:15:58,371 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943275611] [2021-05-02 13:15:58,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:15:58,372 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:58,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:15:58,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:15:58,373 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:58,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:58,442 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2021-05-02 13:15:58,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:15:58,443 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 13:15:58,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:58,444 INFO L225 Difference]: With dead ends: 39 [2021-05-02 13:15:58,444 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 13:15:58,445 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 40.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:15:58,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 13:15:58,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-05-02 13:15:58,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:58,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-05-02 13:15:58,452 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 13 [2021-05-02 13:15:58,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:58,452 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-05-02 13:15:58,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:58,452 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-05-02 13:15:58,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 13:15:58,453 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:58,453 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:58,453 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 13:15:58,453 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:58,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:58,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1431986846, now seen corresponding path program 1 times [2021-05-02 13:15:58,454 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:58,454 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432736334] [2021-05-02 13:15:58,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:58,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:58,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:58,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:58,556 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 13:15:58,557 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:58,557 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432736334] [2021-05-02 13:15:58,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432736334] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:58,557 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230783053] [2021-05-02 13:15:58,557 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 13:15:58,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:58,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:15:58,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:58,725 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 13:15:58,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230783053] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:58,726 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:58,726 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 13:15:58,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300671255] [2021-05-02 13:15:58,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:15:58,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:58,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:15:58,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:15:58,728 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:58,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:58,899 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2021-05-02 13:15:58,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:15:58,900 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 13:15:58,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:58,901 INFO L225 Difference]: With dead ends: 41 [2021-05-02 13:15:58,901 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 13:15:58,902 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 134.8ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:15:58,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 13:15:58,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-02 13:15:58,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:58,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-05-02 13:15:58,908 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 14 [2021-05-02 13:15:58,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:58,908 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-05-02 13:15:58,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:58,909 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-05-02 13:15:58,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 13:15:58,909 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:58,909 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:59,134 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:59,135 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:59,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:59,135 INFO L82 PathProgramCache]: Analyzing trace with hash -1415616702, now seen corresponding path program 2 times [2021-05-02 13:15:59,138 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:59,138 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318630033] [2021-05-02 13:15:59,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:59,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:59,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:59,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:59,269 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:59,269 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:59,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318630033] [2021-05-02 13:15:59,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [318630033] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:59,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668644718] [2021-05-02 13:15:59,270 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 13:15:59,315 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:15:59,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:59,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:15:59,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:59,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:59,442 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:59,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668644718] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:59,442 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:59,443 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:15:59,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172439467] [2021-05-02 13:15:59,443 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:15:59,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:59,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:15:59,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:15:59,445 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:59,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:59,650 INFO L93 Difference]: Finished difference Result 43 states and 52 transitions. [2021-05-02 13:15:59,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:15:59,651 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 13:15:59,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:59,652 INFO L225 Difference]: With dead ends: 43 [2021-05-02 13:15:59,652 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 13:15:59,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 146.1ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:15:59,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 13:15:59,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 13:15:59,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:59,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-05-02 13:15:59,665 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 15 [2021-05-02 13:15:59,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:59,665 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-05-02 13:15:59,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:59,666 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-05-02 13:15:59,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 13:15:59,666 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:59,666 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:59,888 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:59,889 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:59,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:59,889 INFO L82 PathProgramCache]: Analyzing trace with hash -908142238, now seen corresponding path program 3 times [2021-05-02 13:15:59,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:59,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430792453] [2021-05-02 13:15:59,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:59,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:00,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:00,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:00,050 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:00,050 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:00,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430792453] [2021-05-02 13:16:00,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1430792453] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:00,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852316571] [2021-05-02 13:16:00,051 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 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 13:16:00,118 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:16:00,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:00,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:16:00,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:00,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:00,229 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:00,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852316571] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:00,230 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:00,230 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 13:16:00,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205805371] [2021-05-02 13:16:00,231 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:16:00,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:00,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:16:00,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:16:00,233 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:00,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:00,467 INFO L93 Difference]: Finished difference Result 45 states and 54 transitions. [2021-05-02 13:16:00,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:16:00,467 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-02 13:16:00,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:00,468 INFO L225 Difference]: With dead ends: 45 [2021-05-02 13:16:00,468 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:16:00,469 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 207.7ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:16:00,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:16:00,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 13:16:00,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:00,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-05-02 13:16:00,475 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 16 [2021-05-02 13:16:00,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:00,476 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-05-02 13:16:00,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:00,476 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-05-02 13:16:00,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:16:00,476 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:00,476 INFO L523 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:00,699 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:00,700 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:00,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:00,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1938664258, now seen corresponding path program 4 times [2021-05-02 13:16:00,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:00,701 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026107140] [2021-05-02 13:16:00,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:00,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:00,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:00,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:00,797 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:00,798 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:00,798 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026107140] [2021-05-02 13:16:00,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026107140] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:00,798 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [482717655] [2021-05-02 13:16:00,798 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 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 13:16:00,855 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:16:00,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:00,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 13:16:00,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:00,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:00,921 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:00,921 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [482717655] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:00,921 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:00,922 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 13:16:00,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616709420] [2021-05-02 13:16:00,922 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:16:00,922 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:00,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:16:00,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:16:00,923 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:01,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:01,155 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2021-05-02 13:16:01,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:16:01,157 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:16:01,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:01,157 INFO L225 Difference]: With dead ends: 47 [2021-05-02 13:16:01,158 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 13:16:01,158 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 183.1ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:16:01,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 13:16:01,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 13:16:01,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:01,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-05-02 13:16:01,165 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 17 [2021-05-02 13:16:01,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:01,165 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-05-02 13:16:01,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:01,165 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-05-02 13:16:01,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 13:16:01,166 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:01,166 INFO L523 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:01,372 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:01,373 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:01,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:01,374 INFO L82 PathProgramCache]: Analyzing trace with hash -4647582, now seen corresponding path program 5 times [2021-05-02 13:16:01,374 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:01,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966448351] [2021-05-02 13:16:01,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:01,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:01,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:01,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:01,513 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:01,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:01,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966448351] [2021-05-02 13:16:01,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966448351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:01,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251033699] [2021-05-02 13:16:01,514 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 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 13:16:01,563 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 13:16:01,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:01,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 13:16:01,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:01,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:01,630 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:01,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251033699] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:01,631 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:01,631 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:16:01,631 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68328127] [2021-05-02 13:16:01,632 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:16:01,632 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:01,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:16:01,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:16:01,633 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:01,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:01,898 INFO L93 Difference]: Finished difference Result 49 states and 58 transitions. [2021-05-02 13:16:01,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:16:01,898 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 13:16:01,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:01,900 INFO L225 Difference]: With dead ends: 49 [2021-05-02 13:16:01,900 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 13:16:01,903 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 248.7ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:16:01,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 13:16:01,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-05-02 13:16:01,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.2) internal successors, (24), 21 states have internal predecessors, (24), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:01,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-05-02 13:16:01,914 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 18 [2021-05-02 13:16:01,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:01,915 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-05-02 13:16:01,915 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:01,915 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-05-02 13:16:01,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 13:16:01,915 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:01,916 INFO L523 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:02,141 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:02,141 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:02,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:02,141 INFO L82 PathProgramCache]: Analyzing trace with hash -117772478, now seen corresponding path program 6 times [2021-05-02 13:16:02,142 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:02,142 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424690543] [2021-05-02 13:16:02,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:02,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:02,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:02,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:02,262 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:02,262 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:02,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424690543] [2021-05-02 13:16:02,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1424690543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:02,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284413947] [2021-05-02 13:16:02,262 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 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 13:16:02,339 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:16:02,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:02,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:16:02,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:02,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:02,450 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:02,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284413947] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:02,451 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:02,451 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 13:16:02,453 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504556851] [2021-05-02 13:16:02,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:16:02,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:02,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:16:02,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:16:02,455 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:02,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:02,771 INFO L93 Difference]: Finished difference Result 51 states and 60 transitions. [2021-05-02 13:16:02,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:16:02,772 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 13:16:02,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:02,772 INFO L225 Difference]: With dead ends: 51 [2021-05-02 13:16:02,772 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 13:16:02,773 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 266.3ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:16:02,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 13:16:02,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-05-02 13:16:02,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 22 states have internal predecessors, (25), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:02,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-05-02 13:16:02,779 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 19 [2021-05-02 13:16:02,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:02,779 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-05-02 13:16:02,779 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:02,780 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-05-02 13:16:02,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 13:16:02,780 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:02,780 INFO L523 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:02,996 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:02,997 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:02,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:02,997 INFO L82 PathProgramCache]: Analyzing trace with hash 670323042, now seen corresponding path program 7 times [2021-05-02 13:16:02,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:02,998 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575106673] [2021-05-02 13:16:02,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:03,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:03,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:03,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:03,130 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:03,131 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:03,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575106673] [2021-05-02 13:16:03,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575106673] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:03,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316093806] [2021-05-02 13:16:03,131 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:16:03,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:03,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:16:03,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:03,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:03,276 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:03,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1316093806] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:03,277 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:03,277 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 13:16:03,277 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321153732] [2021-05-02 13:16:03,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:16:03,280 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:03,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:16:03,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:16:03,281 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 11 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:03,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:03,688 INFO L93 Difference]: Finished difference Result 53 states and 62 transitions. [2021-05-02 13:16:03,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:16:03,689 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 11 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 13:16:03,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:03,689 INFO L225 Difference]: With dead ends: 53 [2021-05-02 13:16:03,689 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 13:16:03,690 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 351.7ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:16:03,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 13:16:03,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2021-05-02 13:16:03,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 23 states have internal predecessors, (26), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:03,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-05-02 13:16:03,696 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2021-05-02 13:16:03,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:03,696 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-05-02 13:16:03,696 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 11 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:03,696 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-05-02 13:16:03,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:16:03,697 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:03,697 INFO L523 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:03,920 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:03,920 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:03,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:03,921 INFO L82 PathProgramCache]: Analyzing trace with hash -668519614, now seen corresponding path program 8 times [2021-05-02 13:16:03,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:03,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335130484] [2021-05-02 13:16:03,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:03,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:04,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:04,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:04,087 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:04,087 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:04,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335130484] [2021-05-02 13:16:04,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [335130484] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:04,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [296676824] [2021-05-02 13:16:04,088 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:04,137 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:04,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:04,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:16:04,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:04,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:04,208 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:04,208 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [296676824] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:04,209 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:04,209 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 13:16:04,209 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053462826] [2021-05-02 13:16:04,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:16:04,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:04,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:16:04,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:16:04,211 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:04,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:04,563 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2021-05-02 13:16:04,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:16:04,564 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 13:16:04,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:04,565 INFO L225 Difference]: With dead ends: 55 [2021-05-02 13:16:04,565 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 13:16:04,566 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 377.9ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:16:04,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 13:16:04,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 13:16:04,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:04,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-05-02 13:16:04,576 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 21 [2021-05-02 13:16:04,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:04,577 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-05-02 13:16:04,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:04,577 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-05-02 13:16:04,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:16:04,580 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:04,580 INFO L523 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:04,795 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 13:16:04,795 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:04,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:04,796 INFO L82 PathProgramCache]: Analyzing trace with hash 777031010, now seen corresponding path program 9 times [2021-05-02 13:16:04,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:04,796 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858046612] [2021-05-02 13:16:04,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:04,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:04,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:04,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:04,976 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:04,977 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:04,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858046612] [2021-05-02 13:16:04,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858046612] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:04,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901455353] [2021-05-02 13:16:04,977 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 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 13:16:05,112 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 13:16:05,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:05,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 13:16:05,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:05,214 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:05,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901455353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:05,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:05,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 13:16:05,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836505225] [2021-05-02 13:16:05,215 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:16:05,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:05,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:16:05,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:16:05,216 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 14 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:05,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:05,667 INFO L93 Difference]: Finished difference Result 57 states and 66 transitions. [2021-05-02 13:16:05,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:16:05,667 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 13:16:05,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:05,668 INFO L225 Difference]: With dead ends: 57 [2021-05-02 13:16:05,668 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 13:16:05,669 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 21 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 443.7ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:16:05,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 13:16:05,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-05-02 13:16:05,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 25 states have internal predecessors, (28), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:05,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-05-02 13:16:05,675 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 22 [2021-05-02 13:16:05,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:05,675 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-05-02 13:16:05,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:05,676 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-05-02 13:16:05,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 13:16:05,676 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:05,676 INFO L523 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:05,885 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:05,886 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:05,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:05,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1655539902, now seen corresponding path program 10 times [2021-05-02 13:16:05,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:05,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207575539] [2021-05-02 13:16:05,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:05,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:06,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:06,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:06,065 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:06,065 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:06,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207575539] [2021-05-02 13:16:06,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207575539] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:06,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990782065] [2021-05-02 13:16:06,066 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 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 13:16:06,114 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:16:06,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:06,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 13:16:06,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:06,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:06,185 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:06,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990782065] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:06,186 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:06,186 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 13:16:06,186 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943354379] [2021-05-02 13:16:06,187 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:16:06,187 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:06,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:16:06,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:16:06,187 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 14 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:06,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:06,630 INFO L93 Difference]: Finished difference Result 59 states and 68 transitions. [2021-05-02 13:16:06,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 13:16:06,630 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 14 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 13:16:06,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:06,631 INFO L225 Difference]: With dead ends: 59 [2021-05-02 13:16:06,631 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 13:16:06,632 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 449.3ms TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:16:06,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 13:16:06,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 13:16:06,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.16) internal successors, (29), 26 states have internal predecessors, (29), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:06,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2021-05-02 13:16:06,643 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 23 [2021-05-02 13:16:06,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:06,643 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2021-05-02 13:16:06,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 14 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:06,643 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2021-05-02 13:16:06,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 13:16:06,648 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:06,648 INFO L523 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:06,868 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:06,869 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:06,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:06,869 INFO L82 PathProgramCache]: Analyzing trace with hash 244173154, now seen corresponding path program 11 times [2021-05-02 13:16:06,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:06,870 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814712709] [2021-05-02 13:16:06,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:06,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:07,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:07,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:07,086 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:07,087 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:07,087 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814712709] [2021-05-02 13:16:07,087 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814712709] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:07,087 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718691196] [2021-05-02 13:16:07,087 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:16:07,208 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-02 13:16:07,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:07,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 13:16:07,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:07,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:07,419 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:07,420 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [718691196] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:07,420 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:07,420 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 13:16:07,420 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293759929] [2021-05-02 13:16:07,421 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:16:07,421 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:07,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:16:07,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:16:07,422 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 16 states, 16 states have (on average 1.4375) internal successors, (23), 15 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:07,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:07,942 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2021-05-02 13:16:07,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:16:07,942 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.4375) internal successors, (23), 15 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-02 13:16:07,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:07,943 INFO L225 Difference]: With dead ends: 61 [2021-05-02 13:16:07,943 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 13:16:07,944 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 17 SyntacticMatches, 10 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 572.7ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:16:07,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 13:16:07,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 13:16:07,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 27 states have internal predecessors, (30), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:07,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-05-02 13:16:07,950 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 24 [2021-05-02 13:16:07,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:07,950 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-05-02 13:16:07,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.4375) internal successors, (23), 15 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:07,950 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-05-02 13:16:07,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 13:16:07,951 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:07,951 INFO L523 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:08,166 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:16:08,166 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:08,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:08,167 INFO L82 PathProgramCache]: Analyzing trace with hash -994264254, now seen corresponding path program 12 times [2021-05-02 13:16:08,167 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:08,167 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169878194] [2021-05-02 13:16:08,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:08,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:08,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:08,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:08,362 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:08,362 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:08,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169878194] [2021-05-02 13:16:08,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169878194] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:08,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012682769] [2021-05-02 13:16:08,363 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 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 13:16:08,555 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 13:16:08,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:08,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 13:16:08,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:08,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:08,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:08,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:08,677 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:08,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012682769] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:08,677 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:08,677 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17] total 19 [2021-05-02 13:16:08,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219989071] [2021-05-02 13:16:08,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:16:08,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:08,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:16:08,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=294, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:16:08,679 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:09,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:09,279 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2021-05-02 13:16:09,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 13:16:09,279 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 13:16:09,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:09,280 INFO L225 Difference]: With dead ends: 63 [2021-05-02 13:16:09,280 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 13:16:09,281 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 605.3ms TimeCoverageRelationStatistics Valid=113, Invalid=879, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:16:09,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 13:16:09,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-05-02 13:16:09,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 28 states have internal predecessors, (31), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:09,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-05-02 13:16:09,285 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 25 [2021-05-02 13:16:09,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:09,285 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-05-02 13:16:09,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:09,285 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-05-02 13:16:09,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 13:16:09,285 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:09,286 INFO L523 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:09,489 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 13:16:09,489 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:09,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:09,489 INFO L82 PathProgramCache]: Analyzing trace with hash -731118238, now seen corresponding path program 13 times [2021-05-02 13:16:09,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:09,490 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079077377] [2021-05-02 13:16:09,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:09,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:09,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:09,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:09,722 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:09,723 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:09,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079077377] [2021-05-02 13:16:09,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079077377] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:09,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052381224] [2021-05-02 13:16:09,723 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:16:09,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:09,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:16:09,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:09,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:09,852 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:09,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052381224] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:09,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:09,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 13:16:09,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719931138] [2021-05-02 13:16:09,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:16:09,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:09,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:16:09,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:16:09,854 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 18 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:10,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:10,483 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2021-05-02 13:16:10,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:16:10,484 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 13:16:10,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:10,484 INFO L225 Difference]: With dead ends: 65 [2021-05-02 13:16:10,485 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 13:16:10,485 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 548.2ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:16:10,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 13:16:10,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2021-05-02 13:16:10,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 29 states have internal predecessors, (32), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:10,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-05-02 13:16:10,491 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 26 [2021-05-02 13:16:10,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:10,491 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-05-02 13:16:10,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:10,491 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-05-02 13:16:10,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:16:10,491 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:10,492 INFO L523 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:10,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 13:16:10,705 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:10,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:10,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1163526334, now seen corresponding path program 14 times [2021-05-02 13:16:10,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:10,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097188812] [2021-05-02 13:16:10,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:10,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:10,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:10,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:10,989 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:10,989 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:10,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097188812] [2021-05-02 13:16:10,989 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097188812] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:10,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [981052024] [2021-05-02 13:16:10,989 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:11,037 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:11,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:11,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:16:11,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:11,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:11,133 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:11,133 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [981052024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:11,133 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:11,133 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 13:16:11,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700522466] [2021-05-02 13:16:11,134 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:16:11,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:11,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:16:11,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:16:11,135 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:11,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:11,825 INFO L93 Difference]: Finished difference Result 67 states and 76 transitions. [2021-05-02 13:16:11,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 13:16:11,825 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 13:16:11,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:11,826 INFO L225 Difference]: With dead ends: 67 [2021-05-02 13:16:11,826 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 13:16:11,826 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 625.3ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:16:11,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 13:16:11,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-05-02 13:16:11,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:11,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-05-02 13:16:11,838 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 27 [2021-05-02 13:16:11,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:11,838 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-05-02 13:16:11,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:11,838 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-05-02 13:16:11,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 13:16:11,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:11,841 INFO L523 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:12,064 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:12,065 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:12,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:12,065 INFO L82 PathProgramCache]: Analyzing trace with hash -1683275422, now seen corresponding path program 15 times [2021-05-02 13:16:12,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:12,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153650747] [2021-05-02 13:16:12,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:12,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:12,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:12,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:12,353 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:12,353 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:12,353 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [153650747] [2021-05-02 13:16:12,354 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [153650747] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:12,354 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295813602] [2021-05-02 13:16:12,354 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:12,595 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-05-02 13:16:12,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:12,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 13:16:12,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:12,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:12,760 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:12,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295813602] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:12,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:12,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 13:16:12,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58256574] [2021-05-02 13:16:12,761 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 13:16:12,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:12,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 13:16:12,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:16:12,762 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 20 states, 20 states have (on average 1.35) internal successors, (27), 19 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:13,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:13,518 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2021-05-02 13:16:13,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:16:13,519 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 19 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 13:16:13,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:13,519 INFO L225 Difference]: With dead ends: 69 [2021-05-02 13:16:13,519 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 13:16:13,520 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 778.0ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:16:13,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 13:16:13,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-02 13:16:13,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 31 states have internal predecessors, (34), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:13,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-05-02 13:16:13,525 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 28 [2021-05-02 13:16:13,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:13,525 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-05-02 13:16:13,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 19 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:13,526 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-05-02 13:16:13,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 13:16:13,526 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:13,526 INFO L523 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:13,726 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:13,727 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:13,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:13,727 INFO L82 PathProgramCache]: Analyzing trace with hash -615627966, now seen corresponding path program 16 times [2021-05-02 13:16:13,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:13,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675306083] [2021-05-02 13:16:13,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:13,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:13,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:13,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:14,008 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:14,008 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:14,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675306083] [2021-05-02 13:16:14,009 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675306083] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:14,009 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356143988] [2021-05-02 13:16:14,009 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 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 13:16:14,068 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:16:14,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:14,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 13:16:14,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:14,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:14,178 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:14,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356143988] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:14,179 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:14,179 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 13:16:14,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115453663] [2021-05-02 13:16:14,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 13:16:14,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:14,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 13:16:14,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:16:14,180 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 21 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 20 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:14,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:14,965 INFO L93 Difference]: Finished difference Result 71 states and 80 transitions. [2021-05-02 13:16:14,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:16:14,965 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 20 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 13:16:14,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:14,966 INFO L225 Difference]: With dead ends: 71 [2021-05-02 13:16:14,966 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 13:16:14,967 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 738.4ms TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:16:14,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 13:16:14,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-05-02 13:16:14,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 32 states have internal predecessors, (35), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:14,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2021-05-02 13:16:14,972 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 29 [2021-05-02 13:16:14,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:14,972 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2021-05-02 13:16:14,972 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 20 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:14,973 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2021-05-02 13:16:14,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 13:16:14,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:14,973 INFO L523 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:15,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:15,181 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:15,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:15,181 INFO L82 PathProgramCache]: Analyzing trace with hash -1878295198, now seen corresponding path program 17 times [2021-05-02 13:16:15,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:15,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212469542] [2021-05-02 13:16:15,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:15,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:15,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:15,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:15,460 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:15,461 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:15,461 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212469542] [2021-05-02 13:16:15,461 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212469542] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:15,461 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778032294] [2021-05-02 13:16:15,461 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 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 13:16:15,891 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 13:16:15,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:15,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 13:16:15,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:16,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:16,147 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:16,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778032294] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:16,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:16,148 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 13:16:16,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081557887] [2021-05-02 13:16:16,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:16:16,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:16,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:16:16,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:16:16,149 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand has 22 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 21 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:16,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:16,934 INFO L93 Difference]: Finished difference Result 73 states and 82 transitions. [2021-05-02 13:16:16,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:16:16,934 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 21 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 13:16:16,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:16,935 INFO L225 Difference]: With dead ends: 73 [2021-05-02 13:16:16,935 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 13:16:16,936 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 19 SyntacticMatches, 14 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 918.0ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:16:16,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 13:16:16,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-05-02 13:16:16,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 32 states have (on average 1.125) internal successors, (36), 33 states have internal predecessors, (36), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:16,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-05-02 13:16:16,941 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 30 [2021-05-02 13:16:16,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:16,941 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-05-02 13:16:16,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 21 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:16,941 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-05-02 13:16:16,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 13:16:16,941 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:16,942 INFO L523 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:17,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 13:16:17,145 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:17,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:17,147 INFO L82 PathProgramCache]: Analyzing trace with hash 1928693570, now seen corresponding path program 18 times [2021-05-02 13:16:17,147 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:17,148 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875854568] [2021-05-02 13:16:17,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:17,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:17,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:17,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:17,478 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:17,478 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:17,478 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875854568] [2021-05-02 13:16:17,478 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1875854568] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:17,478 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63614670] [2021-05-02 13:16:17,479 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 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 13:16:17,653 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-05-02 13:16:17,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:17,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 13:16:17,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:17,829 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:17,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63614670] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:17,829 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:17,830 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 13:16:17,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302760158] [2021-05-02 13:16:17,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 13:16:17,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:17,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 13:16:17,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:16:17,831 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 22 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:18,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:18,676 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2021-05-02 13:16:18,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 13:16:18,677 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 22 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 13:16:18,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:18,677 INFO L225 Difference]: With dead ends: 75 [2021-05-02 13:16:18,677 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 13:16:18,678 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 27 SyntacticMatches, 7 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 912.3ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:16:18,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 13:16:18,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-02 13:16:18,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 33 states have (on average 1.121212121212121) internal successors, (37), 34 states have internal predecessors, (37), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:18,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2021-05-02 13:16:18,683 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 31 [2021-05-02 13:16:18,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:18,683 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2021-05-02 13:16:18,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 22 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:18,684 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2021-05-02 13:16:18,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:16:18,684 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:18,684 INFO L523 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:18,890 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 13:16:18,890 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:18,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:18,891 INFO L82 PathProgramCache]: Analyzing trace with hash -313738910, now seen corresponding path program 19 times [2021-05-02 13:16:18,891 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:18,891 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882062668] [2021-05-02 13:16:18,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:18,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:19,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:19,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:19,233 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:19,233 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:19,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882062668] [2021-05-02 13:16:19,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1882062668] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:19,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336877169] [2021-05-02 13:16:19,234 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:16:19,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:19,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 13:16:19,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:19,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:19,396 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:19,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336877169] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:19,396 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:19,396 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 13:16:19,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454451361] [2021-05-02 13:16:19,396 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:16:19,397 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:19,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:16:19,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:16:19,397 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:20,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:20,346 INFO L93 Difference]: Finished difference Result 77 states and 86 transitions. [2021-05-02 13:16:20,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:16:20,346 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 13:16:20,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:20,347 INFO L225 Difference]: With dead ends: 77 [2021-05-02 13:16:20,347 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 13:16:20,348 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 874.2ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 13:16:20,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 13:16:20,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-02 13:16:20,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 35 states have internal predecessors, (38), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:20,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-05-02 13:16:20,354 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 32 [2021-05-02 13:16:20,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:20,354 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-05-02 13:16:20,354 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:20,354 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-05-02 13:16:20,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 13:16:20,355 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:20,355 INFO L523 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:20,577 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 13:16:20,577 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:20,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:20,577 INFO L82 PathProgramCache]: Analyzing trace with hash -1109669054, now seen corresponding path program 20 times [2021-05-02 13:16:20,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:20,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1247958950] [2021-05-02 13:16:20,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:20,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:20,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:20,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:20,924 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:20,924 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:20,924 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1247958950] [2021-05-02 13:16:20,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1247958950] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:20,924 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582540819] [2021-05-02 13:16:20,924 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 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 13:16:20,963 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:20,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:20,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 13:16:20,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:21,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:21,074 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:21,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582540819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:21,074 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:21,074 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 13:16:21,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146692798] [2021-05-02 13:16:21,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:16:21,075 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:21,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:16:21,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:16:21,075 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:22,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:22,023 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2021-05-02 13:16:22,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:16:22,024 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 13:16:22,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:22,024 INFO L225 Difference]: With dead ends: 79 [2021-05-02 13:16:22,024 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 13:16:22,025 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 885.1ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:16:22,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 13:16:22,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-05-02 13:16:22,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 36 states have internal predecessors, (39), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:22,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2021-05-02 13:16:22,030 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 33 [2021-05-02 13:16:22,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:22,030 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2021-05-02 13:16:22,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:22,030 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2021-05-02 13:16:22,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:16:22,030 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:22,030 INFO L523 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:22,231 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 13:16:22,231 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:22,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:22,231 INFO L82 PathProgramCache]: Analyzing trace with hash -13699742, now seen corresponding path program 21 times [2021-05-02 13:16:22,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:22,232 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201526422] [2021-05-02 13:16:22,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:22,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:22,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:22,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:22,619 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:22,619 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:22,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201526422] [2021-05-02 13:16:22,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201526422] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:22,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593375307] [2021-05-02 13:16:22,619 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 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 13:16:22,893 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-05-02 13:16:22,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:22,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 13:16:22,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:23,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:23,059 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:23,059 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [593375307] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:23,059 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:23,059 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 13:16:23,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437933687] [2021-05-02 13:16:23,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:16:23,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:23,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:16:23,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:16:23,060 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 25 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:24,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:24,063 INFO L93 Difference]: Finished difference Result 81 states and 90 transitions. [2021-05-02 13:16:24,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 13:16:24,063 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 25 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 13:16:24,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:24,064 INFO L225 Difference]: With dead ends: 81 [2021-05-02 13:16:24,064 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 13:16:24,065 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 1027.8ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:16:24,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 13:16:24,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-05-02 13:16:24,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 37 states have internal predecessors, (40), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:24,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-05-02 13:16:24,070 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 34 [2021-05-02 13:16:24,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:24,070 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-05-02 13:16:24,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 25 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:24,071 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-05-02 13:16:24,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 13:16:24,071 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:24,071 INFO L523 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:24,275 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 13:16:24,275 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:24,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:24,276 INFO L82 PathProgramCache]: Analyzing trace with hash -398389438, now seen corresponding path program 22 times [2021-05-02 13:16:24,276 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:24,276 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564011328] [2021-05-02 13:16:24,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:24,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:24,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:24,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:24,733 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:24,733 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:24,733 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564011328] [2021-05-02 13:16:24,734 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564011328] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:24,734 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954685450] [2021-05-02 13:16:24,734 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 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 13:16:24,784 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:16:24,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:24,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 13:16:24,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:24,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:24,879 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:24,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954685450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:24,879 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:24,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-02 13:16:24,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517817480] [2021-05-02 13:16:24,880 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 13:16:24,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:24,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 13:16:24,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:16:24,881 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 27 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 26 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:25,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:25,952 INFO L93 Difference]: Finished difference Result 83 states and 92 transitions. [2021-05-02 13:16:25,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:16:25,952 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 26 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 13:16:25,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:25,953 INFO L225 Difference]: With dead ends: 83 [2021-05-02 13:16:25,953 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 13:16:25,954 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 1095.1ms TimeCoverageRelationStatistics Valid=189, Invalid=2261, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:16:25,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 13:16:25,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2021-05-02 13:16:25,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 38 states have internal predecessors, (41), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:25,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2021-05-02 13:16:25,962 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 35 [2021-05-02 13:16:25,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:25,962 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2021-05-02 13:16:25,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 26 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:25,962 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2021-05-02 13:16:25,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 13:16:25,963 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:25,963 INFO L523 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:26,163 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:26,163 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:26,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:26,164 INFO L82 PathProgramCache]: Analyzing trace with hash 561131874, now seen corresponding path program 23 times [2021-05-02 13:16:26,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:26,164 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486116659] [2021-05-02 13:16:26,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:26,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:26,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:26,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:26,569 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:26,569 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:26,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486116659] [2021-05-02 13:16:26,569 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486116659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:26,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147507983] [2021-05-02 13:16:26,570 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 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 13:16:27,213 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 13:16:27,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:27,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 13:16:27,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:27,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:27,635 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:27,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1147507983] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:27,635 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:27,635 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 13:16:27,636 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241482704] [2021-05-02 13:16:27,636 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:16:27,636 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:27,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:16:27,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:16:27,636 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:28,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:28,757 INFO L93 Difference]: Finished difference Result 85 states and 94 transitions. [2021-05-02 13:16:28,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:16:28,757 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 13:16:28,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:28,758 INFO L225 Difference]: With dead ends: 85 [2021-05-02 13:16:28,758 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 13:16:28,759 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 18 SyntacticMatches, 21 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 1374.3ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:16:28,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 13:16:28,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-02 13:16:28,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 38 states have (on average 1.105263157894737) internal successors, (42), 39 states have internal predecessors, (42), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:28,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-02 13:16:28,762 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 36 [2021-05-02 13:16:28,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:28,762 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-02 13:16:28,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:28,763 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-02 13:16:28,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 13:16:28,763 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:28,763 INFO L523 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:28,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 13:16:28,965 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:28,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:28,965 INFO L82 PathProgramCache]: Analyzing trace with hash 241521474, now seen corresponding path program 24 times [2021-05-02 13:16:28,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:28,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233436926] [2021-05-02 13:16:28,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:28,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:29,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:29,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:29,446 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:29,446 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:29,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233436926] [2021-05-02 13:16:29,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233436926] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:29,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277525366] [2021-05-02 13:16:29,447 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 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 13:16:30,024 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 13:16:30,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:30,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 13:16:30,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:30,122 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:30,122 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277525366] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:30,122 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:30,123 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 13:16:30,123 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64178503] [2021-05-02 13:16:30,123 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 13:16:30,123 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:30,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 13:16:30,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:16:30,124 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 28 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:31,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:31,361 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2021-05-02 13:16:31,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:16:31,362 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 28 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 13:16:31,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:31,363 INFO L225 Difference]: With dead ends: 87 [2021-05-02 13:16:31,363 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 13:16:31,364 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 1192.6ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 13:16:31,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 13:16:31,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2021-05-02 13:16:31,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 40 states have internal predecessors, (43), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:31,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2021-05-02 13:16:31,368 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 37 [2021-05-02 13:16:31,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:31,368 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2021-05-02 13:16:31,368 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 28 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:31,368 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2021-05-02 13:16:31,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:16:31,368 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:31,368 INFO L523 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:31,573 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 13:16:31,574 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:31,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:31,574 INFO L82 PathProgramCache]: Analyzing trace with hash -1076466334, now seen corresponding path program 25 times [2021-05-02 13:16:31,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:31,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453467597] [2021-05-02 13:16:31,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:31,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:32,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,029 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:32,029 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:32,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453467597] [2021-05-02 13:16:32,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453467597] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:32,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349744492] [2021-05-02 13:16:32,030 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:16:32,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:32,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 13:16:32,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:32,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:32,193 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:32,193 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [349744492] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:32,193 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:32,193 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 13:16:32,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191851701] [2021-05-02 13:16:32,193 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 13:16:32,194 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:32,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 13:16:32,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:16:32,195 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand has 30 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 29 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:33,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:33,466 INFO L93 Difference]: Finished difference Result 89 states and 98 transitions. [2021-05-02 13:16:33,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 13:16:33,466 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 29 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 13:16:33,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:33,467 INFO L225 Difference]: With dead ends: 89 [2021-05-02 13:16:33,467 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 13:16:33,468 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1225.5ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:16:33,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 13:16:33,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-05-02 13:16:33,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 40 states have (on average 1.1) internal successors, (44), 41 states have internal predecessors, (44), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:33,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2021-05-02 13:16:33,474 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 38 [2021-05-02 13:16:33,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:33,474 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2021-05-02 13:16:33,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 29 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:33,474 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2021-05-02 13:16:33,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 13:16:33,475 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:33,475 INFO L523 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:33,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:33,685 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:33,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:33,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1015584578, now seen corresponding path program 26 times [2021-05-02 13:16:33,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:33,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889871402] [2021-05-02 13:16:33,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:33,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:34,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:34,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:34,217 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:34,217 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:34,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889871402] [2021-05-02 13:16:34,218 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889871402] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:34,218 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332170873] [2021-05-02 13:16:34,218 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 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 13:16:34,260 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:34,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:34,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 13:16:34,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:34,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:34,367 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:34,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332170873] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:34,367 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:34,368 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 13:16:34,368 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770369124] [2021-05-02 13:16:34,369 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:16:34,369 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:34,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:16:34,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:16:34,369 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand has 31 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 30 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:35,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:35,690 INFO L93 Difference]: Finished difference Result 91 states and 100 transitions. [2021-05-02 13:16:35,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:16:35,690 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 30 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 13:16:35,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:35,692 INFO L225 Difference]: With dead ends: 91 [2021-05-02 13:16:35,693 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 13:16:35,694 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1362.0ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:16:35,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 13:16:35,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-02 13:16:35,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 41 states have (on average 1.0975609756097562) internal successors, (45), 42 states have internal predecessors, (45), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:35,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-05-02 13:16:35,700 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 39 [2021-05-02 13:16:35,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:35,700 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-05-02 13:16:35,700 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 30 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:35,700 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-05-02 13:16:35,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:16:35,700 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:35,700 INFO L523 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:35,901 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:35,901 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:35,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:35,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1444653410, now seen corresponding path program 27 times [2021-05-02 13:16:35,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:35,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190889979] [2021-05-02 13:16:35,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:35,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:36,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:36,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:36,413 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:36,413 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:36,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190889979] [2021-05-02 13:16:36,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190889979] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:36,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307192979] [2021-05-02 13:16:36,413 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 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 13:16:36,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-05-02 13:16:36,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:36,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 13:16:36,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:36,988 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:36,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307192979] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:36,988 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:36,988 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 13:16:36,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620248365] [2021-05-02 13:16:36,988 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 13:16:36,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:36,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 13:16:36,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:16:36,989 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 32 states, 32 states have (on average 1.21875) internal successors, (39), 31 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:38,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:38,473 INFO L93 Difference]: Finished difference Result 93 states and 102 transitions. [2021-05-02 13:16:38,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:16:38,474 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.21875) internal successors, (39), 31 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 13:16:38,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:38,474 INFO L225 Difference]: With dead ends: 93 [2021-05-02 13:16:38,474 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 13:16:38,475 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 35 SyntacticMatches, 8 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 1590.5ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 13:16:38,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 13:16:38,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-05-02 13:16:38,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 43 states have internal predecessors, (46), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:38,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-05-02 13:16:38,480 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 40 [2021-05-02 13:16:38,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:38,480 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-05-02 13:16:38,480 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.21875) internal successors, (39), 31 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:38,481 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-05-02 13:16:38,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 13:16:38,481 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:38,481 INFO L523 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:38,683 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-02 13:16:38,683 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:38,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:38,684 INFO L82 PathProgramCache]: Analyzing trace with hash 1860885314, now seen corresponding path program 28 times [2021-05-02 13:16:38,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:38,684 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49879306] [2021-05-02 13:16:38,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:38,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:39,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:39,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:39,282 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:39,282 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:39,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49879306] [2021-05-02 13:16:39,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49879306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:39,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582247630] [2021-05-02 13:16:39,283 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 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 13:16:39,340 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:16:39,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:39,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 13:16:39,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:39,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,438 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:39,438 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582247630] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:39,438 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:39,438 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-02 13:16:39,438 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949306798] [2021-05-02 13:16:39,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:16:39,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:39,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:16:39,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:16:39,439 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 33 states, 33 states have (on average 1.2121212121212122) internal successors, (40), 32 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:40,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:40,938 INFO L93 Difference]: Finished difference Result 95 states and 104 transitions. [2021-05-02 13:16:40,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 13:16:40,939 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.2121212121212122) internal successors, (40), 32 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 13:16:40,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:40,939 INFO L225 Difference]: With dead ends: 95 [2021-05-02 13:16:40,939 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 13:16:40,940 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 1491.3ms TimeCoverageRelationStatistics Valid=237, Invalid=3545, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 13:16:40,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 13:16:40,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 13:16:40,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 44 states have internal predecessors, (47), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:40,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2021-05-02 13:16:40,944 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 41 [2021-05-02 13:16:40,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:40,944 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2021-05-02 13:16:40,945 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.2121212121212122) internal successors, (40), 32 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:40,945 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2021-05-02 13:16:40,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:16:40,945 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:40,945 INFO L523 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:41,145 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:41,146 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:41,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:41,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1879172450, now seen corresponding path program 29 times [2021-05-02 13:16:41,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:41,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051713257] [2021-05-02 13:16:41,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:41,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:41,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:41,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:41,713 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:41,713 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:41,713 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051713257] [2021-05-02 13:16:41,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2051713257] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:41,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562917194] [2021-05-02 13:16:41,714 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 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 13:16:47,827 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2021-05-02 13:16:47,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:47,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 13:16:47,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:48,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:48,428 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:48,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562917194] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:48,428 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:48,428 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 13:16:48,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106089403] [2021-05-02 13:16:48,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:16:48,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:48,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:16:48,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:16:48,429 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand has 34 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 33 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:49,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:49,987 INFO L93 Difference]: Finished difference Result 97 states and 106 transitions. [2021-05-02 13:16:49,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 13:16:49,988 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 33 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 13:16:49,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:49,988 INFO L225 Difference]: With dead ends: 97 [2021-05-02 13:16:49,988 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 13:16:49,990 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 17 SyntacticMatches, 28 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 1985.3ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 13:16:49,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 13:16:49,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-02 13:16:49,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 45 states have internal predecessors, (48), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:49,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-02 13:16:49,996 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 42 [2021-05-02 13:16:49,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:49,996 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-02 13:16:49,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 33 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:49,996 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-02 13:16:49,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:16:49,997 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:49,997 INFO L523 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:50,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 13:16:50,201 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:50,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:50,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1848893630, now seen corresponding path program 30 times [2021-05-02 13:16:50,201 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:50,201 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621123578] [2021-05-02 13:16:50,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:50,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:50,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:50,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:50,888 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:50,888 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:50,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621123578] [2021-05-02 13:16:50,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621123578] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:50,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975952185] [2021-05-02 13:16:50,888 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 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 13:16:51,849 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2021-05-02 13:16:51,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:51,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-02 13:16:51,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:52,074 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:52,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [975952185] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:52,075 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:52,075 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 13:16:52,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235686590] [2021-05-02 13:16:52,075 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:16:52,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:52,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:16:52,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:16:52,076 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 35 states, 35 states have (on average 1.2) internal successors, (42), 34 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:53,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:53,594 INFO L93 Difference]: Finished difference Result 99 states and 108 transitions. [2021-05-02 13:16:53,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:16:53,594 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.2) internal successors, (42), 34 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 13:16:53,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:53,595 INFO L225 Difference]: With dead ends: 99 [2021-05-02 13:16:53,595 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 13:16:53,596 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 38 SyntacticMatches, 8 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 1792.2ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:16:53,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 13:16:53,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-02 13:16:53,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 46 states have internal predecessors, (49), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:53,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2021-05-02 13:16:53,601 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 43 [2021-05-02 13:16:53,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:53,601 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2021-05-02 13:16:53,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.2) internal successors, (42), 34 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:53,601 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2021-05-02 13:16:53,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:16:53,601 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:53,601 INFO L523 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:53,802 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:53,802 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:53,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:53,802 INFO L82 PathProgramCache]: Analyzing trace with hash -1454825118, now seen corresponding path program 31 times [2021-05-02 13:16:53,803 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:53,803 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1083506072] [2021-05-02 13:16:53,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:53,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:54,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:54,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:54,441 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:54,441 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:54,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1083506072] [2021-05-02 13:16:54,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1083506072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:54,442 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [825681454] [2021-05-02 13:16:54,442 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:16:54,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:54,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 13:16:54,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:54,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:54,637 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:54,637 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [825681454] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:54,637 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:54,638 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 13:16:54,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249524452] [2021-05-02 13:16:54,638 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 13:16:54,639 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:54,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 13:16:54,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:16:54,640 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand has 36 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 35 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:56,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:56,267 INFO L93 Difference]: Finished difference Result 101 states and 110 transitions. [2021-05-02 13:16:56,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 13:16:56,267 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 35 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 13:16:56,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:56,268 INFO L225 Difference]: With dead ends: 101 [2021-05-02 13:16:56,268 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 13:16:56,269 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1699.4ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 13:16:56,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 13:16:56,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-05-02 13:16:56,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 47 states have internal predecessors, (50), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:56,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2021-05-02 13:16:56,273 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 44 [2021-05-02 13:16:56,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:56,273 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2021-05-02 13:16:56,273 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 35 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:56,273 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2021-05-02 13:16:56,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:16:56,274 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:56,274 INFO L523 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:56,474 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 13:16:56,474 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:56,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:56,475 INFO L82 PathProgramCache]: Analyzing trace with hash -2123603134, now seen corresponding path program 32 times [2021-05-02 13:16:56,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:56,475 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485129589] [2021-05-02 13:16:56,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:56,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:57,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:57,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:57,224 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:57,224 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:57,224 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485129589] [2021-05-02 13:16:57,224 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1485129589] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:57,224 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79381341] [2021-05-02 13:16:57,224 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:57,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:57,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:57,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 13:16:57,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:57,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:57,410 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:57,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [79381341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:57,410 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:57,410 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 13:16:57,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654073341] [2021-05-02 13:16:57,411 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 13:16:57,411 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:57,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 13:16:57,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:16:57,412 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand has 37 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 36 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:59,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:59,285 INFO L93 Difference]: Finished difference Result 103 states and 112 transitions. [2021-05-02 13:16:59,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 13:16:59,285 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 36 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 13:16:59,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:59,285 INFO L225 Difference]: With dead ends: 103 [2021-05-02 13:16:59,285 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 13:16:59,286 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1973.0ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 13:16:59,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 13:16:59,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 13:16:59,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 48 states have internal predecessors, (51), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:16:59,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2021-05-02 13:16:59,291 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 45 [2021-05-02 13:16:59,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:59,292 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2021-05-02 13:16:59,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 36 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:59,292 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2021-05-02 13:16:59,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 13:16:59,292 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:59,292 INFO L523 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:59,497 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 13:16:59,497 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:59,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:59,497 INFO L82 PathProgramCache]: Analyzing trace with hash -1380885150, now seen corresponding path program 33 times [2021-05-02 13:16:59,497 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:59,497 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728318454] [2021-05-02 13:16:59,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:59,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:00,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:00,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:00,225 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:00,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:00,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728318454] [2021-05-02 13:17:00,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1728318454] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:00,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866017728] [2021-05-02 13:17:00,226 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:00,553 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-02 13:17:00,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:00,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 73 conjunts are in the unsatisfiable core [2021-05-02 13:17:00,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:00,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:00,783 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:00,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866017728] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:00,784 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:00,784 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 13:17:00,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727759460] [2021-05-02 13:17:00,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 13:17:00,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:00,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 13:17:00,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:17:00,785 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 38 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 37 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:02,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:02,748 INFO L93 Difference]: Finished difference Result 105 states and 114 transitions. [2021-05-02 13:17:02,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 13:17:02,749 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 37 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-02 13:17:02,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:02,750 INFO L225 Difference]: With dead ends: 105 [2021-05-02 13:17:02,750 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 13:17:02,750 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 571 ImplicationChecksByTransitivity, 1995.0ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 13:17:02,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 13:17:02,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-05-02 13:17:02,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 49 states have internal predecessors, (52), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:17:02,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2021-05-02 13:17:02,757 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 46 [2021-05-02 13:17:02,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:02,758 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2021-05-02 13:17:02,758 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 37 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:02,758 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2021-05-02 13:17:02,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 13:17:02,758 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:02,758 INFO L523 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:02,962 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 13:17:02,962 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:02,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:02,963 INFO L82 PathProgramCache]: Analyzing trace with hash 168535874, now seen corresponding path program 34 times [2021-05-02 13:17:02,963 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:02,963 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443429075] [2021-05-02 13:17:02,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:02,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:03,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:03,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:03,877 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:03,878 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:03,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443429075] [2021-05-02 13:17:03,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443429075] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:03,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308177596] [2021-05-02 13:17:03,878 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:03,942 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:17:03,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:03,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-02 13:17:03,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:04,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:04,067 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:04,067 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308177596] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:04,067 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:04,067 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-02 13:17:04,068 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046916670] [2021-05-02 13:17:04,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 13:17:04,068 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:04,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 13:17:04,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:17:04,069 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 39 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 38 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:06,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:06,123 INFO L93 Difference]: Finished difference Result 107 states and 116 transitions. [2021-05-02 13:17:06,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 13:17:06,124 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 38 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 13:17:06,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:06,124 INFO L225 Difference]: With dead ends: 107 [2021-05-02 13:17:06,124 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 13:17:06,125 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 2148.8ms TimeCoverageRelationStatistics Valid=285, Invalid=5117, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 13:17:06,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 13:17:06,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2021-05-02 13:17:06,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 50 states have internal predecessors, (53), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:17:06,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2021-05-02 13:17:06,132 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 47 [2021-05-02 13:17:06,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:06,132 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2021-05-02 13:17:06,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 38 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:06,132 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2021-05-02 13:17:06,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 13:17:06,133 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:06,133 INFO L523 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:06,333 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 13:17:06,333 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:06,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:06,334 INFO L82 PathProgramCache]: Analyzing trace with hash 955947362, now seen corresponding path program 35 times [2021-05-02 13:17:06,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:06,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027270241] [2021-05-02 13:17:06,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:06,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:07,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:07,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:07,098 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:07,098 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:07,098 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027270241] [2021-05-02 13:17:07,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027270241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:07,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658465366] [2021-05-02 13:17:07,099 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:15,623 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2021-05-02 13:17:15,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:15,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-02 13:17:15,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:16,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:16,317 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:16,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658465366] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:16,317 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:16,318 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-02 13:17:16,318 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524761636] [2021-05-02 13:17:16,318 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 13:17:16,318 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:16,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 13:17:16,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:17:16,319 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand has 40 states, 40 states have (on average 1.175) internal successors, (47), 39 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:18,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:18,445 INFO L93 Difference]: Finished difference Result 109 states and 118 transitions. [2021-05-02 13:17:18,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 13:17:18,446 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.175) internal successors, (47), 39 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2021-05-02 13:17:18,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:18,446 INFO L225 Difference]: With dead ends: 109 [2021-05-02 13:17:18,446 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 13:17:18,447 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 23 SyntacticMatches, 28 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 688 ImplicationChecksByTransitivity, 2596.4ms TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 13:17:18,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 13:17:18,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-02 13:17:18,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 50 states have (on average 1.08) internal successors, (54), 51 states have internal predecessors, (54), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:17:18,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2021-05-02 13:17:18,453 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 48 [2021-05-02 13:17:18,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:18,453 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2021-05-02 13:17:18,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.175) internal successors, (47), 39 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:18,453 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2021-05-02 13:17:18,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 13:17:18,454 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:18,454 INFO L523 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:18,660 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 13:17:18,660 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:18,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:18,661 INFO L82 PathProgramCache]: Analyzing trace with hash -404100286, now seen corresponding path program 36 times [2021-05-02 13:17:18,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:18,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [909646582] [2021-05-02 13:17:18,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:18,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:19,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:19,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:19,633 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:19,633 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:19,633 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [909646582] [2021-05-02 13:17:19,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [909646582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:19,633 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517862649] [2021-05-02 13:17:19,633 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:23,705 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 13:17:23,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:23,712 WARN L261 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-02 13:17:23,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:24,448 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:24,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [517862649] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:24,448 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:24,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 13:17:24,448 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827045886] [2021-05-02 13:17:24,449 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 13:17:24,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:24,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 13:17:24,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:17:24,449 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand has 41 states, 41 states have (on average 1.170731707317073) internal successors, (48), 40 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:26,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:26,676 INFO L93 Difference]: Finished difference Result 111 states and 120 transitions. [2021-05-02 13:17:26,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 13:17:26,676 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.170731707317073) internal successors, (48), 40 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 13:17:26,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:26,677 INFO L225 Difference]: With dead ends: 111 [2021-05-02 13:17:26,677 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 13:17:26,678 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 26 SyntacticMatches, 26 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 718 ImplicationChecksByTransitivity, 2949.4ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 13:17:26,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 13:17:26,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2021-05-02 13:17:26,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:17:26,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 63 transitions. [2021-05-02 13:17:26,685 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 63 transitions. Word has length 49 [2021-05-02 13:17:26,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:26,685 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 63 transitions. [2021-05-02 13:17:26,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.170731707317073) internal successors, (48), 40 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:26,685 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 63 transitions. [2021-05-02 13:17:26,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:17:26,685 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:26,685 INFO L523 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:26,888 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-05-02 13:17:26,889 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:26,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:26,889 INFO L82 PathProgramCache]: Analyzing trace with hash 384095586, now seen corresponding path program 37 times [2021-05-02 13:17:26,889 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:26,889 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186654896] [2021-05-02 13:17:26,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:26,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:27,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:27,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:27,860 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:27,860 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:27,860 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186654896] [2021-05-02 13:17:27,860 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186654896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:27,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002818316] [2021-05-02 13:17:27,861 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:27,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:27,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 13:17:27,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:28,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:28,049 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:28,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2002818316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:28,049 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:28,050 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-05-02 13:17:28,050 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559321865] [2021-05-02 13:17:28,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 13:17:28,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:28,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 13:17:28,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:17:28,051 INFO L87 Difference]: Start difference. First operand 59 states and 63 transitions. Second operand has 42 states, 42 states have (on average 1.1666666666666667) internal successors, (49), 41 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:30,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:30,320 INFO L93 Difference]: Finished difference Result 113 states and 122 transitions. [2021-05-02 13:17:30,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 13:17:30,320 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.1666666666666667) internal successors, (49), 41 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 13:17:30,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:30,321 INFO L225 Difference]: With dead ends: 113 [2021-05-02 13:17:30,321 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 13:17:30,322 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 2358.7ms TimeCoverageRelationStatistics Valid=309, Invalid=6011, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 13:17:30,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 13:17:30,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2021-05-02 13:17:30,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 52 states have (on average 1.0769230769230769) internal successors, (56), 53 states have internal predecessors, (56), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:17:30,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2021-05-02 13:17:30,328 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 50 [2021-05-02 13:17:30,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:30,329 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2021-05-02 13:17:30,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.1666666666666667) internal successors, (49), 41 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:30,329 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2021-05-02 13:17:30,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 13:17:30,329 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:30,329 INFO L523 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:30,544 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-05-02 13:17:30,544 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:30,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:30,544 INFO L82 PathProgramCache]: Analyzing trace with hash -951636158, now seen corresponding path program 38 times [2021-05-02 13:17:30,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:30,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743734167] [2021-05-02 13:17:30,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:30,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:31,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:31,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:31,559 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:31,559 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:31,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743734167] [2021-05-02 13:17:31,559 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1743734167] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:31,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1562820461] [2021-05-02 13:17:31,559 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:31,619 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:17:31,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:31,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 79 conjunts are in the unsatisfiable core [2021-05-02 13:17:31,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:31,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:31,757 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:31,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1562820461] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:31,758 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:31,758 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41] total 43 [2021-05-02 13:17:31,758 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004104794] [2021-05-02 13:17:31,758 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:17:31,758 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:31,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:17:31,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:17:31,759 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 43 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 42 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:34,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:34,294 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2021-05-02 13:17:34,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 13:17:34,295 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 42 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 13:17:34,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:34,295 INFO L225 Difference]: With dead ends: 115 [2021-05-02 13:17:34,295 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 13:17:34,296 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 2550.0ms TimeCoverageRelationStatistics Valid=317, Invalid=6325, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 13:17:34,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 13:17:34,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 13:17:34,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 53 states have (on average 1.0754716981132075) internal successors, (57), 54 states have internal predecessors, (57), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:17:34,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2021-05-02 13:17:34,302 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 51 [2021-05-02 13:17:34,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:34,302 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2021-05-02 13:17:34,302 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 42 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:34,302 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2021-05-02 13:17:34,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 13:17:34,302 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:34,303 INFO L523 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:34,503 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:34,503 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:34,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:34,504 INFO L82 PathProgramCache]: Analyzing trace with hash 590352738, now seen corresponding path program 39 times [2021-05-02 13:17:34,504 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:34,504 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136036125] [2021-05-02 13:17:34,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:34,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:35,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:35,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:35,402 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:35,402 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:35,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136036125] [2021-05-02 13:17:35,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136036125] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:35,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [997874028] [2021-05-02 13:17:35,403 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:36,992 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-05-02 13:17:36,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:36,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 13:17:36,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:37,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:37,607 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:37,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [997874028] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:37,607 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:37,607 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 13:17:37,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995443858] [2021-05-02 13:17:37,607 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 13:17:37,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:37,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 13:17:37,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 13:17:37,608 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand has 44 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 43 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:39,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:39,860 INFO L93 Difference]: Finished difference Result 117 states and 126 transitions. [2021-05-02 13:17:39,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 13:17:39,861 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 43 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-02 13:17:39,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:39,861 INFO L225 Difference]: With dead ends: 117 [2021-05-02 13:17:39,861 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 13:17:39,862 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 39 SyntacticMatches, 16 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 814 ImplicationChecksByTransitivity, 2832.2ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 13:17:39,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 13:17:39,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-05-02 13:17:39,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 55 states have internal predecessors, (58), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:17:39,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2021-05-02 13:17:39,869 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 52 [2021-05-02 13:17:39,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:39,869 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2021-05-02 13:17:39,869 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 43 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:39,869 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2021-05-02 13:17:39,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 13:17:39,869 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:39,869 INFO L523 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:40,072 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-05-02 13:17:40,073 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:40,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:40,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1147368258, now seen corresponding path program 40 times [2021-05-02 13:17:40,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:40,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105845101] [2021-05-02 13:17:40,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:40,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:41,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:41,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:41,036 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:41,036 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:41,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105845101] [2021-05-02 13:17:41,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105845101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:41,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958029431] [2021-05-02 13:17:41,036 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:41,087 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:17:41,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:41,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-02 13:17:41,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:41,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:41,213 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:41,213 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1958029431] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:41,213 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:41,213 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43] total 45 [2021-05-02 13:17:41,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310989938] [2021-05-02 13:17:41,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 13:17:41,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:41,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 13:17:41,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:17:41,214 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand has 45 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 44 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:43,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:43,801 INFO L93 Difference]: Finished difference Result 119 states and 128 transitions. [2021-05-02 13:17:43,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 13:17:43,802 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 44 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 13:17:43,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:43,803 INFO L225 Difference]: With dead ends: 119 [2021-05-02 13:17:43,803 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 13:17:43,803 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 2496.8ms TimeCoverageRelationStatistics Valid=333, Invalid=6977, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 13:17:43,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 13:17:43,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-02 13:17:43,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 56 states have internal predecessors, (59), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:17:43,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 67 transitions. [2021-05-02 13:17:43,808 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 67 transitions. Word has length 53 [2021-05-02 13:17:43,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:43,808 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 67 transitions. [2021-05-02 13:17:43,808 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 44 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:43,809 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 67 transitions. [2021-05-02 13:17:43,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 13:17:43,809 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:43,809 INFO L523 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:44,009 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:44,010 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:44,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:44,010 INFO L82 PathProgramCache]: Analyzing trace with hash 1234980194, now seen corresponding path program 41 times [2021-05-02 13:17:44,010 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:44,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411168918] [2021-05-02 13:17:44,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:44,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:45,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:45,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:45,074 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:17:45,074 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:45,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411168918] [2021-05-02 13:17:45,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411168918] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:45,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077898373] [2021-05-02 13:17:45,074 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:18:03,766 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2021-05-02 13:18:03,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:18:03,781 WARN L261 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 126 conjunts are in the unsatisfiable core [2021-05-02 13:18:03,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:18:04,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:18:04,973 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:18:04,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077898373] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:04,974 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:18:04,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-05-02 13:18:04,974 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364156170] [2021-05-02 13:18:04,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 13:18:04,974 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:18:04,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 13:18:04,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:18:04,975 INFO L87 Difference]: Start difference. First operand 63 states and 67 transitions. Second operand has 46 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 45 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:07,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:18:07,617 INFO L93 Difference]: Finished difference Result 121 states and 130 transitions. [2021-05-02 13:18:07,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 13:18:07,618 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 45 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-02 13:18:07,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:18:07,619 INFO L225 Difference]: With dead ends: 121 [2021-05-02 13:18:07,619 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 13:18:07,619 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 17 SyntacticMatches, 40 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 3681.1ms TimeCoverageRelationStatistics Valid=341, Invalid=7315, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 13:18:07,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 13:18:07,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-02 13:18:07,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 56 states have (on average 1.0714285714285714) internal successors, (60), 57 states have internal predecessors, (60), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:18:07,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2021-05-02 13:18:07,625 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 54 [2021-05-02 13:18:07,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:18:07,625 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2021-05-02 13:18:07,625 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 45 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:07,626 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2021-05-02 13:18:07,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 13:18:07,626 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:18:07,626 INFO L523 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:18:07,834 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 13:18:07,835 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:18:07,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:18:07,835 INFO L82 PathProgramCache]: Analyzing trace with hash -344017086, now seen corresponding path program 42 times [2021-05-02 13:18:07,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:18:07,835 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164861408] [2021-05-02 13:18:07,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:18:07,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:08,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:18:08,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:08,935 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:18:08,935 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:18:08,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164861408] [2021-05-02 13:18:08,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164861408] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:08,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367546488] [2021-05-02 13:18:08,935 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:18:15,480 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2021-05-02 13:18:15,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:18:15,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-02 13:18:15,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:18:15,990 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:18:15,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367546488] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:15,990 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:18:15,990 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 13:18:15,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117154866] [2021-05-02 13:18:15,991 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:18:15,991 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:18:15,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:18:15,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:18:15,991 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand has 47 states, 47 states have (on average 1.148936170212766) internal successors, (54), 46 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:18,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:18:18,839 INFO L93 Difference]: Finished difference Result 123 states and 132 transitions. [2021-05-02 13:18:18,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 13:18:18,849 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.148936170212766) internal successors, (54), 46 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 13:18:18,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:18:18,850 INFO L225 Difference]: With dead ends: 123 [2021-05-02 13:18:18,850 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 13:18:18,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 44 SyntacticMatches, 14 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 3179.9ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 13:18:18,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 13:18:18,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2021-05-02 13:18:18,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 58 states have internal predecessors, (61), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:18:18,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2021-05-02 13:18:18,857 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 55 [2021-05-02 13:18:18,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:18:18,857 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2021-05-02 13:18:18,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.148936170212766) internal successors, (54), 46 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:18,858 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2021-05-02 13:18:18,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:18:18,858 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:18:18,858 INFO L523 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:18:19,064 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:18:19,065 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:18:19,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:18:19,065 INFO L82 PathProgramCache]: Analyzing trace with hash -2048292510, now seen corresponding path program 43 times [2021-05-02 13:18:19,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:18:19,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913637772] [2021-05-02 13:18:19,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:18:19,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:20,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:18:20,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:20,432 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:18:20,433 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:18:20,433 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913637772] [2021-05-02 13:18:20,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913637772] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:20,433 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176022433] [2021-05-02 13:18:20,433 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:18:20,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:20,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 13:18:20,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:18:20,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:18:20,635 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:18:20,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1176022433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:20,635 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:18:20,635 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-02 13:18:20,635 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982187290] [2021-05-02 13:18:20,636 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 13:18:20,636 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:18:20,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 13:18:20,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:18:20,637 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand has 48 states, 48 states have (on average 1.1458333333333333) internal successors, (55), 47 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:23,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:18:23,643 INFO L93 Difference]: Finished difference Result 125 states and 134 transitions. [2021-05-02 13:18:23,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 13:18:23,643 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.1458333333333333) internal successors, (55), 47 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-02 13:18:23,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:18:23,644 INFO L225 Difference]: With dead ends: 125 [2021-05-02 13:18:23,644 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 13:18:23,645 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 3150.0ms TimeCoverageRelationStatistics Valid=357, Invalid=8015, Unknown=0, NotChecked=0, Total=8372 [2021-05-02 13:18:23,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 13:18:23,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2021-05-02 13:18:23,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 59 states have internal predecessors, (62), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:18:23,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2021-05-02 13:18:23,654 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 56 [2021-05-02 13:18:23,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:18:23,654 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2021-05-02 13:18:23,655 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.1458333333333333) internal successors, (55), 47 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:23,655 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2021-05-02 13:18:23,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:18:23,655 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:18:23,655 INFO L523 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:18:23,868 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 13:18:23,869 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:18:23,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:18:23,869 INFO L82 PathProgramCache]: Analyzing trace with hash 953744194, now seen corresponding path program 44 times [2021-05-02 13:18:23,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:18:23,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692812221] [2021-05-02 13:18:23,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:18:23,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:25,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:18:25,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:25,357 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:18:25,357 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:18:25,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692812221] [2021-05-02 13:18:25,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692812221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:25,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046577610] [2021-05-02 13:18:25,357 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:18:25,437 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:18:25,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:18:25,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 13:18:25,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:18:25,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:18:25,604 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:18:25,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2046577610] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:25,605 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:18:25,605 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 13:18:25,605 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616158137] [2021-05-02 13:18:25,605 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:18:25,605 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:18:25,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:18:25,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:18:25,606 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand has 49 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 48 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:28,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:18:28,603 INFO L93 Difference]: Finished difference Result 127 states and 136 transitions. [2021-05-02 13:18:28,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 13:18:28,604 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 48 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 13:18:28,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:18:28,604 INFO L225 Difference]: With dead ends: 127 [2021-05-02 13:18:28,604 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 13:18:28,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 3397.1ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 13:18:28,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 13:18:28,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-05-02 13:18:28,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 59 states have (on average 1.0677966101694916) internal successors, (63), 60 states have internal predecessors, (63), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:18:28,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 71 transitions. [2021-05-02 13:18:28,612 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 71 transitions. Word has length 57 [2021-05-02 13:18:28,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:18:28,612 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 71 transitions. [2021-05-02 13:18:28,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 48 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:28,612 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 71 transitions. [2021-05-02 13:18:28,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 13:18:28,612 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:18:28,612 INFO L523 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:18:28,812 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-02 13:18:28,813 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:18:28,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:18:28,813 INFO L82 PathProgramCache]: Analyzing trace with hash -472398494, now seen corresponding path program 45 times [2021-05-02 13:18:28,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:18:28,814 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836595301] [2021-05-02 13:18:28,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:18:28,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:30,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:18:30,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:30,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:18:30,028 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:18:30,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836595301] [2021-05-02 13:18:30,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836595301] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:30,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231781992] [2021-05-02 13:18:30,029 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:18:32,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-05-02 13:18:32,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:18:32,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-02 13:18:32,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:18:33,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:18:33,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:18:33,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231781992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:33,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:18:33,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 13:18:33,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173077086] [2021-05-02 13:18:33,182 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 13:18:33,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:18:33,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 13:18:33,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:18:33,182 INFO L87 Difference]: Start difference. First operand 67 states and 71 transitions. Second operand has 50 states, 50 states have (on average 1.14) internal successors, (57), 49 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:36,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:18:36,494 INFO L93 Difference]: Finished difference Result 129 states and 138 transitions. [2021-05-02 13:18:36,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 13:18:36,495 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.14) internal successors, (57), 49 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-02 13:18:36,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:18:36,495 INFO L225 Difference]: With dead ends: 129 [2021-05-02 13:18:36,495 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 13:18:36,496 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 48 SyntacticMatches, 13 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1063 ImplicationChecksByTransitivity, 3752.4ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 13:18:36,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 13:18:36,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-05-02 13:18:36,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 61 states have internal predecessors, (64), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:18:36,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2021-05-02 13:18:36,505 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 58 [2021-05-02 13:18:36,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:18:36,505 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2021-05-02 13:18:36,505 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.14) internal successors, (57), 49 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:36,505 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2021-05-02 13:18:36,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:18:36,506 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:18:36,506 INFO L523 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:18:36,711 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 13:18:36,712 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:18:36,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:18:36,712 INFO L82 PathProgramCache]: Analyzing trace with hash -1733148862, now seen corresponding path program 46 times [2021-05-02 13:18:36,712 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:18:36,712 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566433203] [2021-05-02 13:18:36,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:18:36,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:37,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:18:37,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:37,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:18:37,992 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:18:37,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566433203] [2021-05-02 13:18:37,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1566433203] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:37,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1726637146] [2021-05-02 13:18:37,993 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:18:38,048 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:18:38,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:18:38,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 95 conjunts are in the unsatisfiable core [2021-05-02 13:18:38,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:18:38,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:18:38,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:18:38,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1726637146] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:38,209 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:18:38,209 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49] total 51 [2021-05-02 13:18:38,209 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958064973] [2021-05-02 13:18:38,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 13:18:38,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:18:38,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 13:18:38,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:18:38,210 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand has 51 states, 51 states have (on average 1.1372549019607843) internal successors, (58), 50 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:41,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:18:41,423 INFO L93 Difference]: Finished difference Result 131 states and 140 transitions. [2021-05-02 13:18:41,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 13:18:41,423 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.1372549019607843) internal successors, (58), 50 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 13:18:41,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:18:41,424 INFO L225 Difference]: With dead ends: 131 [2021-05-02 13:18:41,424 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 13:18:41,424 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 3266.8ms TimeCoverageRelationStatistics Valid=381, Invalid=9125, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 13:18:41,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 13:18:41,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2021-05-02 13:18:41,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 61 states have (on average 1.0655737704918034) internal successors, (65), 62 states have internal predecessors, (65), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:18:41,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 73 transitions. [2021-05-02 13:18:41,430 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 73 transitions. Word has length 59 [2021-05-02 13:18:41,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:18:41,430 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 73 transitions. [2021-05-02 13:18:41,430 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.1372549019607843) internal successors, (58), 50 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:41,430 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 73 transitions. [2021-05-02 13:18:41,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 13:18:41,431 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:18:41,431 INFO L523 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:18:41,642 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2021-05-02 13:18:41,642 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:18:41,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:18:41,643 INFO L82 PathProgramCache]: Analyzing trace with hash 2133262690, now seen corresponding path program 47 times [2021-05-02 13:18:41,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:18:41,643 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188992326] [2021-05-02 13:18:41,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:18:41,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:42,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:18:42,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:42,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:18:42,900 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:18:42,900 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188992326] [2021-05-02 13:18:42,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [188992326] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:42,900 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738062366] [2021-05-02 13:18:42,901 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:41,870 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 13:19:41,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:19:41,883 WARN L261 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 139 conjunts are in the unsatisfiable core [2021-05-02 13:19:41,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:43,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:43,140 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:43,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1738062366] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:43,141 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:43,141 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 13:19:43,141 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338337321] [2021-05-02 13:19:43,141 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 13:19:43,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:43,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 13:19:43,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:19:43,142 INFO L87 Difference]: Start difference. First operand 69 states and 73 transitions. Second operand has 52 states, 52 states have (on average 1.1346153846153846) internal successors, (59), 51 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:46,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:46,639 INFO L93 Difference]: Finished difference Result 133 states and 142 transitions. [2021-05-02 13:19:46,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 13:19:46,644 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.1346153846153846) internal successors, (59), 51 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2021-05-02 13:19:46,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:46,645 INFO L225 Difference]: With dead ends: 133 [2021-05-02 13:19:46,645 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 13:19:46,646 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 22 SyntacticMatches, 41 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1212 ImplicationChecksByTransitivity, 4381.4ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 13:19:46,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 13:19:46,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2021-05-02 13:19:46,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 62 states have (on average 1.064516129032258) internal successors, (66), 63 states have internal predecessors, (66), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:19:46,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2021-05-02 13:19:46,654 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 60 [2021-05-02 13:19:46,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:46,654 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2021-05-02 13:19:46,654 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 1.1346153846153846) internal successors, (59), 51 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:46,654 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2021-05-02 13:19:46,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 13:19:46,655 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:46,655 INFO L523 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:46,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:46,864 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:46,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:46,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1732936514, now seen corresponding path program 48 times [2021-05-02 13:19:46,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:46,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1898314672] [2021-05-02 13:19:46,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:46,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:48,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:48,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:48,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:48,263 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:48,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1898314672] [2021-05-02 13:19:48,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1898314672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:48,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1551991431] [2021-05-02 13:19:48,263 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:53,684 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 13:19:53,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:19:53,693 WARN L261 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 130 conjunts are in the unsatisfiable core [2021-05-02 13:19:53,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:54,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:54,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:54,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1551991431] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:54,952 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:54,952 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 13:19:54,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313831107] [2021-05-02 13:19:54,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 13:19:54,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:54,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 13:19:54,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 13:19:54,953 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:58,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:58,492 INFO L93 Difference]: Finished difference Result 135 states and 144 transitions. [2021-05-02 13:19:58,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 13:19:58,492 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-02 13:19:58,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:58,493 INFO L225 Difference]: With dead ends: 135 [2021-05-02 13:19:58,493 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 13:19:58,494 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 33 SyntacticMatches, 31 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1240 ImplicationChecksByTransitivity, 4676.9ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 13:19:58,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 13:19:58,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2021-05-02 13:19:58,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 64 states have internal predecessors, (67), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:19:58,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 75 transitions. [2021-05-02 13:19:58,500 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 75 transitions. Word has length 61 [2021-05-02 13:19:58,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:58,500 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 75 transitions. [2021-05-02 13:19:58,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:58,501 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 75 transitions. [2021-05-02 13:19:58,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 13:19:58,501 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:58,501 INFO L523 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:58,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,49 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:58,705 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:58,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:58,705 INFO L82 PathProgramCache]: Analyzing trace with hash -2087240350, now seen corresponding path program 49 times [2021-05-02 13:19:58,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:58,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876120847] [2021-05-02 13:19:58,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:58,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:00,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:20:00,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:00,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:20:00,092 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:20:00,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876120847] [2021-05-02 13:20:00,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876120847] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:00,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298043736] [2021-05-02 13:20:00,093 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:20:00,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:00,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 13:20:00,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:20:00,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:20:00,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:20:00,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298043736] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:00,297 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:20:00,297 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-05-02 13:20:00,297 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327591504] [2021-05-02 13:20:00,297 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 13:20:00,297 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:20:00,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 13:20:00,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 13:20:00,298 INFO L87 Difference]: Start difference. First operand 71 states and 75 transitions. Second operand has 54 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 53 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:20:03,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:20:03,970 INFO L93 Difference]: Finished difference Result 137 states and 146 transitions. [2021-05-02 13:20:03,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 13:20:03,971 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 53 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 13:20:03,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:20:03,971 INFO L225 Difference]: With dead ends: 137 [2021-05-02 13:20:03,971 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 13:20:03,972 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1229 ImplicationChecksByTransitivity, 3556.2ms TimeCoverageRelationStatistics Valid=405, Invalid=10307, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 13:20:03,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 13:20:03,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2021-05-02 13:20:03,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 64 states have (on average 1.0625) internal successors, (68), 65 states have internal predecessors, (68), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:20:03,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2021-05-02 13:20:03,980 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 62 [2021-05-02 13:20:03,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:20:03,980 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2021-05-02 13:20:03,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 53 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:20:03,981 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2021-05-02 13:20:03,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 13:20:03,981 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:20:03,981 INFO L523 BasicCegarLoop]: trace histogram [50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:20:04,188 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-05-02 13:20:04,189 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:20:04,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:20:04,189 INFO L82 PathProgramCache]: Analyzing trace with hash -253638846, now seen corresponding path program 50 times [2021-05-02 13:20:04,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:20:04,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133198722] [2021-05-02 13:20:04,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:20:04,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:05,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:20:05,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:05,716 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:20:05,717 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:20:05,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133198722] [2021-05-02 13:20:05,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [133198722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:05,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499628621] [2021-05-02 13:20:05,717 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:20:05,770 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:20:05,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:20:05,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 13:20:05,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:20:05,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:20:05,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:20:05,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499628621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:05,940 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:20:05,940 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53] total 55 [2021-05-02 13:20:05,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702465254] [2021-05-02 13:20:05,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 13:20:05,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:20:05,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 13:20:05,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 13:20:05,941 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand has 55 states, 55 states have (on average 1.1272727272727272) internal successors, (62), 54 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:20:09,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:20:09,747 INFO L93 Difference]: Finished difference Result 139 states and 148 transitions. [2021-05-02 13:20:09,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 13:20:09,748 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.1272727272727272) internal successors, (62), 54 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-02 13:20:09,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:20:09,748 INFO L225 Difference]: With dead ends: 139 [2021-05-02 13:20:09,748 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 13:20:09,749 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 3765.2ms TimeCoverageRelationStatistics Valid=413, Invalid=10717, Unknown=0, NotChecked=0, Total=11130 [2021-05-02 13:20:09,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 13:20:09,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-02 13:20:09,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 65 states have (on average 1.0615384615384615) internal successors, (69), 66 states have internal predecessors, (69), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:20:09,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 77 transitions. [2021-05-02 13:20:09,758 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 77 transitions. Word has length 63 [2021-05-02 13:20:09,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:20:09,758 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 77 transitions. [2021-05-02 13:20:09,758 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 1.1272727272727272) internal successors, (62), 54 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:20:09,758 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 77 transitions. [2021-05-02 13:20:09,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-02 13:20:09,758 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:20:09,759 INFO L523 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:20:09,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:20:09,965 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:20:09,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:20:09,965 INFO L82 PathProgramCache]: Analyzing trace with hash 753432930, now seen corresponding path program 51 times [2021-05-02 13:20:09,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:20:09,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018454126] [2021-05-02 13:20:09,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:20:09,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:11,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:20:11,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:11,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:20:11,515 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:20:11,515 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018454126] [2021-05-02 13:20:11,515 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018454126] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:11,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099662660] [2021-05-02 13:20:11,516 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:20:13,628 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2021-05-02 13:20:13,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:20:13,633 WARN L261 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 128 conjunts are in the unsatisfiable core [2021-05-02 13:20:13,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:20:14,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:20:14,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2099662660] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:14,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:20:14,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-02 13:20:14,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838999427] [2021-05-02 13:20:14,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 13:20:14,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:20:14,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 13:20:14,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:20:14,615 INFO L87 Difference]: Start difference. First operand 73 states and 77 transitions. Second operand has 56 states, 56 states have (on average 1.125) internal successors, (63), 55 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:20:18,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:20:18,753 INFO L93 Difference]: Finished difference Result 141 states and 150 transitions. [2021-05-02 13:20:18,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 13:20:18,754 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.125) internal successors, (63), 55 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 64 [2021-05-02 13:20:18,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:20:18,754 INFO L225 Difference]: With dead ends: 141 [2021-05-02 13:20:18,759 INFO L226 Difference]: Without dead ends: 75 [2021-05-02 13:20:18,760 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 49 SyntacticMatches, 18 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1362 ImplicationChecksByTransitivity, 4818.6ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 13:20:18,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-02 13:20:18,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2021-05-02 13:20:18,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 67 states have internal predecessors, (70), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:20:18,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 78 transitions. [2021-05-02 13:20:18,765 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 78 transitions. Word has length 64 [2021-05-02 13:20:18,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:20:18,766 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 78 transitions. [2021-05-02 13:20:18,766 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 1.125) internal successors, (63), 55 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:20:18,766 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 78 transitions. [2021-05-02 13:20:18,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 13:20:18,766 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:20:18,766 INFO L523 BasicCegarLoop]: trace histogram [52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:20:18,968 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-02 13:20:18,969 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:20:18,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:20:18,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1907886914, now seen corresponding path program 52 times [2021-05-02 13:20:18,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:20:18,969 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598480360] [2021-05-02 13:20:18,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:20:18,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:20,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:20:20,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:20,724 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:20:20,724 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:20:20,724 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598480360] [2021-05-02 13:20:20,724 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1598480360] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:20,724 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258645399] [2021-05-02 13:20:20,724 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:20:20,781 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:20:20,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:20:20,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-02 13:20:20,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:20:20,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:20:20,963 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:20:20,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [258645399] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:20,963 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:20:20,963 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55] total 57 [2021-05-02 13:20:20,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310380554] [2021-05-02 13:20:20,964 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 13:20:20,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:20:20,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 13:20:20,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3028, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 13:20:20,964 INFO L87 Difference]: Start difference. First operand 74 states and 78 transitions. Second operand has 57 states, 57 states have (on average 1.1228070175438596) internal successors, (64), 56 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:20:25,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:20:25,262 INFO L93 Difference]: Finished difference Result 143 states and 152 transitions. [2021-05-02 13:20:25,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 13:20:25,263 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.1228070175438596) internal successors, (64), 56 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 13:20:25,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:20:25,263 INFO L225 Difference]: With dead ends: 143 [2021-05-02 13:20:25,263 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 13:20:25,264 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1382 ImplicationChecksByTransitivity, 4321.2ms TimeCoverageRelationStatistics Valid=429, Invalid=11561, Unknown=0, NotChecked=0, Total=11990 [2021-05-02 13:20:25,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 13:20:25,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-02 13:20:25,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 67 states have (on average 1.0597014925373134) internal successors, (71), 68 states have internal predecessors, (71), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:20:25,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2021-05-02 13:20:25,273 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 65 [2021-05-02 13:20:25,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:20:25,274 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2021-05-02 13:20:25,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 1.1228070175438596) internal successors, (64), 56 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:20:25,274 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2021-05-02 13:20:25,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-02 13:20:25,274 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:20:25,274 INFO L523 BasicCegarLoop]: trace histogram [53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:20:25,499 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-05-02 13:20:25,499 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:20:25,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:20:25,500 INFO L82 PathProgramCache]: Analyzing trace with hash -958745246, now seen corresponding path program 53 times [2021-05-02 13:20:25,500 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:20:25,500 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178602502] [2021-05-02 13:20:25,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:20:25,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:27,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:20:27,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:27,196 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:20:27,196 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:20:27,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178602502] [2021-05-02 13:20:27,197 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [178602502] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:27,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850679100] [2021-05-02 13:20:27,197 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:21:35,571 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2021-05-02 13:21:35,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:21:35,590 WARN L261 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 162 conjunts are in the unsatisfiable core [2021-05-02 13:21:35,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:21:37,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:21:37,380 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:21:37,380 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1850679100] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:21:37,380 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:21:37,380 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56] total 58 [2021-05-02 13:21:37,381 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544773207] [2021-05-02 13:21:37,381 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 13:21:37,381 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:21:37,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 13:21:37,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3139, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:21:37,381 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand has 58 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 57 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:21:41,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:21:41,540 INFO L93 Difference]: Finished difference Result 145 states and 154 transitions. [2021-05-02 13:21:41,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 13:21:41,540 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 57 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 66 [2021-05-02 13:21:41,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:21:41,541 INFO L225 Difference]: With dead ends: 145 [2021-05-02 13:21:41,541 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 13:21:41,542 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 17 SyntacticMatches, 52 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1537 ImplicationChecksByTransitivity, 5766.0ms TimeCoverageRelationStatistics Valid=437, Invalid=11995, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 13:21:41,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 13:21:41,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2021-05-02 13:21:41,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 68 states have (on average 1.0588235294117647) internal successors, (72), 69 states have internal predecessors, (72), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:21:41,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2021-05-02 13:21:41,548 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 66 [2021-05-02 13:21:41,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:21:41,548 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2021-05-02 13:21:41,548 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 57 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:21:41,548 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2021-05-02 13:21:41,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 13:21:41,548 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:21:41,548 INFO L523 BasicCegarLoop]: trace histogram [54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:21:41,749 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-02 13:21:41,749 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:21:41,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:21:41,749 INFO L82 PathProgramCache]: Analyzing trace with hash 369971010, now seen corresponding path program 54 times [2021-05-02 13:21:41,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:21:41,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349858722] [2021-05-02 13:21:41,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:21:41,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:43,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:21:43,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:43,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:21:43,374 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:21:43,375 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349858722] [2021-05-02 13:21:43,375 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349858722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:21:43,375 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074506049] [2021-05-02 13:21:43,375 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:21:52,462 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2021-05-02 13:21:52,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:21:52,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 120 conjunts are in the unsatisfiable core [2021-05-02 13:21:52,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:21:52,770 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:21:52,771 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1074506049] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:21:52,771 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:21:52,771 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57] total 59 [2021-05-02 13:21:52,771 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4620957] [2021-05-02 13:21:52,771 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 13:21:52,771 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:21:52,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 13:21:52,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3252, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:21:52,772 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 59 states, 59 states have (on average 1.11864406779661) internal successors, (66), 58 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:21:57,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:21:57,090 INFO L93 Difference]: Finished difference Result 147 states and 156 transitions. [2021-05-02 13:21:57,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 13:21:57,091 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.11864406779661) internal successors, (66), 58 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-02 13:21:57,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:21:57,091 INFO L225 Difference]: With dead ends: 147 [2021-05-02 13:21:57,091 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 13:21:57,092 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 66 SyntacticMatches, 4 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1493 ImplicationChecksByTransitivity, 4277.7ms TimeCoverageRelationStatistics Valid=445, Invalid=12437, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 13:21:57,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 13:21:57,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2021-05-02 13:21:57,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 69 states have (on average 1.0579710144927537) internal successors, (73), 70 states have internal predecessors, (73), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:21:57,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 81 transitions. [2021-05-02 13:21:57,101 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 81 transitions. Word has length 67 [2021-05-02 13:21:57,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:21:57,101 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 81 transitions. [2021-05-02 13:21:57,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 1.11864406779661) internal successors, (66), 58 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:21:57,101 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 81 transitions. [2021-05-02 13:21:57,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 13:21:57,102 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:21:57,102 INFO L523 BasicCegarLoop]: trace histogram [55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:21:57,307 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-05-02 13:21:57,308 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:21:57,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:21:57,308 INFO L82 PathProgramCache]: Analyzing trace with hash -1389498014, now seen corresponding path program 55 times [2021-05-02 13:21:57,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:21:57,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557562088] [2021-05-02 13:21:57,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:21:57,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:58,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:21:58,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:59,001 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:21:59,001 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:21:59,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557562088] [2021-05-02 13:21:59,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [557562088] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:21:59,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291146489] [2021-05-02 13:21:59,001 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:21:59,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:59,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 113 conjunts are in the unsatisfiable core [2021-05-02 13:21:59,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:21:59,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:21:59,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:21:59,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291146489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:21:59,226 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:21:59,226 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58] total 60 [2021-05-02 13:21:59,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761288594] [2021-05-02 13:21:59,226 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 13:21:59,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:21:59,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 13:21:59,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3367, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 13:21:59,227 INFO L87 Difference]: Start difference. First operand 77 states and 81 transitions. Second operand has 60 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 59 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:22:03,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:22:03,676 INFO L93 Difference]: Finished difference Result 149 states and 158 transitions. [2021-05-02 13:22:03,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 13:22:03,677 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 59 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2021-05-02 13:22:03,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:22:03,677 INFO L225 Difference]: With dead ends: 149 [2021-05-02 13:22:03,677 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 13:22:03,678 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1544 ImplicationChecksByTransitivity, 4276.4ms TimeCoverageRelationStatistics Valid=453, Invalid=12887, Unknown=0, NotChecked=0, Total=13340 [2021-05-02 13:22:03,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 13:22:03,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2021-05-02 13:22:03,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 71 states have internal predecessors, (74), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:22:03,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2021-05-02 13:22:03,700 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 68 [2021-05-02 13:22:03,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:22:03,701 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2021-05-02 13:22:03,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 59 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:22:03,701 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2021-05-02 13:22:03,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 13:22:03,701 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:22:03,701 INFO L523 BasicCegarLoop]: trace histogram [56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:22:03,932 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-02 13:22:03,933 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:22:03,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:22:03,933 INFO L82 PathProgramCache]: Analyzing trace with hash -98462910, now seen corresponding path program 56 times [2021-05-02 13:22:03,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:22:03,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585472687] [2021-05-02 13:22:03,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:22:03,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:05,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:22:05,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:05,719 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:22:05,719 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:22:05,719 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585472687] [2021-05-02 13:22:05,719 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [585472687] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:22:05,719 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514604633] [2021-05-02 13:22:05,719 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:22:05,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:22:05,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:22:05,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 115 conjunts are in the unsatisfiable core [2021-05-02 13:22:05,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:22:05,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:22:05,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:22:05,957 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [514604633] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:22:05,957 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:22:05,957 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 59] total 61 [2021-05-02 13:22:05,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396708954] [2021-05-02 13:22:05,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 13:22:05,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:22:05,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 13:22:05,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=3484, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 13:22:05,958 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:22:10,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:22:10,141 INFO L93 Difference]: Finished difference Result 151 states and 160 transitions. [2021-05-02 13:22:10,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-02 13:22:10,141 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-02 13:22:10,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:22:10,142 INFO L225 Difference]: With dead ends: 151 [2021-05-02 13:22:10,142 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 13:22:10,143 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1600 ImplicationChecksByTransitivity, 4408.0ms TimeCoverageRelationStatistics Valid=461, Invalid=13345, Unknown=0, NotChecked=0, Total=13806 [2021-05-02 13:22:10,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 13:22:10,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-05-02 13:22:10,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 71 states have (on average 1.056338028169014) internal successors, (75), 72 states have internal predecessors, (75), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:22:10,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 83 transitions. [2021-05-02 13:22:10,150 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 83 transitions. Word has length 69 [2021-05-02 13:22:10,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:22:10,150 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 83 transitions. [2021-05-02 13:22:10,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:22:10,151 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 83 transitions. [2021-05-02 13:22:10,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-02 13:22:10,151 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:22:10,151 INFO L523 BasicCegarLoop]: trace histogram [57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:22:10,374 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,57 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:22:10,374 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:22:10,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:22:10,374 INFO L82 PathProgramCache]: Analyzing trace with hash 1268919650, now seen corresponding path program 57 times [2021-05-02 13:22:10,374 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:22:10,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563322417] [2021-05-02 13:22:10,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:22:10,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:12,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:22:12,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:12,132 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:22:12,132 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:22:12,132 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563322417] [2021-05-02 13:22:12,132 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563322417] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:22:12,132 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227158607] [2021-05-02 13:22:12,132 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:22:14,743 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-05-02 13:22:14,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:22:14,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 123 conjunts are in the unsatisfiable core [2021-05-02 13:22:14,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:22:15,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:22:15,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:22:15,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227158607] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:22:15,269 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:22:15,270 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60] total 62 [2021-05-02 13:22:15,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097799023] [2021-05-02 13:22:15,270 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 13:22:15,270 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:22:15,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 13:22:15,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=3603, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 13:22:15,270 INFO L87 Difference]: Start difference. First operand 79 states and 83 transitions. Second operand has 62 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 61 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:22:19,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:22:19,891 INFO L93 Difference]: Finished difference Result 153 states and 162 transitions. [2021-05-02 13:22:19,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-02 13:22:19,891 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 61 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-05-02 13:22:19,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:22:19,892 INFO L225 Difference]: With dead ends: 153 [2021-05-02 13:22:19,892 INFO L226 Difference]: Without dead ends: 81 [2021-05-02 13:22:19,893 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 67 SyntacticMatches, 6 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1667 ImplicationChecksByTransitivity, 4817.6ms TimeCoverageRelationStatistics Valid=469, Invalid=13811, Unknown=0, NotChecked=0, Total=14280 [2021-05-02 13:22:19,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-02 13:22:19,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2021-05-02 13:22:19,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 72 states have (on average 1.0555555555555556) internal successors, (76), 73 states have internal predecessors, (76), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:22:19,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2021-05-02 13:22:19,903 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 70 [2021-05-02 13:22:19,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:22:19,903 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2021-05-02 13:22:19,903 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 61 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:22:19,903 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2021-05-02 13:22:19,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 13:22:19,903 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:22:19,904 INFO L523 BasicCegarLoop]: trace histogram [58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:22:20,108 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:22:20,108 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:22:20,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:22:20,109 INFO L82 PathProgramCache]: Analyzing trace with hash 708106050, now seen corresponding path program 58 times [2021-05-02 13:22:20,109 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:22:20,109 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [542275820] [2021-05-02 13:22:20,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:22:20,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:21,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:22:21,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:21,941 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:22:21,942 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:22:21,942 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [542275820] [2021-05-02 13:22:21,942 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [542275820] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:22:21,942 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391663351] [2021-05-02 13:22:21,942 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:22:21,997 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:22:21,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:22:21,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 119 conjunts are in the unsatisfiable core [2021-05-02 13:22:22,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:22:22,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:22:22,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:22:22,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [391663351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:22:22,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:22:22,204 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 61] total 63 [2021-05-02 13:22:22,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858235372] [2021-05-02 13:22:22,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 13:22:22,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:22:22,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 13:22:22,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=3724, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 13:22:22,205 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand has 63 states, 63 states have (on average 1.1111111111111112) internal successors, (70), 62 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:22:27,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:22:27,044 INFO L93 Difference]: Finished difference Result 155 states and 164 transitions. [2021-05-02 13:22:27,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 13:22:27,045 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.1111111111111112) internal successors, (70), 62 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-02 13:22:27,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:22:27,046 INFO L225 Difference]: With dead ends: 155 [2021-05-02 13:22:27,046 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 13:22:27,047 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1715 ImplicationChecksByTransitivity, 4657.8ms TimeCoverageRelationStatistics Valid=477, Invalid=14285, Unknown=0, NotChecked=0, Total=14762 [2021-05-02 13:22:27,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 13:22:27,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2021-05-02 13:22:27,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 73 states have (on average 1.0547945205479452) internal successors, (77), 74 states have internal predecessors, (77), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:22:27,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 85 transitions. [2021-05-02 13:22:27,056 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 85 transitions. Word has length 71 [2021-05-02 13:22:27,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:22:27,056 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 85 transitions. [2021-05-02 13:22:27,056 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 1.1111111111111112) internal successors, (70), 62 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:22:27,056 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 85 transitions. [2021-05-02 13:22:27,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-02 13:22:27,056 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:22:27,057 INFO L523 BasicCegarLoop]: trace histogram [59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:22:27,268 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2021-05-02 13:22:27,269 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:22:27,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:22:27,269 INFO L82 PathProgramCache]: Analyzing trace with hash 502753634, now seen corresponding path program 59 times [2021-05-02 13:22:27,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:22:27,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199504591] [2021-05-02 13:22:27,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:22:27,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:29,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:22:29,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:29,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:22:29,240 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:22:29,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199504591] [2021-05-02 13:22:29,240 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199504591] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:22:29,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671316889] [2021-05-02 13:22:29,240 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:23:28,396 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2021-05-02 13:23:28,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:23:28,413 WARN L261 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 177 conjunts are in the unsatisfiable core [2021-05-02 13:23:28,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:23:30,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:23:30,514 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:23:30,515 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671316889] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:23:30,515 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:23:30,515 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62] total 64 [2021-05-02 13:23:30,515 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714717645] [2021-05-02 13:23:30,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 13:23:30,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:23:30,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 13:23:30,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=3847, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 13:23:30,516 INFO L87 Difference]: Start difference. First operand 81 states and 85 transitions. Second operand has 64 states, 64 states have (on average 1.109375) internal successors, (71), 63 states have internal predecessors, (71), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:23:35,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:23:35,666 INFO L93 Difference]: Finished difference Result 157 states and 166 transitions. [2021-05-02 13:23:35,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-02 13:23:35,666 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.109375) internal successors, (71), 63 states have internal predecessors, (71), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2021-05-02 13:23:35,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:23:35,667 INFO L225 Difference]: With dead ends: 157 [2021-05-02 13:23:35,667 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 13:23:35,668 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 18 SyntacticMatches, 57 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1886 ImplicationChecksByTransitivity, 6884.3ms TimeCoverageRelationStatistics Valid=485, Invalid=14767, Unknown=0, NotChecked=0, Total=15252 [2021-05-02 13:23:35,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 13:23:35,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-05-02 13:23:35,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 74 states have (on average 1.054054054054054) internal successors, (78), 75 states have internal predecessors, (78), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:23:35,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-05-02 13:23:35,676 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 72 [2021-05-02 13:23:35,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:23:35,676 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-05-02 13:23:35,676 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 1.109375) internal successors, (71), 63 states have internal predecessors, (71), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:23:35,676 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-05-02 13:23:35,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 13:23:35,676 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:23:35,676 INFO L523 BasicCegarLoop]: trace histogram [60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:23:35,877 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,60 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:23:35,877 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:23:35,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:23:35,878 INFO L82 PathProgramCache]: Analyzing trace with hash -1568203966, now seen corresponding path program 60 times [2021-05-02 13:23:35,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:23:35,878 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611570920] [2021-05-02 13:23:35,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:23:35,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:23:37,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:23:37,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:23:37,829 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:23:37,829 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:23:37,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611570920] [2021-05-02 13:23:37,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611570920] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:23:37,830 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95764337] [2021-05-02 13:23:37,830 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 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:23:58,808 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 13:23:58,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:23:58,822 WARN L261 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 152 conjunts are in the unsatisfiable core [2021-05-02 13:23:58,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:23:59,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:23:59,946 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95764337] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:23:59,947 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:23:59,947 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 63] total 65 [2021-05-02 13:23:59,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208264694] [2021-05-02 13:23:59,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 13:23:59,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:23:59,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 13:23:59,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=3972, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 13:23:59,948 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 65 states, 65 states have (on average 1.1076923076923078) internal successors, (72), 64 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:24:04,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:24:04,857 INFO L93 Difference]: Finished difference Result 159 states and 168 transitions. [2021-05-02 13:24:04,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-02 13:24:04,857 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.1076923076923078) internal successors, (72), 64 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-02 13:24:04,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:24:04,858 INFO L225 Difference]: With dead ends: 159 [2021-05-02 13:24:04,858 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 13:24:04,859 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 52 SyntacticMatches, 24 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1878 ImplicationChecksByTransitivity, 5859.8ms TimeCoverageRelationStatistics Valid=493, Invalid=15257, Unknown=0, NotChecked=0, Total=15750 [2021-05-02 13:24:04,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 13:24:04,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2021-05-02 13:24:04,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 75 states have (on average 1.0533333333333332) internal successors, (79), 76 states have internal predecessors, (79), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:24:04,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2021-05-02 13:24:04,868 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 73 [2021-05-02 13:24:04,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:24:04,868 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2021-05-02 13:24:04,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 1.1076923076923078) internal successors, (72), 64 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:24:04,868 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2021-05-02 13:24:04,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 13:24:04,869 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:24:04,869 INFO L523 BasicCegarLoop]: trace histogram [61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:24:05,069 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-05-02 13:24:05,070 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:24:05,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:24:05,070 INFO L82 PathProgramCache]: Analyzing trace with hash -1343380126, now seen corresponding path program 61 times [2021-05-02 13:24:05,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:24:05,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221663100] [2021-05-02 13:24:05,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:24:05,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:07,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:24:07,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:07,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:24:07,188 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:24:07,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221663100] [2021-05-02 13:24:07,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1221663100] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:24:07,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121672815] [2021-05-02 13:24:07,188 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:24:07,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:07,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 125 conjunts are in the unsatisfiable core [2021-05-02 13:24:07,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:24:07,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:24:07,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:24:07,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2121672815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:24:07,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:24:07,450 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 64] total 66 [2021-05-02 13:24:07,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431849874] [2021-05-02 13:24:07,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 13:24:07,451 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:24:07,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 13:24:07,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=4099, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:24:07,451 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand has 66 states, 66 states have (on average 1.106060606060606) internal successors, (73), 65 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:24:12,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:24:12,792 INFO L93 Difference]: Finished difference Result 161 states and 170 transitions. [2021-05-02 13:24:12,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-02 13:24:12,794 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.106060606060606) internal successors, (73), 65 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-02 13:24:12,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:24:12,794 INFO L225 Difference]: With dead ends: 161 [2021-05-02 13:24:12,794 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 13:24:12,795 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1895 ImplicationChecksByTransitivity, 5207.3ms TimeCoverageRelationStatistics Valid=501, Invalid=15755, Unknown=0, NotChecked=0, Total=16256 [2021-05-02 13:24:12,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 13:24:12,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2021-05-02 13:24:12,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 76 states have (on average 1.0526315789473684) internal successors, (80), 77 states have internal predecessors, (80), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:24:12,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2021-05-02 13:24:12,805 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 74 [2021-05-02 13:24:12,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:24:12,806 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2021-05-02 13:24:12,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 1.106060606060606) internal successors, (73), 65 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:24:12,806 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2021-05-02 13:24:12,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 13:24:12,806 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:24:12,806 INFO L523 BasicCegarLoop]: trace histogram [62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:24:13,007 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,62 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:24:13,007 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:24:13,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:24:13,007 INFO L82 PathProgramCache]: Analyzing trace with hash 1331191618, now seen corresponding path program 62 times [2021-05-02 13:24:13,007 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:24:13,008 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574102750] [2021-05-02 13:24:13,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:24:13,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:15,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:24:15,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:15,113 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:24:15,113 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:24:15,113 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574102750] [2021-05-02 13:24:15,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1574102750] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:24:15,113 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917905588] [2021-05-02 13:24:15,113 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 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:24:15,171 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:24:15,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:24:15,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 127 conjunts are in the unsatisfiable core [2021-05-02 13:24:15,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:24:15,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:24:15,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:24:15,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [917905588] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:24:15,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:24:15,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 65] total 67 [2021-05-02 13:24:15,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654822181] [2021-05-02 13:24:15,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-02 13:24:15,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:24:15,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-02 13:24:15,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=4228, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 13:24:15,363 INFO L87 Difference]: Start difference. First operand 84 states and 88 transitions. Second operand has 67 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 66 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:24:20,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:24:20,862 INFO L93 Difference]: Finished difference Result 163 states and 172 transitions. [2021-05-02 13:24:20,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 13:24:20,863 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 66 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-02 13:24:20,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:24:20,863 INFO L225 Difference]: With dead ends: 163 [2021-05-02 13:24:20,863 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 13:24:20,864 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1957 ImplicationChecksByTransitivity, 5271.6ms TimeCoverageRelationStatistics Valid=509, Invalid=16261, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 13:24:20,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 13:24:20,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 13:24:20,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 77 states have (on average 1.051948051948052) internal successors, (81), 78 states have internal predecessors, (81), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:24:20,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 89 transitions. [2021-05-02 13:24:20,875 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 89 transitions. Word has length 75 [2021-05-02 13:24:20,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:24:20,875 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 89 transitions. [2021-05-02 13:24:20,875 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 66 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:24:20,875 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 89 transitions. [2021-05-02 13:24:20,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 13:24:20,876 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:24:20,876 INFO L523 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:24:21,080 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-05-02 13:24:21,081 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:24:21,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:24:21,081 INFO L82 PathProgramCache]: Analyzing trace with hash -1656430238, now seen corresponding path program 63 times [2021-05-02 13:24:21,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:24:21,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530122292] [2021-05-02 13:24:21,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:24:21,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:23,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:24:23,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:23,292 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:24:23,292 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:24:23,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530122292] [2021-05-02 13:24:23,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530122292] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:24:23,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1945409845] [2021-05-02 13:24:23,292 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 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:24:27,440 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2021-05-02 13:24:27,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:24:27,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 132 conjunts are in the unsatisfiable core [2021-05-02 13:24:27,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:24:27,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:24:27,937 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:24:27,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1945409845] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:24:27,937 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:24:27,937 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66] total 68 [2021-05-02 13:24:27,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142814466] [2021-05-02 13:24:27,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-02 13:24:27,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:24:27,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-02 13:24:27,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=4359, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 13:24:27,939 INFO L87 Difference]: Start difference. First operand 85 states and 89 transitions. Second operand has 68 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 67 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:24:33,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:24:33,635 INFO L93 Difference]: Finished difference Result 165 states and 174 transitions. [2021-05-02 13:24:33,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-02 13:24:33,635 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 67 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 76 [2021-05-02 13:24:33,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:24:33,636 INFO L225 Difference]: With dead ends: 165 [2021-05-02 13:24:33,636 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 13:24:33,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 75 SyntacticMatches, 4 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2026 ImplicationChecksByTransitivity, 5718.8ms TimeCoverageRelationStatistics Valid=517, Invalid=16775, Unknown=0, NotChecked=0, Total=17292 [2021-05-02 13:24:33,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 13:24:33,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2021-05-02 13:24:33,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 78 states have (on average 1.0512820512820513) internal successors, (82), 79 states have internal predecessors, (82), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:24:33,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2021-05-02 13:24:33,648 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 76 [2021-05-02 13:24:33,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:24:33,648 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2021-05-02 13:24:33,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 67 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:24:33,648 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2021-05-02 13:24:33,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 13:24:33,649 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:24:33,649 INFO L523 BasicCegarLoop]: trace histogram [64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:24:33,854 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,64 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:24:33,855 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:24:33,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:24:33,855 INFO L82 PathProgramCache]: Analyzing trace with hash 216572738, now seen corresponding path program 64 times [2021-05-02 13:24:33,855 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:24:33,855 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21065932] [2021-05-02 13:24:33,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:24:33,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:36,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:24:36,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:36,127 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:24:36,127 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:24:36,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21065932] [2021-05-02 13:24:36,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [21065932] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:24:36,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719813848] [2021-05-02 13:24:36,127 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 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:24:36,183 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:24:36,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:24:36,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 131 conjunts are in the unsatisfiable core [2021-05-02 13:24:36,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:24:36,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:24:36,383 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:24:36,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719813848] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:24:36,384 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:24:36,384 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 67] total 69 [2021-05-02 13:24:36,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321024531] [2021-05-02 13:24:36,384 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-02 13:24:36,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:24:36,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-02 13:24:36,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=4492, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 13:24:36,385 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 69 states, 69 states have (on average 1.1014492753623188) internal successors, (76), 68 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:24:42,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:24:42,297 INFO L93 Difference]: Finished difference Result 167 states and 176 transitions. [2021-05-02 13:24:42,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-02 13:24:42,297 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.1014492753623188) internal successors, (76), 68 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-02 13:24:42,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:24:42,298 INFO L225 Difference]: With dead ends: 167 [2021-05-02 13:24:42,298 INFO L226 Difference]: Without dead ends: 88 [2021-05-02 13:24:42,299 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2084 ImplicationChecksByTransitivity, 5650.5ms TimeCoverageRelationStatistics Valid=525, Invalid=17297, Unknown=0, NotChecked=0, Total=17822 [2021-05-02 13:24:42,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-02 13:24:42,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2021-05-02 13:24:42,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 79 states have (on average 1.0506329113924051) internal successors, (83), 80 states have internal predecessors, (83), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:24:42,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 91 transitions. [2021-05-02 13:24:42,309 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 91 transitions. Word has length 77 [2021-05-02 13:24:42,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:24:42,310 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 91 transitions. [2021-05-02 13:24:42,310 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 69 states, 69 states have (on average 1.1014492753623188) internal successors, (76), 68 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:24:42,310 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 91 transitions. [2021-05-02 13:24:42,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 13:24:42,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:24:42,311 INFO L523 BasicCegarLoop]: trace histogram [65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:24:42,535 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-05-02 13:24:42,535 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:24:42,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:24:42,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1849877150, now seen corresponding path program 65 times [2021-05-02 13:24:42,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:24:42,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630457607] [2021-05-02 13:24:42,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:24:42,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:44,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:24:44,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:44,825 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:24:44,825 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:24:44,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630457607] [2021-05-02 13:24:44,826 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630457607] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:24:44,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414185494] [2021-05-02 13:24:44,826 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:26:37,527 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 34 check-sat command(s) [2021-05-02 13:26:37,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:26:37,554 WARN L261 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 196 conjunts are in the unsatisfiable core [2021-05-02 13:26:37,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:26:40,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:26:40,265 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:26:40,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414185494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:26:40,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:26:40,265 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 68] total 70 [2021-05-02 13:26:40,265 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114680115] [2021-05-02 13:26:40,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-02 13:26:40,266 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:26:40,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-02 13:26:40,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=4627, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 13:26:40,267 INFO L87 Difference]: Start difference. First operand 87 states and 91 transitions. Second operand has 70 states, 70 states have (on average 1.1) internal successors, (77), 69 states have internal predecessors, (77), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:26:46,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:26:46,358 INFO L93 Difference]: Finished difference Result 169 states and 178 transitions. [2021-05-02 13:26:46,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-02 13:26:46,358 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.1) internal successors, (77), 69 states have internal predecessors, (77), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 78 [2021-05-02 13:26:46,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:26:46,359 INFO L225 Difference]: With dead ends: 169 [2021-05-02 13:26:46,359 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 13:26:46,360 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 17 SyntacticMatches, 64 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2275 ImplicationChecksByTransitivity, 8261.9ms TimeCoverageRelationStatistics Valid=533, Invalid=17827, Unknown=0, NotChecked=0, Total=18360 [2021-05-02 13:26:46,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 13:26:46,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-05-02 13:26:46,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 80 states have (on average 1.05) internal successors, (84), 81 states have internal predecessors, (84), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:26:46,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2021-05-02 13:26:46,372 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 78 [2021-05-02 13:26:46,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:26:46,372 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2021-05-02 13:26:46,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 1.1) internal successors, (77), 69 states have internal predecessors, (77), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:26:46,372 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2021-05-02 13:26:46,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 13:26:46,372 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:26:46,372 INFO L523 BasicCegarLoop]: trace histogram [66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:26:46,573 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-05-02 13:26:46,573 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:26:46,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:26:46,573 INFO L82 PathProgramCache]: Analyzing trace with hash -1485314238, now seen corresponding path program 66 times [2021-05-02 13:26:46,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:26:46,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47762156] [2021-05-02 13:26:46,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:26:46,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:26:48,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:26:48,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:26:48,964 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 0 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:26:48,965 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:26:48,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47762156] [2021-05-02 13:26:48,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47762156] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:26:48,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1629311244] [2021-05-02 13:26:48,965 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 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:27:45,348 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 34 check-sat command(s) [2021-05-02 13:27:45,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:27:45,368 WARN L261 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 181 conjunts are in the unsatisfiable core [2021-05-02 13:27:45,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:27:47,460 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 0 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:27:47,461 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1629311244] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:27:47,461 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:27:47,461 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 69] total 71 [2021-05-02 13:27:47,461 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533690635] [2021-05-02 13:27:47,461 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-02 13:27:47,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:27:47,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-02 13:27:47,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=4764, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 13:27:47,462 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 71 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 70 states have internal predecessors, (78), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:27:53,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:27:53,492 INFO L93 Difference]: Finished difference Result 171 states and 180 transitions. [2021-05-02 13:27:53,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-02 13:27:53,493 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 70 states have internal predecessors, (78), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2021-05-02 13:27:53,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:27:53,493 INFO L225 Difference]: With dead ends: 171 [2021-05-02 13:27:53,493 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 13:27:53,494 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 41 SyntacticMatches, 41 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2293 ImplicationChecksByTransitivity, 7876.9ms TimeCoverageRelationStatistics Valid=541, Invalid=18365, Unknown=0, NotChecked=0, Total=18906 [2021-05-02 13:27:53,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 13:27:53,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2021-05-02 13:27:53,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 81 states have (on average 1.0493827160493827) internal successors, (85), 82 states have internal predecessors, (85), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:27:53,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 93 transitions. [2021-05-02 13:27:53,501 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 93 transitions. Word has length 79 [2021-05-02 13:27:53,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:27:53,501 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 93 transitions. [2021-05-02 13:27:53,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 71 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 70 states have internal predecessors, (78), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:27:53,501 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 93 transitions. [2021-05-02 13:27:53,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 13:27:53,501 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:27:53,501 INFO L523 BasicCegarLoop]: trace histogram [67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:27:53,701 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,67 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:27:53,702 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:27:53,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:27:53,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1226201442, now seen corresponding path program 67 times [2021-05-02 13:27:53,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:27:53,702 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888966972] [2021-05-02 13:27:53,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:27:53,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:56,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:27:56,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:56,100 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:27:56,100 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:27:56,101 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888966972] [2021-05-02 13:27:56,101 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888966972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:27:56,101 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688427354] [2021-05-02 13:27:56,101 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:27:56,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:56,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 137 conjunts are in the unsatisfiable core [2021-05-02 13:27:56,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:27:56,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:27:56,375 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:27:56,375 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1688427354] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:27:56,375 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:27:56,375 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70] total 72 [2021-05-02 13:27:56,375 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995300692] [2021-05-02 13:27:56,376 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-02 13:27:56,376 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:27:56,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-02 13:27:56,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=4903, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 13:27:56,377 INFO L87 Difference]: Start difference. First operand 89 states and 93 transitions. Second operand has 72 states, 72 states have (on average 1.0972222222222223) internal successors, (79), 71 states have internal predecessors, (79), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:28:02,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:02,695 INFO L93 Difference]: Finished difference Result 173 states and 182 transitions. [2021-05-02 13:28:02,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 13:28:02,696 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.0972222222222223) internal successors, (79), 71 states have internal predecessors, (79), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-05-02 13:28:02,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:02,696 INFO L225 Difference]: With dead ends: 173 [2021-05-02 13:28:02,697 INFO L226 Difference]: Without dead ends: 91 [2021-05-02 13:28:02,698 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2282 ImplicationChecksByTransitivity, 6026.2ms TimeCoverageRelationStatistics Valid=549, Invalid=18911, Unknown=0, NotChecked=0, Total=19460 [2021-05-02 13:28:02,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-02 13:28:02,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2021-05-02 13:28:02,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 82 states have (on average 1.048780487804878) internal successors, (86), 83 states have internal predecessors, (86), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:28:02,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2021-05-02 13:28:02,708 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 80 [2021-05-02 13:28:02,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:02,708 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2021-05-02 13:28:02,708 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 72 states have (on average 1.0972222222222223) internal successors, (79), 71 states have internal predecessors, (79), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:28:02,709 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2021-05-02 13:28:02,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 13:28:02,709 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:02,709 INFO L523 BasicCegarLoop]: trace histogram [68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:02,924 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,68 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:02,925 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:02,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:02,925 INFO L82 PathProgramCache]: Analyzing trace with hash -616158398, now seen corresponding path program 68 times [2021-05-02 13:28:02,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:02,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752366416] [2021-05-02 13:28:02,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:02,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:05,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:05,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:05,483 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 0 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:28:05,483 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:05,483 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752366416] [2021-05-02 13:28:05,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752366416] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:05,483 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453341867] [2021-05-02 13:28:05,483 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 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:05,551 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:28:05,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:05,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 139 conjunts are in the unsatisfiable core [2021-05-02 13:28:05,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:05,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,756 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 0 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:28:05,756 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453341867] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:05,756 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:05,756 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 71] total 73 [2021-05-02 13:28:05,756 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053222241] [2021-05-02 13:28:05,756 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-02 13:28:05,756 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:05,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-02 13:28:05,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=5044, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 13:28:05,757 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 73 states, 73 states have (on average 1.095890410958904) internal successors, (80), 72 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:28:12,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:12,319 INFO L93 Difference]: Finished difference Result 175 states and 184 transitions. [2021-05-02 13:28:12,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-02 13:28:12,320 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.095890410958904) internal successors, (80), 72 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-02 13:28:12,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:12,321 INFO L225 Difference]: With dead ends: 175 [2021-05-02 13:28:12,321 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 13:28:12,322 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2350 ImplicationChecksByTransitivity, 6308.8ms TimeCoverageRelationStatistics Valid=557, Invalid=19465, Unknown=0, NotChecked=0, Total=20022 [2021-05-02 13:28:12,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 13:28:12,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-05-02 13:28:12,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 83 states have (on average 1.0481927710843373) internal successors, (87), 84 states have internal predecessors, (87), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:28:12,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 95 transitions. [2021-05-02 13:28:12,328 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 95 transitions. Word has length 81 [2021-05-02 13:28:12,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:12,329 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 95 transitions. [2021-05-02 13:28:12,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 1.095890410958904) internal successors, (80), 72 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:28:12,329 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 95 transitions. [2021-05-02 13:28:12,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 13:28:12,329 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:12,329 INFO L523 BasicCegarLoop]: trace histogram [69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:12,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,69 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:12,533 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:12,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:12,533 INFO L82 PathProgramCache]: Analyzing trace with hash -1894738590, now seen corresponding path program 69 times [2021-05-02 13:28:12,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:12,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640605106] [2021-05-02 13:28:12,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:12,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:15,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:15,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:15,125 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:28:15,125 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:15,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640605106] [2021-05-02 13:28:15,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640605106] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:15,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118006279] [2021-05-02 13:28:15,125 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:20,880 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2021-05-02 13:28:20,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:20,886 WARN L261 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 159 conjunts are in the unsatisfiable core [2021-05-02 13:28:20,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:22,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:22,328 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:28:22,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118006279] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:22,329 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:22,329 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 72] total 74 [2021-05-02 13:28:22,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106257837] [2021-05-02 13:28:22,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-02 13:28:22,329 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:22,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-02 13:28:22,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=5187, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 13:28:22,330 INFO L87 Difference]: Start difference. First operand 91 states and 95 transitions. Second operand has 74 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 73 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:28:29,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:29,078 INFO L93 Difference]: Finished difference Result 177 states and 186 transitions. [2021-05-02 13:28:29,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-02 13:28:29,079 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 73 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-05-02 13:28:29,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:29,079 INFO L225 Difference]: With dead ends: 177 [2021-05-02 13:28:29,079 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 13:28:29,081 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 66 SyntacticMatches, 19 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2455 ImplicationChecksByTransitivity, 7686.2ms TimeCoverageRelationStatistics Valid=565, Invalid=20027, Unknown=0, NotChecked=0, Total=20592 [2021-05-02 13:28:29,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 13:28:29,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2021-05-02 13:28:29,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 84 states have (on average 1.0476190476190477) internal successors, (88), 85 states have internal predecessors, (88), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:28:29,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 96 transitions. [2021-05-02 13:28:29,088 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 96 transitions. Word has length 82 [2021-05-02 13:28:29,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:29,088 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 96 transitions. [2021-05-02 13:28:29,088 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 73 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:28:29,088 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 96 transitions. [2021-05-02 13:28:29,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 13:28:29,088 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:29,089 INFO L523 BasicCegarLoop]: trace histogram [70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:29,289 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,70 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:29,289 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:29,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:29,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1418948418, now seen corresponding path program 70 times [2021-05-02 13:28:29,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:29,290 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105390627] [2021-05-02 13:28:29,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:29,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:31,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:31,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:31,965 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 0 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:28:31,966 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:31,966 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105390627] [2021-05-02 13:28:31,966 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105390627] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:31,966 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559563673] [2021-05-02 13:28:31,966 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:32,057 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:28:32,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:32,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 143 conjunts are in the unsatisfiable core [2021-05-02 13:28:32,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:32,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:32,288 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 0 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:28:32,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1559563673] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:32,288 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:32,288 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 73] total 75 [2021-05-02 13:28:32,288 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139984109] [2021-05-02 13:28:32,289 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-02 13:28:32,289 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:32,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-02 13:28:32,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=5332, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 13:28:32,289 INFO L87 Difference]: Start difference. First operand 92 states and 96 transitions. Second operand has 75 states, 75 states have (on average 1.0933333333333333) internal successors, (82), 74 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:28:38,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:38,916 INFO L93 Difference]: Finished difference Result 179 states and 188 transitions. [2021-05-02 13:28:38,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-02 13:28:38,917 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.0933333333333333) internal successors, (82), 74 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-02 13:28:38,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:38,917 INFO L225 Difference]: With dead ends: 179 [2021-05-02 13:28:38,917 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 13:28:38,918 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2489 ImplicationChecksByTransitivity, 6660.3ms TimeCoverageRelationStatistics Valid=573, Invalid=20597, Unknown=0, NotChecked=0, Total=21170 [2021-05-02 13:28:38,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 13:28:38,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-05-02 13:28:38,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 85 states have (on average 1.0470588235294118) internal successors, (89), 86 states have internal predecessors, (89), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:28:38,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 97 transitions. [2021-05-02 13:28:38,928 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 97 transitions. Word has length 83 [2021-05-02 13:28:38,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:38,928 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 97 transitions. [2021-05-02 13:28:38,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 75 states have (on average 1.0933333333333333) internal successors, (82), 74 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:28:38,928 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 97 transitions. [2021-05-02 13:28:38,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-05-02 13:28:38,929 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:38,929 INFO L523 BasicCegarLoop]: trace histogram [71, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:39,129 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-05-02 13:28:39,129 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:39,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:39,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1064030562, now seen corresponding path program 71 times [2021-05-02 13:28:39,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:39,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238246332] [2021-05-02 13:28:39,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:39,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:41,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:41,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:41,933 INFO L134 CoverageAnalysis]: Checked inductivity of 2556 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:28:41,933 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:41,934 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238246332] [2021-05-02 13:28:41,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238246332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:41,934 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1817646500] [2021-05-02 13:28:41,934 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true