/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/in-de52.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:01:43,250 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:01:43,251 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:01:43,288 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:01:43,304 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:01:43,305 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:01:43,306 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:01:43,307 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:01:43,309 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:01:43,310 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:01:43,311 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:01:43,317 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:01:43,330 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:01:43,331 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:01:43,332 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:01:43,334 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:01:43,339 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:01:43,346 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:01:43,347 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:01:43,347 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:01:43,350 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:01:43,367 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:01:43,367 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:01:43,368 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:01:43,368 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:01:43,368 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:01:43,369 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:01:43,369 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:01:43,369 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:01:43,369 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:01:43,369 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:01:43,369 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:01:43,369 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:01:43,369 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:01:43,369 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:01:43,369 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:01:43,370 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:01:43,370 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:01:43,370 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:01:43,370 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:01:43,370 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:01:43,370 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:01:43,370 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:01:43,370 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:01:43,370 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:01:43,371 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:01:43,371 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:01:43,371 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:01:43,371 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:01:43,371 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:01:43,640 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:01:43,660 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:01:43,662 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:01:43,663 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:01:43,663 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:01:43,664 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de52.c [2021-05-02 13:01:43,723 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1df50f9bc/595d188fbf2b4f27a7098963c9866275/FLAGc93e8f452 [2021-05-02 13:01:44,046 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:01:44,047 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de52.c [2021-05-02 13:01:44,051 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1df50f9bc/595d188fbf2b4f27a7098963c9866275/FLAGc93e8f452 [2021-05-02 13:01:44,065 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1df50f9bc/595d188fbf2b4f27a7098963c9866275 [2021-05-02 13:01:44,067 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:01:44,069 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:01:44,071 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:01:44,072 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:01:44,074 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:01:44,075 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:01:44" (1/1) ... [2021-05-02 13:01:44,075 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6321e4c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:44, skipping insertion in model container [2021-05-02 13:01:44,075 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:01:44" (1/1) ... [2021-05-02 13:01:44,080 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:01:44,092 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:01:44,211 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de52.c[368,381] [2021-05-02 13:01:44,224 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:01:44,230 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:01:44,275 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de52.c[368,381] [2021-05-02 13:01:44,288 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:01:44,300 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:01:44,301 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:44 WrapperNode [2021-05-02 13:01:44,301 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:01:44,301 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:01:44,301 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:01:44,301 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:01:44,309 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:44" (1/1) ... [2021-05-02 13:01:44,310 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:44" (1/1) ... [2021-05-02 13:01:44,316 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:44" (1/1) ... [2021-05-02 13:01:44,316 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:44" (1/1) ... [2021-05-02 13:01:44,326 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:44" (1/1) ... [2021-05-02 13:01:44,332 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:44" (1/1) ... [2021-05-02 13:01:44,337 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:44" (1/1) ... [2021-05-02 13:01:44,340 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:01:44,341 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:01:44,341 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:01:44,341 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:01:44,341 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:44" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:01:44,397 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:01:44,397 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:01:44,397 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:01:44,398 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:01:44,398 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:01:44,398 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:01:44,398 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:01:44,398 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:01:44,399 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:01:44,399 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 13:01:44,399 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:01:44,399 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:01:44,400 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:01:44,400 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:01:44,405 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:01:44,405 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:01:44,405 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:01:44,406 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:01:44,640 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:01:44,641 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-02 13:01:44,642 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:01:44 BoogieIcfgContainer [2021-05-02 13:01:44,642 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:01:44,643 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:01:44,643 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:01:44,645 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:01:44,645 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:01:44" (1/3) ... [2021-05-02 13:01:44,649 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d58d2f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:01:44, skipping insertion in model container [2021-05-02 13:01:44,650 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:44" (2/3) ... [2021-05-02 13:01:44,650 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d58d2f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:01:44, skipping insertion in model container [2021-05-02 13:01:44,650 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:01:44" (3/3) ... [2021-05-02 13:01:44,651 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de52.c [2021-05-02 13:01:44,667 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:01:44,669 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:01:44,688 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:01:44,702 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:01:44,703 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:01:44,703 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:01:44,703 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:01:44,703 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:01:44,703 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:01:44,703 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:01:44,703 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:01:44,730 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:01:44,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 13:01:44,733 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:44,733 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:44,733 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:44,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:44,737 INFO L82 PathProgramCache]: Analyzing trace with hash -1060076674, now seen corresponding path program 1 times [2021-05-02 13:01:44,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:44,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092704589] [2021-05-02 13:01:44,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:44,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:44,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:44,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:44,948 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 13:01:44,948 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:44,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092704589] [2021-05-02 13:01:44,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092704589] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:01:44,949 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:01:44,950 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:01:44,950 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631562267] [2021-05-02 13:01:44,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:01:44,954 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:44,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:01:44,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:01:44,966 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:45,010 INFO L93 Difference]: Finished difference Result 41 states and 60 transitions. [2021-05-02 13:01:45,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:01:45,012 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-02 13:01:45,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:45,016 INFO L225 Difference]: With dead ends: 41 [2021-05-02 13:01:45,016 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 13:01:45,019 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 41.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:01:45,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 13:01:45,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 13:01:45,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-05-02 13:01:45,047 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 16 [2021-05-02 13:01:45,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:45,047 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-05-02 13:01:45,047 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,048 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-05-02 13:01:45,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 13:01:45,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:45,049 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:45,050 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:01:45,050 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:45,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:45,050 INFO L82 PathProgramCache]: Analyzing trace with hash -1174593278, now seen corresponding path program 1 times [2021-05-02 13:01:45,051 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:45,051 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45319854] [2021-05-02 13:01:45,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:45,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:45,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:45,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:45,193 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:45,193 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:45,193 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45319854] [2021-05-02 13:01:45,193 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [45319854] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:01:45,193 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:01:45,193 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:01:45,194 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842930865] [2021-05-02 13:01:45,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:01:45,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:45,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:01:45,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:01:45,195 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:45,387 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2021-05-02 13:01:45,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:01:45,388 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-02 13:01:45,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:45,388 INFO L225 Difference]: With dead ends: 34 [2021-05-02 13:01:45,388 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 13:01:45,389 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 138.0ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:01:45,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 13:01:45,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 13:01:45,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 18 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 30 transitions. [2021-05-02 13:01:45,394 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 30 transitions. Word has length 16 [2021-05-02 13:01:45,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:45,394 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 30 transitions. [2021-05-02 13:01:45,394 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,395 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 30 transitions. [2021-05-02 13:01:45,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:01:45,395 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:45,395 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:45,395 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:01:45,395 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:45,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:45,396 INFO L82 PathProgramCache]: Analyzing trace with hash -2018158143, now seen corresponding path program 1 times [2021-05-02 13:01:45,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:45,396 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337201839] [2021-05-02 13:01:45,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:45,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:45,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:45,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:45,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:45,460 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:45,460 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337201839] [2021-05-02 13:01:45,460 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337201839] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:01:45,460 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:01:45,460 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:01:45,461 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563090207] [2021-05-02 13:01:45,461 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:01:45,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:45,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:01:45,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:01:45,462 INFO L87 Difference]: Start difference. First operand 23 states and 30 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:45,513 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2021-05-02 13:01:45,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:01:45,514 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:01:45,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:45,515 INFO L225 Difference]: With dead ends: 34 [2021-05-02 13:01:45,516 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:01:45,517 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 37.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:01:45,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:01:45,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-02 13:01:45,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 22 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2021-05-02 13:01:45,543 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 17 [2021-05-02 13:01:45,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:45,543 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2021-05-02 13:01:45,543 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,543 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2021-05-02 13:01:45,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:01:45,544 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:45,544 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:45,544 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:01:45,544 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:45,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:45,545 INFO L82 PathProgramCache]: Analyzing trace with hash -615329744, now seen corresponding path program 1 times [2021-05-02 13:01:45,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:45,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416406951] [2021-05-02 13:01:45,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:45,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:45,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:45,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:45,606 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:45,606 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:45,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416406951] [2021-05-02 13:01:45,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416406951] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:01:45,607 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:01:45,607 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:01:45,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124094451] [2021-05-02 13:01:45,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:01:45,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:45,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:01:45,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:01:45,609 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:45,666 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2021-05-02 13:01:45,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:01:45,666 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:01:45,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:45,667 INFO L225 Difference]: With dead ends: 43 [2021-05-02 13:01:45,667 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 13:01:45,668 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 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 13:01:45,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 13:01:45,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 13:01:45,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 27 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 43 transitions. [2021-05-02 13:01:45,685 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 43 transitions. Word has length 17 [2021-05-02 13:01:45,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:45,685 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 43 transitions. [2021-05-02 13:01:45,686 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,686 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 43 transitions. [2021-05-02 13:01:45,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 13:01:45,686 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:45,686 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:45,686 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 13:01:45,687 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:45,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:45,687 INFO L82 PathProgramCache]: Analyzing trace with hash 669375650, now seen corresponding path program 1 times [2021-05-02 13:01:45,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:45,687 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103893717] [2021-05-02 13:01:45,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:45,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:45,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:45,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:45,764 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:01:45,765 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:45,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103893717] [2021-05-02 13:01:45,765 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103893717] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:01:45,765 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:01:45,765 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 13:01:45,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387213664] [2021-05-02 13:01:45,765 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:01:45,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:45,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:01:45,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:01:45,766 INFO L87 Difference]: Start difference. First operand 32 states and 43 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:45,846 INFO L93 Difference]: Finished difference Result 40 states and 51 transitions. [2021-05-02 13:01:45,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:01:45,847 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 18 [2021-05-02 13:01:45,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:45,848 INFO L225 Difference]: With dead ends: 40 [2021-05-02 13:01:45,848 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 13:01:45,849 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 62.1ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:01:45,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 13:01:45,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 13:01:45,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2021-05-02 13:01:45,861 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 18 [2021-05-02 13:01:45,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:45,861 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2021-05-02 13:01:45,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:45,861 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2021-05-02 13:01:45,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 13:01:45,863 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:45,863 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:45,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 13:01:45,863 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:45,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:45,863 INFO L82 PathProgramCache]: Analyzing trace with hash 735022287, now seen corresponding path program 1 times [2021-05-02 13:01:45,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:45,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438857517] [2021-05-02 13:01:45,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:45,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:45,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:45,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:45,962 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:01:45,962 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:45,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438857517] [2021-05-02 13:01:45,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438857517] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:45,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074924037] [2021-05-02 13:01:45,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:46,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:46,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:01:46,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:46,145 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:01:46,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1074924037] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:46,145 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:46,145 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:01:46,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101739170] [2021-05-02 13:01:46,146 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:01:46,146 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:46,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:01:46,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:01:46,147 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:46,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:46,295 INFO L93 Difference]: Finished difference Result 57 states and 80 transitions. [2021-05-02 13:01:46,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:01:46,295 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 13:01:46,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:46,298 INFO L225 Difference]: With dead ends: 57 [2021-05-02 13:01:46,298 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 13:01:46,298 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 118.6ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:01:46,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 13:01:46,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 34. [2021-05-02 13:01:46,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 29 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:46,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions. [2021-05-02 13:01:46,310 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 19 [2021-05-02 13:01:46,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:46,310 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 45 transitions. [2021-05-02 13:01:46,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:46,311 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions. [2021-05-02 13:01:46,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 13:01:46,311 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:46,311 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:46,518 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 13:01:46,519 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:46,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:46,519 INFO L82 PathProgramCache]: Analyzing trace with hash 342490275, now seen corresponding path program 1 times [2021-05-02 13:01:46,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:46,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152171158] [2021-05-02 13:01:46,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:46,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:46,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:46,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:46,581 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:01:46,581 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:46,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152171158] [2021-05-02 13:01:46,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152171158] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:46,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [71504583] [2021-05-02 13:01:46,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:46,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:46,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:01:46,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:46,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:46,733 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:01:46,734 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [71504583] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:46,734 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:46,734 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2021-05-02 13:01:46,734 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231831794] [2021-05-02 13:01:46,735 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:01:46,735 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:46,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:01:46,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:01:46,735 INFO L87 Difference]: Start difference. First operand 34 states and 45 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:46,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:46,827 INFO L93 Difference]: Finished difference Result 49 states and 65 transitions. [2021-05-02 13:01:46,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:01:46,828 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 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 20 [2021-05-02 13:01:46,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:46,829 INFO L225 Difference]: With dead ends: 49 [2021-05-02 13:01:46,829 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 13:01:46,829 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 72.1ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:01:46,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 13:01:46,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-02 13:01:46,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 36 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:46,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 56 transitions. [2021-05-02 13:01:46,833 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 56 transitions. Word has length 20 [2021-05-02 13:01:46,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:46,834 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 56 transitions. [2021-05-02 13:01:46,834 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:46,834 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 56 transitions. [2021-05-02 13:01:46,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 13:01:46,834 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:46,834 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:47,047 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:47,047 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:47,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:47,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1745318674, now seen corresponding path program 1 times [2021-05-02 13:01:47,048 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:47,048 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049451806] [2021-05-02 13:01:47,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:47,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:47,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:47,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:47,163 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:01:47,163 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:47,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049451806] [2021-05-02 13:01:47,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1049451806] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:47,164 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635660910] [2021-05-02 13:01:47,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:47,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:47,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 13:01:47,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:47,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:47,292 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:01:47,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635660910] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:47,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:47,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 8 [2021-05-02 13:01:47,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609344334] [2021-05-02 13:01:47,292 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:01:47,293 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:47,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:01:47,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:01:47,293 INFO L87 Difference]: Start difference. First operand 41 states and 56 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:47,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:47,568 INFO L93 Difference]: Finished difference Result 59 states and 82 transitions. [2021-05-02 13:01:47,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:01:47,569 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 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 20 [2021-05-02 13:01:47,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:47,569 INFO L225 Difference]: With dead ends: 59 [2021-05-02 13:01:47,569 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 13:01:47,570 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 239.9ms TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:01:47,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 13:01:47,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 41. [2021-05-02 13:01:47,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 36 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:47,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 55 transitions. [2021-05-02 13:01:47,580 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 55 transitions. Word has length 20 [2021-05-02 13:01:47,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:47,582 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 55 transitions. [2021-05-02 13:01:47,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:47,582 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 55 transitions. [2021-05-02 13:01:47,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 13:01:47,584 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:47,584 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:47,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:47,800 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:47,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:47,800 INFO L82 PathProgramCache]: Analyzing trace with hash -2026119006, now seen corresponding path program 2 times [2021-05-02 13:01:47,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:47,801 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [649360638] [2021-05-02 13:01:47,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:47,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:47,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:47,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:47,894 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:01:47,896 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:47,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [649360638] [2021-05-02 13:01:47,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [649360638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:47,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423349865] [2021-05-02 13:01:47,897 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:47,956 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:47,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:47,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:01:47,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:48,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:48,037 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:48,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423349865] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:48,037 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:48,037 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 10 [2021-05-02 13:01:48,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195808100] [2021-05-02 13:01:48,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:01:48,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:48,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:01:48,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:01:48,038 INFO L87 Difference]: Start difference. First operand 41 states and 55 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:48,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:48,199 INFO L93 Difference]: Finished difference Result 87 states and 125 transitions. [2021-05-02 13:01:48,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:01:48,200 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 13:01:48,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:48,200 INFO L225 Difference]: With dead ends: 87 [2021-05-02 13:01:48,200 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 13:01:48,201 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 144.3ms TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:01:48,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 13:01:48,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 52. [2021-05-02 13:01:48,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.3829787234042554) internal successors, (65), 47 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:48,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 69 transitions. [2021-05-02 13:01:48,214 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 69 transitions. Word has length 20 [2021-05-02 13:01:48,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:48,215 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 69 transitions. [2021-05-02 13:01:48,215 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:48,215 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 69 transitions. [2021-05-02 13:01:48,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:01:48,219 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:48,219 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:48,432 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:48,433 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:48,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:48,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1695200847, now seen corresponding path program 1 times [2021-05-02 13:01:48,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:48,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042441739] [2021-05-02 13:01:48,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:48,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:48,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:48,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:48,512 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:01:48,512 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:48,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042441739] [2021-05-02 13:01:48,512 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042441739] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:48,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326064577] [2021-05-02 13:01:48,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:48,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:48,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 13:01:48,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:48,658 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:48,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326064577] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:48,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:48,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-05-02 13:01:48,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959043834] [2021-05-02 13:01:48,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:01:48,659 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:48,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:01:48,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:01:48,660 INFO L87 Difference]: Start difference. First operand 52 states and 69 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:48,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:48,859 INFO L93 Difference]: Finished difference Result 60 states and 77 transitions. [2021-05-02 13:01:48,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:01:48,859 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 13:01:48,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:48,859 INFO L225 Difference]: With dead ends: 60 [2021-05-02 13:01:48,859 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 13:01:48,860 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 15 SyntacticMatches, 6 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 191.0ms TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:01:48,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 13:01:48,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-02 13:01:48,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.375) internal successors, (66), 48 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:48,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 70 transitions. [2021-05-02 13:01:48,865 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 70 transitions. Word has length 21 [2021-05-02 13:01:48,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:48,865 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 70 transitions. [2021-05-02 13:01:48,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:48,865 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 70 transitions. [2021-05-02 13:01:48,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:01:48,865 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:48,865 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:49,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 13:01:49,077 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:49,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:49,077 INFO L82 PathProgramCache]: Analyzing trace with hash -1722153169, now seen corresponding path program 3 times [2021-05-02 13:01:49,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:49,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666455788] [2021-05-02 13:01:49,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:49,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:49,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:49,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:49,159 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:01:49,159 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:49,160 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666455788] [2021-05-02 13:01:49,160 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [666455788] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:49,160 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1100436622] [2021-05-02 13:01:49,160 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:49,203 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:01:49,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:49,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:01:49,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:49,238 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:01:49,239 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1100436622] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:01:49,239 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:01:49,239 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-05-02 13:01:49,240 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169954184] [2021-05-02 13:01:49,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:01:49,240 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:49,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:01:49,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:01:49,241 INFO L87 Difference]: Start difference. First operand 53 states and 70 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:49,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:49,267 INFO L93 Difference]: Finished difference Result 60 states and 77 transitions. [2021-05-02 13:01:49,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:01:49,267 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 2 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 21 [2021-05-02 13:01:49,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:49,268 INFO L225 Difference]: With dead ends: 60 [2021-05-02 13:01:49,268 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 13:01:49,269 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 66.4ms TimeCoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:01:49,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 13:01:49,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-02 13:01:49,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.3555555555555556) internal successors, (61), 45 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:49,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 65 transitions. [2021-05-02 13:01:49,276 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 65 transitions. Word has length 21 [2021-05-02 13:01:49,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:49,276 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 65 transitions. [2021-05-02 13:01:49,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:49,276 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 65 transitions. [2021-05-02 13:01:49,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:01:49,277 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:49,277 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:49,492 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:49,493 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:49,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:49,493 INFO L82 PathProgramCache]: Analyzing trace with hash 1309719759, now seen corresponding path program 1 times [2021-05-02 13:01:49,494 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:49,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089118101] [2021-05-02 13:01:49,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:49,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:49,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:49,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:49,584 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:01:49,584 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:49,584 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089118101] [2021-05-02 13:01:49,584 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1089118101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:49,584 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269510354] [2021-05-02 13:01:49,584 INFO L95 rtionOrderModulation]: Keeping assertion order 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 13:01:49,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:49,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 13:01:49,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:49,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:49,704 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:01:49,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269510354] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:49,704 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:49,704 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:01:49,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250049097] [2021-05-02 13:01:49,705 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:01:49,705 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:49,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:01:49,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:01:49,705 INFO L87 Difference]: Start difference. First operand 50 states and 65 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:50,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:50,033 INFO L93 Difference]: Finished difference Result 95 states and 133 transitions. [2021-05-02 13:01:50,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:01:50,033 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 13:01:50,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:50,033 INFO L225 Difference]: With dead ends: 95 [2021-05-02 13:01:50,034 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 13:01:50,034 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 231.9ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:01:50,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 13:01:50,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 56. [2021-05-02 13:01:50,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.3529411764705883) internal successors, (69), 51 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:50,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 73 transitions. [2021-05-02 13:01:50,037 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 73 transitions. Word has length 21 [2021-05-02 13:01:50,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:50,038 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 73 transitions. [2021-05-02 13:01:50,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:50,038 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 73 transitions. [2021-05-02 13:01:50,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:01:50,038 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:50,038 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:50,249 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:50,249 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:50,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:50,249 INFO L82 PathProgramCache]: Analyzing trace with hash -439116189, now seen corresponding path program 2 times [2021-05-02 13:01:50,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:50,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682557440] [2021-05-02 13:01:50,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:50,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:50,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:50,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:50,301 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:01:50,301 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:50,301 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682557440] [2021-05-02 13:01:50,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682557440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:50,301 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [420259714] [2021-05-02 13:01:50,301 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:50,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:50,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:50,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:01:50,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:50,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:50,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:50,384 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:01:50,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [420259714] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:50,384 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:50,384 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2021-05-02 13:01:50,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779309226] [2021-05-02 13:01:50,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:01:50,385 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:50,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:01:50,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:01:50,385 INFO L87 Difference]: Start difference. First operand 56 states and 73 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:50,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:50,467 INFO L93 Difference]: Finished difference Result 68 states and 89 transitions. [2021-05-02 13:01:50,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:01:50,467 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 13:01:50,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:50,468 INFO L225 Difference]: With dead ends: 68 [2021-05-02 13:01:50,468 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 13:01:50,468 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 54.3ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:01:50,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 13:01:50,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-02 13:01:50,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.3555555555555556) internal successors, (61), 45 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:50,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 65 transitions. [2021-05-02 13:01:50,474 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 65 transitions. Word has length 22 [2021-05-02 13:01:50,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:50,474 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 65 transitions. [2021-05-02 13:01:50,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:50,474 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 65 transitions. [2021-05-02 13:01:50,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:01:50,476 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:50,476 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:50,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 13:01:50,689 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:50,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:50,689 INFO L82 PathProgramCache]: Analyzing trace with hash 38994402, now seen corresponding path program 2 times [2021-05-02 13:01:50,689 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:50,689 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187613863] [2021-05-02 13:01:50,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:50,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:50,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:50,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:50,775 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:01:50,776 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:50,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187613863] [2021-05-02 13:01:50,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187613863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:50,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35016150] [2021-05-02 13:01:50,776 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:50,820 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:50,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:50,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:01:50,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:50,876 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:01:50,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35016150] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:50,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:50,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-05-02 13:01:50,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120104831] [2021-05-02 13:01:50,877 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:01:50,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:50,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:01:50,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:01:50,878 INFO L87 Difference]: Start difference. First operand 50 states and 65 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:51,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:51,057 INFO L93 Difference]: Finished difference Result 71 states and 92 transitions. [2021-05-02 13:01:51,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:01:51,057 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 13:01:51,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:51,058 INFO L225 Difference]: With dead ends: 71 [2021-05-02 13:01:51,058 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 13:01:51,058 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 174.8ms TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:01:51,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 13:01:51,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 47. [2021-05-02 13:01:51,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 42 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:51,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 61 transitions. [2021-05-02 13:01:51,061 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 61 transitions. Word has length 22 [2021-05-02 13:01:51,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:51,061 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 61 transitions. [2021-05-02 13:01:51,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:51,062 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 61 transitions. [2021-05-02 13:01:51,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:01:51,062 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:51,062 INFO L523 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:51,279 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:51,279 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:51,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:51,279 INFO L82 PathProgramCache]: Analyzing trace with hash 2142726114, now seen corresponding path program 2 times [2021-05-02 13:01:51,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:51,279 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239946380] [2021-05-02 13:01:51,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:51,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:51,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:51,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:51,368 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:01:51,368 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:51,368 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239946380] [2021-05-02 13:01:51,368 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239946380] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:51,368 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [261127834] [2021-05-02 13:01:51,368 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:51,409 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:51,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:51,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 13:01:51,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:51,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:51,464 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:01:51,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [261127834] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:51,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:51,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 13:01:51,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524466094] [2021-05-02 13:01:51,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:01:51,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:51,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:01:51,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:01:51,467 INFO L87 Difference]: Start difference. First operand 47 states and 61 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:51,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:51,800 INFO L93 Difference]: Finished difference Result 92 states and 130 transitions. [2021-05-02 13:01:51,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:01:51,800 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 13:01:51,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:51,801 INFO L225 Difference]: With dead ends: 92 [2021-05-02 13:01:51,801 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 13:01:51,802 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 222.4ms TimeCoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:01:51,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 13:01:51,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 53. [2021-05-02 13:01:51,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.3541666666666667) internal successors, (65), 48 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:51,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 69 transitions. [2021-05-02 13:01:51,806 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 69 transitions. Word has length 22 [2021-05-02 13:01:51,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:51,807 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 69 transitions. [2021-05-02 13:01:51,807 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:51,807 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 69 transitions. [2021-05-02 13:01:51,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 13:01:51,807 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:51,807 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:52,016 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:01:52,017 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:52,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:52,017 INFO L82 PathProgramCache]: Analyzing trace with hash -1409588607, now seen corresponding path program 2 times [2021-05-02 13:01:52,017 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:52,017 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637382884] [2021-05-02 13:01:52,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:52,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:52,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:52,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:52,117 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:52,117 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:52,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637382884] [2021-05-02 13:01:52,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637382884] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:52,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544113008] [2021-05-02 13:01:52,117 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:52,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:52,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:52,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:01:52,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:52,215 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:01:52,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544113008] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:52,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:52,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5] total 13 [2021-05-02 13:01:52,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850251277] [2021-05-02 13:01:52,215 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:01:52,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:52,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:01:52,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:01:52,216 INFO L87 Difference]: Start difference. First operand 53 states and 69 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 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 13:01:52,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:52,954 INFO L93 Difference]: Finished difference Result 97 states and 136 transitions. [2021-05-02 13:01:52,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:01:52,955 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 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 23 [2021-05-02 13:01:52,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:52,955 INFO L225 Difference]: With dead ends: 97 [2021-05-02 13:01:52,955 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 13:01:52,956 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 640.6ms TimeCoverageRelationStatistics Valid=194, Invalid=862, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:01:52,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 13:01:52,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 71. [2021-05-02 13:01:52,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.3333333333333333) internal successors, (88), 66 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:52,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 92 transitions. [2021-05-02 13:01:52,960 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 92 transitions. Word has length 23 [2021-05-02 13:01:52,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:52,960 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 92 transitions. [2021-05-02 13:01:52,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 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 13:01:52,960 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 92 transitions. [2021-05-02 13:01:52,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 13:01:52,960 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:52,960 INFO L523 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:53,161 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 13:01:53,161 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:53,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:53,161 INFO L82 PathProgramCache]: Analyzing trace with hash -2098847953, now seen corresponding path program 3 times [2021-05-02 13:01:53,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:53,161 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203940509] [2021-05-02 13:01:53,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:53,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:53,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:53,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:53,263 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:01:53,263 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:53,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203940509] [2021-05-02 13:01:53,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [203940509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:53,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721044273] [2021-05-02 13:01:53,263 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:53,295 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:01:53,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:53,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:01:53,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:53,337 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:01:53,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721044273] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:53,337 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:53,337 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 4] total 13 [2021-05-02 13:01:53,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600871631] [2021-05-02 13:01:53,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:01:53,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:53,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:01:53,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:01:53,338 INFO L87 Difference]: Start difference. First operand 71 states and 92 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:53,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:53,962 INFO L93 Difference]: Finished difference Result 154 states and 218 transitions. [2021-05-02 13:01:53,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:01:53,963 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 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 23 [2021-05-02 13:01:53,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:53,963 INFO L225 Difference]: With dead ends: 154 [2021-05-02 13:01:53,963 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 13:01:53,964 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 445.8ms TimeCoverageRelationStatistics Valid=130, Invalid=572, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:01:53,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 13:01:53,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 75. [2021-05-02 13:01:53,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.3) internal successors, (91), 70 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:53,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 95 transitions. [2021-05-02 13:01:53,969 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 95 transitions. Word has length 23 [2021-05-02 13:01:53,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:53,969 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 95 transitions. [2021-05-02 13:01:53,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:53,969 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 95 transitions. [2021-05-02 13:01:53,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 13:01:53,970 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:53,970 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:54,184 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 13:01:54,185 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:54,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:54,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1097749168, now seen corresponding path program 3 times [2021-05-02 13:01:54,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:54,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062299187] [2021-05-02 13:01:54,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:54,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:54,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:54,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:54,246 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:01:54,246 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:54,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062299187] [2021-05-02 13:01:54,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062299187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:54,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249434265] [2021-05-02 13:01:54,247 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:54,294 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:01:54,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:54,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:01:54,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:54,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:54,352 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:01:54,352 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [249434265] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:54,352 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:54,352 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2021-05-02 13:01:54,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909817559] [2021-05-02 13:01:54,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:01:54,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:54,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:01:54,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:01:54,353 INFO L87 Difference]: Start difference. First operand 75 states and 95 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:54,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:54,528 INFO L93 Difference]: Finished difference Result 86 states and 108 transitions. [2021-05-02 13:01:54,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:01:54,528 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 13:01:54,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:54,529 INFO L225 Difference]: With dead ends: 86 [2021-05-02 13:01:54,529 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 13:01:54,530 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 125.4ms TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:01:54,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 13:01:54,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-02 13:01:54,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.2916666666666667) internal successors, (93), 72 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:54,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 97 transitions. [2021-05-02 13:01:54,534 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 97 transitions. Word has length 25 [2021-05-02 13:01:54,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:54,534 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 97 transitions. [2021-05-02 13:01:54,535 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:54,535 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 97 transitions. [2021-05-02 13:01:54,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 13:01:54,535 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:54,535 INFO L523 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:54,741 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 13:01:54,741 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:54,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:54,741 INFO L82 PathProgramCache]: Analyzing trace with hash 67192415, now seen corresponding path program 3 times [2021-05-02 13:01:54,741 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:54,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634655026] [2021-05-02 13:01:54,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:54,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:54,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:54,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:54,874 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:01:54,874 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:54,874 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634655026] [2021-05-02 13:01:54,874 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634655026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:54,874 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437041871] [2021-05-02 13:01:54,874 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:54,910 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:01:54,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:54,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:01:54,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:54,971 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:01:54,972 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437041871] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:54,972 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:54,972 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 5] total 15 [2021-05-02 13:01:54,972 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692850115] [2021-05-02 13:01:54,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:01:54,972 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:54,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:01:54,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:01:54,973 INFO L87 Difference]: Start difference. First operand 77 states and 97 transitions. Second operand has 15 states, 15 states have (on average 2.2) internal successors, (33), 14 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 13:01:56,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:56,277 INFO L93 Difference]: Finished difference Result 154 states and 210 transitions. [2021-05-02 13:01:56,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:01:56,277 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 14 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 25 [2021-05-02 13:01:56,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:56,278 INFO L225 Difference]: With dead ends: 154 [2021-05-02 13:01:56,278 INFO L226 Difference]: Without dead ends: 130 [2021-05-02 13:01:56,279 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 923.0ms TimeCoverageRelationStatistics Valid=200, Invalid=1282, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:01:56,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-02 13:01:56,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 81. [2021-05-02 13:01:56,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.2763157894736843) internal successors, (97), 76 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:56,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 101 transitions. [2021-05-02 13:01:56,287 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 101 transitions. Word has length 25 [2021-05-02 13:01:56,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:56,287 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 101 transitions. [2021-05-02 13:01:56,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 14 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 13:01:56,287 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 101 transitions. [2021-05-02 13:01:56,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 13:01:56,287 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:56,287 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:56,501 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:56,501 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:56,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:56,501 INFO L82 PathProgramCache]: Analyzing trace with hash -137630238, now seen corresponding path program 4 times [2021-05-02 13:01:56,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:56,501 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458842079] [2021-05-02 13:01:56,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:56,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:56,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:56,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:56,617 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:01:56,617 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:56,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458842079] [2021-05-02 13:01:56,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458842079] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:56,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [247208012] [2021-05-02 13:01:56,617 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:56,681 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:01:56,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:56,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:01:56,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:56,778 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:56,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [247208012] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:56,779 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:56,779 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 14 [2021-05-02 13:01:56,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043174245] [2021-05-02 13:01:56,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:01:56,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:56,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:01:56,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:01:56,780 INFO L87 Difference]: Start difference. First operand 81 states and 101 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:57,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:57,055 INFO L93 Difference]: Finished difference Result 90 states and 110 transitions. [2021-05-02 13:01:57,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:01:57,056 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 13:01:57,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:57,056 INFO L225 Difference]: With dead ends: 90 [2021-05-02 13:01:57,056 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 13:01:57,057 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 22 SyntacticMatches, 6 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 263.3ms TimeCoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:01:57,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 13:01:57,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-05-02 13:01:57,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.2727272727272727) internal successors, (98), 77 states have internal predecessors, (98), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:57,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 102 transitions. [2021-05-02 13:01:57,062 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 102 transitions. Word has length 26 [2021-05-02 13:01:57,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:57,062 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 102 transitions. [2021-05-02 13:01:57,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:57,062 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 102 transitions. [2021-05-02 13:01:57,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 13:01:57,062 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:57,062 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:57,268 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:57,269 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:57,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:57,269 INFO L82 PathProgramCache]: Analyzing trace with hash -197432477, now seen corresponding path program 3 times [2021-05-02 13:01:57,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:57,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869854965] [2021-05-02 13:01:57,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:57,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:57,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:57,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:57,380 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:57,380 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:57,380 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869854965] [2021-05-02 13:01:57,380 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869854965] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:57,380 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327018567] [2021-05-02 13:01:57,381 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:57,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:01:57,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:57,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:01:57,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:57,527 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:01:57,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327018567] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:57,528 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:57,528 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 6] total 16 [2021-05-02 13:01:57,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740578999] [2021-05-02 13:01:57,530 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:01:57,530 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:57,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:01:57,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:01:57,531 INFO L87 Difference]: Start difference. First operand 82 states and 102 transitions. Second operand has 16 states, 16 states have (on average 2.375) internal successors, (38), 15 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 13:01:59,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:59,407 INFO L93 Difference]: Finished difference Result 141 states and 191 transitions. [2021-05-02 13:01:59,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 13:01:59,407 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.375) internal successors, (38), 15 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 26 [2021-05-02 13:01:59,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:59,408 INFO L225 Difference]: With dead ends: 141 [2021-05-02 13:01:59,408 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 13:01:59,409 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 767 ImplicationChecksByTransitivity, 1598.4ms TimeCoverageRelationStatistics Valid=454, Invalid=2626, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:01:59,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 13:01:59,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 102. [2021-05-02 13:01:59,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 97 states have (on average 1.268041237113402) internal successors, (123), 97 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:59,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 127 transitions. [2021-05-02 13:01:59,414 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 127 transitions. Word has length 26 [2021-05-02 13:01:59,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:59,414 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 127 transitions. [2021-05-02 13:01:59,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.375) internal successors, (38), 15 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 13:01:59,414 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 127 transitions. [2021-05-02 13:01:59,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:01:59,415 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:59,415 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:59,615 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:59,615 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:59,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:59,616 INFO L82 PathProgramCache]: Analyzing trace with hash -438714480, now seen corresponding path program 5 times [2021-05-02 13:01:59,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:59,616 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639153335] [2021-05-02 13:01:59,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:59,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:59,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:59,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:59,672 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:01:59,672 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:59,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639153335] [2021-05-02 13:01:59,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1639153335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:59,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782332648] [2021-05-02 13:01:59,672 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 13:01:59,730 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 13:01:59,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:59,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:01:59,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:59,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:59,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:59,794 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:01:59,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1782332648] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:59,794 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:59,794 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2021-05-02 13:01:59,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074269310] [2021-05-02 13:01:59,795 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:01:59,795 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:59,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:01:59,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:01:59,795 INFO L87 Difference]: Start difference. First operand 102 states and 127 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:59,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:59,900 INFO L93 Difference]: Finished difference Result 114 states and 141 transitions. [2021-05-02 13:01:59,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:01:59,901 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 13:01:59,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:59,902 INFO L225 Difference]: With dead ends: 114 [2021-05-02 13:01:59,902 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 13:01:59,902 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 75.9ms TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:01:59,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 13:01:59,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2021-05-02 13:01:59,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.2790697674418605) internal successors, (110), 86 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:59,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 114 transitions. [2021-05-02 13:01:59,907 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 114 transitions. Word has length 27 [2021-05-02 13:01:59,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:59,907 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 114 transitions. [2021-05-02 13:01:59,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:59,907 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 114 transitions. [2021-05-02 13:01:59,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:01:59,907 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:59,908 INFO L523 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:00,116 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 13:02:00,117 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:00,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:00,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1366173905, now seen corresponding path program 6 times [2021-05-02 13:02:00,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:00,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204002407] [2021-05-02 13:02:00,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:00,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:00,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:00,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:00,237 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:02:00,237 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:00,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204002407] [2021-05-02 13:02:00,238 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204002407] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:00,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103737589] [2021-05-02 13:02:00,238 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 13:02:00,272 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 13:02:00,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:00,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:02:00,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:00,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:00,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:00,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:00,415 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 13:02:00,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103737589] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:00,415 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:00,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 19 [2021-05-02 13:02:00,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296395796] [2021-05-02 13:02:00,415 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:02:00,415 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:00,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:02:00,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=304, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:02:00,416 INFO L87 Difference]: Start difference. First operand 91 states and 114 transitions. Second operand has 19 states, 19 states have (on average 2.0) internal successors, (38), 17 states have internal predecessors, (38), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:01,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:01,683 INFO L93 Difference]: Finished difference Result 211 states and 292 transitions. [2021-05-02 13:02:01,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:02:01,683 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 17 states have internal predecessors, (38), 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 27 [2021-05-02 13:02:01,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:01,685 INFO L225 Difference]: With dead ends: 211 [2021-05-02 13:02:01,685 INFO L226 Difference]: Without dead ends: 182 [2021-05-02 13:02:01,685 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 824.4ms TimeCoverageRelationStatistics Valid=181, Invalid=1711, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 13:02:01,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-02 13:02:01,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 131. [2021-05-02 13:02:01,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.3492063492063493) internal successors, (170), 126 states have internal predecessors, (170), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:01,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 174 transitions. [2021-05-02 13:02:01,693 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 174 transitions. Word has length 27 [2021-05-02 13:02:01,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:01,693 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 174 transitions. [2021-05-02 13:02:01,693 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 17 states have internal predecessors, (38), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:01,693 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 174 transitions. [2021-05-02 13:02:01,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 13:02:01,694 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:01,694 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:01,913 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 13:02:01,913 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:01,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:01,913 INFO L82 PathProgramCache]: Analyzing trace with hash 2128187618, now seen corresponding path program 4 times [2021-05-02 13:02:01,913 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:01,913 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235559801] [2021-05-02 13:02:01,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:01,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:02,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:02,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:02,041 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-05-02 13:02:02,041 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:02,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235559801] [2021-05-02 13:02:02,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1235559801] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:02,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228354428] [2021-05-02 13:02:02,041 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 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 13:02:02,083 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:02:02,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:02,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 13:02:02,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:02,171 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 13:02:02,171 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228354428] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:02,171 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:02,171 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 6] total 16 [2021-05-02 13:02:02,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508703038] [2021-05-02 13:02:02,172 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:02:02,172 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:02,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:02:02,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=208, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:02:02,172 INFO L87 Difference]: Start difference. First operand 131 states and 174 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:03,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:03,506 INFO L93 Difference]: Finished difference Result 192 states and 262 transitions. [2021-05-02 13:02:03,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 13:02:03,506 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 13:02:03,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:03,508 INFO L225 Difference]: With dead ends: 192 [2021-05-02 13:02:03,508 INFO L226 Difference]: Without dead ends: 160 [2021-05-02 13:02:03,509 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1074.3ms TimeCoverageRelationStatistics Valid=314, Invalid=1942, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:02:03,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-05-02 13:02:03,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 133. [2021-05-02 13:02:03,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.328125) internal successors, (170), 128 states have internal predecessors, (170), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:03,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2021-05-02 13:02:03,529 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 28 [2021-05-02 13:02:03,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:03,529 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2021-05-02 13:02:03,529 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:03,529 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2021-05-02 13:02:03,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 13:02:03,530 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:03,530 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:03,732 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 13:02:03,732 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:03,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:03,733 INFO L82 PathProgramCache]: Analyzing trace with hash -409683135, now seen corresponding path program 4 times [2021-05-02 13:02:03,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:03,733 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322039353] [2021-05-02 13:02:03,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:03,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:03,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:03,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:03,862 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:03,862 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:03,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322039353] [2021-05-02 13:02:03,862 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322039353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:03,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128025499] [2021-05-02 13:02:03,862 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:03,902 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:02:03,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:03,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 13:02:03,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:04,033 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-05-02 13:02:04,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [128025499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:04,033 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:04,033 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 7] total 19 [2021-05-02 13:02:04,033 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452806851] [2021-05-02 13:02:04,034 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:02:04,034 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:04,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:02:04,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:02:04,035 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:07,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:07,629 INFO L93 Difference]: Finished difference Result 240 states and 349 transitions. [2021-05-02 13:02:07,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 13:02:07,629 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 13:02:07,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:07,630 INFO L225 Difference]: With dead ends: 240 [2021-05-02 13:02:07,630 INFO L226 Difference]: Without dead ends: 206 [2021-05-02 13:02:07,631 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1510 ImplicationChecksByTransitivity, 3092.3ms TimeCoverageRelationStatistics Valid=710, Invalid=4840, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 13:02:07,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-05-02 13:02:07,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 161. [2021-05-02 13:02:07,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 156 states have (on average 1.3205128205128205) internal successors, (206), 156 states have internal predecessors, (206), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:07,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 210 transitions. [2021-05-02 13:02:07,638 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 210 transitions. Word has length 29 [2021-05-02 13:02:07,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:07,638 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 210 transitions. [2021-05-02 13:02:07,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:07,638 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 210 transitions. [2021-05-02 13:02:07,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 13:02:07,638 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:07,638 INFO L523 BasicCegarLoop]: trace histogram [8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:07,841 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 13:02:07,841 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:07,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:07,841 INFO L82 PathProgramCache]: Analyzing trace with hash -995191457, now seen corresponding path program 7 times [2021-05-02 13:02:07,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:07,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134489294] [2021-05-02 13:02:07,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:07,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:07,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:07,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:07,973 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 13:02:07,973 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:07,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134489294] [2021-05-02 13:02:07,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134489294] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:07,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1564318340] [2021-05-02 13:02:07,973 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 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 13:02:08,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:08,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 13:02:08,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:08,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:08,081 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 13:02:08,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1564318340] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:08,082 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:08,082 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 13:02:08,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910548621] [2021-05-02 13:02:08,083 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:02:08,083 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:08,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:02:08,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:02:08,083 INFO L87 Difference]: Start difference. First operand 161 states and 210 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:08,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:08,753 INFO L93 Difference]: Finished difference Result 308 states and 431 transitions. [2021-05-02 13:02:08,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:02:08,753 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 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 29 [2021-05-02 13:02:08,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:08,754 INFO L225 Difference]: With dead ends: 308 [2021-05-02 13:02:08,754 INFO L226 Difference]: Without dead ends: 282 [2021-05-02 13:02:08,754 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 361.5ms TimeCoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:02:08,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2021-05-02 13:02:08,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 205. [2021-05-02 13:02:08,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 200 states have (on average 1.275) internal successors, (255), 200 states have internal predecessors, (255), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:08,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 259 transitions. [2021-05-02 13:02:08,762 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 259 transitions. Word has length 29 [2021-05-02 13:02:08,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:08,763 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 259 transitions. [2021-05-02 13:02:08,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:08,763 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 259 transitions. [2021-05-02 13:02:08,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 13:02:08,763 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:08,763 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:08,966 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 13:02:08,967 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:08,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:08,967 INFO L82 PathProgramCache]: Analyzing trace with hash -1456672573, now seen corresponding path program 8 times [2021-05-02 13:02:08,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:08,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477574004] [2021-05-02 13:02:08,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:08,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:09,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:09,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:09,050 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:02:09,050 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:09,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477574004] [2021-05-02 13:02:09,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477574004] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:09,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056232857] [2021-05-02 13:02:09,050 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:09,106 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:02:09,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:09,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 13:02:09,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:09,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:09,156 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:02:09,156 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056232857] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:09,156 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:09,156 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 7 [2021-05-02 13:02:09,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368652891] [2021-05-02 13:02:09,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:02:09,157 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:09,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:02:09,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:02:09,157 INFO L87 Difference]: Start difference. First operand 205 states and 259 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:09,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:09,419 INFO L93 Difference]: Finished difference Result 220 states and 278 transitions. [2021-05-02 13:02:09,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:02:09,419 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 13:02:09,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:09,420 INFO L225 Difference]: With dead ends: 220 [2021-05-02 13:02:09,420 INFO L226 Difference]: Without dead ends: 207 [2021-05-02 13:02:09,420 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 204.3ms TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:02:09,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-05-02 13:02:09,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2021-05-02 13:02:09,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 202 states have (on average 1.2673267326732673) internal successors, (256), 202 states have internal predecessors, (256), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:09,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 260 transitions. [2021-05-02 13:02:09,428 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 260 transitions. Word has length 30 [2021-05-02 13:02:09,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:09,428 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 260 transitions. [2021-05-02 13:02:09,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:09,428 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 260 transitions. [2021-05-02 13:02:09,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 13:02:09,428 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:09,429 INFO L523 BasicCegarLoop]: trace histogram [9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:09,634 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:09,634 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:09,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:09,635 INFO L82 PathProgramCache]: Analyzing trace with hash -1483833998, now seen corresponding path program 9 times [2021-05-02 13:02:09,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:09,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815130805] [2021-05-02 13:02:09,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:09,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:09,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:09,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:09,777 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 13:02:09,777 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:09,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815130805] [2021-05-02 13:02:09,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815130805] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:09,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979265819] [2021-05-02 13:02:09,777 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 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 13:02:09,816 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:02:09,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:09,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 13:02:09,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:09,931 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-05-02 13:02:09,931 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [979265819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:09,932 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:09,932 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 7] total 20 [2021-05-02 13:02:09,932 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947715520] [2021-05-02 13:02:09,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 13:02:09,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:09,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 13:02:09,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:02:09,932 INFO L87 Difference]: Start difference. First operand 207 states and 260 transitions. Second operand has 20 states, 20 states have (on average 1.9) internal successors, (38), 19 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 13:02:12,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:12,135 INFO L93 Difference]: Finished difference Result 402 states and 547 transitions. [2021-05-02 13:02:12,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 13:02:12,135 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.9) internal successors, (38), 19 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 30 [2021-05-02 13:02:12,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:12,136 INFO L225 Difference]: With dead ends: 402 [2021-05-02 13:02:12,136 INFO L226 Difference]: Without dead ends: 367 [2021-05-02 13:02:12,137 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1143 ImplicationChecksByTransitivity, 1514.9ms TimeCoverageRelationStatistics Valid=342, Invalid=4350, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 13:02:12,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2021-05-02 13:02:12,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 226. [2021-05-02 13:02:12,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 221 states have (on average 1.2895927601809956) internal successors, (285), 221 states have internal predecessors, (285), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:12,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 289 transitions. [2021-05-02 13:02:12,147 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 289 transitions. Word has length 30 [2021-05-02 13:02:12,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:12,147 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 289 transitions. [2021-05-02 13:02:12,147 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.9) internal successors, (38), 19 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 13:02:12,147 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 289 transitions. [2021-05-02 13:02:12,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 13:02:12,147 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:12,147 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:12,364 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 13:02:12,365 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:12,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:12,365 INFO L82 PathProgramCache]: Analyzing trace with hash -604600770, now seen corresponding path program 5 times [2021-05-02 13:02:12,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:12,365 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452817870] [2021-05-02 13:02:12,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:12,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:12,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:12,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:12,510 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:02:12,510 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:12,510 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452817870] [2021-05-02 13:02:12,510 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452817870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:12,510 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658597373] [2021-05-02 13:02:12,510 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:12,568 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 13:02:12,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:12,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 13:02:12,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:12,693 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 14 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-02 13:02:12,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658597373] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:12,694 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:12,694 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 7] total 19 [2021-05-02 13:02:12,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81888742] [2021-05-02 13:02:12,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:02:12,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:12,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:02:12,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=303, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:02:12,695 INFO L87 Difference]: Start difference. First operand 226 states and 289 transitions. Second operand has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 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 13:02:15,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:15,127 INFO L93 Difference]: Finished difference Result 318 states and 414 transitions. [2021-05-02 13:02:15,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 13:02:15,128 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 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 31 [2021-05-02 13:02:15,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:15,128 INFO L225 Difference]: With dead ends: 318 [2021-05-02 13:02:15,128 INFO L226 Difference]: Without dead ends: 275 [2021-05-02 13:02:15,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1147 ImplicationChecksByTransitivity, 2039.1ms TimeCoverageRelationStatistics Valid=534, Invalid=3888, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 13:02:15,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2021-05-02 13:02:15,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 226. [2021-05-02 13:02:15,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 221 states have (on average 1.2760180995475112) internal successors, (282), 221 states have internal predecessors, (282), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:15,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 286 transitions. [2021-05-02 13:02:15,138 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 286 transitions. Word has length 31 [2021-05-02 13:02:15,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:15,138 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 286 transitions. [2021-05-02 13:02:15,139 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 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 13:02:15,139 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 286 transitions. [2021-05-02 13:02:15,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:02:15,139 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:15,139 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:15,354 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:15,354 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:15,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:15,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1990656643, now seen corresponding path program 10 times [2021-05-02 13:02:15,355 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:15,355 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737394796] [2021-05-02 13:02:15,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:15,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:15,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:15,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:15,430 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-02 13:02:15,431 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:15,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737394796] [2021-05-02 13:02:15,431 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1737394796] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:15,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342050002] [2021-05-02 13:02:15,431 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:15,495 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:02:15,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:15,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:02:15,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:15,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:15,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:15,556 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-02 13:02:15,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342050002] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:15,556 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:15,556 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 7 [2021-05-02 13:02:15,556 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453894456] [2021-05-02 13:02:15,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:02:15,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:15,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:02:15,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:02:15,557 INFO L87 Difference]: Start difference. First operand 226 states and 286 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 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 13:02:15,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:15,726 INFO L93 Difference]: Finished difference Result 257 states and 333 transitions. [2021-05-02 13:02:15,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:02:15,726 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 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 32 [2021-05-02 13:02:15,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:15,727 INFO L225 Difference]: With dead ends: 257 [2021-05-02 13:02:15,727 INFO L226 Difference]: Without dead ends: 219 [2021-05-02 13:02:15,728 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 104.9ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:02:15,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-05-02 13:02:15,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 213. [2021-05-02 13:02:15,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 208 states have (on average 1.2836538461538463) internal successors, (267), 208 states have internal predecessors, (267), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:15,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 271 transitions. [2021-05-02 13:02:15,738 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 271 transitions. Word has length 32 [2021-05-02 13:02:15,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:15,738 INFO L480 AbstractCegarLoop]: Abstraction has 213 states and 271 transitions. [2021-05-02 13:02:15,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 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 13:02:15,738 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 271 transitions. [2021-05-02 13:02:15,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:02:15,739 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:15,739 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:15,954 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 13:02:15,954 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:15,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:15,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1032467933, now seen corresponding path program 5 times [2021-05-02 13:02:15,954 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:15,954 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838762616] [2021-05-02 13:02:15,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:15,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:16,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:16,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:16,120 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:16,120 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:16,120 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838762616] [2021-05-02 13:02:16,120 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [838762616] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:16,120 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705375231] [2021-05-02 13:02:16,120 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:02:16,251 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 13:02:16,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:16,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 13:02:16,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:16,412 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:02:16,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [705375231] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:16,412 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:16,412 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 8] total 22 [2021-05-02 13:02:16,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370317575] [2021-05-02 13:02:16,413 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:02:16,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:16,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:02:16,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:02:16,414 INFO L87 Difference]: Start difference. First operand 213 states and 271 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:21,665 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:02:22,426 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:02:22,600 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:02:23,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:23,458 INFO L93 Difference]: Finished difference Result 356 states and 493 transitions. [2021-05-02 13:02:23,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-02 13:02:23,459 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 13:02:23,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:23,459 INFO L225 Difference]: With dead ends: 356 [2021-05-02 13:02:23,459 INFO L226 Difference]: Without dead ends: 318 [2021-05-02 13:02:23,461 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2583 ImplicationChecksByTransitivity, 6263.3ms TimeCoverageRelationStatistics Valid=1028, Invalid=7902, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 13:02:23,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-05-02 13:02:23,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 255. [2021-05-02 13:02:23,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 250 states have (on average 1.28) internal successors, (320), 250 states have internal predecessors, (320), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:23,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 324 transitions. [2021-05-02 13:02:23,470 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 324 transitions. Word has length 32 [2021-05-02 13:02:23,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:23,470 INFO L480 AbstractCegarLoop]: Abstraction has 255 states and 324 transitions. [2021-05-02 13:02:23,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:23,470 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 324 transitions. [2021-05-02 13:02:23,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:02:23,471 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:23,471 INFO L523 BasicCegarLoop]: trace histogram [10, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:23,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:23,674 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:23,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:23,674 INFO L82 PathProgramCache]: Analyzing trace with hash 873461474, now seen corresponding path program 11 times [2021-05-02 13:02:23,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:23,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1384890819] [2021-05-02 13:02:23,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:23,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:23,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:23,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:23,877 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 13:02:23,877 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:23,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1384890819] [2021-05-02 13:02:23,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1384890819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:23,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231475137] [2021-05-02 13:02:23,877 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 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 13:02:24,159 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 13:02:24,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:24,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:02:24,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:24,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:24,225 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 13:02:24,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231475137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:24,225 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:24,225 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 13:02:24,225 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534694437] [2021-05-02 13:02:24,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:02:24,225 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:24,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:02:24,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=270, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:02:24,226 INFO L87 Difference]: Start difference. First operand 255 states and 324 transitions. Second operand has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:25,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:25,337 INFO L93 Difference]: Finished difference Result 448 states and 609 transitions. [2021-05-02 13:02:25,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:02:25,338 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 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 32 [2021-05-02 13:02:25,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:25,339 INFO L225 Difference]: With dead ends: 448 [2021-05-02 13:02:25,339 INFO L226 Difference]: Without dead ends: 413 [2021-05-02 13:02:25,339 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 569.9ms TimeCoverageRelationStatistics Valid=122, Invalid=1068, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:02:25,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2021-05-02 13:02:25,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 268. [2021-05-02 13:02:25,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 263 states have (on average 1.285171102661597) internal successors, (338), 263 states have internal predecessors, (338), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:25,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 342 transitions. [2021-05-02 13:02:25,349 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 342 transitions. Word has length 32 [2021-05-02 13:02:25,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:25,349 INFO L480 AbstractCegarLoop]: Abstraction has 268 states and 342 transitions. [2021-05-02 13:02:25,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:25,350 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 342 transitions. [2021-05-02 13:02:25,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 13:02:25,350 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:25,350 INFO L523 BasicCegarLoop]: trace histogram [11, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:25,553 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 13:02:25,553 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:25,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:25,554 INFO L82 PathProgramCache]: Analyzing trace with hash -632311313, now seen corresponding path program 12 times [2021-05-02 13:02:25,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:25,554 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973930773] [2021-05-02 13:02:25,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:25,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:25,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:25,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:25,745 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 69 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 13:02:25,745 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:25,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973930773] [2021-05-02 13:02:25,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973930773] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:25,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291720580] [2021-05-02 13:02:25,745 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 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 13:02:25,793 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 13:02:25,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:25,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:02:25,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:25,894 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 13:02:25,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1291720580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:25,895 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:25,895 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 6] total 22 [2021-05-02 13:02:25,895 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267945307] [2021-05-02 13:02:25,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:02:25,895 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:25,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:02:25,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=397, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:02:25,896 INFO L87 Difference]: Start difference. First operand 268 states and 342 transitions. Second operand has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 21 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 13:02:27,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:27,880 INFO L93 Difference]: Finished difference Result 502 states and 685 transitions. [2021-05-02 13:02:27,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 13:02:27,887 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 21 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 33 [2021-05-02 13:02:27,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:27,888 INFO L225 Difference]: With dead ends: 502 [2021-05-02 13:02:27,888 INFO L226 Difference]: Without dead ends: 467 [2021-05-02 13:02:27,889 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 699 ImplicationChecksByTransitivity, 1333.1ms TimeCoverageRelationStatistics Valid=457, Invalid=2965, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:02:27,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2021-05-02 13:02:27,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 273. [2021-05-02 13:02:27,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 268 states have (on average 1.2723880597014925) internal successors, (341), 268 states have internal predecessors, (341), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:27,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 345 transitions. [2021-05-02 13:02:27,900 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 345 transitions. Word has length 33 [2021-05-02 13:02:27,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:27,901 INFO L480 AbstractCegarLoop]: Abstraction has 273 states and 345 transitions. [2021-05-02 13:02:27,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 21 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 13:02:27,901 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 345 transitions. [2021-05-02 13:02:27,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:02:27,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:27,901 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:28,111 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:28,111 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:28,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:28,112 INFO L82 PathProgramCache]: Analyzing trace with hash 74673410, now seen corresponding path program 13 times [2021-05-02 13:02:28,112 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:28,112 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22358291] [2021-05-02 13:02:28,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:28,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:28,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:28,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:28,263 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:02:28,263 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:28,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22358291] [2021-05-02 13:02:28,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [22358291] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:28,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126621680] [2021-05-02 13:02:28,263 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 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 13:02:28,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:28,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:02:28,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:28,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:28,415 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-05-02 13:02:28,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126621680] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:28,415 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:28,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 16 [2021-05-02 13:02:28,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55389718] [2021-05-02 13:02:28,417 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:02:28,417 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:28,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:02:28,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:02:28,418 INFO L87 Difference]: Start difference. First operand 273 states and 345 transitions. Second operand has 16 states, 16 states have (on average 2.4375) internal successors, (39), 15 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:29,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:29,095 INFO L93 Difference]: Finished difference Result 333 states and 430 transitions. [2021-05-02 13:02:29,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 13:02:29,095 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.4375) internal successors, (39), 15 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 13:02:29,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:29,096 INFO L225 Difference]: With dead ends: 333 [2021-05-02 13:02:29,096 INFO L226 Difference]: Without dead ends: 317 [2021-05-02 13:02:29,097 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 558.5ms TimeCoverageRelationStatistics Valid=210, Invalid=720, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:02:29,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-05-02 13:02:29,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 312. [2021-05-02 13:02:29,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 307 states have (on average 1.263843648208469) internal successors, (388), 307 states have internal predecessors, (388), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:29,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 392 transitions. [2021-05-02 13:02:29,108 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 392 transitions. Word has length 34 [2021-05-02 13:02:29,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:29,109 INFO L480 AbstractCegarLoop]: Abstraction has 312 states and 392 transitions. [2021-05-02 13:02:29,109 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.4375) internal successors, (39), 15 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:29,109 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 392 transitions. [2021-05-02 13:02:29,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:02:29,109 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:29,109 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:29,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 13:02:29,324 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:29,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:29,325 INFO L82 PathProgramCache]: Analyzing trace with hash 1655978978, now seen corresponding path program 6 times [2021-05-02 13:02:29,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:29,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950957290] [2021-05-02 13:02:29,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:29,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:29,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:29,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:29,465 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-05-02 13:02:29,465 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:29,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950957290] [2021-05-02 13:02:29,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950957290] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:29,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503514630] [2021-05-02 13:02:29,466 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 13:02:29,538 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:02:29,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:29,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:02:29,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:29,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:29,617 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-05-02 13:02:29,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503514630] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:29,617 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:29,617 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 13:02:29,617 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214154557] [2021-05-02 13:02:29,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:02:29,618 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:29,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:02:29,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:02:29,618 INFO L87 Difference]: Start difference. First operand 312 states and 392 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:30,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:30,334 INFO L93 Difference]: Finished difference Result 413 states and 514 transitions. [2021-05-02 13:02:30,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:02:30,334 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 13:02:30,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:30,335 INFO L225 Difference]: With dead ends: 413 [2021-05-02 13:02:30,335 INFO L226 Difference]: Without dead ends: 392 [2021-05-02 13:02:30,336 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 481.0ms TimeCoverageRelationStatistics Valid=122, Invalid=808, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:02:30,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2021-05-02 13:02:30,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 312. [2021-05-02 13:02:30,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 307 states have (on average 1.260586319218241) internal successors, (387), 307 states have internal predecessors, (387), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:30,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 391 transitions. [2021-05-02 13:02:30,347 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 391 transitions. Word has length 34 [2021-05-02 13:02:30,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:30,347 INFO L480 AbstractCegarLoop]: Abstraction has 312 states and 391 transitions. [2021-05-02 13:02:30,347 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:30,347 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 391 transitions. [2021-05-02 13:02:30,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:02:30,348 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:30,348 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:30,560 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:30,561 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:30,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:30,561 INFO L82 PathProgramCache]: Analyzing trace with hash 1620223476, now seen corresponding path program 7 times [2021-05-02 13:02:30,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:30,561 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142436468] [2021-05-02 13:02:30,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:30,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:30,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:30,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:30,707 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-05-02 13:02:30,707 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:30,707 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2142436468] [2021-05-02 13:02:30,707 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2142436468] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:30,707 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832931788] [2021-05-02 13:02:30,707 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 13:02:30,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:30,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 13:02:30,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:30,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,820 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-05-02 13:02:30,820 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [832931788] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:30,821 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:30,821 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 13:02:30,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830494516] [2021-05-02 13:02:30,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:02:30,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:30,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:02:30,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:02:30,821 INFO L87 Difference]: Start difference. First operand 312 states and 391 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:31,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:31,530 INFO L93 Difference]: Finished difference Result 361 states and 448 transitions. [2021-05-02 13:02:31,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:02:31,533 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 13:02:31,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:31,534 INFO L225 Difference]: With dead ends: 361 [2021-05-02 13:02:31,534 INFO L226 Difference]: Without dead ends: 341 [2021-05-02 13:02:31,534 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 452.8ms TimeCoverageRelationStatistics Valid=104, Invalid=708, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:02:31,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2021-05-02 13:02:31,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 301. [2021-05-02 13:02:31,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 296 states have (on average 1.2668918918918919) internal successors, (375), 296 states have internal predecessors, (375), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:31,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 379 transitions. [2021-05-02 13:02:31,545 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 379 transitions. Word has length 34 [2021-05-02 13:02:31,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:31,545 INFO L480 AbstractCegarLoop]: Abstraction has 301 states and 379 transitions. [2021-05-02 13:02:31,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:31,546 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 379 transitions. [2021-05-02 13:02:31,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:02:31,546 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:31,546 INFO L523 BasicCegarLoop]: trace histogram [12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:31,758 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 13:02:31,758 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:31,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:31,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1329721822, now seen corresponding path program 8 times [2021-05-02 13:02:31,759 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:31,759 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775503133] [2021-05-02 13:02:31,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:31,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:31,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:31,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:31,979 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:02:31,979 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:31,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775503133] [2021-05-02 13:02:31,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775503133] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:31,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135903783] [2021-05-02 13:02:31,979 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 13:02:32,020 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:02:32,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:32,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 13:02:32,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:32,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:32,174 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:02:32,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135903783] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:32,174 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:32,174 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20] total 22 [2021-05-02 13:02:32,174 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508421071] [2021-05-02 13:02:32,174 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:02:32,174 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:32,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:02:32,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=411, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:02:32,175 INFO L87 Difference]: Start difference. First operand 301 states and 379 transitions. Second operand has 22 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 21 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:33,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:33,481 INFO L93 Difference]: Finished difference Result 533 states and 729 transitions. [2021-05-02 13:02:33,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 13:02:33,482 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 21 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 13:02:33,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:33,483 INFO L225 Difference]: With dead ends: 533 [2021-05-02 13:02:33,483 INFO L226 Difference]: Without dead ends: 504 [2021-05-02 13:02:33,483 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 725.2ms TimeCoverageRelationStatistics Valid=146, Invalid=1494, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:02:33,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-05-02 13:02:33,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 316. [2021-05-02 13:02:33,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 311 states have (on average 1.2733118971061093) internal successors, (396), 311 states have internal predecessors, (396), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:33,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 400 transitions. [2021-05-02 13:02:33,496 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 400 transitions. Word has length 34 [2021-05-02 13:02:33,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:33,496 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 400 transitions. [2021-05-02 13:02:33,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 21 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:33,497 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 400 transitions. [2021-05-02 13:02:33,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 13:02:33,497 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:33,497 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:33,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 13:02:33,713 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:33,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:33,713 INFO L82 PathProgramCache]: Analyzing trace with hash -879664127, now seen corresponding path program 6 times [2021-05-02 13:02:33,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:33,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208364500] [2021-05-02 13:02:33,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:33,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:33,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:33,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:33,977 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:33,977 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:33,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208364500] [2021-05-02 13:02:33,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208364500] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:33,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1851189094] [2021-05-02 13:02:33,977 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 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 13:02:34,097 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:02:34,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:34,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 13:02:34,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:34,294 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:02:34,294 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1851189094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:34,294 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:34,294 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9] total 25 [2021-05-02 13:02:34,294 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216595922] [2021-05-02 13:02:34,295 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:02:34,295 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:34,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:02:34,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:02:34,296 INFO L87 Difference]: Start difference. First operand 316 states and 400 transitions. Second operand has 25 states, 25 states have (on average 2.12) internal successors, (53), 24 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 13:02:34,829 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:35,215 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:35,424 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:35,692 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:35,906 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:02:36,223 WARN L205 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:36,419 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:02:36,820 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:02:37,076 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:37,579 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:02:38,146 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:02:40,528 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:40,959 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:41,806 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:42,076 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:42,667 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:42,953 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:43,192 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:43,428 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:43,677 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:44,124 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:44,311 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:44,507 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:44,745 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:44,964 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:45,179 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:45,378 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:02:45,797 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:46,052 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:46,255 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:46,483 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:02:46,718 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:47,159 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:47,638 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:47,879 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:48,131 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:48,404 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:48,632 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:49,098 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:49,392 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:02:49,626 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:49,886 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:50,139 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:02:50,405 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:50,773 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:51,016 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:51,210 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:51,411 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:02:51,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:51,411 INFO L93 Difference]: Finished difference Result 461 states and 613 transitions. [2021-05-02 13:02:51,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-05-02 13:02:51,412 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.12) internal successors, (53), 24 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 35 [2021-05-02 13:02:51,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:51,413 INFO L225 Difference]: With dead ends: 461 [2021-05-02 13:02:51,413 INFO L226 Difference]: Without dead ends: 402 [2021-05-02 13:02:51,415 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5444 ImplicationChecksByTransitivity, 15353.1ms TimeCoverageRelationStatistics Valid=1645, Invalid=15125, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 13:02:51,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2021-05-02 13:02:51,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 331. [2021-05-02 13:02:51,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 326 states have (on average 1.2576687116564418) internal successors, (410), 326 states have internal predecessors, (410), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:51,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 414 transitions. [2021-05-02 13:02:51,428 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 414 transitions. Word has length 35 [2021-05-02 13:02:51,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:51,428 INFO L480 AbstractCegarLoop]: Abstraction has 331 states and 414 transitions. [2021-05-02 13:02:51,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.12) internal successors, (53), 24 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 13:02:51,428 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 414 transitions. [2021-05-02 13:02:51,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 13:02:51,429 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:51,429 INFO L523 BasicCegarLoop]: trace histogram [13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:51,642 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 13:02:51,642 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:51,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:51,643 INFO L82 PathProgramCache]: Analyzing trace with hash -973391377, now seen corresponding path program 9 times [2021-05-02 13:02:51,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:51,643 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417009467] [2021-05-02 13:02:51,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:51,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:51,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:51,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:51,928 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 94 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:02:51,929 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:51,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417009467] [2021-05-02 13:02:51,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417009467] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:51,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140366598] [2021-05-02 13:02:51,929 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:51,962 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:02:51,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:51,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 13:02:51,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:52,112 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-05-02 13:02:52,112 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140366598] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:52,113 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:52,113 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 7] total 25 [2021-05-02 13:02:52,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726854052] [2021-05-02 13:02:52,113 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:02:52,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:52,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:02:52,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=546, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:02:52,113 INFO L87 Difference]: Start difference. First operand 331 states and 414 transitions. Second operand has 25 states, 25 states have (on average 1.72) internal successors, (43), 24 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 13:02:57,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:57,625 INFO L93 Difference]: Finished difference Result 660 states and 885 transitions. [2021-05-02 13:02:57,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-02 13:02:57,626 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 24 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 35 [2021-05-02 13:02:57,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:57,627 INFO L225 Difference]: With dead ends: 660 [2021-05-02 13:02:57,627 INFO L226 Difference]: Without dead ends: 592 [2021-05-02 13:02:57,628 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3420 ImplicationChecksByTransitivity, 3843.6ms TimeCoverageRelationStatistics Valid=856, Invalid=10916, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 13:02:57,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-05-02 13:02:57,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 314. [2021-05-02 13:02:57,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 314 states, 309 states have (on average 1.2653721682847896) internal successors, (391), 309 states have internal predecessors, (391), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:57,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 395 transitions. [2021-05-02 13:02:57,643 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 395 transitions. Word has length 35 [2021-05-02 13:02:57,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:57,643 INFO L480 AbstractCegarLoop]: Abstraction has 314 states and 395 transitions. [2021-05-02 13:02:57,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 24 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 13:02:57,643 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 395 transitions. [2021-05-02 13:02:57,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 13:02:57,644 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:57,644 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:57,858 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 13:02:57,859 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:57,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:57,859 INFO L82 PathProgramCache]: Analyzing trace with hash -1464011024, now seen corresponding path program 14 times [2021-05-02 13:02:57,859 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:57,859 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056706448] [2021-05-02 13:02:57,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:57,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:57,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:57,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:57,948 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:02:57,948 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:57,948 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056706448] [2021-05-02 13:02:57,948 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056706448] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:57,948 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950822178] [2021-05-02 13:02:57,948 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 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 13:02:58,017 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:02:58,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:58,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 13:02:58,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:58,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:58,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:58,073 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:02:58,073 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [950822178] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:58,074 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:58,074 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 8 [2021-05-02 13:02:58,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991791356] [2021-05-02 13:02:58,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:02:58,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:58,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:02:58,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:02:58,075 INFO L87 Difference]: Start difference. First operand 314 states and 395 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:58,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:58,324 INFO L93 Difference]: Finished difference Result 342 states and 436 transitions. [2021-05-02 13:02:58,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:02:58,325 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 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 37 [2021-05-02 13:02:58,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:58,326 INFO L225 Difference]: With dead ends: 342 [2021-05-02 13:02:58,326 INFO L226 Difference]: Without dead ends: 302 [2021-05-02 13:02:58,326 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 164.1ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:02:58,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-05-02 13:02:58,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 298. [2021-05-02 13:02:58,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 293 states have (on average 1.273037542662116) internal successors, (373), 293 states have internal predecessors, (373), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:58,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 377 transitions. [2021-05-02 13:02:58,341 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 377 transitions. Word has length 37 [2021-05-02 13:02:58,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:58,341 INFO L480 AbstractCegarLoop]: Abstraction has 298 states and 377 transitions. [2021-05-02 13:02:58,341 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:58,341 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 377 transitions. [2021-05-02 13:02:58,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 13:02:58,342 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:58,342 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:58,556 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:58,556 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:58,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:58,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1189918786, now seen corresponding path program 10 times [2021-05-02 13:02:58,557 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:58,557 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692851250] [2021-05-02 13:02:58,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:58,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:58,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:58,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:58,777 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-05-02 13:02:58,777 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:58,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692851250] [2021-05-02 13:02:58,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692851250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:58,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409018787] [2021-05-02 13:02:58,777 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:58,818 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:02:58,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:58,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 13:02:58,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:59,018 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 15 proven. 32 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-05-02 13:02:59,018 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409018787] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:59,018 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:59,018 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9] total 25 [2021-05-02 13:02:59,018 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156640500] [2021-05-02 13:02:59,018 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:02:59,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:59,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:02:59,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=547, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:02:59,019 INFO L87 Difference]: Start difference. First operand 298 states and 377 transitions. Second operand has 25 states, 25 states have (on average 1.92) internal successors, (48), 24 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 13:03:00,608 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:00,796 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:01,455 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:01,640 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:03:02,047 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:03:02,412 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:03:05,358 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:03:06,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:03:06,288 INFO L93 Difference]: Finished difference Result 372 states and 471 transitions. [2021-05-02 13:03:06,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-02 13:03:06,288 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 24 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 37 [2021-05-02 13:03:06,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:03:06,289 INFO L225 Difference]: With dead ends: 372 [2021-05-02 13:03:06,289 INFO L226 Difference]: Without dead ends: 311 [2021-05-02 13:03:06,290 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2451 ImplicationChecksByTransitivity, 6173.2ms TimeCoverageRelationStatistics Valid=943, Invalid=7987, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 13:03:06,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2021-05-02 13:03:06,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 245. [2021-05-02 13:03:06,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 240 states have (on average 1.3041666666666667) internal successors, (313), 240 states have internal predecessors, (313), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:06,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 317 transitions. [2021-05-02 13:03:06,302 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 317 transitions. Word has length 37 [2021-05-02 13:03:06,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:03:06,303 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 317 transitions. [2021-05-02 13:03:06,303 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 24 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 13:03:06,303 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 317 transitions. [2021-05-02 13:03:06,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 13:03:06,303 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:03:06,303 INFO L523 BasicCegarLoop]: trace histogram [14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:03:06,524 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-05-02 13:03:06,525 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:03:06,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:03:06,525 INFO L82 PathProgramCache]: Analyzing trace with hash -1239692543, now seen corresponding path program 15 times [2021-05-02 13:03:06,525 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:03:06,525 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364188315] [2021-05-02 13:03:06,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:03:06,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:06,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:03:06,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:06,813 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:03:06,813 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:03:06,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364188315] [2021-05-02 13:03:06,813 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364188315] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:06,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904712426] [2021-05-02 13:03:06,813 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 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 13:03:06,847 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:03:06,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:03:06,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:03:06,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:03:06,978 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-05-02 13:03:06,978 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904712426] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:06,978 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:03:06,978 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 5] total 24 [2021-05-02 13:03:06,978 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126647414] [2021-05-02 13:03:06,978 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:03:06,978 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:03:06,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:03:06,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=497, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:03:06,979 INFO L87 Difference]: Start difference. First operand 245 states and 317 transitions. Second operand has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 23 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 13:03:12,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:03:12,483 INFO L93 Difference]: Finished difference Result 565 states and 757 transitions. [2021-05-02 13:03:12,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2021-05-02 13:03:12,484 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 23 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 37 [2021-05-02 13:03:12,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:03:12,485 INFO L225 Difference]: With dead ends: 565 [2021-05-02 13:03:12,485 INFO L226 Difference]: Without dead ends: 531 [2021-05-02 13:03:12,486 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4449 ImplicationChecksByTransitivity, 3940.0ms TimeCoverageRelationStatistics Valid=975, Invalid=13305, Unknown=0, NotChecked=0, Total=14280 [2021-05-02 13:03:12,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531 states. [2021-05-02 13:03:12,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531 to 272. [2021-05-02 13:03:12,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 267 states have (on average 1.3108614232209739) internal successors, (350), 267 states have internal predecessors, (350), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:12,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 354 transitions. [2021-05-02 13:03:12,501 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 354 transitions. Word has length 37 [2021-05-02 13:03:12,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:03:12,501 INFO L480 AbstractCegarLoop]: Abstraction has 272 states and 354 transitions. [2021-05-02 13:03:12,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 23 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 13:03:12,501 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 354 transitions. [2021-05-02 13:03:12,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:03:12,502 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:03:12,502 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:03:12,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 13:03:12,713 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:03:12,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:03:12,713 INFO L82 PathProgramCache]: Analyzing trace with hash 2053708003, now seen corresponding path program 7 times [2021-05-02 13:03:12,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:03:12,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [742677607] [2021-05-02 13:03:12,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:03:12,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:12,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:03:12,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:13,001 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:03:13,001 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:03:13,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [742677607] [2021-05-02 13:03:13,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [742677607] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:13,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562170014] [2021-05-02 13:03:13,002 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 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 13:03:13,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:13,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 13:03:13,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:03:13,323 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-05-02 13:03:13,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562170014] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:13,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:03:13,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10] total 28 [2021-05-02 13:03:13,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758417427] [2021-05-02 13:03:13,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:03:13,324 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:03:13,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:03:13,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:03:13,324 INFO L87 Difference]: Start difference. First operand 272 states and 354 transitions. Second operand has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 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 13:03:14,302 WARN L205 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:14,575 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:03:15,012 WARN L205 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:15,659 WARN L205 SmtUtils]: Spent 388.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:16,223 WARN L205 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:16,745 WARN L205 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:17,121 WARN L205 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:17,517 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:17,853 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:18,511 WARN L205 SmtUtils]: Spent 263.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:19,015 WARN L205 SmtUtils]: Spent 227.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:19,497 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:03:19,832 WARN L205 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:03:20,356 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:03:20,877 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:03:21,551 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:03:24,859 WARN L205 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:25,177 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:03:25,832 WARN L205 SmtUtils]: Spent 361.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:26,184 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:26,650 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:03:27,151 WARN L205 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:27,761 WARN L205 SmtUtils]: Spent 436.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:28,266 WARN L205 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:29,094 WARN L205 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:03:29,514 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:30,131 WARN L205 SmtUtils]: Spent 372.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:30,694 WARN L205 SmtUtils]: Spent 387.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:30,902 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:03:31,540 WARN L205 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:32,082 WARN L205 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:32,733 WARN L205 SmtUtils]: Spent 373.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:33,103 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:33,556 WARN L205 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:34,064 WARN L205 SmtUtils]: Spent 357.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:34,316 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:03:34,724 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:35,204 WARN L205 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:35,676 WARN L205 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:03:36,095 WARN L205 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:36,567 WARN L205 SmtUtils]: Spent 300.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:37,165 WARN L205 SmtUtils]: Spent 404.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:37,715 WARN L205 SmtUtils]: Spent 337.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:38,056 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:03:38,583 WARN L205 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:39,342 WARN L205 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:39,777 WARN L205 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:40,248 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:40,745 WARN L205 SmtUtils]: Spent 286.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:03:41,187 WARN L205 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:41,700 WARN L205 SmtUtils]: Spent 294.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:42,189 WARN L205 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:42,924 WARN L205 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:43,656 WARN L205 SmtUtils]: Spent 397.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:44,111 WARN L205 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:44,819 WARN L205 SmtUtils]: Spent 420.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:45,342 WARN L205 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:46,053 WARN L205 SmtUtils]: Spent 479.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:03:46,624 WARN L205 SmtUtils]: Spent 309.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:47,199 WARN L205 SmtUtils]: Spent 368.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:47,905 WARN L205 SmtUtils]: Spent 336.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:48,592 WARN L205 SmtUtils]: Spent 366.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:49,301 WARN L205 SmtUtils]: Spent 292.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:50,201 WARN L205 SmtUtils]: Spent 734.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:50,538 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:51,007 WARN L205 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:51,574 WARN L205 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:03:52,109 WARN L205 SmtUtils]: Spent 312.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:52,683 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:53,256 WARN L205 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:53,881 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:54,507 WARN L205 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:55,117 WARN L205 SmtUtils]: Spent 374.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:55,618 WARN L205 SmtUtils]: Spent 328.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:03:55,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:03:55,619 INFO L93 Difference]: Finished difference Result 445 states and 603 transitions. [2021-05-02 13:03:55,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2021-05-02 13:03:55,619 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 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 38 [2021-05-02 13:03:55,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:03:55,620 INFO L225 Difference]: With dead ends: 445 [2021-05-02 13:03:55,620 INFO L226 Difference]: Without dead ends: 404 [2021-05-02 13:03:55,621 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8506 ImplicationChecksByTransitivity, 39433.2ms TimeCoverageRelationStatistics Valid=2256, Invalid=22866, Unknown=0, NotChecked=0, Total=25122 [2021-05-02 13:03:55,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2021-05-02 13:03:55,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 296. [2021-05-02 13:03:55,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 291 states have (on average 1.2920962199312716) internal successors, (376), 291 states have internal predecessors, (376), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:55,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 380 transitions. [2021-05-02 13:03:55,637 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 380 transitions. Word has length 38 [2021-05-02 13:03:55,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:03:55,637 INFO L480 AbstractCegarLoop]: Abstraction has 296 states and 380 transitions. [2021-05-02 13:03:55,637 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 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 13:03:55,637 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 380 transitions. [2021-05-02 13:03:55,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:03:55,637 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:03:55,637 INFO L523 BasicCegarLoop]: trace histogram [15, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:03:55,840 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:03:55,841 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:03:55,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:03:55,841 INFO L82 PathProgramCache]: Analyzing trace with hash 73311668, now seen corresponding path program 11 times [2021-05-02 13:03:55,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:03:55,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172508469] [2021-05-02 13:03:55,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:03:55,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:56,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:03:56,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:56,247 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 123 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:03:56,248 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:03:56,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172508469] [2021-05-02 13:03:56,248 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172508469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:56,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87661116] [2021-05-02 13:03:56,248 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 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 13:03:57,234 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-05-02 13:03:57,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:03:57,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 13:03:57,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:03:57,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:57,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:57,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:57,547 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 129 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:03:57,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87661116] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:57,547 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:03:57,547 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 24] total 26 [2021-05-02 13:03:57,548 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040689394] [2021-05-02 13:03:57,548 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:03:57,548 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:03:57,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:03:57,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=590, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:03:57,548 INFO L87 Difference]: Start difference. First operand 296 states and 380 transitions. Second operand has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:00,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:00,499 INFO L93 Difference]: Finished difference Result 624 states and 859 transitions. [2021-05-02 13:04:00,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 13:04:00,500 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 13:04:00,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:00,501 INFO L225 Difference]: With dead ends: 624 [2021-05-02 13:04:00,501 INFO L226 Difference]: Without dead ends: 581 [2021-05-02 13:04:00,502 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 1281.0ms TimeCoverageRelationStatistics Valid=167, Invalid=2089, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:04:00,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 581 states. [2021-05-02 13:04:00,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 581 to 328. [2021-05-02 13:04:00,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 323 states have (on average 1.284829721362229) internal successors, (415), 323 states have internal predecessors, (415), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:00,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 419 transitions. [2021-05-02 13:04:00,520 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 419 transitions. Word has length 38 [2021-05-02 13:04:00,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:00,520 INFO L480 AbstractCegarLoop]: Abstraction has 328 states and 419 transitions. [2021-05-02 13:04:00,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:00,520 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 419 transitions. [2021-05-02 13:04:00,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 13:04:00,521 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:00,521 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:00,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-05-02 13:04:00,724 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:00,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:00,724 INFO L82 PathProgramCache]: Analyzing trace with hash -770012495, now seen corresponding path program 16 times [2021-05-02 13:04:00,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:00,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864384521] [2021-05-02 13:04:00,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:00,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:00,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:00,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:00,946 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:04:00,947 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:00,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864384521] [2021-05-02 13:04:00,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864384521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:00,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1679010565] [2021-05-02 13:04:00,947 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 13:04:01,000 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:04:01,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:01,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 13:04:01,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:01,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:01,201 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 22 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 13:04:01,202 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1679010565] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:01,202 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:01,202 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 19 [2021-05-02 13:04:01,202 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465363594] [2021-05-02 13:04:01,202 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:04:01,202 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:01,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:04:01,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:04:01,203 INFO L87 Difference]: Start difference. First operand 328 states and 419 transitions. Second operand has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 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 13:04:03,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:03,240 INFO L93 Difference]: Finished difference Result 426 states and 554 transitions. [2021-05-02 13:04:03,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:04:03,241 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 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 39 [2021-05-02 13:04:03,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:03,242 INFO L225 Difference]: With dead ends: 426 [2021-05-02 13:04:03,242 INFO L226 Difference]: Without dead ends: 410 [2021-05-02 13:04:03,243 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 1416.7ms TimeCoverageRelationStatistics Valid=380, Invalid=1426, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:04:03,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2021-05-02 13:04:03,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 390. [2021-05-02 13:04:03,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 385 states have (on average 1.2805194805194806) internal successors, (493), 385 states have internal predecessors, (493), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:03,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 497 transitions. [2021-05-02 13:04:03,279 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 497 transitions. Word has length 39 [2021-05-02 13:04:03,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:03,279 INFO L480 AbstractCegarLoop]: Abstraction has 390 states and 497 transitions. [2021-05-02 13:04:03,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 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 13:04:03,279 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 497 transitions. [2021-05-02 13:04:03,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 13:04:03,280 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:03,280 INFO L523 BasicCegarLoop]: trace histogram [16, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:03,495 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:03,495 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:03,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:03,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1672011007, now seen corresponding path program 12 times [2021-05-02 13:04:03,495 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:03,496 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070132278] [2021-05-02 13:04:03,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:03,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:03,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:03,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:03,988 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 139 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:04:03,988 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:03,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070132278] [2021-05-02 13:04:03,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070132278] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:03,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1756632390] [2021-05-02 13:04:03,988 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:04,091 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 13:04:04,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:04,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 13:04:04,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:04,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:04,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:04,413 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2021-05-02 13:04:04,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1756632390] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:04,413 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:04,413 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 8] total 29 [2021-05-02 13:04:04,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072804743] [2021-05-02 13:04:04,413 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 13:04:04,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:04,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 13:04:04,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=752, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:04:04,414 INFO L87 Difference]: Start difference. First operand 390 states and 497 transitions. Second operand has 29 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 28 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 13:04:10,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:10,798 INFO L93 Difference]: Finished difference Result 815 states and 1135 transitions. [2021-05-02 13:04:10,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-02 13:04:10,799 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 28 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 39 [2021-05-02 13:04:10,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:10,801 INFO L225 Difference]: With dead ends: 815 [2021-05-02 13:04:10,801 INFO L226 Difference]: Without dead ends: 757 [2021-05-02 13:04:10,801 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1802 ImplicationChecksByTransitivity, 4114.5ms TimeCoverageRelationStatistics Valid=433, Invalid=7577, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 13:04:10,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 757 states. [2021-05-02 13:04:10,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 757 to 408. [2021-05-02 13:04:10,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 408 states, 403 states have (on average 1.28287841191067) internal successors, (517), 403 states have internal predecessors, (517), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:10,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 521 transitions. [2021-05-02 13:04:10,823 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 521 transitions. Word has length 39 [2021-05-02 13:04:10,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:10,823 INFO L480 AbstractCegarLoop]: Abstraction has 408 states and 521 transitions. [2021-05-02 13:04:10,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 28 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 13:04:10,823 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 521 transitions. [2021-05-02 13:04:10,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:04:10,824 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:10,824 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:11,036 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 13:04:11,037 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:11,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:11,037 INFO L82 PathProgramCache]: Analyzing trace with hash 509212162, now seen corresponding path program 13 times [2021-05-02 13:04:11,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:11,037 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493858625] [2021-05-02 13:04:11,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:11,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:11,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:11,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:11,330 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-05-02 13:04:11,330 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:11,330 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493858625] [2021-05-02 13:04:11,330 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493858625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:11,330 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978783143] [2021-05-02 13:04:11,330 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:11,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:11,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:04:11,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:11,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:11,522 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-05-02 13:04:11,522 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978783143] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:11,522 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:11,522 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 13:04:11,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145142129] [2021-05-02 13:04:11,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:04:11,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:11,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:04:11,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=268, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:04:11,523 INFO L87 Difference]: Start difference. First operand 408 states and 521 transitions. Second operand has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:13,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:13,252 INFO L93 Difference]: Finished difference Result 563 states and 705 transitions. [2021-05-02 13:04:13,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:04:13,253 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 13:04:13,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:13,254 INFO L225 Difference]: With dead ends: 563 [2021-05-02 13:04:13,254 INFO L226 Difference]: Without dead ends: 543 [2021-05-02 13:04:13,255 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 1072.0ms TimeCoverageRelationStatistics Valid=172, Invalid=1468, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:04:13,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2021-05-02 13:04:13,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 408. [2021-05-02 13:04:13,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 408 states, 403 states have (on average 1.2803970223325063) internal successors, (516), 403 states have internal predecessors, (516), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:13,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 520 transitions. [2021-05-02 13:04:13,284 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 520 transitions. Word has length 40 [2021-05-02 13:04:13,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:13,284 INFO L480 AbstractCegarLoop]: Abstraction has 408 states and 520 transitions. [2021-05-02 13:04:13,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:13,284 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 520 transitions. [2021-05-02 13:04:13,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:04:13,284 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:13,285 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:13,494 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:13,494 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:13,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:13,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1851265310, now seen corresponding path program 14 times [2021-05-02 13:04:13,495 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:13,495 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898591628] [2021-05-02 13:04:13,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:13,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:13,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:13,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:13,877 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-05-02 13:04:13,877 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:13,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898591628] [2021-05-02 13:04:13,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898591628] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:13,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735431656] [2021-05-02 13:04:13,877 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 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 13:04:13,919 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:04:13,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:13,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 13:04:13,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:14,299 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 18 proven. 44 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-05-02 13:04:14,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1735431656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:14,299 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:14,299 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10] total 28 [2021-05-02 13:04:14,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118517446] [2021-05-02 13:04:14,300 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:04:14,300 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:14,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:04:14,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=696, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:04:14,300 INFO L87 Difference]: Start difference. First operand 408 states and 520 transitions. Second operand has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:15,011 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:04:15,475 WARN L205 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:15,781 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:04:16,234 WARN L205 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:04:16,718 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:17,017 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:04:17,359 WARN L205 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:04:17,988 WARN L205 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:04:18,398 WARN L205 SmtUtils]: Spent 239.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:04:18,685 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:04:18,998 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:04:19,347 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:04:19,752 WARN L205 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:04:20,124 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:04:20,518 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:04:20,757 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:21,080 WARN L205 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:04:21,485 WARN L205 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:04:21,944 WARN L205 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:04:22,293 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:04:22,751 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:23,119 WARN L205 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:04:23,503 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:04:24,084 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:04:24,481 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:04:24,887 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:04:25,567 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:04:25,960 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:04:26,777 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:04:30,186 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:04:30,773 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:04:31,910 WARN L205 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:32,371 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:04:33,184 WARN L205 SmtUtils]: Spent 338.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:34,364 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:34,919 WARN L205 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:04:35,747 WARN L205 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:36,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:36,578 INFO L93 Difference]: Finished difference Result 576 states and 728 transitions. [2021-05-02 13:04:36,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-05-02 13:04:36,580 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 13:04:36,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:36,581 INFO L225 Difference]: With dead ends: 576 [2021-05-02 13:04:36,581 INFO L226 Difference]: Without dead ends: 525 [2021-05-02 13:04:36,582 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4736 ImplicationChecksByTransitivity, 18979.2ms TimeCoverageRelationStatistics Valid=1487, Invalid=14013, Unknown=0, NotChecked=0, Total=15500 [2021-05-02 13:04:36,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 525 states. [2021-05-02 13:04:36,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 525 to 383. [2021-05-02 13:04:36,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 383 states, 378 states have (on average 1.2777777777777777) internal successors, (483), 378 states have internal predecessors, (483), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:36,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 487 transitions. [2021-05-02 13:04:36,603 INFO L78 Accepts]: Start accepts. Automaton has 383 states and 487 transitions. Word has length 40 [2021-05-02 13:04:36,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:36,603 INFO L480 AbstractCegarLoop]: Abstraction has 383 states and 487 transitions. [2021-05-02 13:04:36,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:36,603 INFO L276 IsEmpty]: Start isEmpty. Operand 383 states and 487 transitions. [2021-05-02 13:04:36,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 13:04:36,604 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:36,604 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:36,813 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-02 13:04:36,813 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:36,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:36,815 INFO L82 PathProgramCache]: Analyzing trace with hash -134128447, now seen corresponding path program 8 times [2021-05-02 13:04:36,815 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:36,815 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508193658] [2021-05-02 13:04:36,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:36,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:37,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:37,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:37,327 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:37,327 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:37,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508193658] [2021-05-02 13:04:37,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508193658] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:37,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1320882413] [2021-05-02 13:04:37,327 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 13:04:37,378 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:04:37,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:37,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 13:04:37,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:37,896 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-05-02 13:04:37,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1320882413] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:37,896 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:37,896 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 11] total 31 [2021-05-02 13:04:37,896 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405091768] [2021-05-02 13:04:37,897 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:04:37,897 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:37,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:04:37,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:04:37,897 INFO L87 Difference]: Start difference. First operand 383 states and 487 transitions. Second operand has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 30 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 13:04:38,792 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:04:39,765 WARN L205 SmtUtils]: Spent 343.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:04:40,238 WARN L205 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:04:41,185 WARN L205 SmtUtils]: Spent 499.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:04:42,147 WARN L205 SmtUtils]: Spent 508.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:04:42,743 WARN L205 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:43,882 WARN L205 SmtUtils]: Spent 779.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:04:45,047 WARN L205 SmtUtils]: Spent 716.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:04:46,582 WARN L205 SmtUtils]: Spent 673.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:04:48,321 WARN L205 SmtUtils]: Spent 761.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:04:48,898 WARN L205 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:04:50,589 WARN L205 SmtUtils]: Spent 618.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:04:52,244 WARN L205 SmtUtils]: Spent 792.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:04:53,450 WARN L205 SmtUtils]: Spent 527.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:04:53,990 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:04:54,841 WARN L205 SmtUtils]: Spent 535.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:04:56,095 WARN L205 SmtUtils]: Spent 785.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:04:57,439 WARN L205 SmtUtils]: Spent 672.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:04:57,830 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:58,373 WARN L205 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:04:59,230 WARN L205 SmtUtils]: Spent 408.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:05:00,563 WARN L205 SmtUtils]: Spent 899.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:05:01,175 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:05:01,782 WARN L205 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:05:02,845 WARN L205 SmtUtils]: Spent 482.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:05:04,349 WARN L205 SmtUtils]: Spent 850.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:05:04,723 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:05:05,150 WARN L205 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:05:05,818 WARN L205 SmtUtils]: Spent 448.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:05:06,544 WARN L205 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:05:06,897 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:05:07,137 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:05:07,485 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:05:07,931 WARN L205 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:05:08,487 WARN L205 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:05:08,784 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:05:09,315 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:05:09,677 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:05:09,946 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:05:10,904 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 13:05:11,202 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:05:11,475 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:05:12,343 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:05:12,628 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:05:14,089 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:05:14,335 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:05:15,196 WARN L205 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:05:16,400 WARN L205 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:05:18,247 WARN L205 SmtUtils]: Spent 602.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:05:19,490 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:05:21,703 WARN L205 SmtUtils]: Spent 768.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:22,168 WARN L205 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:05:24,151 WARN L205 SmtUtils]: Spent 749.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:24,934 WARN L205 SmtUtils]: Spent 386.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:05:26,316 WARN L205 SmtUtils]: Spent 572.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:05:28,199 WARN L205 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:30,547 WARN L205 SmtUtils]: Spent 880.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:31,841 WARN L205 SmtUtils]: Spent 853.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:32,810 WARN L205 SmtUtils]: Spent 530.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:05:33,058 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 13:05:33,629 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:05:34,419 WARN L205 SmtUtils]: Spent 348.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:05:35,874 WARN L205 SmtUtils]: Spent 968.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:37,613 WARN L205 SmtUtils]: Spent 1.08 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:39,289 WARN L205 SmtUtils]: Spent 888.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:05:41,821 WARN L205 SmtUtils]: Spent 1.78 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:43,196 WARN L205 SmtUtils]: Spent 706.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:43,609 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:05:43,960 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 13:05:45,527 WARN L205 SmtUtils]: Spent 727.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:47,052 WARN L205 SmtUtils]: Spent 954.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:49,052 WARN L205 SmtUtils]: Spent 1.24 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:50,468 WARN L205 SmtUtils]: Spent 675.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:52,113 WARN L205 SmtUtils]: Spent 952.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:54,068 WARN L205 SmtUtils]: Spent 1.12 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:54,812 WARN L205 SmtUtils]: Spent 418.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:05:57,159 WARN L205 SmtUtils]: Spent 1.04 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:59,117 WARN L205 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:01,119 WARN L205 SmtUtils]: Spent 1.09 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:03,002 WARN L205 SmtUtils]: Spent 709.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:06:04,637 WARN L205 SmtUtils]: Spent 830.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:06,237 WARN L205 SmtUtils]: Spent 891.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:08,440 WARN L205 SmtUtils]: Spent 1.11 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:10,323 WARN L205 SmtUtils]: Spent 792.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:11,003 WARN L205 SmtUtils]: Spent 303.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:06:12,535 WARN L205 SmtUtils]: Spent 960.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:14,672 WARN L205 SmtUtils]: Spent 1.28 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:16,534 WARN L205 SmtUtils]: Spent 1.12 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:18,995 WARN L205 SmtUtils]: Spent 1.40 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:20,492 WARN L205 SmtUtils]: Spent 849.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:06:22,512 WARN L205 SmtUtils]: Spent 1.37 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:06:24,348 WARN L205 SmtUtils]: Spent 1.17 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:26,357 WARN L205 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:06:28,312 WARN L205 SmtUtils]: Spent 1.14 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:30,205 WARN L205 SmtUtils]: Spent 990.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:31,373 WARN L205 SmtUtils]: Spent 732.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:06:33,854 WARN L205 SmtUtils]: Spent 1.44 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:06:35,765 WARN L205 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:36,062 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 13:06:38,741 WARN L205 SmtUtils]: Spent 1.16 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:40,972 WARN L205 SmtUtils]: Spent 948.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:42,561 WARN L205 SmtUtils]: Spent 823.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:06:44,707 WARN L205 SmtUtils]: Spent 962.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:06:46,471 WARN L205 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:48,679 WARN L205 SmtUtils]: Spent 1.16 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:50,723 WARN L205 SmtUtils]: Spent 1.09 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:53,414 WARN L205 SmtUtils]: Spent 1.45 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:53,789 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:06:55,947 WARN L205 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:06:58,625 WARN L205 SmtUtils]: Spent 1.21 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:07:01,102 WARN L205 SmtUtils]: Spent 863.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:07:03,265 WARN L205 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:05,780 WARN L205 SmtUtils]: Spent 1.45 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:07,899 WARN L205 SmtUtils]: Spent 1.29 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:07:09,526 WARN L205 SmtUtils]: Spent 771.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:10,136 WARN L205 SmtUtils]: Spent 296.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:07:12,719 WARN L205 SmtUtils]: Spent 1.47 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:07:15,110 WARN L205 SmtUtils]: Spent 1.37 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:07:17,398 WARN L205 SmtUtils]: Spent 1.17 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:18,895 WARN L205 SmtUtils]: Spent 769.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:20,124 WARN L205 SmtUtils]: Spent 693.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:07:23,217 WARN L205 SmtUtils]: Spent 1.70 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:25,904 WARN L205 SmtUtils]: Spent 1.68 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:27,373 WARN L205 SmtUtils]: Spent 867.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:07:30,321 WARN L205 SmtUtils]: Spent 1.35 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:32,353 WARN L205 SmtUtils]: Spent 1.27 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:34,334 WARN L205 SmtUtils]: Spent 971.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:07:36,860 WARN L205 SmtUtils]: Spent 1.14 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:07:39,658 WARN L205 SmtUtils]: Spent 1.04 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:42,435 WARN L205 SmtUtils]: Spent 1.87 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:44,984 WARN L205 SmtUtils]: Spent 1.24 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:47,637 WARN L205 SmtUtils]: Spent 1.70 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:07:50,014 WARN L205 SmtUtils]: Spent 1.32 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:07:50,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:50,067 INFO L93 Difference]: Finished difference Result 576 states and 762 transitions. [2021-05-02 13:07:50,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 175 states. [2021-05-02 13:07:50,071 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 30 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 41 [2021-05-02 13:07:50,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:50,072 INFO L225 Difference]: With dead ends: 576 [2021-05-02 13:07:50,072 INFO L226 Difference]: Without dead ends: 554 [2021-05-02 13:07:50,074 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14746 ImplicationChecksByTransitivity, 175667.4ms TimeCoverageRelationStatistics Valid=3238, Invalid=37768, Unknown=0, NotChecked=0, Total=41006 [2021-05-02 13:07:50,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2021-05-02 13:07:50,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 397. [2021-05-02 13:07:50,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 397 states, 392 states have (on average 1.2653061224489797) internal successors, (496), 392 states have internal predecessors, (496), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:50,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 500 transitions. [2021-05-02 13:07:50,097 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 500 transitions. Word has length 41 [2021-05-02 13:07:50,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:50,097 INFO L480 AbstractCegarLoop]: Abstraction has 397 states and 500 transitions. [2021-05-02 13:07:50,098 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 30 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 13:07:50,098 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 500 transitions. [2021-05-02 13:07:50,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 13:07:50,098 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:50,098 INFO L523 BasicCegarLoop]: trace histogram [17, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:50,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 13:07:50,313 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:50,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:50,313 INFO L82 PathProgramCache]: Analyzing trace with hash -1974864049, now seen corresponding path program 17 times [2021-05-02 13:07:50,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:50,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027608531] [2021-05-02 13:07:50,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:50,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:51,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:51,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:51,663 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:07:51,664 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:51,664 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027608531] [2021-05-02 13:07:51,664 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027608531] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:51,664 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978976740] [2021-05-02 13:07:51,664 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 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 13:07:53,079 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 13:07:53,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:53,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 13:07:53,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:53,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:53,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:53,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:53,865 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:07:53,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978976740] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:53,865 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:53,865 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 26] total 28 [2021-05-02 13:07:53,865 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724171101] [2021-05-02 13:07:53,865 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:07:53,865 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:53,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:07:53,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:07:53,866 INFO L87 Difference]: Start difference. First operand 397 states and 500 transitions. Second operand has 28 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 27 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 13:08:05,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:08:05,495 INFO L93 Difference]: Finished difference Result 835 states and 1145 transitions. [2021-05-02 13:08:05,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:08:05,499 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 27 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 41 [2021-05-02 13:08:05,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:08:05,502 INFO L225 Difference]: With dead ends: 835 [2021-05-02 13:08:05,502 INFO L226 Difference]: Without dead ends: 783 [2021-05-02 13:08:05,502 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 4040.2ms TimeCoverageRelationStatistics Valid=182, Invalid=2470, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:08:05,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 783 states. [2021-05-02 13:08:05,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 783 to 415. [2021-05-02 13:08:05,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 410 states have (on average 1.273170731707317) internal successors, (522), 410 states have internal predecessors, (522), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:08:05,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 526 transitions. [2021-05-02 13:08:05,527 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 526 transitions. Word has length 41 [2021-05-02 13:08:05,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:08:05,528 INFO L480 AbstractCegarLoop]: Abstraction has 415 states and 526 transitions. [2021-05-02 13:08:05,528 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 27 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 13:08:05,528 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 526 transitions. [2021-05-02 13:08:05,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:08:05,528 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:08:05,529 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:08:05,729 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,46 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:08:05,729 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:08:05,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:08:05,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1741037917, now seen corresponding path program 18 times [2021-05-02 13:08:05,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:08:05,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677802138] [2021-05-02 13:08:05,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:08:05,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:06,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:08:06,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:06,060 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 13:08:06,061 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:08:06,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677802138] [2021-05-02 13:08:06,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [677802138] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:08:06,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173443472] [2021-05-02 13:08:06,061 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:08:06,404 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:08:06,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:08:06,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:08:06,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:08:06,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:08:06,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:08:06,802 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 13:08:06,802 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173443472] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:08:06,802 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:08:06,803 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 9 [2021-05-02 13:08:06,803 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140096184] [2021-05-02 13:08:06,803 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:08:06,803 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:08:06,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:08:06,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:08:06,803 INFO L87 Difference]: Start difference. First operand 415 states and 526 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:08:08,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:08:08,053 INFO L93 Difference]: Finished difference Result 441 states and 557 transitions. [2021-05-02 13:08:08,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:08:08,056 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 13:08:08,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:08:08,058 INFO L225 Difference]: With dead ends: 441 [2021-05-02 13:08:08,058 INFO L226 Difference]: Without dead ends: 405 [2021-05-02 13:08:08,058 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 760.0ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:08:08,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2021-05-02 13:08:08,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 395. [2021-05-02 13:08:08,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 390 states have (on average 1.2820512820512822) internal successors, (500), 390 states have internal predecessors, (500), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:08:08,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 504 transitions. [2021-05-02 13:08:08,081 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 504 transitions. Word has length 42 [2021-05-02 13:08:08,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:08:08,081 INFO L480 AbstractCegarLoop]: Abstraction has 395 states and 504 transitions. [2021-05-02 13:08:08,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:08:08,081 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 504 transitions. [2021-05-02 13:08:08,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:08:08,081 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:08:08,082 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:08:08,291 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2021-05-02 13:08:08,292 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:08:08,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:08:08,292 INFO L82 PathProgramCache]: Analyzing trace with hash -2141964876, now seen corresponding path program 15 times [2021-05-02 13:08:08,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:08:08,292 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781470411] [2021-05-02 13:08:08,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:08:08,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:09,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:08:09,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:09,151 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 13:08:09,151 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:08:09,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781470411] [2021-05-02 13:08:09,151 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [781470411] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:08:09,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322057993] [2021-05-02 13:08:09,151 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 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 13:08:09,646 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 13:08:09,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:08:09,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 13:08:09,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:08:10,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:08:10,149 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 13:08:10,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322057993] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:08:10,149 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:08:10,149 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 13:08:10,149 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006473006] [2021-05-02 13:08:10,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:08:10,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:08:10,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:08:10,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=302, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:08:10,150 INFO L87 Difference]: Start difference. First operand 395 states and 504 transitions. Second operand has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:08:15,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:08:15,607 INFO L93 Difference]: Finished difference Result 576 states and 719 transitions. [2021-05-02 13:08:15,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:08:15,611 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 13:08:15,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:08:15,612 INFO L225 Difference]: With dead ends: 576 [2021-05-02 13:08:15,612 INFO L226 Difference]: Without dead ends: 555 [2021-05-02 13:08:15,613 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 3196.2ms TimeCoverageRelationStatistics Valid=178, Invalid=1628, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:08:15,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2021-05-02 13:08:15,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 395. [2021-05-02 13:08:15,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 390 states have (on average 1.2794871794871794) internal successors, (499), 390 states have internal predecessors, (499), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:08:15,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 503 transitions. [2021-05-02 13:08:15,635 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 503 transitions. Word has length 42 [2021-05-02 13:08:15,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:08:15,635 INFO L480 AbstractCegarLoop]: Abstraction has 395 states and 503 transitions. [2021-05-02 13:08:15,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:08:15,635 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 503 transitions. [2021-05-02 13:08:15,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:08:15,636 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:08:15,636 INFO L523 BasicCegarLoop]: trace histogram [18, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:08:15,840 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:08:15,840 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:08:15,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:08:15,841 INFO L82 PathProgramCache]: Analyzing trace with hash -2008589598, now seen corresponding path program 19 times [2021-05-02 13:08:15,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:08:15,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32029537] [2021-05-02 13:08:15,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:08:15,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:17,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:08:17,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:17,343 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 0 proven. 174 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:08:17,344 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:08:17,344 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32029537] [2021-05-02 13:08:17,344 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [32029537] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:08:17,344 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594384317] [2021-05-02 13:08:17,344 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 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 13:08:17,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:17,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 13:08:17,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:08:17,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:08:17,939 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 0 proven. 174 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:08:17,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1594384317] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:08:17,939 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:08:17,939 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 13:08:17,939 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854027052] [2021-05-02 13:08:17,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:08:17,940 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:08:17,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:08:17,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=598, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:08:17,940 INFO L87 Difference]: Start difference. First operand 395 states and 503 transitions. Second operand has 26 states, 26 states have (on average 1.4615384615384615) internal successors, (38), 25 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 13:08:30,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:08:30,207 INFO L93 Difference]: Finished difference Result 837 states and 1151 transitions. [2021-05-02 13:08:30,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:08:30,210 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.4615384615384615) internal successors, (38), 25 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 42 [2021-05-02 13:08:30,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:08:30,212 INFO L225 Difference]: With dead ends: 837 [2021-05-02 13:08:30,213 INFO L226 Difference]: Without dead ends: 785 [2021-05-02 13:08:30,213 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 4132.8ms TimeCoverageRelationStatistics Valid=170, Invalid=2380, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:08:30,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 785 states. [2021-05-02 13:08:30,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 785 to 413. [2021-05-02 13:08:30,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 408 states have (on average 1.286764705882353) internal successors, (525), 408 states have internal predecessors, (525), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:08:30,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 529 transitions. [2021-05-02 13:08:30,237 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 529 transitions. Word has length 42 [2021-05-02 13:08:30,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:08:30,237 INFO L480 AbstractCegarLoop]: Abstraction has 413 states and 529 transitions. [2021-05-02 13:08:30,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.4615384615384615) internal successors, (38), 25 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 13:08:30,237 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 529 transitions. [2021-05-02 13:08:30,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:08:30,238 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:08:30,238 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:08:30,438 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,49 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:08:30,439 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:08:30,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:08:30,439 INFO L82 PathProgramCache]: Analyzing trace with hash 565184830, now seen corresponding path program 16 times [2021-05-02 13:08:30,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:08:30,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [938099708] [2021-05-02 13:08:30,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:08:30,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:31,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:08:31,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:31,741 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-05-02 13:08:31,742 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:08:31,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [938099708] [2021-05-02 13:08:31,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [938099708] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:08:31,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276561757] [2021-05-02 13:08:31,742 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:08:31,790 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:08:31,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:08:31,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 13:08:31,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:08:33,344 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 21 proven. 58 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-05-02 13:08:33,344 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276561757] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:08:33,344 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:08:33,344 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 11] total 31 [2021-05-02 13:08:33,345 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097347658] [2021-05-02 13:08:33,345 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:08:33,345 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:08:33,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:08:33,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=863, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:08:33,345 INFO L87 Difference]: Start difference. First operand 413 states and 529 transitions. Second operand has 31 states, 31 states have (on average 1.8064516129032258) internal successors, (56), 30 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 13:08:34,145 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-02 13:08:34,528 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-02 13:08:34,986 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 13:08:35,793 WARN L205 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:08:37,026 WARN L205 SmtUtils]: Spent 625.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:08:39,814 WARN L205 SmtUtils]: Spent 1.53 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:08:41,340 WARN L205 SmtUtils]: Spent 659.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:08:43,264 WARN L205 SmtUtils]: Spent 1.23 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:08:45,086 WARN L205 SmtUtils]: Spent 1.15 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:08:46,933 WARN L205 SmtUtils]: Spent 970.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:08:49,750 WARN L205 SmtUtils]: Spent 1.20 s on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:08:51,755 WARN L205 SmtUtils]: Spent 1.17 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:08:53,500 WARN L205 SmtUtils]: Spent 933.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:08:55,712 WARN L205 SmtUtils]: Spent 1.08 s on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:08:57,513 WARN L205 SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:08:59,142 WARN L205 SmtUtils]: Spent 831.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:09:01,274 WARN L205 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:09:03,724 WARN L205 SmtUtils]: Spent 1.78 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:09:05,171 WARN L205 SmtUtils]: Spent 694.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:09:06,454 WARN L205 SmtUtils]: Spent 650.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:09:08,058 WARN L205 SmtUtils]: Spent 865.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:09:09,803 WARN L205 SmtUtils]: Spent 922.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:09:11,997 WARN L205 SmtUtils]: Spent 1.45 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:09:14,203 WARN L205 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:09:15,040 WARN L205 SmtUtils]: Spent 351.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:09:16,390 WARN L205 SmtUtils]: Spent 837.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:09:18,066 WARN L205 SmtUtils]: Spent 933.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:09:20,150 WARN L205 SmtUtils]: Spent 1.04 s on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:09:20,926 WARN L205 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:09:21,774 WARN L205 SmtUtils]: Spent 409.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:09:23,314 WARN L205 SmtUtils]: Spent 870.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:09:25,078 WARN L205 SmtUtils]: Spent 964.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:09:26,475 WARN L205 SmtUtils]: Spent 650.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:09:26,836 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 13:09:27,477 WARN L205 SmtUtils]: Spent 303.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:09:28,384 WARN L205 SmtUtils]: Spent 425.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:09:29,793 WARN L205 SmtUtils]: Spent 881.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:09:31,709 WARN L205 SmtUtils]: Spent 895.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:09:32,347 WARN L205 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:09:33,023 WARN L205 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:09:34,086 WARN L205 SmtUtils]: Spent 475.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:09:35,314 WARN L205 SmtUtils]: Spent 479.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:09:35,853 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 13:09:36,146 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 13:09:36,679 WARN L205 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:09:37,516 WARN L205 SmtUtils]: Spent 391.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:09:38,615 WARN L205 SmtUtils]: Spent 538.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:09:39,253 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 13:09:39,838 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-02 13:09:40,385 WARN L205 SmtUtils]: Spent 227.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:09:41,187 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 13:09:41,807 WARN L205 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 13:09:42,220 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 13:09:42,893 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 13:09:43,519 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 13:09:44,087 WARN L205 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 13:09:44,376 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 13:09:44,847 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-02 13:09:45,202 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 13:09:45,590 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-02 13:09:45,885 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 13:09:47,247 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 13:09:47,541 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 13:09:48,400 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 13:09:49,697 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-02 13:09:49,967 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 13:09:50,929 WARN L205 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-02 13:09:51,223 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-02 13:09:52,660 WARN L205 SmtUtils]: Spent 273.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 13:09:54,681 WARN L205 SmtUtils]: Spent 448.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:09:55,023 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-05-02 13:09:59,243 WARN L205 SmtUtils]: Spent 1.19 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:10:00,740 WARN L205 SmtUtils]: Spent 682.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:10:05,124 WARN L205 SmtUtils]: Spent 1.86 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:10:08,398 WARN L205 SmtUtils]: Spent 1.96 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:10:11,279 WARN L205 SmtUtils]: Spent 994.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:10:14,905 WARN L205 SmtUtils]: Spent 1.45 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:10:17,168 WARN L205 SmtUtils]: Spent 512.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:10:18,666 WARN L205 SmtUtils]: Spent 679.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:10:21,735 WARN L205 SmtUtils]: Spent 1.57 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:10:23,929 WARN L205 SmtUtils]: Spent 513.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:10:24,753 WARN L205 SmtUtils]: Spent 356.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 13:10:26,527 WARN L205 SmtUtils]: Spent 727.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:10:29,533 WARN L205 SmtUtils]: Spent 1.48 s on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:10:31,373 WARN L205 SmtUtils]: Spent 346.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 13:10:31,937 WARN L205 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 13:10:34,319 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 13:10:34,739 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 13:10:35,362 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-02 13:10:38,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:10:38,775 INFO L93 Difference]: Finished difference Result 639 states and 804 transitions. [2021-05-02 13:10:38,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-05-02 13:10:38,783 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.8064516129032258) internal successors, (56), 30 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 43 [2021-05-02 13:10:38,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:10:38,785 INFO L225 Difference]: With dead ends: 639 [2021-05-02 13:10:38,785 INFO L226 Difference]: Without dead ends: 578 [2021-05-02 13:10:38,786 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6214 ImplicationChecksByTransitivity, 105286.9ms TimeCoverageRelationStatistics Valid=1835, Invalid=18187, Unknown=0, NotChecked=0, Total=20022 [2021-05-02 13:10:38,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 578 states. [2021-05-02 13:10:38,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 578 to 413. [2021-05-02 13:10:38,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 408 states have (on average 1.2696078431372548) internal successors, (518), 408 states have internal predecessors, (518), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:10:38,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 522 transitions. [2021-05-02 13:10:38,819 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 522 transitions. Word has length 43 [2021-05-02 13:10:38,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:10:38,819 INFO L480 AbstractCegarLoop]: Abstraction has 413 states and 522 transitions. [2021-05-02 13:10:38,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.8064516129032258) internal successors, (56), 30 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 13:10:38,820 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 522 transitions. [2021-05-02 13:10:38,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:10:38,820 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:10:38,820 INFO L523 BasicCegarLoop]: trace histogram [19, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:10:39,039 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 13:10:39,040 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:10:39,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:10:39,040 INFO L82 PathProgramCache]: Analyzing trace with hash 1240885679, now seen corresponding path program 20 times [2021-05-02 13:10:39,040 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:10:39,040 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740819262] [2021-05-02 13:10:39,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:10:39,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:10:41,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:10:41,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:10:41,401 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 0 proven. 193 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:10:41,401 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:10:41,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740819262] [2021-05-02 13:10:41,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740819262] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:10:41,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [720552940] [2021-05-02 13:10:41,402 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 13:10:41,453 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:10:41,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:10:41,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 13:10:41,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:10:41,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:10:42,106 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 0 proven. 193 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:10:42,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [720552940] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:10:42,106 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:10:42,106 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 22] total 26 [2021-05-02 13:10:42,107 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749981708] [2021-05-02 13:10:42,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:10:42,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:10:42,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:10:42,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:10:42,107 INFO L87 Difference]: Start difference. First operand 413 states and 522 transitions. Second operand has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:10:45,368 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:10:45,846 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:11:00,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:11:00,471 INFO L93 Difference]: Finished difference Result 874 states and 1197 transitions. [2021-05-02 13:11:00,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 13:11:00,476 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 13:11:00,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:11:00,478 INFO L225 Difference]: With dead ends: 874 [2021-05-02 13:11:00,479 INFO L226 Difference]: Without dead ends: 822 [2021-05-02 13:11:00,479 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 6111.9ms TimeCoverageRelationStatistics Valid=173, Invalid=2479, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:11:00,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 822 states. [2021-05-02 13:11:00,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 822 to 431. [2021-05-02 13:11:00,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 431 states, 426 states have (on average 1.2769953051643192) internal successors, (544), 426 states have internal predecessors, (544), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:11:00,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 548 transitions. [2021-05-02 13:11:00,510 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 548 transitions. Word has length 43 [2021-05-02 13:11:00,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:11:00,511 INFO L480 AbstractCegarLoop]: Abstraction has 431 states and 548 transitions. [2021-05-02 13:11:00,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:11:00,511 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 548 transitions. [2021-05-02 13:11:00,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:11:00,511 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:11:00,512 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:11:00,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:11:00,712 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:11:00,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:11:00,712 INFO L82 PathProgramCache]: Analyzing trace with hash 838810082, now seen corresponding path program 21 times [2021-05-02 13:11:00,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:11:00,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149610393] [2021-05-02 13:11:00,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:11:00,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:11:01,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:11:01,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:11:01,705 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 21 proven. 31 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:11:01,705 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:11:01,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149610393] [2021-05-02 13:11:01,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1149610393] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:11:01,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1330611264] [2021-05-02 13:11:01,705 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 13:11:02,015 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 13:11:02,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:11:02,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 13:11:02,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:11:03,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:11:03,233 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 10 proven. 32 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-05-02 13:11:03,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1330611264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:11:03,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:11:03,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9] total 22 [2021-05-02 13:11:03,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223361397] [2021-05-02 13:11:03,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:11:03,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:11:03,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:11:03,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=355, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:11:03,235 INFO L87 Difference]: Start difference. First operand 431 states and 548 transitions. Second operand has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 21 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 13:11:05,245 WARN L205 SmtUtils]: Spent 377.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:11:07,571 WARN L205 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:11:07,996 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:11:08,302 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 13:11:09,270 WARN L205 SmtUtils]: Spent 277.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:11:09,667 WARN L205 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:11:09,975 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-02 13:11:11,017 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:11:11,394 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 13:11:11,733 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 13:11:12,767 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-02 13:11:13,302 WARN L205 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:11:13,704 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:11:14,690 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:11:14,952 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-02 13:11:15,358 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-02 13:11:15,901 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:11:16,146 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 13:11:16,618 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:11:17,014 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-02 13:11:17,948 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-02 13:11:18,512 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 13:11:18,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:11:18,679 INFO L93 Difference]: Finished difference Result 593 states and 774 transitions. [2021-05-02 13:11:18,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 13:11:18,685 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 21 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 44 [2021-05-02 13:11:18,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:11:18,687 INFO L225 Difference]: With dead ends: 593 [2021-05-02 13:11:18,687 INFO L226 Difference]: Without dead ends: 576 [2021-05-02 13:11:18,688 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 805 ImplicationChecksByTransitivity, 11389.5ms TimeCoverageRelationStatistics Valid=630, Invalid=2562, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 13:11:18,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2021-05-02 13:11:18,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 516. [2021-05-02 13:11:18,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 516 states, 511 states have (on average 1.3013698630136987) internal successors, (665), 511 states have internal predecessors, (665), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:11:18,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 516 states to 516 states and 669 transitions. [2021-05-02 13:11:18,720 INFO L78 Accepts]: Start accepts. Automaton has 516 states and 669 transitions. Word has length 44 [2021-05-02 13:11:18,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:11:18,720 INFO L480 AbstractCegarLoop]: Abstraction has 516 states and 669 transitions. [2021-05-02 13:11:18,720 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 21 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 13:11:18,720 INFO L276 IsEmpty]: Start isEmpty. Operand 516 states and 669 transitions. [2021-05-02 13:11:18,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:11:18,737 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:11:18,737 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:11:18,952 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-05-02 13:11:18,953 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:11:18,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:11:18,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1738188893, now seen corresponding path program 9 times [2021-05-02 13:11:18,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:11:18,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758002174] [2021-05-02 13:11:18,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:11:18,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:11:21,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:11:21,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:11:21,413 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 13:11:21,413 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:11:21,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758002174] [2021-05-02 13:11:21,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758002174] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:11:21,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389984261] [2021-05-02 13:11:21,413 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 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 13:11:21,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 13:11:21,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:11:21,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 61 conjunts are in the unsatisfiable core [2021-05-02 13:11:21,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:11:22,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:11:22,567 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 13:11:22,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [389984261] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:11:22,567 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:11:22,567 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22] total 24 [2021-05-02 13:11:22,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293345794] [2021-05-02 13:11:22,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:11:22,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:11:22,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:11:22,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:11:22,568 INFO L87 Difference]: Start difference. First operand 516 states and 669 transitions. Second operand has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 23 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 13:11:25,123 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:11:25,913 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:11:26,495 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:26,940 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:11:27,357 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:27,618 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:27,866 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:28,081 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:11:28,339 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:28,612 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:31,510 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:31,778 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:32,009 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:32,239 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:32,996 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:33,241 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:33,524 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:11:33,874 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:34,114 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:34,394 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:34,686 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:35,014 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:35,287 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:35,591 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:35,953 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:36,225 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:11:36,501 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:37,032 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:37,318 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:37,717 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:38,073 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:11:38,435 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:38,952 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:39,309 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:39,702 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:40,707 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:41,586 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:42,043 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:42,751 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:42,983 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:43,757 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:44,001 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:45,075 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:45,363 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:46,138 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:46,984 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:48,004 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:48,701 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:49,089 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:49,580 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:11:49,844 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:50,532 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:51,219 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:51,484 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:52,079 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:11:53,094 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:53,545 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:53,843 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:54,622 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:55,392 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:55,854 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:56,339 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:11:56,627 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:57,244 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:57,852 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:11:58,566 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:11:58,951 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:12:00,281 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:12:00,638 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:12:01,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:12:01,275 INFO L93 Difference]: Finished difference Result 698 states and 932 transitions. [2021-05-02 13:12:01,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-05-02 13:12:01,283 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 23 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 13:12:01,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:12:01,285 INFO L225 Difference]: With dead ends: 698 [2021-05-02 13:12:01,285 INFO L226 Difference]: Without dead ends: 660 [2021-05-02 13:12:01,286 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6678 ImplicationChecksByTransitivity, 22854.4ms TimeCoverageRelationStatistics Valid=828, Invalid=18912, Unknown=0, NotChecked=0, Total=19740 [2021-05-02 13:12:01,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 660 states. [2021-05-02 13:12:01,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 660 to 531. [2021-05-02 13:12:01,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 531 states, 526 states have (on average 1.2946768060836502) internal successors, (681), 526 states have internal predecessors, (681), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:12:01,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 531 states to 531 states and 685 transitions. [2021-05-02 13:12:01,318 INFO L78 Accepts]: Start accepts. Automaton has 531 states and 685 transitions. Word has length 44 [2021-05-02 13:12:01,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:12:01,318 INFO L480 AbstractCegarLoop]: Abstraction has 531 states and 685 transitions. [2021-05-02 13:12:01,318 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 23 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 13:12:01,318 INFO L276 IsEmpty]: Start isEmpty. Operand 531 states and 685 transitions. [2021-05-02 13:12:01,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:12:01,319 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:12:01,319 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:12:01,519 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-02 13:12:01,520 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:12:01,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:12:01,520 INFO L82 PathProgramCache]: Analyzing trace with hash -740863102, now seen corresponding path program 17 times [2021-05-02 13:12:01,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:12:01,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1486443234] [2021-05-02 13:12:01,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:12:01,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:12:03,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:12:03,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:12:03,162 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-05-02 13:12:03,163 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:12:03,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1486443234] [2021-05-02 13:12:03,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1486443234] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:12:03,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550991483] [2021-05-02 13:12:03,163 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 13:12:05,219 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 13:12:05,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:12:05,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 13:12:05,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:12:05,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:12:05,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:12:06,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:12:06,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:12:07,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:12:07,885 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 13:12:07,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550991483] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:12:07,886 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:12:07,886 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 24] total 26 [2021-05-02 13:12:07,886 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998261046] [2021-05-02 13:12:07,886 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:12:07,886 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:12:07,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:12:07,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=590, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:12:07,887 INFO L87 Difference]: Start difference. First operand 531 states and 685 transitions. Second operand has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 25 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 13:12:08,478 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:12:08,985 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:12:09,255 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:12:09,736 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:12:10,271 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:12:11,131 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:12:11,390 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:12:11,644 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:12:12,446 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:12:19,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:12:19,294 INFO L93 Difference]: Finished difference Result 777 states and 980 transitions. [2021-05-02 13:12:19,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 13:12:19,301 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 25 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 44 [2021-05-02 13:12:19,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:12:19,303 INFO L225 Difference]: With dead ends: 777 [2021-05-02 13:12:19,303 INFO L226 Difference]: Without dead ends: 755 [2021-05-02 13:12:19,304 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 7450.3ms TimeCoverageRelationStatistics Valid=209, Invalid=2443, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:12:19,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-05-02 13:12:19,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 531. [2021-05-02 13:12:19,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 531 states, 526 states have (on average 1.2927756653992395) internal successors, (680), 526 states have internal predecessors, (680), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:12:19,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 531 states to 531 states and 684 transitions. [2021-05-02 13:12:19,336 INFO L78 Accepts]: Start accepts. Automaton has 531 states and 684 transitions. Word has length 44 [2021-05-02 13:12:19,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:12:19,336 INFO L480 AbstractCegarLoop]: Abstraction has 531 states and 684 transitions. [2021-05-02 13:12:19,336 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 25 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 13:12:19,336 INFO L276 IsEmpty]: Start isEmpty. Operand 531 states and 684 transitions. [2021-05-02 13:12:19,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:12:19,337 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:12:19,337 INFO L523 BasicCegarLoop]: trace histogram [20, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:12:19,537 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-05-02 13:12:19,538 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:12:19,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:12:19,538 INFO L82 PathProgramCache]: Analyzing trace with hash -1104595838, now seen corresponding path program 22 times [2021-05-02 13:12:19,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:12:19,538 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758736485] [2021-05-02 13:12:19,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:12:19,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:12:21,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:12:21,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:12:21,964 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 213 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:12:21,964 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:12:21,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758736485] [2021-05-02 13:12:21,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [758736485] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:12:21,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773033386] [2021-05-02 13:12:21,965 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 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 13:12:22,017 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:12:22,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:12:22,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 13:12:22,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:12:22,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:12:22,817 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 213 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:12:22,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1773033386] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:12:22,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:12:22,818 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 13:12:22,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245939118] [2021-05-02 13:12:22,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:12:22,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:12:22,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:12:22,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=700, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:12:22,818 INFO L87 Difference]: Start difference. First operand 531 states and 684 transitions. Second operand has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 27 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 13:12:34,139 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:12:43,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:12:43,266 INFO L93 Difference]: Finished difference Result 1116 states and 1569 transitions. [2021-05-02 13:12:43,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:12:43,273 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 27 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 44 [2021-05-02 13:12:43,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:12:43,275 INFO L225 Difference]: With dead ends: 1116 [2021-05-02 13:12:43,276 INFO L226 Difference]: Without dead ends: 1050 [2021-05-02 13:12:43,276 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 6771.7ms TimeCoverageRelationStatistics Valid=182, Invalid=2788, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 13:12:43,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1050 states. [2021-05-02 13:12:43,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1050 to 553. [2021-05-02 13:12:43,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 548 states have (on average 1.2992700729927007) internal successors, (712), 548 states have internal predecessors, (712), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:12:43,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 716 transitions. [2021-05-02 13:12:43,312 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 716 transitions. Word has length 44 [2021-05-02 13:12:43,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:12:43,312 INFO L480 AbstractCegarLoop]: Abstraction has 553 states and 716 transitions. [2021-05-02 13:12:43,312 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 27 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 13:12:43,312 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 716 transitions. [2021-05-02 13:12:43,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:12:43,313 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:12:43,313 INFO L523 BasicCegarLoop]: trace histogram [21, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:12:43,513 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-02 13:12:43,513 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:12:43,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:12:43,514 INFO L82 PathProgramCache]: Analyzing trace with hash -800078833, now seen corresponding path program 23 times [2021-05-02 13:12:43,514 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:12:43,514 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290698985] [2021-05-02 13:12:43,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:12:43,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:12:46,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:12:46,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:12:46,201 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:12:46,201 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:12:46,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290698985] [2021-05-02 13:12:46,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290698985] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:12:46,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1428503148] [2021-05-02 13:12:46,202 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 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 13:12:49,360 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-02 13:12:49,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:12:49,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 13:12:49,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:12:49,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:12:50,097 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:12:50,097 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1428503148] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:12:50,097 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:12:50,097 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 24] total 28 [2021-05-02 13:12:50,097 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650702632] [2021-05-02 13:12:50,098 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:12:50,098 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:12:50,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:12:50,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:12:50,098 INFO L87 Difference]: Start difference. First operand 553 states and 716 transitions. Second operand has 28 states, 28 states have (on average 1.6071428571428572) internal successors, (45), 27 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:12:51,704 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:12:59,459 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:13:01,968 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:13:02,944 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:13:03,489 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:12,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:13:12,778 INFO L93 Difference]: Finished difference Result 1163 states and 1640 transitions. [2021-05-02 13:13:12,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:13:12,785 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.6071428571428572) internal successors, (45), 27 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 13:13:12,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:13:12,788 INFO L225 Difference]: With dead ends: 1163 [2021-05-02 13:13:12,788 INFO L226 Difference]: Without dead ends: 1097 [2021-05-02 13:13:12,788 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 7231.2ms TimeCoverageRelationStatistics Valid=185, Invalid=2895, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:13:12,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1097 states. [2021-05-02 13:13:12,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1097 to 575. [2021-05-02 13:13:12,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 570 states have (on average 1.305263157894737) internal successors, (744), 570 states have internal predecessors, (744), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:13:12,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 748 transitions. [2021-05-02 13:13:12,830 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 748 transitions. Word has length 45 [2021-05-02 13:13:12,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:13:12,830 INFO L480 AbstractCegarLoop]: Abstraction has 575 states and 748 transitions. [2021-05-02 13:13:12,830 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.6071428571428572) internal successors, (45), 27 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:13:12,830 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 748 transitions. [2021-05-02 13:13:12,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 13:13:12,831 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:13:12,831 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:13:13,036 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:13:13,036 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:13:13,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:13:13,036 INFO L82 PathProgramCache]: Analyzing trace with hash -1656121886, now seen corresponding path program 18 times [2021-05-02 13:13:13,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:13:13,037 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [948738863] [2021-05-02 13:13:13,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:13:13,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:13:14,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:13:14,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:13:14,844 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 13:13:14,844 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:13:14,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [948738863] [2021-05-02 13:13:14,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [948738863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:13:14,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614475560] [2021-05-02 13:13:14,844 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:13:15,089 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-05-02 13:13:15,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:13:15,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 13:13:15,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:13:15,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:15,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:15,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:15,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:15,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:15,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:16,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:16,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:16,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:16,994 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 125 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:13:16,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614475560] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:13:16,995 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:13:16,995 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 24] total 26 [2021-05-02 13:13:16,995 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525720893] [2021-05-02 13:13:16,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:13:16,995 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:13:16,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:13:16,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=590, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:13:16,996 INFO L87 Difference]: Start difference. First operand 575 states and 748 transitions. Second operand has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 25 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 13:13:17,649 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:13:18,633 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:13:19,195 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 13:13:19,445 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:13:19,950 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:20,187 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:13:20,992 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:13:21,523 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:21,764 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:22,033 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:13:22,518 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:22,783 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:23,051 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 13:13:23,367 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:23,663 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:23,957 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:24,328 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:24,613 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:24,973 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:25,236 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:25,663 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:26,084 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 13:13:30,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:13:30,667 INFO L93 Difference]: Finished difference Result 805 states and 1027 transitions. [2021-05-02 13:13:30,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:13:30,674 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 25 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 46 [2021-05-02 13:13:30,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:13:30,676 INFO L225 Difference]: With dead ends: 805 [2021-05-02 13:13:30,676 INFO L226 Difference]: Without dead ends: 782 [2021-05-02 13:13:30,677 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 518 ImplicationChecksByTransitivity, 8201.0ms TimeCoverageRelationStatistics Valid=244, Invalid=2948, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 13:13:30,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 782 states. [2021-05-02 13:13:30,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 782 to 575. [2021-05-02 13:13:30,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 570 states have (on average 1.3035087719298246) internal successors, (743), 570 states have internal predecessors, (743), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:13:30,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 747 transitions. [2021-05-02 13:13:30,712 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 747 transitions. Word has length 46 [2021-05-02 13:13:30,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:13:30,713 INFO L480 AbstractCegarLoop]: Abstraction has 575 states and 747 transitions. [2021-05-02 13:13:30,713 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 25 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 13:13:30,713 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 747 transitions. [2021-05-02 13:13:30,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 13:13:30,713 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:13:30,714 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:13:30,914 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,57 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:13:30,914 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:13:30,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:13:30,914 INFO L82 PathProgramCache]: Analyzing trace with hash -1423292557, now seen corresponding path program 10 times [2021-05-02 13:13:30,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:13:30,915 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228277227] [2021-05-02 13:13:30,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:13:30,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:13:33,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:13:33,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:13:33,351 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-05-02 13:13:33,351 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:13:33,352 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [228277227] [2021-05-02 13:13:33,352 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [228277227] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:13:33,352 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222720956] [2021-05-02 13:13:33,352 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 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 13:13:33,407 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:13:33,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:13:33,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 13:13:33,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:13:36,427 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 18 proven. 81 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:13:36,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222720956] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:13:36,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:13:36,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 12] total 34 [2021-05-02 13:13:36,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474136065] [2021-05-02 13:13:36,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:13:36,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:13:36,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:13:36,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=1048, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:13:36,428 INFO L87 Difference]: Start difference. First operand 575 states and 747 transitions. Second operand has 34 states, 34 states have (on average 1.7647058823529411) internal successors, (60), 33 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 13:13:36,934 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 13:13:37,337 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-02 13:13:37,841 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-02 13:13:38,452 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-02 13:13:39,207 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 13:13:40,302 WARN L205 SmtUtils]: Spent 436.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:13:41,761 WARN L205 SmtUtils]: Spent 696.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:13:46,354 WARN L205 SmtUtils]: Spent 2.24 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:13:48,550 WARN L205 SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:13:53,332 WARN L205 SmtUtils]: Spent 3.04 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:13:59,774 WARN L205 SmtUtils]: Spent 3.70 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:14:03,488 WARN L205 SmtUtils]: Spent 2.02 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:14:10,201 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:14:16,405 WARN L205 SmtUtils]: Spent 3.42 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:14:22,361 WARN L205 SmtUtils]: Spent 3.40 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:14:29,776 WARN L205 SmtUtils]: Spent 4.44 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:14:34,628 WARN L205 SmtUtils]: Spent 2.62 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:14:40,952 WARN L205 SmtUtils]: Spent 3.82 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:14:47,985 WARN L205 SmtUtils]: Spent 4.08 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:14:55,925 WARN L205 SmtUtils]: Spent 3.35 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:14:59,713 WARN L205 SmtUtils]: Spent 1.60 s on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:15:03,655 WARN L205 SmtUtils]: Spent 1.26 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:15:10,389 WARN L205 SmtUtils]: Spent 3.79 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:15:15,471 WARN L205 SmtUtils]: Spent 2.78 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:15:21,650 WARN L205 SmtUtils]: Spent 2.47 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:15:23,352 WARN L205 SmtUtils]: Spent 882.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:15:26,086 WARN L205 SmtUtils]: Spent 1.54 s on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:15:29,341 WARN L205 SmtUtils]: Spent 1.40 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:15:34,776 WARN L205 SmtUtils]: Spent 3.57 s on a formula simplification that was a NOOP. DAG size: 75 [2021-05-02 13:15:38,066 WARN L205 SmtUtils]: Spent 1.92 s on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 13:15:39,102 WARN L205 SmtUtils]: Spent 446.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:15:40,301 WARN L205 SmtUtils]: Spent 561.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:15:42,394 WARN L205 SmtUtils]: Spent 996.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:15:45,368 WARN L205 SmtUtils]: Spent 1.32 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:15:49,874 WARN L205 SmtUtils]: Spent 2.78 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:15:50,529 WARN L205 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:15:51,539 WARN L205 SmtUtils]: Spent 378.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:15:52,675 WARN L205 SmtUtils]: Spent 527.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:15:54,380 WARN L205 SmtUtils]: Spent 773.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:15:56,694 WARN L205 SmtUtils]: Spent 943.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:16:00,939 WARN L205 SmtUtils]: Spent 1.61 s on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:16:01,567 WARN L205 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:16:02,198 WARN L205 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:16:03,006 WARN L205 SmtUtils]: Spent 370.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:16:04,293 WARN L205 SmtUtils]: Spent 577.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:16:06,301 WARN L205 SmtUtils]: Spent 1.11 s on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:16:06,856 WARN L205 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:16:07,220 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 13:16:07,806 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:16:08,556 WARN L205 SmtUtils]: Spent 341.00 ms on a formula simplification that was a NOOP. DAG size: 59