/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/nla-digbench-scaling/fermat1-ll_unwindbound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 15:01:26,256 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 15:01:26,258 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 15:01:26,301 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 15:01:26,320 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 15:01:26,322 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 15:01:26,323 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 15:01:26,325 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 15:01:26,328 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 15:01:26,329 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 15:01:26,331 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 15:01:26,341 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 15:01:26,343 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 15:01:26,344 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 15:01:26,359 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 15:01:26,362 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 15:01:26,368 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 15:01:26,378 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 15:01:26,379 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 15:01:26,379 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 15:01:26,383 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 15:01:26,418 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 15:01:26,418 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 15:01:26,422 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 15:01:26,422 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 15:01:26,422 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 15:01:26,422 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 15:01:26,423 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 15:01:26,423 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 15:01:26,423 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 15:01:26,423 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 15:01:26,424 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 15:01:26,424 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 15:01:26,424 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 15:01:26,424 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 15:01:26,425 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 15:01:26,425 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 15:01:26,425 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 15:01:26,425 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 15:01:26,425 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 15:01:26,425 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 15:01:26,426 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:01:26,426 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 15:01:26,426 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 15:01:26,426 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 15:01:26,426 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 15:01:26,426 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 15:01:26,427 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 15:01:26,427 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 15:01:26,427 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 15:01:26,727 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 15:01:26,759 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 15:01:26,762 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 15:01:26,763 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 15:01:26,764 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 15:01:26,765 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/fermat1-ll_unwindbound10.c [2021-05-02 15:01:26,835 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ebca5f136/f4fe86d4d0f44755afe1747ec5549035/FLAG0f14d0d82 [2021-05-02 15:01:27,431 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 15:01:27,432 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/fermat1-ll_unwindbound10.c [2021-05-02 15:01:27,437 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ebca5f136/f4fe86d4d0f44755afe1747ec5549035/FLAG0f14d0d82 [2021-05-02 15:01:27,689 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ebca5f136/f4fe86d4d0f44755afe1747ec5549035 [2021-05-02 15:01:27,691 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 15:01:27,693 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 15:01:27,696 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 15:01:27,696 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 15:01:27,699 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 15:01:27,700 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:01:27" (1/1) ... [2021-05-02 15:01:27,701 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e6b4946 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:01:27, skipping insertion in model container [2021-05-02 15:01:27,701 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:01:27" (1/1) ... [2021-05-02 15:01:27,707 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 15:01:27,718 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 15:01:27,817 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/fermat1-ll_unwindbound10.c[535,548] [2021-05-02 15:01:27,835 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:01:27,842 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 15:01:27,894 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/fermat1-ll_unwindbound10.c[535,548] [2021-05-02 15:01:27,909 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:01:27,923 INFO L208 MainTranslator]: Completed translation [2021-05-02 15:01:27,924 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:01:27 WrapperNode [2021-05-02 15:01:27,924 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 15:01:27,925 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 15:01:27,925 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 15:01:27,926 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 15:01:27,935 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:01:27" (1/1) ... [2021-05-02 15:01:27,935 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:01:27" (1/1) ... [2021-05-02 15:01:27,951 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:01:27" (1/1) ... [2021-05-02 15:01:27,951 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:01:27" (1/1) ... [2021-05-02 15:01:27,956 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:01:27" (1/1) ... [2021-05-02 15:01:27,959 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:01:27" (1/1) ... [2021-05-02 15:01:27,966 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:01:27" (1/1) ... [2021-05-02 15:01:27,974 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 15:01:27,975 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 15:01:27,975 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 15:01:27,976 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 15:01:27,976 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:01:27" (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 15:01:28,047 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 15:01:28,047 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 15:01:28,047 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 15:01:28,048 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 15:01:28,048 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 15:01:28,048 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 15:01:28,048 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 15:01:28,048 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 15:01:28,049 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 15:01:28,049 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 15:01:28,049 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 15:01:28,049 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 15:01:28,050 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 15:01:28,050 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 15:01:28,051 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 15:01:28,051 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 15:01:28,051 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 15:01:28,051 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 15:01:28,051 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 15:01:28,051 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 15:01:28,401 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 15:01:28,402 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-02 15:01:28,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:01:28 BoogieIcfgContainer [2021-05-02 15:01:28,403 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 15:01:28,406 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 15:01:28,406 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 15:01:28,408 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 15:01:28,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 03:01:27" (1/3) ... [2021-05-02 15:01:28,409 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@322d8684 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:01:28, skipping insertion in model container [2021-05-02 15:01:28,409 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:01:27" (2/3) ... [2021-05-02 15:01:28,410 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@322d8684 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:01:28, skipping insertion in model container [2021-05-02 15:01:28,410 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:01:28" (3/3) ... [2021-05-02 15:01:28,411 INFO L111 eAbstractionObserver]: Analyzing ICFG fermat1-ll_unwindbound10.c [2021-05-02 15:01:28,417 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 15:01:28,420 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 15:01:28,434 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 15:01:28,464 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 15:01:28,464 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 15:01:28,464 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 15:01:28,464 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 15:01:28,464 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 15:01:28,464 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 15:01:28,465 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 15:01:28,465 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 15:01:28,483 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:01:28,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 15:01:28,488 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:01:28,488 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:01:28,489 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:01:28,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:01:28,494 INFO L82 PathProgramCache]: Analyzing trace with hash 928708300, now seen corresponding path program 1 times [2021-05-02 15:01:28,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:01:28,503 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799296105] [2021-05-02 15:01:28,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:01:28,615 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:01:28,616 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [10855384] [2021-05-02 15:01:28,616 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 15:01:28,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:01:28,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 1 conjunts are in the unsatisfiable core [2021-05-02 15:01:28,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:01:28,884 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 15:01:28,884 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:01:28,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799296105] [2021-05-02 15:01:28,885 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:01:28,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10855384] [2021-05-02 15:01:28,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [10855384] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:01:28,886 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:01:28,886 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-05-02 15:01:28,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906949412] [2021-05-02 15:01:28,891 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2021-05-02 15:01:28,891 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:01:28,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-05-02 15:01:28,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-05-02 15:01:28,901 INFO L87 Difference]: Start difference. First operand has 37 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:01:28,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:01:28,919 INFO L93 Difference]: Finished difference Result 67 states and 100 transitions. [2021-05-02 15:01:28,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-05-02 15:01:28,921 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-02 15:01:28,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:01:28,927 INFO L225 Difference]: With dead ends: 67 [2021-05-02 15:01:28,927 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 15:01:28,930 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-05-02 15:01:28,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 15:01:28,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 15:01:28,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 15:01:28,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2021-05-02 15:01:28,960 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 22 [2021-05-02 15:01:28,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:01:28,960 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2021-05-02 15:01:28,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:01:28,960 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2021-05-02 15:01:28,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 15:01:28,962 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:01:28,962 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 15:01:29,177 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-05-02 15:01:29,177 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:01:29,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:01:29,178 INFO L82 PathProgramCache]: Analyzing trace with hash -155606603, now seen corresponding path program 1 times [2021-05-02 15:01:29,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:01:29,178 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227437333] [2021-05-02 15:01:29,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:01:29,191 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:01:29,191 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1349344229] [2021-05-02 15:01:29,191 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 15:01:29,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:01:29,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 15:01:29,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:01:29,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:29,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:29,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:29,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:29,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:29,364 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:01:29,365 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:01:29,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227437333] [2021-05-02 15:01:29,365 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:01:29,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349344229] [2021-05-02 15:01:29,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1349344229] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:01:29,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:01:29,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 15:01:29,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814878161] [2021-05-02 15:01:29,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 15:01:29,367 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:01:29,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 15:01:29,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:01:29,368 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:01:29,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:01:29,396 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2021-05-02 15:01:29,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 15:01:29,409 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 15:01:29,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:01:29,410 INFO L225 Difference]: With dead ends: 41 [2021-05-02 15:01:29,410 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 15:01:29,411 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.2ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:01:29,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 15:01:29,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 15:01:29,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 23 states have internal predecessors, (29), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 15:01:29,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2021-05-02 15:01:29,417 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 23 [2021-05-02 15:01:29,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:01:29,418 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2021-05-02 15:01:29,419 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:01:29,419 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2021-05-02 15:01:29,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 15:01:29,419 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:01:29,419 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 15:01:29,634 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:01:29,634 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:01:29,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:01:29,635 INFO L82 PathProgramCache]: Analyzing trace with hash -153938307, now seen corresponding path program 1 times [2021-05-02 15:01:29,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:01:29,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388825126] [2021-05-02 15:01:29,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:01:29,654 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:01:29,654 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [382470647] [2021-05-02 15:01:29,654 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 15:01:29,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:01:29,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 15:01:29,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:01:29,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:29,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:29,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:29,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:29,925 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 15:01:29,925 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:01:29,925 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388825126] [2021-05-02 15:01:29,925 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:01:29,925 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382470647] [2021-05-02 15:01:29,925 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [382470647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:01:29,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:01:29,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:01:29,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188265027] [2021-05-02 15:01:29,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:01:29,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:01:29,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:01:29,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:01:29,927 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:01:36,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:01:36,187 INFO L93 Difference]: Finished difference Result 53 states and 70 transitions. [2021-05-02 15:01:36,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:01:36,188 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 15:01:36,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:01:36,190 INFO L225 Difference]: With dead ends: 53 [2021-05-02 15:01:36,190 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 15:01:36,191 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 98.6ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:01:36,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 15:01:36,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-05-02 15:01:36,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 35 states have internal predecessors, (47), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 15:01:36,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 67 transitions. [2021-05-02 15:01:36,203 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 67 transitions. Word has length 23 [2021-05-02 15:01:36,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:01:36,203 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 67 transitions. [2021-05-02 15:01:36,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:01:36,204 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 67 transitions. [2021-05-02 15:01:36,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 15:01:36,204 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:01:36,205 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, 1, 1, 1, 1] [2021-05-02 15:01:36,421 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:01:36,421 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:01:36,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:01:36,422 INFO L82 PathProgramCache]: Analyzing trace with hash -1676885497, now seen corresponding path program 1 times [2021-05-02 15:01:36,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:01:36,422 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628127554] [2021-05-02 15:01:36,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:01:36,443 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:01:36,443 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1446003162] [2021-05-02 15:01:36,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 15:01:36,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:01:36,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 15:01:36,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:01:36,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:36,892 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 15:01:36,893 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:01:36,893 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628127554] [2021-05-02 15:01:36,893 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:01:36,893 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1446003162] [2021-05-02 15:01:36,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1446003162] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:01:36,893 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:01:36,894 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 15:01:36,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111436941] [2021-05-02 15:01:36,894 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 15:01:36,894 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:01:36,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 15:01:36,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:01:36,895 INFO L87 Difference]: Start difference. First operand 50 states and 67 transitions. Second operand has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:01:55,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:01:55,088 INFO L93 Difference]: Finished difference Result 85 states and 116 transitions. [2021-05-02 15:01:55,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:01:55,088 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2021-05-02 15:01:55,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:01:55,092 INFO L225 Difference]: With dead ends: 85 [2021-05-02 15:01:55,092 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 15:01:55,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 216.1ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-02 15:01:55,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 15:01:55,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 75. [2021-05-02 15:01:55,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 52 states have (on average 1.3846153846153846) internal successors, (72), 56 states have internal predecessors, (72), 17 states have call successors, (17), 6 states have call predecessors, (17), 5 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 15:01:55,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 104 transitions. [2021-05-02 15:01:55,110 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 104 transitions. Word has length 29 [2021-05-02 15:01:55,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:01:55,110 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 104 transitions. [2021-05-02 15:01:55,110 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:01:55,110 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 104 transitions. [2021-05-02 15:01:55,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 15:01:55,111 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:01:55,111 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:01:55,322 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:01:55,322 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:01:55,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:01:55,323 INFO L82 PathProgramCache]: Analyzing trace with hash 1154059858, now seen corresponding path program 1 times [2021-05-02 15:01:55,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:01:55,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006731648] [2021-05-02 15:01:55,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:01:55,330 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:01:55,330 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [24449088] [2021-05-02 15:01:55,330 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 15:01:55,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:01:55,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 15:01:55,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:01:55,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,476 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:01:55,477 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:01:55,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006731648] [2021-05-02 15:01:55,477 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:01:55,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [24449088] [2021-05-02 15:01:55,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [24449088] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:01:55,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:01:55,478 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 15:01:55,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434278471] [2021-05-02 15:01:55,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 15:01:55,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:01:55,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 15:01:55,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:01:55,479 INFO L87 Difference]: Start difference. First operand 75 states and 104 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:01:55,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:01:55,522 INFO L93 Difference]: Finished difference Result 143 states and 201 transitions. [2021-05-02 15:01:55,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 15:01:55,522 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 35 [2021-05-02 15:01:55,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:01:55,523 INFO L225 Difference]: With dead ends: 143 [2021-05-02 15:01:55,524 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 15:01:55,524 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 10.6ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:01:55,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 15:01:55,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-05-02 15:01:55,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 62 states have internal predecessors, (78), 18 states have call successors, (18), 7 states have call predecessors, (18), 6 states have return successors, (16), 13 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 15:01:55,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 112 transitions. [2021-05-02 15:01:55,539 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 112 transitions. Word has length 35 [2021-05-02 15:01:55,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:01:55,539 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 112 transitions. [2021-05-02 15:01:55,539 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:01:55,539 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 112 transitions. [2021-05-02 15:01:55,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 15:01:55,540 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:01:55,543 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:01:55,766 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:01:55,766 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:01:55,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:01:55,767 INFO L82 PathProgramCache]: Analyzing trace with hash 1810200309, now seen corresponding path program 1 times [2021-05-02 15:01:55,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:01:55,767 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2096847737] [2021-05-02 15:01:55,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:01:55,781 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:01:55,781 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [257159185] [2021-05-02 15:01:55,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:01:55,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:01:55,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 15:01:55,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:01:55,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:55,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:56,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,095 WARN L205 SmtUtils]: Spent 2.02 s on a formula simplification that was a NOOP. DAG size: 28 [2021-05-02 15:01:58,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:01:58,202 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 15:01:58,202 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:01:58,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2096847737] [2021-05-02 15:01:58,202 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:01:58,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257159185] [2021-05-02 15:01:58,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257159185] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:01:58,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:01:58,203 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 15:01:58,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725447681] [2021-05-02 15:01:58,203 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 15:01:58,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:01:58,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 15:01:58,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:01:58,204 INFO L87 Difference]: Start difference. First operand 83 states and 112 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:02:04,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:02:04,044 INFO L93 Difference]: Finished difference Result 117 states and 159 transitions. [2021-05-02 15:02:04,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 15:02:04,045 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 39 [2021-05-02 15:02:04,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:02:04,046 INFO L225 Difference]: With dead ends: 117 [2021-05-02 15:02:04,046 INFO L226 Difference]: Without dead ends: 115 [2021-05-02 15:02:04,047 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 2210.5ms TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-02 15:02:04,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-02 15:02:04,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 112. [2021-05-02 15:02:04,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 79 states have (on average 1.3544303797468353) internal successors, (107), 86 states have internal predecessors, (107), 24 states have call successors, (24), 9 states have call predecessors, (24), 8 states have return successors, (22), 16 states have call predecessors, (22), 22 states have call successors, (22) [2021-05-02 15:02:04,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 153 transitions. [2021-05-02 15:02:04,063 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 153 transitions. Word has length 39 [2021-05-02 15:02:04,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:02:04,064 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 153 transitions. [2021-05-02 15:02:04,064 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:02:04,064 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 153 transitions. [2021-05-02 15:02:04,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 15:02:04,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:02:04,065 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:02:04,290 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:02:04,290 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:02:04,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:02:04,291 INFO L82 PathProgramCache]: Analyzing trace with hash -174895632, now seen corresponding path program 1 times [2021-05-02 15:02:04,291 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:02:04,291 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685730587] [2021-05-02 15:02:04,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:02:04,300 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:02:04,300 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1090699065] [2021-05-02 15:02:04,300 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 15:02:04,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:02:04,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 15:02:04,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:02:04,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,452 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:02:04,452 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:02:04,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685730587] [2021-05-02 15:02:04,452 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:02:04,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090699065] [2021-05-02 15:02:04,453 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090699065] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:02:04,453 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:02:04,453 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 15:02:04,453 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119299099] [2021-05-02 15:02:04,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:02:04,453 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:02:04,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:02:04,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:02:04,454 INFO L87 Difference]: Start difference. First operand 112 states and 153 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:02:04,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:02:04,508 INFO L93 Difference]: Finished difference Result 210 states and 293 transitions. [2021-05-02 15:02:04,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 15:02:04,509 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 41 [2021-05-02 15:02:04,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:02:04,510 INFO L225 Difference]: With dead ends: 210 [2021-05-02 15:02:04,510 INFO L226 Difference]: Without dead ends: 121 [2021-05-02 15:02:04,511 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 16.0ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:02:04,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-05-02 15:02:04,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2021-05-02 15:02:04,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 85 states have (on average 1.3411764705882352) internal successors, (114), 92 states have internal predecessors, (114), 25 states have call successors, (25), 10 states have call predecessors, (25), 9 states have return successors, (23), 17 states have call predecessors, (23), 23 states have call successors, (23) [2021-05-02 15:02:04,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 162 transitions. [2021-05-02 15:02:04,527 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 162 transitions. Word has length 41 [2021-05-02 15:02:04,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:02:04,527 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 162 transitions. [2021-05-02 15:02:04,528 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:02:04,528 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 162 transitions. [2021-05-02 15:02:04,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 15:02:04,529 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:02:04,529 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:02:04,752 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:02:04,753 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:02:04,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:02:04,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1292932747, now seen corresponding path program 1 times [2021-05-02 15:02:04,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:02:04,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691987047] [2021-05-02 15:02:04,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:02:04,763 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:02:04,763 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1291606553] [2021-05-02 15:02:04,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:02:04,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:02:04,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 15:02:04,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:02:04,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:04,942 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:02:04,943 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:02:04,943 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691987047] [2021-05-02 15:02:04,943 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:02:04,943 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291606553] [2021-05-02 15:02:04,943 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1291606553] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:02:04,943 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:02:04,943 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 15:02:04,944 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346706084] [2021-05-02 15:02:04,944 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:02:04,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:02:04,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:02:04,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:02:04,945 INFO L87 Difference]: Start difference. First operand 120 states and 162 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:02:05,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:02:05,008 INFO L93 Difference]: Finished difference Result 192 states and 266 transitions. [2021-05-02 15:02:05,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 15:02:05,008 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 43 [2021-05-02 15:02:05,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:02:05,009 INFO L225 Difference]: With dead ends: 192 [2021-05-02 15:02:05,010 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 15:02:05,010 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 21.0ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:02:05,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 15:02:05,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2021-05-02 15:02:05,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 87 states have (on average 1.3333333333333333) internal successors, (116), 94 states have internal predecessors, (116), 25 states have call successors, (25), 10 states have call predecessors, (25), 9 states have return successors, (23), 17 states have call predecessors, (23), 23 states have call successors, (23) [2021-05-02 15:02:05,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 164 transitions. [2021-05-02 15:02:05,038 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 164 transitions. Word has length 43 [2021-05-02 15:02:05,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:02:05,038 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 164 transitions. [2021-05-02 15:02:05,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:02:05,038 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 164 transitions. [2021-05-02 15:02:05,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 15:02:05,039 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:02:05,040 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:02:05,260 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-05-02 15:02:05,261 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:02:05,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:02:05,261 INFO L82 PathProgramCache]: Analyzing trace with hash 1407897436, now seen corresponding path program 1 times [2021-05-02 15:02:05,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:02:05,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974695264] [2021-05-02 15:02:05,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:02:05,269 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:02:05,270 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [754882865] [2021-05-02 15:02:05,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:02:05,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:02:05,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 15:02:05,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:02:05,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:05,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:05,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:05,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:05,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:05,425 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 15:02:05,425 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:02:05,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974695264] [2021-05-02 15:02:05,425 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:02:05,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754882865] [2021-05-02 15:02:05,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754882865] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:02:05,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:02:05,426 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 15:02:05,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700557896] [2021-05-02 15:02:05,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 15:02:05,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:02:05,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 15:02:05,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:02:05,427 INFO L87 Difference]: Start difference. First operand 122 states and 164 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 15:02:05,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:02:05,485 INFO L93 Difference]: Finished difference Result 257 states and 375 transitions. [2021-05-02 15:02:05,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 15:02:05,485 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 47 [2021-05-02 15:02:05,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:02:05,487 INFO L225 Difference]: With dead ends: 257 [2021-05-02 15:02:05,487 INFO L226 Difference]: Without dead ends: 168 [2021-05-02 15:02:05,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.4ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:02:05,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-02 15:02:05,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 118. [2021-05-02 15:02:05,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 84 states have (on average 1.3333333333333333) internal successors, (112), 89 states have internal predecessors, (112), 26 states have call successors, (26), 8 states have call predecessors, (26), 7 states have return successors, (24), 20 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 15:02:05,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 162 transitions. [2021-05-02 15:02:05,502 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 162 transitions. Word has length 47 [2021-05-02 15:02:05,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:02:05,502 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 162 transitions. [2021-05-02 15:02:05,502 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 15:02:05,502 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 162 transitions. [2021-05-02 15:02:05,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 15:02:05,503 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:02:05,503 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:02:05,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:02:05,724 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:02:05,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:02:05,725 INFO L82 PathProgramCache]: Analyzing trace with hash -105484190, now seen corresponding path program 1 times [2021-05-02 15:02:05,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:02:05,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447635547] [2021-05-02 15:02:05,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:02:05,733 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:02:05,733 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [104624674] [2021-05-02 15:02:05,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 15:02:05,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:02:05,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 15:02:05,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:02:05,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:05,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:05,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:05,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:05,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:05,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:05,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:05,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:16,039 WARN L205 SmtUtils]: Spent 8.06 s on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 15:02:16,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:16,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:47,323 WARN L205 SmtUtils]: Spent 23.15 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 15:02:47,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:47,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:47,392 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 8 proven. 7 refuted. 3 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 15:02:47,392 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:02:47,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447635547] [2021-05-02 15:02:47,393 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:02:47,393 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104624674] [2021-05-02 15:02:47,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104624674] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:02:47,393 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:02:47,393 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 15:02:47,393 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857425930] [2021-05-02 15:02:47,393 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 15:02:47,393 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:02:47,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 15:02:47,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=104, Unknown=5, NotChecked=0, Total=132 [2021-05-02 15:02:47,394 INFO L87 Difference]: Start difference. First operand 118 states and 162 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 15:03:52,482 WARN L205 SmtUtils]: Spent 32.70 s on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 15:04:45,495 WARN L205 SmtUtils]: Spent 9.56 s on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 15:05:31,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:05:31,792 INFO L93 Difference]: Finished difference Result 163 states and 226 transitions. [2021-05-02 15:05:31,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 15:05:31,793 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 47 [2021-05-02 15:05:31,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:05:31,794 INFO L225 Difference]: With dead ends: 163 [2021-05-02 15:05:31,794 INFO L226 Difference]: Without dead ends: 161 [2021-05-02 15:05:31,795 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 116123.4ms TimeCoverageRelationStatistics Valid=52, Invalid=238, Unknown=16, NotChecked=0, Total=306 [2021-05-02 15:05:31,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-02 15:05:31,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 159. [2021-05-02 15:05:31,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 114 states have (on average 1.3508771929824561) internal successors, (154), 120 states have internal predecessors, (154), 35 states have call successors, (35), 10 states have call predecessors, (35), 9 states have return successors, (33), 28 states have call predecessors, (33), 33 states have call successors, (33) [2021-05-02 15:05:31,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 222 transitions. [2021-05-02 15:05:31,809 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 222 transitions. Word has length 47 [2021-05-02 15:05:31,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:05:31,809 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 222 transitions. [2021-05-02 15:05:31,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 15:05:31,809 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 222 transitions. [2021-05-02 15:05:31,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 15:05:31,810 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:05:31,810 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:05:32,031 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:05:32,032 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:05:32,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:05:32,032 INFO L82 PathProgramCache]: Analyzing trace with hash 1335036056, now seen corresponding path program 2 times [2021-05-02 15:05:32,033 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:05:32,033 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121861485] [2021-05-02 15:05:32,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:05:32,043 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:05:32,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1639964220] [2021-05-02 15:05:32,044 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 15:05:32,107 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:05:32,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:05:32,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 15:05:32,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:05:32,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:32,611 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 15:05:32,611 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:05:32,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121861485] [2021-05-02 15:05:32,611 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:05:32,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639964220] [2021-05-02 15:05:32,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639964220] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:05:32,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:05:32,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 15:05:32,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348119435] [2021-05-02 15:05:32,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 15:05:32,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:05:32,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 15:05:32,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-05-02 15:05:32,615 INFO L87 Difference]: Start difference. First operand 159 states and 222 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 15:05:55,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:05:55,222 INFO L93 Difference]: Finished difference Result 381 states and 570 transitions. [2021-05-02 15:05:55,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 15:05:55,223 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), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 47 [2021-05-02 15:05:55,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:05:55,226 INFO L225 Difference]: With dead ends: 381 [2021-05-02 15:05:55,226 INFO L226 Difference]: Without dead ends: 379 [2021-05-02 15:05:55,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 301.9ms TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-02 15:05:55,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2021-05-02 15:05:55,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 334. [2021-05-02 15:05:55,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 245 states have (on average 1.420408163265306) internal successors, (348), 256 states have internal predecessors, (348), 76 states have call successors, (76), 13 states have call predecessors, (76), 12 states have return successors, (74), 64 states have call predecessors, (74), 74 states have call successors, (74) [2021-05-02 15:05:55,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 498 transitions. [2021-05-02 15:05:55,260 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 498 transitions. Word has length 47 [2021-05-02 15:05:55,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:05:55,260 INFO L480 AbstractCegarLoop]: Abstraction has 334 states and 498 transitions. [2021-05-02 15:05:55,260 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), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 15:05:55,260 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 498 transitions. [2021-05-02 15:05:55,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 15:05:55,261 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:05:55,261 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:05:55,478 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 15:05:55,478 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:05:55,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:05:55,478 INFO L82 PathProgramCache]: Analyzing trace with hash 1915058849, now seen corresponding path program 1 times [2021-05-02 15:05:55,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:05:55,479 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240256631] [2021-05-02 15:05:55,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:05:55,485 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:05:55,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1074905504] [2021-05-02 15:05:55,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:05:55,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:05:55,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 15:05:55,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:05:55,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:55,684 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:05:55,684 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:05:55,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240256631] [2021-05-02 15:05:55,684 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:05:55,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074905504] [2021-05-02 15:05:55,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1074905504] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:05:55,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:05:55,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 15:05:55,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586580020] [2021-05-02 15:05:55,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 15:05:55,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:05:55,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 15:05:55,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:05:55,687 INFO L87 Difference]: Start difference. First operand 334 states and 498 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 15:05:55,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:05:55,779 INFO L93 Difference]: Finished difference Result 616 states and 935 transitions. [2021-05-02 15:05:55,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:05:55,780 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 49 [2021-05-02 15:05:55,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:05:55,782 INFO L225 Difference]: With dead ends: 616 [2021-05-02 15:05:55,782 INFO L226 Difference]: Without dead ends: 334 [2021-05-02 15:05:55,785 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 31.9ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:05:55,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2021-05-02 15:05:55,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 333. [2021-05-02 15:05:55,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 245 states have (on average 1.4122448979591837) internal successors, (346), 255 states have internal predecessors, (346), 75 states have call successors, (75), 13 states have call predecessors, (75), 12 states have return successors, (73), 64 states have call predecessors, (73), 73 states have call successors, (73) [2021-05-02 15:05:55,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 494 transitions. [2021-05-02 15:05:55,821 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 494 transitions. Word has length 49 [2021-05-02 15:05:55,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:05:55,822 INFO L480 AbstractCegarLoop]: Abstraction has 333 states and 494 transitions. [2021-05-02 15:05:55,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 15:05:55,822 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 494 transitions. [2021-05-02 15:05:55,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 15:05:55,823 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:05:55,823 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:05:56,045 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:05:56,045 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:05:56,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:05:56,046 INFO L82 PathProgramCache]: Analyzing trace with hash 44415257, now seen corresponding path program 1 times [2021-05-02 15:05:56,046 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:05:56,046 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009369582] [2021-05-02 15:05:56,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:05:56,059 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:05:56,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2044571884] [2021-05-02 15:05:56,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:05:56,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:05:56,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 15:05:56,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:05:56,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,179 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,244 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 20 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:05:56,245 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:05:56,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009369582] [2021-05-02 15:05:56,245 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:05:56,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044571884] [2021-05-02 15:05:56,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044571884] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:05:56,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:05:56,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 15:05:56,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511800375] [2021-05-02 15:05:56,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 15:05:56,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:05:56,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 15:05:56,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:05:56,248 INFO L87 Difference]: Start difference. First operand 333 states and 494 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 15:05:56,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:05:56,344 INFO L93 Difference]: Finished difference Result 451 states and 670 transitions. [2021-05-02 15:05:56,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:05:56,345 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 49 [2021-05-02 15:05:56,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:05:56,347 INFO L225 Difference]: With dead ends: 451 [2021-05-02 15:05:56,347 INFO L226 Difference]: Without dead ends: 335 [2021-05-02 15:05:56,348 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 38.8ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:05:56,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2021-05-02 15:05:56,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 335. [2021-05-02 15:05:56,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 247 states have (on average 1.408906882591093) internal successors, (348), 257 states have internal predecessors, (348), 75 states have call successors, (75), 13 states have call predecessors, (75), 12 states have return successors, (73), 64 states have call predecessors, (73), 73 states have call successors, (73) [2021-05-02 15:05:56,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 496 transitions. [2021-05-02 15:05:56,377 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 496 transitions. Word has length 49 [2021-05-02 15:05:56,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:05:56,378 INFO L480 AbstractCegarLoop]: Abstraction has 335 states and 496 transitions. [2021-05-02 15:05:56,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 15:05:56,378 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 496 transitions. [2021-05-02 15:05:56,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 15:05:56,378 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:05:56,378 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:05:56,599 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 15:05:56,599 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:05:56,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:05:56,600 INFO L82 PathProgramCache]: Analyzing trace with hash -1067781299, now seen corresponding path program 1 times [2021-05-02 15:05:56,600 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:05:56,600 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656080648] [2021-05-02 15:05:56,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:05:56,608 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:05:56,608 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2038103733] [2021-05-02 15:05:56,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:05:56,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:05:56,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 15:05:56,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:05:56,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:56,811 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:05:56,812 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:05:56,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656080648] [2021-05-02 15:05:56,812 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:05:56,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038103733] [2021-05-02 15:05:56,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038103733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:05:56,812 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:05:56,812 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:05:56,812 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705193609] [2021-05-02 15:05:56,812 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:05:56,812 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:05:56,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:05:56,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:05:56,813 INFO L87 Difference]: Start difference. First operand 335 states and 496 transitions. Second operand has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 15:05:56,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:05:56,904 INFO L93 Difference]: Finished difference Result 360 states and 523 transitions. [2021-05-02 15:05:56,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:05:56,905 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 55 [2021-05-02 15:05:56,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:05:56,909 INFO L225 Difference]: With dead ends: 360 [2021-05-02 15:05:56,909 INFO L226 Difference]: Without dead ends: 353 [2021-05-02 15:05:56,910 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 34.4ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:05:56,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-05-02 15:05:56,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 348. [2021-05-02 15:05:56,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 348 states, 256 states have (on average 1.39453125) internal successors, (357), 267 states have internal predecessors, (357), 77 states have call successors, (77), 15 states have call predecessors, (77), 14 states have return successors, (75), 65 states have call predecessors, (75), 75 states have call successors, (75) [2021-05-02 15:05:56,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 509 transitions. [2021-05-02 15:05:56,936 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 509 transitions. Word has length 55 [2021-05-02 15:05:56,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:05:56,936 INFO L480 AbstractCegarLoop]: Abstraction has 348 states and 509 transitions. [2021-05-02 15:05:56,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 15:05:56,936 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 509 transitions. [2021-05-02 15:05:56,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 15:05:56,937 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:05:56,937 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:05:57,158 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:05:57,158 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:05:57,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:05:57,159 INFO L82 PathProgramCache]: Analyzing trace with hash 1713804371, now seen corresponding path program 2 times [2021-05-02 15:05:57,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:05:57,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378287104] [2021-05-02 15:05:57,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:05:57,165 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:05:57,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2059224088] [2021-05-02 15:05:57,165 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:05:57,323 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:05:57,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:05:57,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 15:05:57,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:05:57,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:57,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:57,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:05:57,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:07,522 WARN L205 SmtUtils]: Spent 8.05 s on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 15:06:07,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:07,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:07,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:07,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:22,606 WARN L205 SmtUtils]: Spent 6.04 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 15:06:22,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:22,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:07:02,383 WARN L205 SmtUtils]: Spent 19.71 s on a formula simplification that was a NOOP. DAG size: 36 [2021-05-02 15:07:02,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:07:02,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:07:02,621 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 12 proven. 15 refuted. 6 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 15:07:02,621 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:07:02,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378287104] [2021-05-02 15:07:02,621 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:07:02,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059224088] [2021-05-02 15:07:02,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059224088] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:07:02,621 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:07:02,621 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 15:07:02,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341763993] [2021-05-02 15:07:02,622 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 15:07:02,622 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:07:02,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 15:07:02,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=124, Unknown=7, NotChecked=0, Total=156 [2021-05-02 15:07:02,622 INFO L87 Difference]: Start difference. First operand 348 states and 509 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 15:08:29,979 WARN L205 SmtUtils]: Spent 14.25 s on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 15:09:35,733 WARN L205 SmtUtils]: Spent 13.76 s on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 15:11:14,771 WARN L205 SmtUtils]: Spent 6.06 s on a formula simplification that was a NOOP. DAG size: 42 [2021-05-02 15:14:52,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:14:52,347 INFO L93 Difference]: Finished difference Result 396 states and 577 transitions. [2021-05-02 15:14:52,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 15:14:52,348 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 5 states have call successors, (7) Word has length 55 [2021-05-02 15:14:52,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:14:52,350 INFO L225 Difference]: With dead ends: 396 [2021-05-02 15:14:52,350 INFO L226 Difference]: Without dead ends: 394 [2021-05-02 15:14:52,350 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 157244.3ms TimeCoverageRelationStatistics Valid=58, Invalid=296, Unknown=26, NotChecked=0, Total=380 [2021-05-02 15:14:52,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2021-05-02 15:14:52,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 391. [2021-05-02 15:14:52,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 288 states have (on average 1.3958333333333333) internal successors, (402), 300 states have internal predecessors, (402), 86 states have call successors, (86), 17 states have call predecessors, (86), 16 states have return successors, (84), 73 states have call predecessors, (84), 84 states have call successors, (84) [2021-05-02 15:14:52,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 572 transitions. [2021-05-02 15:14:52,396 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 572 transitions. Word has length 55 [2021-05-02 15:14:52,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:14:52,396 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 572 transitions. [2021-05-02 15:14:52,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 15:14:52,396 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 572 transitions. [2021-05-02 15:14:52,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 15:14:52,397 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:14:52,397 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:14:52,612 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 15:14:52,613 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:14:52,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:14:52,613 INFO L82 PathProgramCache]: Analyzing trace with hash 181776133, now seen corresponding path program 1 times [2021-05-02 15:14:52,613 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:14:52,613 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005194278] [2021-05-02 15:14:52,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:14:52,619 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:14:52,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [653827455] [2021-05-02 15:14:52,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 15:14:52,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:14:52,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 15:14:52,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:14:52,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:52,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:52,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:52,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:52,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:52,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:52,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:52,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:52,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:52,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:52,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:52,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:52,803 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 15:14:52,803 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:14:52,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005194278] [2021-05-02 15:14:52,803 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:14:52,804 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [653827455] [2021-05-02 15:14:52,804 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [653827455] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:14:52,804 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:14:52,804 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2021-05-02 15:14:52,804 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403185791] [2021-05-02 15:14:52,804 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 15:14:52,804 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:14:52,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 15:14:52,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:14:52,805 INFO L87 Difference]: Start difference. First operand 391 states and 572 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 15:14:52,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:14:52,896 INFO L93 Difference]: Finished difference Result 735 states and 1114 transitions. [2021-05-02 15:14:52,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 15:14:52,897 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 55 [2021-05-02 15:14:52,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:14:52,900 INFO L225 Difference]: With dead ends: 735 [2021-05-02 15:14:52,900 INFO L226 Difference]: Without dead ends: 533 [2021-05-02 15:14:52,901 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:14:52,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2021-05-02 15:14:52,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 510. [2021-05-02 15:14:52,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 510 states, 381 states have (on average 1.3832020997375327) internal successors, (527), 390 states have internal predecessors, (527), 112 states have call successors, (112), 17 states have call predecessors, (112), 16 states have return successors, (109), 102 states have call predecessors, (109), 109 states have call successors, (109) [2021-05-02 15:14:52,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 510 states to 510 states and 748 transitions. [2021-05-02 15:14:52,940 INFO L78 Accepts]: Start accepts. Automaton has 510 states and 748 transitions. Word has length 55 [2021-05-02 15:14:52,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:14:52,940 INFO L480 AbstractCegarLoop]: Abstraction has 510 states and 748 transitions. [2021-05-02 15:14:52,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 15:14:52,940 INFO L276 IsEmpty]: Start isEmpty. Operand 510 states and 748 transitions. [2021-05-02 15:14:52,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 15:14:52,941 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:14:52,941 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:14:53,163 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 15:14:53,164 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:14:53,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:14:53,164 INFO L82 PathProgramCache]: Analyzing trace with hash 1622296379, now seen corresponding path program 3 times [2021-05-02 15:14:53,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:14:53,164 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145805765] [2021-05-02 15:14:53,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:14:53,172 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:14:53,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [346750242] [2021-05-02 15:14:53,172 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:14:53,285 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 15:14:53,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:14:53,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 15:14:53,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:14:53,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:53,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:53,423 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-05-02 15:14:53,443 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:14:53,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145805765] [2021-05-02 15:14:53,443 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:14:53,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346750242] [2021-05-02 15:14:53,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346750242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:14:53,443 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:14:53,443 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 15:14:53,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886882513] [2021-05-02 15:14:53,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 15:14:53,444 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:14:53,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 15:14:53,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:14:53,444 INFO L87 Difference]: Start difference. First operand 510 states and 748 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2021-05-02 15:14:57,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:14:57,606 INFO L93 Difference]: Finished difference Result 523 states and 764 transitions. [2021-05-02 15:14:57,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 15:14:57,607 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) Word has length 55 [2021-05-02 15:14:57,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:14:57,609 INFO L225 Difference]: With dead ends: 523 [2021-05-02 15:14:57,610 INFO L226 Difference]: Without dead ends: 520 [2021-05-02 15:14:57,610 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 59.7ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:14:57,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2021-05-02 15:14:57,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 509. [2021-05-02 15:14:57,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 509 states, 380 states have (on average 1.3789473684210527) internal successors, (524), 390 states have internal predecessors, (524), 111 states have call successors, (111), 18 states have call predecessors, (111), 17 states have return successors, (109), 100 states have call predecessors, (109), 109 states have call successors, (109) [2021-05-02 15:14:57,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 509 states to 509 states and 744 transitions. [2021-05-02 15:14:57,651 INFO L78 Accepts]: Start accepts. Automaton has 509 states and 744 transitions. Word has length 55 [2021-05-02 15:14:57,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:14:57,652 INFO L480 AbstractCegarLoop]: Abstraction has 509 states and 744 transitions. [2021-05-02 15:14:57,652 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2021-05-02 15:14:57,652 INFO L276 IsEmpty]: Start isEmpty. Operand 509 states and 744 transitions. [2021-05-02 15:14:57,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 15:14:57,652 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:14:57,653 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:14:57,856 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 15:14:57,856 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:14:57,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:14:57,856 INFO L82 PathProgramCache]: Analyzing trace with hash -2095290798, now seen corresponding path program 2 times [2021-05-02 15:14:57,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:14:57,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557580309] [2021-05-02 15:14:57,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:14:57,863 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:14:57,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [273775600] [2021-05-02 15:14:57,864 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:14:57,915 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:14:57,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:14:57,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 15:14:57,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:14:57,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:57,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:57,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:57,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:57,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:57,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:57,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:57,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:57,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,105 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 32 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:14:58,105 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:14:58,105 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557580309] [2021-05-02 15:14:58,105 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:14:58,105 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273775600] [2021-05-02 15:14:58,105 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273775600] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:14:58,105 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:14:58,106 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:14:58,107 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904587046] [2021-05-02 15:14:58,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:14:58,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:14:58,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:14:58,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:14:58,108 INFO L87 Difference]: Start difference. First operand 509 states and 744 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 15:14:58,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:14:58,270 INFO L93 Difference]: Finished difference Result 865 states and 1284 transitions. [2021-05-02 15:14:58,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 15:14:58,271 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 57 [2021-05-02 15:14:58,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:14:58,273 INFO L225 Difference]: With dead ends: 865 [2021-05-02 15:14:58,273 INFO L226 Difference]: Without dead ends: 486 [2021-05-02 15:14:58,275 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 59.0ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:14:58,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2021-05-02 15:14:58,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 457. [2021-05-02 15:14:58,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 342 states have (on average 1.371345029239766) internal successors, (469), 350 states have internal predecessors, (469), 98 states have call successors, (98), 17 states have call predecessors, (98), 16 states have return successors, (96), 89 states have call predecessors, (96), 96 states have call successors, (96) [2021-05-02 15:14:58,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 663 transitions. [2021-05-02 15:14:58,313 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 663 transitions. Word has length 57 [2021-05-02 15:14:58,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:14:58,314 INFO L480 AbstractCegarLoop]: Abstraction has 457 states and 663 transitions. [2021-05-02 15:14:58,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 15:14:58,314 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 663 transitions. [2021-05-02 15:14:58,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 15:14:58,314 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:14:58,314 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:14:58,528 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 15:14:58,529 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:14:58,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:14:58,529 INFO L82 PathProgramCache]: Analyzing trace with hash -659642693, now seen corresponding path program 2 times [2021-05-02 15:14:58,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:14:58,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019521908] [2021-05-02 15:14:58,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:14:58,533 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:14:58,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2013417099] [2021-05-02 15:14:58,533 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 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 15:14:58,582 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:14:58,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:14:58,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 15:14:58,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:14:58,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:58,761 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:14:58,762 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:14:58,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019521908] [2021-05-02 15:14:58,762 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:14:58,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013417099] [2021-05-02 15:14:58,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2013417099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:14:58,762 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:14:58,762 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:14:58,762 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489921296] [2021-05-02 15:14:58,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:14:58,763 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:14:58,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:14:58,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:14:58,763 INFO L87 Difference]: Start difference. First operand 457 states and 663 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 15:14:58,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:14:58,908 INFO L93 Difference]: Finished difference Result 597 states and 874 transitions. [2021-05-02 15:14:58,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:14:58,909 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 59 [2021-05-02 15:14:58,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:14:58,911 INFO L225 Difference]: With dead ends: 597 [2021-05-02 15:14:58,911 INFO L226 Difference]: Without dead ends: 459 [2021-05-02 15:14:58,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 72.2ms TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:14:58,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2021-05-02 15:14:58,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 459. [2021-05-02 15:14:58,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 344 states have (on average 1.369186046511628) internal successors, (471), 352 states have internal predecessors, (471), 98 states have call successors, (98), 17 states have call predecessors, (98), 16 states have return successors, (96), 89 states have call predecessors, (96), 96 states have call successors, (96) [2021-05-02 15:14:58,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 665 transitions. [2021-05-02 15:14:58,946 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 665 transitions. Word has length 59 [2021-05-02 15:14:58,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:14:58,947 INFO L480 AbstractCegarLoop]: Abstraction has 459 states and 665 transitions. [2021-05-02 15:14:58,947 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 15:14:58,947 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 665 transitions. [2021-05-02 15:14:58,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 15:14:58,948 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:14:58,948 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:14:59,168 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:14:59,169 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:14:59,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:14:59,169 INFO L82 PathProgramCache]: Analyzing trace with hash 710967711, now seen corresponding path program 1 times [2021-05-02 15:14:59,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:14:59,169 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342124246] [2021-05-02 15:14:59,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:14:59,189 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:14:59,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [294138441] [2021-05-02 15:14:59,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 15:14:59,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:14:59,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 15:14:59,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:14:59,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:14:59,858 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 25 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-05-02 15:14:59,858 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:14:59,858 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342124246] [2021-05-02 15:14:59,858 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:14:59,858 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294138441] [2021-05-02 15:14:59,858 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294138441] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:14:59,858 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:14:59,858 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 15:14:59,858 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934049390] [2021-05-02 15:14:59,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 15:14:59,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:14:59,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 15:14:59,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:14:59,859 INFO L87 Difference]: Start difference. First operand 459 states and 665 transitions. Second operand has 12 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 15:15:06,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:15:06,869 INFO L93 Difference]: Finished difference Result 588 states and 820 transitions. [2021-05-02 15:15:06,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 15:15:06,870 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 61 [2021-05-02 15:15:06,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:15:06,872 INFO L225 Difference]: With dead ends: 588 [2021-05-02 15:15:06,872 INFO L226 Difference]: Without dead ends: 476 [2021-05-02 15:15:06,873 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 374.1ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-02 15:15:06,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2021-05-02 15:15:06,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 447. [2021-05-02 15:15:06,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 331 states have (on average 1.3353474320241692) internal successors, (442), 351 states have internal predecessors, (442), 94 states have call successors, (94), 22 states have call predecessors, (94), 21 states have return successors, (92), 73 states have call predecessors, (92), 92 states have call successors, (92) [2021-05-02 15:15:06,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 628 transitions. [2021-05-02 15:15:06,908 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 628 transitions. Word has length 61 [2021-05-02 15:15:06,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:15:06,908 INFO L480 AbstractCegarLoop]: Abstraction has 447 states and 628 transitions. [2021-05-02 15:15:06,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 15:15:06,908 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 628 transitions. [2021-05-02 15:15:06,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 15:15:06,909 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:15:06,909 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:15:07,130 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:15:07,131 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:15:07,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:15:07,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1402694082, now seen corresponding path program 2 times [2021-05-02 15:15:07,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:15:07,131 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311760973] [2021-05-02 15:15:07,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:15:07,140 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:15:07,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2090266332] [2021-05-02 15:15:07,141 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 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 15:15:07,203 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:15:07,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:15:07,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 15:15:07,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:15:07,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:07,398 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 10 proven. 54 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:15:07,398 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:15:07,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311760973] [2021-05-02 15:15:07,398 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:15:07,399 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090266332] [2021-05-02 15:15:07,399 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2090266332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:15:07,399 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:15:07,399 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 15:15:07,399 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016347917] [2021-05-02 15:15:07,399 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:15:07,399 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:15:07,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:15:07,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:15:07,400 INFO L87 Difference]: Start difference. First operand 447 states and 628 transitions. Second operand has 9 states, 9 states have (on average 4.666666666666667) internal successors, (42), 8 states have internal predecessors, (42), 8 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) [2021-05-02 15:15:07,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:15:07,567 INFO L93 Difference]: Finished difference Result 485 states and 667 transitions. [2021-05-02 15:15:07,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:15:07,568 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.666666666666667) internal successors, (42), 8 states have internal predecessors, (42), 8 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) Word has length 63 [2021-05-02 15:15:07,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:15:07,571 INFO L225 Difference]: With dead ends: 485 [2021-05-02 15:15:07,571 INFO L226 Difference]: Without dead ends: 478 [2021-05-02 15:15:07,571 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 66.6ms TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:15:07,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2021-05-02 15:15:07,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 462. [2021-05-02 15:15:07,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 341 states have (on average 1.3255131964809383) internal successors, (452), 362 states have internal predecessors, (452), 96 states have call successors, (96), 25 states have call predecessors, (96), 24 states have return successors, (94), 74 states have call predecessors, (94), 94 states have call successors, (94) [2021-05-02 15:15:07,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 642 transitions. [2021-05-02 15:15:07,607 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 642 transitions. Word has length 63 [2021-05-02 15:15:07,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:15:07,608 INFO L480 AbstractCegarLoop]: Abstraction has 462 states and 642 transitions. [2021-05-02 15:15:07,608 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.666666666666667) internal successors, (42), 8 states have internal predecessors, (42), 8 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) [2021-05-02 15:15:07,608 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 642 transitions. [2021-05-02 15:15:07,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 15:15:07,609 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:15:07,609 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:15:07,824 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 15:15:07,825 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:15:07,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:15:07,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1378891588, now seen corresponding path program 3 times [2021-05-02 15:15:07,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:15:07,825 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1899536603] [2021-05-02 15:15:07,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:15:07,833 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:15:07,834 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [737569376] [2021-05-02 15:15:07,834 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 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 15:15:07,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 15:15:07,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:15:07,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 15:15:07,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:15:08,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:08,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:08,127 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 32 proven. 1 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 15:15:08,128 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:15:08,128 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1899536603] [2021-05-02 15:15:08,128 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:15:08,128 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737569376] [2021-05-02 15:15:08,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737569376] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:15:08,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:15:08,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:15:08,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743843748] [2021-05-02 15:15:08,129 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:15:08,129 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:15:08,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:15:08,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:15:08,129 INFO L87 Difference]: Start difference. First operand 462 states and 642 transitions. Second operand has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-02 15:15:10,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:15:10,317 INFO L93 Difference]: Finished difference Result 477 states and 654 transitions. [2021-05-02 15:15:10,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:15:10,320 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) Word has length 63 [2021-05-02 15:15:10,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:15:10,322 INFO L225 Difference]: With dead ends: 477 [2021-05-02 15:15:10,322 INFO L226 Difference]: Without dead ends: 475 [2021-05-02 15:15:10,322 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 71.0ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:15:10,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2021-05-02 15:15:10,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 459. [2021-05-02 15:15:10,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 339 states have (on average 1.3185840707964602) internal successors, (447), 359 states have internal predecessors, (447), 93 states have call successors, (93), 27 states have call predecessors, (93), 26 states have return successors, (91), 72 states have call predecessors, (91), 91 states have call successors, (91) [2021-05-02 15:15:10,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 631 transitions. [2021-05-02 15:15:10,356 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 631 transitions. Word has length 63 [2021-05-02 15:15:10,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:15:10,356 INFO L480 AbstractCegarLoop]: Abstraction has 459 states and 631 transitions. [2021-05-02 15:15:10,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-02 15:15:10,356 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 631 transitions. [2021-05-02 15:15:10,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 15:15:10,357 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:15:10,357 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:15:10,559 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:15:10,560 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:15:10,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:15:10,560 INFO L82 PathProgramCache]: Analyzing trace with hash -2023122264, now seen corresponding path program 2 times [2021-05-02 15:15:10,560 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:15:10,560 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [284253903] [2021-05-02 15:15:10,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:15:10,565 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:15:10,565 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [448754030] [2021-05-02 15:15:10,565 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 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 15:15:10,690 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:15:10,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:15:10,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 15:15:10,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:15:10,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:10,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:10,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:10,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:10,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:10,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:25,152 WARN L205 SmtUtils]: Spent 11.92 s on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 15:15:25,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:25,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:29,543 WARN L205 SmtUtils]: Spent 4.12 s on a formula simplification that was a NOOP. DAG size: 27 [2021-05-02 15:15:29,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:29,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:40,817 WARN L205 SmtUtils]: Spent 6.71 s on a formula simplification that was a NOOP. DAG size: 24 [2021-05-02 15:15:40,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:40,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:40,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:40,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:15:49,393 WARN L205 SmtUtils]: Spent 4.46 s on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 15:16:10,926 WARN L205 SmtUtils]: Spent 10.70 s on a formula simplification that was a NOOP. DAG size: 36 [2021-05-02 15:16:10,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:10,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:16:11,423 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 17 proven. 26 refuted. 3 times theorem prover too weak. 23 trivial. 0 not checked. [2021-05-02 15:16:11,424 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:16:11,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [284253903] [2021-05-02 15:16:11,424 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:16:11,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [448754030] [2021-05-02 15:16:11,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [448754030] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:16:11,424 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:16:11,424 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 15:16:11,424 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873701465] [2021-05-02 15:16:11,424 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 15:16:11,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:16:11,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 15:16:11,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=168, Unknown=9, NotChecked=0, Total=210 [2021-05-02 15:16:11,425 INFO L87 Difference]: Start difference. First operand 459 states and 631 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 12 states have internal predecessors, (36), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8)