/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/loop-acceleration/simple_4-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:19:15,714 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:19:15,715 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:19:15,742 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:19:15,762 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:19:15,764 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:19:15,765 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:19:15,767 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:19:15,767 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:19:15,768 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:19:15,771 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:19:15,786 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:19:15,787 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:19:15,787 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:19:15,788 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:19:15,788 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:19:15,790 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:19:15,794 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:19:15,795 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:19:15,795 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:19:15,796 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 12:19:15,811 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:19:15,811 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:19:15,812 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:19:15,812 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:19:15,812 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:19:15,812 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:19:15,812 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:19:15,812 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:19:15,812 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:19:15,813 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:19:15,813 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:19:15,813 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:19:15,813 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:19:15,813 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:19:15,813 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:19:15,813 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:19:15,813 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:19:15,813 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:19:15,813 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:19:15,814 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:19:15,814 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:19:15,814 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:19:15,814 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:19:15,814 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:19:15,814 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:19:15,814 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:19:15,814 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:19:15,814 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:19:15,814 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:19:16,047 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:19:16,061 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:19:16,062 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:19:16,063 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:19:16,064 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:19:16,064 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-1.c [2021-05-02 12:19:16,120 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/084c95d49/9628ee7c034248dfb6d5bf542675dd9e/FLAGbb731c0e0 [2021-05-02 12:19:16,438 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:19:16,440 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-1.c [2021-05-02 12:19:16,444 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/084c95d49/9628ee7c034248dfb6d5bf542675dd9e/FLAGbb731c0e0 [2021-05-02 12:19:16,852 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/084c95d49/9628ee7c034248dfb6d5bf542675dd9e [2021-05-02 12:19:16,854 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:19:16,855 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:19:16,856 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:19:16,856 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:19:16,860 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:19:16,861 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:19:16" (1/1) ... [2021-05-02 12:19:16,862 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68dfbd76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:16, skipping insertion in model container [2021-05-02 12:19:16,862 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:19:16" (1/1) ... [2021-05-02 12:19:16,867 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:19:16,876 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:19:16,961 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-1.c[322,335] [2021-05-02 12:19:16,966 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:19:16,971 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:19:16,979 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-1.c[322,335] [2021-05-02 12:19:16,980 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:19:17,009 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:19:17,012 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:17 WrapperNode [2021-05-02 12:19:17,012 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:19:17,016 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:19:17,016 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:19:17,017 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:19:17,023 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:17" (1/1) ... [2021-05-02 12:19:17,023 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:17" (1/1) ... [2021-05-02 12:19:17,027 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:17" (1/1) ... [2021-05-02 12:19:17,027 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:17" (1/1) ... [2021-05-02 12:19:17,031 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:17" (1/1) ... [2021-05-02 12:19:17,035 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:17" (1/1) ... [2021-05-02 12:19:17,039 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:17" (1/1) ... [2021-05-02 12:19:17,042 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:19:17,043 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:19:17,043 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:19:17,043 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:19:17,044 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:17" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:19:17,101 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:19:17,101 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:19:17,101 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:19:17,101 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:19:17,102 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:19:17,102 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:19:17,102 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:19:17,103 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:19:17,103 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:19:17,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:19:17,103 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:19:17,103 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:19:17,104 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:19:17,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:19:17,105 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:19:17,105 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:19:17,105 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:19:17,327 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:19:17,328 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 12:19:17,329 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:19:17 BoogieIcfgContainer [2021-05-02 12:19:17,329 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:19:17,330 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:19:17,330 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:19:17,332 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:19:17,332 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:19:16" (1/3) ... [2021-05-02 12:19:17,332 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26ab9e16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:19:17, skipping insertion in model container [2021-05-02 12:19:17,332 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:17" (2/3) ... [2021-05-02 12:19:17,332 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26ab9e16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:19:17, skipping insertion in model container [2021-05-02 12:19:17,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:19:17" (3/3) ... [2021-05-02 12:19:17,333 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_4-1.c [2021-05-02 12:19:17,343 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:19:17,351 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:19:17,361 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:19:17,384 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:19:17,385 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:19:17,385 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:19:17,385 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:19:17,385 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:19:17,385 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:19:17,385 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:19:17,385 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:19:17,398 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:19:17,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:19:17,401 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:17,401 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:17,402 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:17,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:17,406 INFO L82 PathProgramCache]: Analyzing trace with hash -219174432, now seen corresponding path program 1 times [2021-05-02 12:19:17,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:17,412 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196155219] [2021-05-02 12:19:17,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:17,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:17,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:17,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:17,641 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:17,641 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:17,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196155219] [2021-05-02 12:19:17,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [196155219] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:19:17,643 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:19:17,643 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 12:19:17,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424824974] [2021-05-02 12:19:17,646 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:19:17,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:17,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:19:17,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:19:17,657 INFO L87 Difference]: Start difference. First operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:17,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:17,712 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2021-05-02 12:19:17,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:19:17,714 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 12:19:17,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:17,719 INFO L225 Difference]: With dead ends: 29 [2021-05-02 12:19:17,720 INFO L226 Difference]: Without dead ends: 12 [2021-05-02 12:19:17,722 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 67.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:19:17,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-05-02 12:19:17,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-05-02 12:19:17,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:17,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2021-05-02 12:19:17,748 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 11 [2021-05-02 12:19:17,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:17,749 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2021-05-02 12:19:17,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:17,750 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2021-05-02 12:19:17,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:19:17,750 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:17,751 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:17,752 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:19:17,752 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:17,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:17,752 INFO L82 PathProgramCache]: Analyzing trace with hash -222868516, now seen corresponding path program 1 times [2021-05-02 12:19:17,752 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:17,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579003444] [2021-05-02 12:19:17,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:17,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:17,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:17,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:17,845 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:17,846 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:17,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579003444] [2021-05-02 12:19:17,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579003444] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:19:17,846 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:19:17,846 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:19:17,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217143785] [2021-05-02 12:19:17,847 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:19:17,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:17,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:19:17,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:19:17,848 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:17,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:17,909 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2021-05-02 12:19:17,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:19:17,910 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 12:19:17,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:17,910 INFO L225 Difference]: With dead ends: 18 [2021-05-02 12:19:17,911 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 12:19:17,911 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 78.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:19:17,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 12:19:17,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 12:19:17,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:17,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2021-05-02 12:19:17,915 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2021-05-02 12:19:17,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:17,915 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2021-05-02 12:19:17,915 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:17,915 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2021-05-02 12:19:17,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 12:19:17,915 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:17,916 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:17,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:19:17,916 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:17,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:17,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1717471862, now seen corresponding path program 1 times [2021-05-02 12:19:17,916 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:17,916 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252710167] [2021-05-02 12:19:17,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:17,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:18,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:18,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:18,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:18,035 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:18,035 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252710167] [2021-05-02 12:19:18,035 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252710167] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:18,035 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759778000] [2021-05-02 12:19:18,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:18,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:18,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:19:18,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:18,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:18,218 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759778000] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:18,218 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:18,218 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 12:19:18,218 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593955952] [2021-05-02 12:19:18,219 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:19:18,219 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:18,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:19:18,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:19:18,219 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:18,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:18,281 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2021-05-02 12:19:18,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:19:18,282 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 12:19:18,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:18,282 INFO L225 Difference]: With dead ends: 19 [2021-05-02 12:19:18,282 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 12:19:18,283 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 101.2ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:19:18,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 12:19:18,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 12:19:18,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:18,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2021-05-02 12:19:18,286 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2021-05-02 12:19:18,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:18,286 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2021-05-02 12:19:18,286 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:18,287 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2021-05-02 12:19:18,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 12:19:18,287 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:18,287 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:18,489 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 12:19:18,489 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:18,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:18,490 INFO L82 PathProgramCache]: Analyzing trace with hash 1738481436, now seen corresponding path program 2 times [2021-05-02 12:19:18,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:18,490 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061211543] [2021-05-02 12:19:18,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:18,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:18,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:18,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:18,598 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:18,598 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:18,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061211543] [2021-05-02 12:19:18,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061211543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:18,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712299746] [2021-05-02 12:19:18,598 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:18,647 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:18,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:18,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:19:18,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:18,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,696 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:18,697 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712299746] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:18,697 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:18,697 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:19:18,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342132305] [2021-05-02 12:19:18,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:19:18,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:18,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:19:18,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:19:18,698 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:18,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:18,801 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2021-05-02 12:19:18,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:19:18,801 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 12:19:18,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:18,802 INFO L225 Difference]: With dead ends: 20 [2021-05-02 12:19:18,802 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 12:19:18,803 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 136.8ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:19:18,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 12:19:18,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 12:19:18,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:18,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2021-05-02 12:19:18,810 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2021-05-02 12:19:18,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:18,810 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2021-05-02 12:19:18,810 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:18,810 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2021-05-02 12:19:18,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:19:18,811 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:18,811 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:19,015 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:19,017 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:19,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:19,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1905189066, now seen corresponding path program 3 times [2021-05-02 12:19:19,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:19,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389861496] [2021-05-02 12:19:19,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:19,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:19,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:19,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:19,130 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:19,131 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:19,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389861496] [2021-05-02 12:19:19,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1389861496] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:19,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1452361710] [2021-05-02 12:19:19,131 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:19,213 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 12:19:19,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:19,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 12:19:19,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:19,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:19,261 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:19,261 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1452361710] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:19,261 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:19,261 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:19:19,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249247450] [2021-05-02 12:19:19,262 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:19:19,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:19,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:19:19,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:19:19,262 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:19,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:19,371 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2021-05-02 12:19:19,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:19:19,371 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 12:19:19,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:19,372 INFO L225 Difference]: With dead ends: 21 [2021-05-02 12:19:19,372 INFO L226 Difference]: Without dead ends: 16 [2021-05-02 12:19:19,373 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 120.2ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:19:19,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-02 12:19:19,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-02 12:19:19,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:19,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2021-05-02 12:19:19,383 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2021-05-02 12:19:19,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:19,383 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2021-05-02 12:19:19,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:19,383 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2021-05-02 12:19:19,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 12:19:19,384 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:19,384 INFO L523 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:19,586 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:19,587 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:19,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:19,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1105142364, now seen corresponding path program 4 times [2021-05-02 12:19:19,587 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:19,587 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1064364923] [2021-05-02 12:19:19,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:19,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:19,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:19,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:19,718 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:19,718 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:19,718 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1064364923] [2021-05-02 12:19:19,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1064364923] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:19,718 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622104217] [2021-05-02 12:19:19,718 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:19,753 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:19,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:19,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 12:19:19,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:19,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:19,818 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:19,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622104217] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:19,818 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:19,818 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 12:19:19,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219955248] [2021-05-02 12:19:19,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:19:19,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:19,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:19:19,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:19:19,820 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:19,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:19,963 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2021-05-02 12:19:19,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:19:19,963 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 12:19:19,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:19,964 INFO L225 Difference]: With dead ends: 22 [2021-05-02 12:19:19,964 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 12:19:19,964 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 182.2ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:19:19,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 12:19:19,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 12:19:19,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:19,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2021-05-02 12:19:19,967 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2021-05-02 12:19:19,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:19,967 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2021-05-02 12:19:19,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:19,967 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2021-05-02 12:19:19,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 12:19:19,967 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:19,967 INFO L523 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:20,170 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:20,170 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:20,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:20,170 INFO L82 PathProgramCache]: Analyzing trace with hash -63863818, now seen corresponding path program 5 times [2021-05-02 12:19:20,171 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:20,171 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58685543] [2021-05-02 12:19:20,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:20,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:20,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:20,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:20,276 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:20,277 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:20,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58685543] [2021-05-02 12:19:20,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [58685543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:20,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [967977127] [2021-05-02 12:19:20,277 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:20,311 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 12:19:20,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:20,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:19:20,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:20,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:20,382 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:20,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [967977127] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:20,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:20,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 12:19:20,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189144105] [2021-05-02 12:19:20,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:19:20,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:20,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:19:20,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:19:20,383 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:20,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:20,561 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2021-05-02 12:19:20,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:19:20,561 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-02 12:19:20,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:20,562 INFO L225 Difference]: With dead ends: 23 [2021-05-02 12:19:20,562 INFO L226 Difference]: Without dead ends: 18 [2021-05-02 12:19:20,562 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 218.6ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:19:20,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-02 12:19:20,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-05-02 12:19:20,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:20,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2021-05-02 12:19:20,565 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2021-05-02 12:19:20,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:20,565 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2021-05-02 12:19:20,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:20,565 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2021-05-02 12:19:20,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:19:20,565 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:20,566 INFO L523 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:20,780 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 12:19:20,781 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:20,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:20,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1943317092, now seen corresponding path program 6 times [2021-05-02 12:19:20,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:20,781 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300004601] [2021-05-02 12:19:20,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:20,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:20,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:20,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:20,889 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:20,889 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:20,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300004601] [2021-05-02 12:19:20,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300004601] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:20,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956804419] [2021-05-02 12:19:20,890 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:20,962 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 12:19:20,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:20,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:19:20,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:21,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:21,037 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:21,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956804419] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:21,037 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:21,037 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:19:21,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426470880] [2021-05-02 12:19:21,039 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:19:21,039 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:21,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:19:21,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:19:21,039 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:21,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:21,228 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2021-05-02 12:19:21,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:19:21,228 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 12:19:21,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:21,229 INFO L225 Difference]: With dead ends: 24 [2021-05-02 12:19:21,229 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 12:19:21,229 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 209.7ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:19:21,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 12:19:21,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 12:19:21,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:21,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2021-05-02 12:19:21,237 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2021-05-02 12:19:21,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:21,237 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2021-05-02 12:19:21,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:21,237 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2021-05-02 12:19:21,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 12:19:21,238 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:21,238 INFO L523 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:21,441 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:21,441 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:21,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:21,442 INFO L82 PathProgramCache]: Analyzing trace with hash -76826442, now seen corresponding path program 7 times [2021-05-02 12:19:21,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:21,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783956016] [2021-05-02 12:19:21,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:21,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:21,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:21,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:21,581 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:21,582 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:21,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783956016] [2021-05-02 12:19:21,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [783956016] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:21,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96074715] [2021-05-02 12:19:21,582 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:21,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:21,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:19:21,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:21,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:21,655 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:21,656 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96074715] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:21,656 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:21,656 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:19:21,656 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572780339] [2021-05-02 12:19:21,656 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:19:21,656 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:21,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:19:21,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:19:21,657 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:21,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:21,889 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2021-05-02 12:19:21,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:19:21,890 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 12:19:21,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:21,890 INFO L225 Difference]: With dead ends: 25 [2021-05-02 12:19:21,890 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 12:19:21,891 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 253.8ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:19:21,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 12:19:21,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-02 12:19:21,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 15 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:21,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2021-05-02 12:19:21,893 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2021-05-02 12:19:21,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:21,894 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2021-05-02 12:19:21,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:21,894 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2021-05-02 12:19:21,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 12:19:21,894 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:21,894 INFO L523 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:22,100 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:22,101 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:22,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:22,101 INFO L82 PathProgramCache]: Analyzing trace with hash 1949808860, now seen corresponding path program 8 times [2021-05-02 12:19:22,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:22,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584184801] [2021-05-02 12:19:22,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:22,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:22,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:22,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:22,226 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:22,226 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:22,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584184801] [2021-05-02 12:19:22,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584184801] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:22,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [340964075] [2021-05-02 12:19:22,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:22,275 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:22,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:22,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:19:22,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:22,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:22,322 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:22,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [340964075] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:22,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:22,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:19:22,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865723195] [2021-05-02 12:19:22,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:19:22,324 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:22,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:19:22,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:19:22,324 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:22,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:22,563 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2021-05-02 12:19:22,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:19:22,563 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 12:19:22,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:22,564 INFO L225 Difference]: With dead ends: 26 [2021-05-02 12:19:22,564 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 12:19:22,564 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 272.5ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:19:22,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 12:19:22,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-02 12:19:22,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:22,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2021-05-02 12:19:22,570 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2021-05-02 12:19:22,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:22,570 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2021-05-02 12:19:22,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:22,570 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2021-05-02 12:19:22,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 12:19:22,571 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:22,571 INFO L523 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:22,777 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 12:19:22,777 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:22,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:22,777 INFO L82 PathProgramCache]: Analyzing trace with hash 350993782, now seen corresponding path program 9 times [2021-05-02 12:19:22,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:22,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766558295] [2021-05-02 12:19:22,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:22,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:22,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:22,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:22,895 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:22,895 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:22,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766558295] [2021-05-02 12:19:22,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766558295] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:22,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249443012] [2021-05-02 12:19:22,895 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:22,981 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 12:19:22,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:22,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 12:19:22,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:23,026 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:23,027 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [249443012] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:23,027 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:23,027 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:19:23,027 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160211691] [2021-05-02 12:19:23,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:19:23,028 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:23,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:19:23,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:19:23,028 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:23,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:23,304 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2021-05-02 12:19:23,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:19:23,304 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 12:19:23,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:23,306 INFO L225 Difference]: With dead ends: 27 [2021-05-02 12:19:23,306 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 12:19:23,306 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 282.5ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:19:23,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 12:19:23,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 12:19:23,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:23,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2021-05-02 12:19:23,310 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2021-05-02 12:19:23,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:23,311 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2021-05-02 12:19:23,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:23,311 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2021-05-02 12:19:23,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 12:19:23,311 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:23,311 INFO L523 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:23,516 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:23,517 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:23,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:23,517 INFO L82 PathProgramCache]: Analyzing trace with hash -1967633380, now seen corresponding path program 10 times [2021-05-02 12:19:23,517 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:23,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515601049] [2021-05-02 12:19:23,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:23,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:23,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:23,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:23,648 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:23,648 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:23,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515601049] [2021-05-02 12:19:23,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [515601049] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:23,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781002121] [2021-05-02 12:19:23,649 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:23,677 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:23,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:23,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 12:19:23,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:23,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:23,725 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:23,725 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [781002121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:23,725 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:23,725 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 12:19:23,725 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449906133] [2021-05-02 12:19:23,725 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:19:23,725 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:23,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:19:23,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:19:23,726 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:24,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:24,070 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2021-05-02 12:19:24,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:19:24,072 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 12:19:24,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:24,072 INFO L225 Difference]: With dead ends: 28 [2021-05-02 12:19:24,072 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 12:19:24,072 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 364.9ms TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:19:24,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 12:19:24,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 12:19:24,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:24,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2021-05-02 12:19:24,075 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2021-05-02 12:19:24,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:24,075 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2021-05-02 12:19:24,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:24,075 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2021-05-02 12:19:24,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 12:19:24,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:24,076 INFO L523 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:24,287 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:24,287 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:24,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:24,288 INFO L82 PathProgramCache]: Analyzing trace with hash -830631370, now seen corresponding path program 11 times [2021-05-02 12:19:24,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:24,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333659454] [2021-05-02 12:19:24,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:24,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:24,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:24,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:24,441 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:24,441 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:24,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333659454] [2021-05-02 12:19:24,441 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1333659454] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:24,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696126756] [2021-05-02 12:19:24,441 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:24,641 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-02 12:19:24,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:24,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 12:19:24,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:24,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:24,794 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:24,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [696126756] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:24,794 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:24,794 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 12:19:24,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500413680] [2021-05-02 12:19:24,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:19:24,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:24,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:19:24,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:19:24,795 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 16 states, 16 states have (on average 1.3125) internal successors, (21), 15 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:25,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:25,201 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2021-05-02 12:19:25,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:19:25,201 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.3125) internal successors, (21), 15 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 12:19:25,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:25,202 INFO L225 Difference]: With dead ends: 29 [2021-05-02 12:19:25,202 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 12:19:25,202 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 13 SyntacticMatches, 11 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 478.2ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:19:25,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 12:19:25,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 12:19:25,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:25,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2021-05-02 12:19:25,206 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2021-05-02 12:19:25,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:25,206 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2021-05-02 12:19:25,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.3125) internal successors, (21), 15 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:25,206 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2021-05-02 12:19:25,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:19:25,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:25,207 INFO L523 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:25,409 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 12:19:25,410 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:25,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:25,410 INFO L82 PathProgramCache]: Analyzing trace with hash 56692572, now seen corresponding path program 12 times [2021-05-02 12:19:25,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:25,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935034338] [2021-05-02 12:19:25,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:25,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:25,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:25,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:25,576 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:25,576 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:25,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935034338] [2021-05-02 12:19:25,576 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935034338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:25,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880274724] [2021-05-02 12:19:25,576 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:25,711 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:19:25,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:25,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 12:19:25,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:25,769 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:25,769 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880274724] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:25,769 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:25,769 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:19:25,769 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463549522] [2021-05-02 12:19:25,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:19:25,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:25,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:19:25,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:19:25,771 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:26,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:26,182 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2021-05-02 12:19:26,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:19:26,182 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 12:19:26,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:26,183 INFO L225 Difference]: With dead ends: 30 [2021-05-02 12:19:26,183 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 12:19:26,183 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 425.5ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:19:26,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 12:19:26,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-02 12:19:26,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:26,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2021-05-02 12:19:26,185 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2021-05-02 12:19:26,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:26,186 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2021-05-02 12:19:26,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:26,186 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2021-05-02 12:19:26,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 12:19:26,186 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:26,186 INFO L523 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:26,389 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 12:19:26,389 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:26,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:26,389 INFO L82 PathProgramCache]: Analyzing trace with hash 1793930998, now seen corresponding path program 13 times [2021-05-02 12:19:26,389 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:26,389 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148391382] [2021-05-02 12:19:26,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:26,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:26,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:26,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:26,566 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:26,566 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:26,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148391382] [2021-05-02 12:19:26,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1148391382] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:26,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474591356] [2021-05-02 12:19:26,566 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:26,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:26,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 12:19:26,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:26,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:26,647 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:26,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474591356] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:26,648 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:26,648 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 12:19:26,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493724760] [2021-05-02 12:19:26,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:19:26,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:26,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:19:26,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:19:26,649 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:27,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:27,080 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2021-05-02 12:19:27,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:19:27,081 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-02 12:19:27,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:27,081 INFO L225 Difference]: With dead ends: 31 [2021-05-02 12:19:27,081 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 12:19:27,082 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 457.0ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:19:27,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 12:19:27,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-02 12:19:27,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 21 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:27,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2021-05-02 12:19:27,086 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2021-05-02 12:19:27,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:27,086 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2021-05-02 12:19:27,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:27,086 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2021-05-02 12:19:27,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 12:19:27,086 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:27,086 INFO L523 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:27,304 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:19:27,305 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:27,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:27,305 INFO L82 PathProgramCache]: Analyzing trace with hash -186252644, now seen corresponding path program 14 times [2021-05-02 12:19:27,305 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:27,305 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760337158] [2021-05-02 12:19:27,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:27,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:27,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:27,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:27,519 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:27,519 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:27,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760337158] [2021-05-02 12:19:27,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760337158] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:27,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930839064] [2021-05-02 12:19:27,519 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:27,559 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:27,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:27,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 12:19:27,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:27,628 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:27,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1930839064] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:27,629 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:27,629 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:19:27,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91952690] [2021-05-02 12:19:27,629 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:19:27,629 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:27,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:19:27,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:19:27,630 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand has 19 states, 19 states have (on average 1.263157894736842) internal successors, (24), 18 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:28,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:28,147 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2021-05-02 12:19:28,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:19:28,148 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.263157894736842) internal successors, (24), 18 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 12:19:28,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:28,149 INFO L225 Difference]: With dead ends: 32 [2021-05-02 12:19:28,149 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 12:19:28,150 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 559.7ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:19:28,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 12:19:28,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-02 12:19:28,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:28,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2021-05-02 12:19:28,153 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2021-05-02 12:19:28,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:28,153 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2021-05-02 12:19:28,153 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.263157894736842) internal successors, (24), 18 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:28,153 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2021-05-02 12:19:28,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 12:19:28,155 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:28,155 INFO L523 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:28,368 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:28,369 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:28,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:28,369 INFO L82 PathProgramCache]: Analyzing trace with hash -1442403402, now seen corresponding path program 15 times [2021-05-02 12:19:28,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:28,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111616265] [2021-05-02 12:19:28,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:28,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:28,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:28,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:28,586 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:28,586 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:28,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111616265] [2021-05-02 12:19:28,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111616265] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:28,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [944862673] [2021-05-02 12:19:28,586 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:28,719 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-05-02 12:19:28,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:28,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 12:19:28,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:28,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:28,776 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:28,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [944862673] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:28,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:28,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:19:28,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721523698] [2021-05-02 12:19:28,777 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:19:28,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:28,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:19:28,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:19:28,777 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 20 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:29,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:29,351 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2021-05-02 12:19:29,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:19:29,351 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 12:19:29,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:29,352 INFO L225 Difference]: With dead ends: 33 [2021-05-02 12:19:29,352 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 12:19:29,352 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 565.2ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:19:29,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 12:19:29,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 12:19:29,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:29,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2021-05-02 12:19:29,354 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2021-05-02 12:19:29,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:29,355 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2021-05-02 12:19:29,355 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:29,355 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2021-05-02 12:19:29,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 12:19:29,355 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:29,355 INFO L523 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:29,558 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 12:19:29,558 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:29,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:29,559 INFO L82 PathProgramCache]: Analyzing trace with hash -1728371236, now seen corresponding path program 16 times [2021-05-02 12:19:29,559 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:29,559 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [124511031] [2021-05-02 12:19:29,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:29,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:29,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:29,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:29,819 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:29,819 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:29,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [124511031] [2021-05-02 12:19:29,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [124511031] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:29,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1130918712] [2021-05-02 12:19:29,819 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:29,849 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:29,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:29,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 12:19:29,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:29,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:29,925 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:29,925 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1130918712] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:29,925 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:29,925 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:19:29,925 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459991276] [2021-05-02 12:19:29,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:19:29,925 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:29,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:19:29,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:19:29,926 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand has 21 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 20 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:30,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:30,512 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2021-05-02 12:19:30,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:19:30,512 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 20 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 12:19:30,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:30,512 INFO L225 Difference]: With dead ends: 34 [2021-05-02 12:19:30,512 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 12:19:30,513 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 639.2ms TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:19:30,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 12:19:30,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 12:19:30,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:30,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2021-05-02 12:19:30,516 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2021-05-02 12:19:30,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:30,516 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2021-05-02 12:19:30,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 20 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:30,516 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2021-05-02 12:19:30,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 12:19:30,516 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:30,516 INFO L523 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:30,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 12:19:30,724 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:30,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:30,725 INFO L82 PathProgramCache]: Analyzing trace with hash -2003439498, now seen corresponding path program 17 times [2021-05-02 12:19:30,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:30,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182979413] [2021-05-02 12:19:30,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:30,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:30,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:30,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:30,988 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:30,988 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:30,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182979413] [2021-05-02 12:19:30,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182979413] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:30,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590055438] [2021-05-02 12:19:30,989 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:32,655 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 12:19:32,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:32,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 12:19:32,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:32,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:32,899 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:32,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590055438] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:32,899 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:32,899 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 12:19:32,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938336746] [2021-05-02 12:19:32,900 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:19:32,900 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:32,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:19:32,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:19:32,900 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand has 22 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 21 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:33,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:33,576 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2021-05-02 12:19:33,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:19:33,577 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 21 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 12:19:33,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:33,577 INFO L225 Difference]: With dead ends: 35 [2021-05-02 12:19:33,577 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 12:19:33,581 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 13 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 890.2ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:19:33,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 12:19:33,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 12:19:33,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.04) internal successors, (26), 25 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:33,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2021-05-02 12:19:33,593 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2021-05-02 12:19:33,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:33,594 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2021-05-02 12:19:33,594 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 21 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:33,594 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2021-05-02 12:19:33,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:19:33,597 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:33,597 INFO L523 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:33,797 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:33,797 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:33,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:33,798 INFO L82 PathProgramCache]: Analyzing trace with hash -1940621028, now seen corresponding path program 18 times [2021-05-02 12:19:33,798 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:33,798 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922808101] [2021-05-02 12:19:33,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:33,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:34,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:34,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:34,050 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:34,050 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:34,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922808101] [2021-05-02 12:19:34,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922808101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:34,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391414169] [2021-05-02 12:19:34,051 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:34,240 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-05-02 12:19:34,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:34,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 12:19:34,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:34,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:34,406 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:34,407 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1391414169] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:34,407 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:34,407 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:19:34,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221617136] [2021-05-02 12:19:34,408 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:19:34,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:34,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:19:34,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:19:34,408 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand has 23 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 22 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:35,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:35,076 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2021-05-02 12:19:35,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:19:35,076 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 22 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 12:19:35,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:35,077 INFO L225 Difference]: With dead ends: 36 [2021-05-02 12:19:35,077 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 12:19:35,077 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 25 SyntacticMatches, 6 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 787.8ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:19:35,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 12:19:35,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-02 12:19:35,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:35,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2021-05-02 12:19:35,080 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2021-05-02 12:19:35,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:35,080 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2021-05-02 12:19:35,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 22 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:35,080 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2021-05-02 12:19:35,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 12:19:35,080 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:35,081 INFO L523 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:35,281 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:35,281 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:35,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:35,281 INFO L82 PathProgramCache]: Analyzing trace with hash 6751542, now seen corresponding path program 19 times [2021-05-02 12:19:35,282 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:35,282 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468651672] [2021-05-02 12:19:35,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:35,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:35,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:35,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:35,569 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:35,569 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:35,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468651672] [2021-05-02 12:19:35,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468651672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:35,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1375105491] [2021-05-02 12:19:35,570 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:35,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:35,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 12:19:35,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:35,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:35,692 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:35,692 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1375105491] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:35,692 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:35,692 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:19:35,692 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255597805] [2021-05-02 12:19:35,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:19:35,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:35,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:19:35,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:19:35,695 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand has 24 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 23 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:36,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:36,432 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2021-05-02 12:19:36,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:19:36,433 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 23 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 12:19:36,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:36,433 INFO L225 Difference]: With dead ends: 37 [2021-05-02 12:19:36,433 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 12:19:36,434 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 770.5ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:19:36,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 12:19:36,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 12:19:36,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.037037037037037) internal successors, (28), 27 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:36,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2021-05-02 12:19:36,436 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2021-05-02 12:19:36,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:36,437 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2021-05-02 12:19:36,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 23 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:36,437 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2021-05-02 12:19:36,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 12:19:36,437 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:36,437 INFO L523 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:36,652 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:36,653 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:36,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:36,653 INFO L82 PathProgramCache]: Analyzing trace with hash 245759068, now seen corresponding path program 20 times [2021-05-02 12:19:36,653 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:36,653 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901493231] [2021-05-02 12:19:36,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:36,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:36,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:36,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:36,961 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:36,961 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:36,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901493231] [2021-05-02 12:19:36,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901493231] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:36,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900065344] [2021-05-02 12:19:36,961 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:37,017 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:37,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:37,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 12:19:37,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:37,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:37,090 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:37,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900065344] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:37,090 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:37,090 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:19:37,090 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256673708] [2021-05-02 12:19:37,091 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:19:37,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:37,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:19:37,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:19:37,091 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand has 25 states, 25 states have (on average 1.2) internal successors, (30), 24 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:37,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:37,846 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2021-05-02 12:19:37,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:19:37,846 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.2) internal successors, (30), 24 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 12:19:37,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:37,846 INFO L225 Difference]: With dead ends: 38 [2021-05-02 12:19:37,846 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 12:19:37,847 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 807.1ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:19:37,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 12:19:37,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-02 12:19:37,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:37,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2021-05-02 12:19:37,850 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2021-05-02 12:19:37,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:37,850 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2021-05-02 12:19:37,850 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.2) internal successors, (30), 24 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:37,850 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2021-05-02 12:19:37,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:19:37,850 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:37,850 INFO L523 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:38,053 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 12:19:38,053 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:38,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:38,053 INFO L82 PathProgramCache]: Analyzing trace with hash -934942218, now seen corresponding path program 21 times [2021-05-02 12:19:38,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:38,053 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016838112] [2021-05-02 12:19:38,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:38,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:38,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:38,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:38,389 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:38,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:38,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016838112] [2021-05-02 12:19:38,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016838112] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:38,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351193365] [2021-05-02 12:19:38,389 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:38,573 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-05-02 12:19:38,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:38,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 12:19:38,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:38,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:38,658 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:38,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351193365] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:38,658 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:38,658 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 12:19:38,658 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922799485] [2021-05-02 12:19:38,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:19:38,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:38,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:19:38,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:19:38,659 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 26 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 25 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:39,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:39,489 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2021-05-02 12:19:39,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 12:19:39,489 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 25 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 12:19:39,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:39,490 INFO L225 Difference]: With dead ends: 39 [2021-05-02 12:19:39,490 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 12:19:39,490 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 853.9ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 12:19:39,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 12:19:39,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 12:19:39,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:39,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2021-05-02 12:19:39,493 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2021-05-02 12:19:39,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:39,493 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2021-05-02 12:19:39,493 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 25 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:39,493 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2021-05-02 12:19:39,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 12:19:39,493 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:39,493 INFO L523 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:39,696 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 12:19:39,696 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:39,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:39,696 INFO L82 PathProgramCache]: Analyzing trace with hash 1118023580, now seen corresponding path program 22 times [2021-05-02 12:19:39,696 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:39,696 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92212314] [2021-05-02 12:19:39,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:39,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:40,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:40,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:40,045 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:40,045 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:40,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92212314] [2021-05-02 12:19:40,045 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92212314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:40,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [692136785] [2021-05-02 12:19:40,045 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:40,094 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:40,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:40,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 12:19:40,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:40,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,165 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:40,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [692136785] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:40,166 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:40,166 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-02 12:19:40,166 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079341979] [2021-05-02 12:19:40,166 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 12:19:40,166 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:40,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 12:19:40,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:19:40,167 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand has 27 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 26 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:41,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:41,050 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2021-05-02 12:19:41,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:19:41,050 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 26 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 12:19:41,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:41,051 INFO L225 Difference]: With dead ends: 40 [2021-05-02 12:19:41,051 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 12:19:41,051 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 905.1ms TimeCoverageRelationStatistics Valid=189, Invalid=2261, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:19:41,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 12:19:41,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 12:19:41,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:41,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2021-05-02 12:19:41,054 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2021-05-02 12:19:41,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:41,054 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2021-05-02 12:19:41,054 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 26 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:41,054 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2021-05-02 12:19:41,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 12:19:41,054 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:41,054 INFO L523 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:41,262 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:41,262 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:41,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:41,262 INFO L82 PathProgramCache]: Analyzing trace with hash 335453878, now seen corresponding path program 23 times [2021-05-02 12:19:41,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:41,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994289080] [2021-05-02 12:19:41,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:41,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:41,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:41,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:41,621 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:41,621 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:41,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994289080] [2021-05-02 12:19:41,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994289080] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:41,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663369408] [2021-05-02 12:19:41,621 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:45,000 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 12:19:45,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:45,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 69 conjunts are in the unsatisfiable core [2021-05-02 12:19:45,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:45,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:45,334 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:45,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663369408] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:45,334 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:45,334 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 12:19:45,334 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794126660] [2021-05-02 12:19:45,334 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:19:45,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:45,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:19:45,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:19:45,335 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 27 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:46,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:46,235 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2021-05-02 12:19:46,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:19:46,236 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 27 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 12:19:46,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:46,236 INFO L225 Difference]: With dead ends: 41 [2021-05-02 12:19:46,236 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 12:19:46,237 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 15 SyntacticMatches, 21 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1179.0ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:19:46,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 12:19:46,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 12:19:46,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.032258064516129) internal successors, (32), 31 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:46,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2021-05-02 12:19:46,239 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2021-05-02 12:19:46,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:46,239 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2021-05-02 12:19:46,239 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 27 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:46,239 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2021-05-02 12:19:46,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 12:19:46,239 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:46,240 INFO L523 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:46,443 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 12:19:46,443 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:46,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:46,444 INFO L82 PathProgramCache]: Analyzing trace with hash 1845596892, now seen corresponding path program 24 times [2021-05-02 12:19:46,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:46,444 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030675771] [2021-05-02 12:19:46,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:46,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:46,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:46,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:46,837 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:46,837 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:46,837 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030675771] [2021-05-02 12:19:46,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030675771] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:46,837 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1158772980] [2021-05-02 12:19:46,837 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:47,325 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 12:19:47,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:47,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 12:19:47,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:47,415 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:47,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1158772980] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:47,415 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:47,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 12:19:47,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124665266] [2021-05-02 12:19:47,415 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:19:47,415 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:47,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:19:47,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:19:47,416 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand has 29 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 28 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:48,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:48,409 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2021-05-02 12:19:48,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 12:19:48,409 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 28 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 12:19:48,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:48,409 INFO L225 Difference]: With dead ends: 42 [2021-05-02 12:19:48,409 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 12:19:48,410 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 303 ImplicationChecksByTransitivity, 1048.4ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 12:19:48,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 12:19:48,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-02 12:19:48,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:48,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2021-05-02 12:19:48,412 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2021-05-02 12:19:48,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:48,413 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2021-05-02 12:19:48,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 28 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:48,413 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2021-05-02 12:19:48,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 12:19:48,413 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:48,413 INFO L523 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:48,616 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:48,616 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:48,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:48,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1415390070, now seen corresponding path program 25 times [2021-05-02 12:19:48,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:48,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330847597] [2021-05-02 12:19:48,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:48,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:49,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:49,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:49,078 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:49,078 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:49,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330847597] [2021-05-02 12:19:49,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330847597] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:49,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2127798450] [2021-05-02 12:19:49,078 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:49,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:49,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 12:19:49,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:49,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:49,220 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:49,220 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2127798450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:49,220 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:49,220 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 12:19:49,220 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543465291] [2021-05-02 12:19:49,220 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:19:49,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:49,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:19:49,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:19:49,221 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand has 30 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 29 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:50,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:50,259 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2021-05-02 12:19:50,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 12:19:50,260 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 29 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 12:19:50,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:50,260 INFO L225 Difference]: With dead ends: 43 [2021-05-02 12:19:50,260 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 12:19:50,261 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 1149.5ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:19:50,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 12:19:50,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 12:19:50,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 33 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:50,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2021-05-02 12:19:50,264 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2021-05-02 12:19:50,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:50,265 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2021-05-02 12:19:50,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 29 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:50,265 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2021-05-02 12:19:50,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 12:19:50,265 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:50,265 INFO L523 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:50,478 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 12:19:50,478 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:50,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:50,479 INFO L82 PathProgramCache]: Analyzing trace with hash 963880476, now seen corresponding path program 26 times [2021-05-02 12:19:50,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:50,479 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216176047] [2021-05-02 12:19:50,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:50,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:50,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:50,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:50,950 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:50,950 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:50,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216176047] [2021-05-02 12:19:50,950 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216176047] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:50,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976321359] [2021-05-02 12:19:50,950 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:51,003 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:51,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:51,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 12:19:51,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:51,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:51,083 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:51,083 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976321359] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:51,083 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:51,083 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 12:19:51,083 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729052572] [2021-05-02 12:19:51,083 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 12:19:51,083 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:51,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 12:19:51,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:19:51,084 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand has 31 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 30 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:52,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:52,165 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2021-05-02 12:19:52,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 12:19:52,166 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 30 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 12:19:52,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:52,166 INFO L225 Difference]: With dead ends: 44 [2021-05-02 12:19:52,166 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 12:19:52,167 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 1183.4ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 12:19:52,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 12:19:52,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-02 12:19:52,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:52,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2021-05-02 12:19:52,169 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2021-05-02 12:19:52,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:52,169 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2021-05-02 12:19:52,169 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 30 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:52,169 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2021-05-02 12:19:52,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:19:52,170 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:52,170 INFO L523 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:52,372 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 12:19:52,372 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:52,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:52,373 INFO L82 PathProgramCache]: Analyzing trace with hash -148015050, now seen corresponding path program 27 times [2021-05-02 12:19:52,373 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:52,373 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681374970] [2021-05-02 12:19:52,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:52,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:52,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:52,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:52,892 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:52,892 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:52,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681374970] [2021-05-02 12:19:52,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [681374970] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:52,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915874892] [2021-05-02 12:19:52,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:53,229 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-05-02 12:19:53,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:53,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 12:19:53,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:53,366 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:53,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915874892] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:53,366 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:53,366 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 12:19:53,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025618938] [2021-05-02 12:19:53,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 12:19:53,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:53,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 12:19:53,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:19:53,367 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand has 32 states, 32 states have (on average 1.15625) internal successors, (37), 31 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:54,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:54,540 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2021-05-02 12:19:54,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 12:19:54,541 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.15625) internal successors, (37), 31 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 12:19:54,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:54,541 INFO L225 Difference]: With dead ends: 45 [2021-05-02 12:19:54,541 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 12:19:54,542 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 35 SyntacticMatches, 5 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 1333.5ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 12:19:54,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 12:19:54,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-02 12:19:54,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 35 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:54,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2021-05-02 12:19:54,544 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2021-05-02 12:19:54,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:54,544 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2021-05-02 12:19:54,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.15625) internal successors, (37), 31 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:54,544 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2021-05-02 12:19:54,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 12:19:54,545 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:54,545 INFO L523 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:54,745 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 12:19:54,745 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:54,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:54,745 INFO L82 PathProgramCache]: Analyzing trace with hash -257037988, now seen corresponding path program 28 times [2021-05-02 12:19:54,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:54,746 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604941347] [2021-05-02 12:19:54,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:54,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:55,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:55,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:55,268 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:55,268 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:55,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604941347] [2021-05-02 12:19:55,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604941347] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:55,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213072106] [2021-05-02 12:19:55,268 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:55,303 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:55,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:55,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 12:19:55,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:55,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:55,388 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:55,388 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213072106] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:55,388 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:55,388 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-02 12:19:55,388 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854241696] [2021-05-02 12:19:55,388 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 12:19:55,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:55,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 12:19:55,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:19:55,389 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:56,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:56,590 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2021-05-02 12:19:56,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:19:56,591 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 12:19:56,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:56,591 INFO L225 Difference]: With dead ends: 46 [2021-05-02 12:19:56,591 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 12:19:56,592 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 409 ImplicationChecksByTransitivity, 1327.9ms TimeCoverageRelationStatistics Valid=237, Invalid=3545, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 12:19:56,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 12:19:56,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-05-02 12:19:56,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:56,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2021-05-02 12:19:56,595 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2021-05-02 12:19:56,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:56,595 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2021-05-02 12:19:56,595 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:56,595 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2021-05-02 12:19:56,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 12:19:56,595 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:56,595 INFO L523 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:56,809 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:56,810 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:56,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:56,810 INFO L82 PathProgramCache]: Analyzing trace with hash 658218230, now seen corresponding path program 29 times [2021-05-02 12:19:56,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:56,810 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022304689] [2021-05-02 12:19:56,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:56,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:57,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:57,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:57,322 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:57,323 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:57,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022304689] [2021-05-02 12:19:57,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1022304689] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:57,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [83405773] [2021-05-02 12:19:57,323 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:12,469 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2021-05-02 12:20:12,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:12,473 WARN L261 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 12:20:12,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:12,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:12,948 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:12,948 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [83405773] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:12,948 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:12,948 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 12:20:12,948 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391936083] [2021-05-02 12:20:12,948 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 12:20:12,949 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:12,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 12:20:12,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:20:12,949 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand has 34 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 33 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:14,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:14,184 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2021-05-02 12:20:14,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 12:20:14,185 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 33 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 12:20:14,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:14,185 INFO L225 Difference]: With dead ends: 47 [2021-05-02 12:20:14,185 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 12:20:14,186 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 15 SyntacticMatches, 27 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 1753.7ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 12:20:14,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 12:20:14,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 12:20:14,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:14,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2021-05-02 12:20:14,193 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2021-05-02 12:20:14,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:14,193 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2021-05-02 12:20:14,193 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 33 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:14,193 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2021-05-02 12:20:14,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 12:20:14,194 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:14,194 INFO L523 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:14,396 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 12:20:14,397 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:14,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:14,397 INFO L82 PathProgramCache]: Analyzing trace with hash -1033610084, now seen corresponding path program 30 times [2021-05-02 12:20:14,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:14,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695656568] [2021-05-02 12:20:14,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:14,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:14,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:14,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:14,936 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:14,936 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:14,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695656568] [2021-05-02 12:20:14,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [695656568] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:14,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483415149] [2021-05-02 12:20:14,936 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:16,232 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2021-05-02 12:20:16,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:16,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 69 conjunts are in the unsatisfiable core [2021-05-02 12:20:16,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:16,334 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:16,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [483415149] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:16,334 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:16,334 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 12:20:16,335 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084755576] [2021-05-02 12:20:16,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 12:20:16,335 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:16,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 12:20:16,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:20:16,335 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand has 35 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 34 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:17,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:17,614 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2021-05-02 12:20:17,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 12:20:17,614 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 34 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 12:20:17,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:17,615 INFO L225 Difference]: With dead ends: 48 [2021-05-02 12:20:17,615 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 12:20:17,616 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 1413.0ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:20:17,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 12:20:17,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-02 12:20:17,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:17,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2021-05-02 12:20:17,618 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2021-05-02 12:20:17,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:17,618 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2021-05-02 12:20:17,618 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 34 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:17,619 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2021-05-02 12:20:17,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 12:20:17,619 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:17,619 INFO L523 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:17,819 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:17,819 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:17,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:17,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1940680266, now seen corresponding path program 31 times [2021-05-02 12:20:17,820 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:17,820 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167281708] [2021-05-02 12:20:17,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:17,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:18,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:18,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:18,399 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:18,399 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:18,399 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167281708] [2021-05-02 12:20:18,399 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167281708] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:18,399 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325351754] [2021-05-02 12:20:18,399 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:18,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:18,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 12:20:18,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:18,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:18,542 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:18,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325351754] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:18,542 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:18,542 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 12:20:18,542 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546827595] [2021-05-02 12:20:18,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:20:18,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:18,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:20:18,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:20:18,544 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand has 36 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 35 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:20,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:20,020 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2021-05-02 12:20:20,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:20:20,021 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 35 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 12:20:20,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:20,021 INFO L225 Difference]: With dead ends: 49 [2021-05-02 12:20:20,021 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 12:20:20,022 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 1567.8ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:20:20,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 12:20:20,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 12:20:20,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 39 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:20,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2021-05-02 12:20:20,024 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2021-05-02 12:20:20,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:20,024 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2021-05-02 12:20:20,024 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 35 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:20,024 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2021-05-02 12:20:20,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 12:20:20,025 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:20,025 INFO L523 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:20,225 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 12:20:20,225 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:20,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:20,226 INFO L82 PathProgramCache]: Analyzing trace with hash 4915164, now seen corresponding path program 32 times [2021-05-02 12:20:20,226 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:20,226 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124405986] [2021-05-02 12:20:20,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:20,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:20,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:20,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:20,845 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:20,845 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:20,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124405986] [2021-05-02 12:20:20,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124405986] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:20,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845891965] [2021-05-02 12:20:20,845 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:20,901 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:20:20,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:20,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 12:20:20,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:20,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:20,994 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:20,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845891965] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:20,994 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:20,994 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 12:20:20,995 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836277565] [2021-05-02 12:20:20,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 12:20:20,995 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:20,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 12:20:20,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:20:20,995 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand has 37 states, 37 states have (on average 1.135135135135135) internal successors, (42), 36 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:22,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:22,485 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2021-05-02 12:20:22,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 12:20:22,486 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.135135135135135) internal successors, (42), 36 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 12:20:22,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:22,486 INFO L225 Difference]: With dead ends: 50 [2021-05-02 12:20:22,486 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 12:20:22,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 1585.3ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 12:20:22,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 12:20:22,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 12:20:22,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:22,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2021-05-02 12:20:22,489 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2021-05-02 12:20:22,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:22,489 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2021-05-02 12:20:22,489 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.135135135135135) internal successors, (42), 36 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:22,489 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2021-05-02 12:20:22,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 12:20:22,490 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:22,490 INFO L523 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:22,692 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 12:20:22,693 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:22,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:22,693 INFO L82 PathProgramCache]: Analyzing trace with hash 188831350, now seen corresponding path program 33 times [2021-05-02 12:20:22,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:22,693 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784922615] [2021-05-02 12:20:22,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:22,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:23,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:23,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:23,297 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:23,297 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:23,297 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784922615] [2021-05-02 12:20:23,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784922615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:23,297 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1096482234] [2021-05-02 12:20:23,297 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:23,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-02 12:20:23,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:23,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 78 conjunts are in the unsatisfiable core [2021-05-02 12:20:23,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:24,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:24,161 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:24,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1096482234] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:24,166 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:24,166 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 12:20:24,166 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911865309] [2021-05-02 12:20:24,166 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 12:20:24,166 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:24,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 12:20:24,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:20:24,167 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand has 38 states, 38 states have (on average 1.131578947368421) internal successors, (43), 37 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:25,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:25,755 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2021-05-02 12:20:25,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 12:20:25,755 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.131578947368421) internal successors, (43), 37 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 12:20:25,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:25,756 INFO L225 Difference]: With dead ends: 51 [2021-05-02 12:20:25,756 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 12:20:25,756 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 37 SyntacticMatches, 9 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 580 ImplicationChecksByTransitivity, 1869.3ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 12:20:25,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 12:20:25,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-02 12:20:25,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.024390243902439) internal successors, (42), 41 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:25,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2021-05-02 12:20:25,759 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2021-05-02 12:20:25,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:25,759 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2021-05-02 12:20:25,759 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.131578947368421) internal successors, (43), 37 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:25,759 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2021-05-02 12:20:25,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 12:20:25,759 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:25,760 INFO L523 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:25,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 12:20:25,965 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:25,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:25,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1595265820, now seen corresponding path program 34 times [2021-05-02 12:20:25,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:25,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692552947] [2021-05-02 12:20:25,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:25,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:26,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:26,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:26,684 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:26,684 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:26,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692552947] [2021-05-02 12:20:26,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [692552947] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:26,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [561571446] [2021-05-02 12:20:26,684 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:26,723 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:20:26,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:26,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-02 12:20:26,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:26,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:26,815 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:26,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [561571446] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:26,815 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:26,816 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-02 12:20:26,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051465088] [2021-05-02 12:20:26,816 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 12:20:26,816 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:26,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 12:20:26,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:20:26,816 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand has 39 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 38 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:28,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:28,447 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2021-05-02 12:20:28,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 12:20:28,448 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 38 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 12:20:28,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:28,448 INFO L225 Difference]: With dead ends: 52 [2021-05-02 12:20:28,448 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 12:20:28,449 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 1781.2ms TimeCoverageRelationStatistics Valid=285, Invalid=5117, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 12:20:28,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 12:20:28,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-02 12:20:28,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:28,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2021-05-02 12:20:28,451 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2021-05-02 12:20:28,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:28,451 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2021-05-02 12:20:28,451 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 38 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:28,451 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2021-05-02 12:20:28,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 12:20:28,452 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:28,452 INFO L523 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:28,652 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 12:20:28,652 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:28,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:28,653 INFO L82 PathProgramCache]: Analyzing trace with hash -2049905866, now seen corresponding path program 35 times [2021-05-02 12:20:28,653 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:28,653 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821479445] [2021-05-02 12:20:28,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:28,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:29,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:29,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:29,359 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:29,359 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:29,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821479445] [2021-05-02 12:20:29,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821479445] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:29,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367898224] [2021-05-02 12:20:29,359 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:03,185 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2021-05-02 12:21:03,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:03,193 WARN L261 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-02 12:21:03,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:03,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:03,905 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:03,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367898224] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:03,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:03,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-02 12:21:03,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045868384] [2021-05-02 12:21:03,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 12:21:03,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:03,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 12:21:03,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:21:03,906 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand has 40 states, 40 states have (on average 1.125) internal successors, (45), 39 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:05,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:05,604 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2021-05-02 12:21:05,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 12:21:05,605 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.125) internal successors, (45), 39 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-02 12:21:05,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:05,605 INFO L225 Difference]: With dead ends: 53 [2021-05-02 12:21:05,605 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 12:21:05,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 14 SyntacticMatches, 34 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 699 ImplicationChecksByTransitivity, 2435.6ms TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 12:21:05,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 12:21:05,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-02 12:21:05,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 43 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:05,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2021-05-02 12:21:05,608 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2021-05-02 12:21:05,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:05,608 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2021-05-02 12:21:05,608 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.125) internal successors, (45), 39 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:05,608 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2021-05-02 12:21:05,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 12:21:05,609 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:05,609 INFO L523 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:05,809 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 12:21:05,809 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:05,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:05,810 INFO L82 PathProgramCache]: Analyzing trace with hash 913888860, now seen corresponding path program 36 times [2021-05-02 12:21:05,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:05,810 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181619766] [2021-05-02 12:21:05,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:05,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:06,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:06,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:06,514 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:06,514 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:06,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181619766] [2021-05-02 12:21:06,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181619766] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:06,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956120288] [2021-05-02 12:21:06,514 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:08,733 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 12:21:08,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:08,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 90 conjunts are in the unsatisfiable core [2021-05-02 12:21:08,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:09,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:09,158 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:09,159 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956120288] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:09,159 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:09,159 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 12:21:09,159 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822969979] [2021-05-02 12:21:09,159 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 12:21:09,159 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:09,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 12:21:09,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:21:09,160 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand has 41 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 40 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:10,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:10,981 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2021-05-02 12:21:10,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 12:21:10,985 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 40 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 12:21:10,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:10,985 INFO L225 Difference]: With dead ends: 54 [2021-05-02 12:21:10,985 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 12:21:10,986 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 34 SyntacticMatches, 15 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 697 ImplicationChecksByTransitivity, 2200.0ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 12:21:10,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 12:21:10,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-02 12:21:10,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:10,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2021-05-02 12:21:10,988 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2021-05-02 12:21:10,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:10,989 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2021-05-02 12:21:10,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 40 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:10,989 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2021-05-02 12:21:10,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 12:21:10,989 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:10,989 INFO L523 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:11,189 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 12:21:11,190 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:11,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:11,190 INFO L82 PathProgramCache]: Analyzing trace with hash -1697755146, now seen corresponding path program 37 times [2021-05-02 12:21:11,190 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:11,190 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689172271] [2021-05-02 12:21:11,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:11,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:11,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:11,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:11,953 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:11,953 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:11,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689172271] [2021-05-02 12:21:11,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1689172271] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:11,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656208374] [2021-05-02 12:21:11,953 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:11,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:11,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 12:21:11,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:12,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:12,092 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:12,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656208374] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:12,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:12,093 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-05-02 12:21:12,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525896406] [2021-05-02 12:21:12,093 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 12:21:12,093 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:12,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 12:21:12,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:21:12,093 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand has 42 states, 42 states have (on average 1.119047619047619) internal successors, (47), 41 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:13,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:13,929 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2021-05-02 12:21:13,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 12:21:13,930 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.119047619047619) internal successors, (47), 41 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2021-05-02 12:21:13,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:13,931 INFO L225 Difference]: With dead ends: 55 [2021-05-02 12:21:13,931 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 12:21:13,932 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 706 ImplicationChecksByTransitivity, 1998.4ms TimeCoverageRelationStatistics Valid=309, Invalid=6011, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 12:21:13,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 12:21:13,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-02 12:21:13,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0222222222222221) internal successors, (46), 45 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:13,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2021-05-02 12:21:13,935 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2021-05-02 12:21:13,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:13,935 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2021-05-02 12:21:13,935 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.119047619047619) internal successors, (47), 41 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:13,935 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2021-05-02 12:21:13,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 12:21:13,935 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:13,935 INFO L523 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:14,145 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 12:21:14,146 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:14,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:14,146 INFO L82 PathProgramCache]: Analyzing trace with hash -1054340708, now seen corresponding path program 38 times [2021-05-02 12:21:14,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:14,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598854459] [2021-05-02 12:21:14,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:14,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:14,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:14,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:14,984 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:14,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:14,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598854459] [2021-05-02 12:21:14,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1598854459] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:14,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075806143] [2021-05-02 12:21:14,984 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:15,038 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:21:15,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:15,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 79 conjunts are in the unsatisfiable core [2021-05-02 12:21:15,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:15,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:15,142 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:15,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075806143] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:15,142 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:15,143 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41] total 43 [2021-05-02 12:21:15,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425363620] [2021-05-02 12:21:15,143 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 12:21:15,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:15,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 12:21:15,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 12:21:15,143 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand has 43 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 42 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:17,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:17,081 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2021-05-02 12:21:17,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 12:21:17,081 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 42 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 12:21:17,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:17,082 INFO L225 Difference]: With dead ends: 56 [2021-05-02 12:21:17,082 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 12:21:17,082 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 744 ImplicationChecksByTransitivity, 2133.6ms TimeCoverageRelationStatistics Valid=317, Invalid=6325, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 12:21:17,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 12:21:17,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-02 12:21:17,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:17,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2021-05-02 12:21:17,085 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2021-05-02 12:21:17,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:17,085 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2021-05-02 12:21:17,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 42 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:17,085 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2021-05-02 12:21:17,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 12:21:17,085 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:17,086 INFO L523 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:17,289 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 12:21:17,289 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:17,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:17,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1711637686, now seen corresponding path program 39 times [2021-05-02 12:21:17,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:17,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190387324] [2021-05-02 12:21:17,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:17,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:18,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:18,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:18,150 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:18,150 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:18,150 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190387324] [2021-05-02 12:21:18,151 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [190387324] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:18,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505064150] [2021-05-02 12:21:18,151 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:18,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-05-02 12:21:18,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:18,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 12:21:18,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:18,880 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:18,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [505064150] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:18,881 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:18,881 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 12:21:18,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232432373] [2021-05-02 12:21:18,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 12:21:18,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:18,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 12:21:18,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:21:18,881 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 44 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 43 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:20,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:20,962 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2021-05-02 12:21:20,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 12:21:20,963 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 43 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 12:21:20,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:20,963 INFO L225 Difference]: With dead ends: 57 [2021-05-02 12:21:20,963 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 12:21:20,963 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 785 ImplicationChecksByTransitivity, 2243.6ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 12:21:20,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 12:21:20,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 12:21:20,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0212765957446808) internal successors, (48), 47 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:20,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2021-05-02 12:21:20,966 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2021-05-02 12:21:20,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:20,966 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2021-05-02 12:21:20,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 43 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:20,967 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2021-05-02 12:21:20,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 12:21:20,967 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:20,967 INFO L523 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:21,170 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:21,170 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:21,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:21,171 INFO L82 PathProgramCache]: Analyzing trace with hash 1557621980, now seen corresponding path program 40 times [2021-05-02 12:21:21,171 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:21,171 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871279810] [2021-05-02 12:21:21,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:21,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:22,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:22,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:22,089 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:22,090 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:22,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871279810] [2021-05-02 12:21:22,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871279810] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:22,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190483603] [2021-05-02 12:21:22,090 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:22,132 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:21:22,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:22,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-02 12:21:22,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:22,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:22,250 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:22,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190483603] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:22,250 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:22,250 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43] total 45 [2021-05-02 12:21:22,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772757584] [2021-05-02 12:21:22,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 12:21:22,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:22,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 12:21:22,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 12:21:22,251 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand has 45 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 44 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:24,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:24,424 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2021-05-02 12:21:24,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 12:21:24,425 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 44 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 12:21:24,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:24,425 INFO L225 Difference]: With dead ends: 58 [2021-05-02 12:21:24,425 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 12:21:24,426 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 823 ImplicationChecksByTransitivity, 2379.6ms TimeCoverageRelationStatistics Valid=333, Invalid=6977, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 12:21:24,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 12:21:24,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-02 12:21:24,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 48 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:24,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2021-05-02 12:21:24,433 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2021-05-02 12:21:24,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:24,433 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2021-05-02 12:21:24,433 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 44 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:24,433 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2021-05-02 12:21:24,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 12:21:24,434 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:24,434 INFO L523 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:24,634 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:24,634 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:24,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:24,635 INFO L82 PathProgramCache]: Analyzing trace with hash 1078102390, now seen corresponding path program 41 times [2021-05-02 12:21:24,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:24,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770570146] [2021-05-02 12:21:24,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:24,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:25,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:25,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:25,518 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:25,518 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:25,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770570146] [2021-05-02 12:21:25,518 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1770570146] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:25,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403372723] [2021-05-02 12:21:25,518 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:23:23,560 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2021-05-02 12:23:23,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:23:23,587 WARN L261 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 123 conjunts are in the unsatisfiable core [2021-05-02 12:23:23,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:23:24,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:24,470 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:24,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403372723] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:24,470 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:23:24,470 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-05-02 12:23:24,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061886085] [2021-05-02 12:23:24,470 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 12:23:24,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:23:24,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 12:23:24,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:23:24,471 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand has 46 states, 46 states have (on average 1.108695652173913) internal successors, (51), 45 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:26,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:23:26,666 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2021-05-02 12:23:26,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 12:23:26,666 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.108695652173913) internal successors, (51), 45 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-02 12:23:26,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:23:26,667 INFO L225 Difference]: With dead ends: 59 [2021-05-02 12:23:26,667 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 12:23:26,667 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 15 SyntacticMatches, 39 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 940 ImplicationChecksByTransitivity, 3062.1ms TimeCoverageRelationStatistics Valid=341, Invalid=7315, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 12:23:26,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 12:23:26,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-02 12:23:26,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.0204081632653061) internal successors, (50), 49 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:26,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2021-05-02 12:23:26,670 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2021-05-02 12:23:26,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:23:26,670 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2021-05-02 12:23:26,670 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.108695652173913) internal successors, (51), 45 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:26,671 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2021-05-02 12:23:26,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 12:23:26,671 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:23:26,671 INFO L523 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:23:26,878 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 12:23:26,878 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:23:26,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:23:26,879 INFO L82 PathProgramCache]: Analyzing trace with hash -902103012, now seen corresponding path program 42 times [2021-05-02 12:23:26,879 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:23:26,879 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149202774] [2021-05-02 12:23:26,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:23:26,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:27,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:23:27,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:27,821 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:27,821 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:23:27,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149202774] [2021-05-02 12:23:27,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149202774] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:27,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133111529] [2021-05-02 12:23:27,821 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:23:34,029 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2021-05-02 12:23:34,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:23:34,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 12:23:34,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:23:34,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:34,304 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:34,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2133111529] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:34,304 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:23:34,304 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 12:23:34,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208003845] [2021-05-02 12:23:34,305 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 12:23:34,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:23:34,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 12:23:34,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:23:34,305 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand has 47 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 46 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:36,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:23:36,590 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2021-05-02 12:23:36,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 12:23:36,590 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 46 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 12:23:36,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:23:36,591 INFO L225 Difference]: With dead ends: 60 [2021-05-02 12:23:36,591 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 12:23:36,591 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 48 SyntacticMatches, 7 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 918 ImplicationChecksByTransitivity, 2591.0ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 12:23:36,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 12:23:36,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 12:23:36,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:36,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2021-05-02 12:23:36,594 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2021-05-02 12:23:36,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:23:36,594 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2021-05-02 12:23:36,594 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 46 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:36,594 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2021-05-02 12:23:36,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 12:23:36,595 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:23:36,595 INFO L523 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:23:36,795 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:23:36,795 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:23:36,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:23:36,796 INFO L82 PathProgramCache]: Analyzing trace with hash 2136038966, now seen corresponding path program 43 times [2021-05-02 12:23:36,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:23:36,796 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332430116] [2021-05-02 12:23:36,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:23:36,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:37,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:23:37,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:37,741 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:37,741 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:23:37,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332430116] [2021-05-02 12:23:37,741 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1332430116] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:37,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762667979] [2021-05-02 12:23:37,741 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:23:37,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:37,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 12:23:37,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:23:37,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:37,889 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:37,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762667979] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:37,890 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:23:37,890 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-02 12:23:37,890 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354920374] [2021-05-02 12:23:37,890 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 12:23:37,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:23:37,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 12:23:37,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 12:23:37,890 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand has 48 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 47 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:40,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:23:40,248 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2021-05-02 12:23:40,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 12:23:40,249 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 47 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-02 12:23:40,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:23:40,249 INFO L225 Difference]: With dead ends: 61 [2021-05-02 12:23:40,249 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 12:23:40,249 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 2478.3ms TimeCoverageRelationStatistics Valid=357, Invalid=8015, Unknown=0, NotChecked=0, Total=8372 [2021-05-02 12:23:40,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 12:23:40,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 12:23:40,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0196078431372548) internal successors, (52), 51 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:40,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2021-05-02 12:23:40,252 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2021-05-02 12:23:40,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:23:40,252 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2021-05-02 12:23:40,253 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 47 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:40,253 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2021-05-02 12:23:40,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 12:23:40,253 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:23:40,253 INFO L523 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:23:40,455 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:23:40,455 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:23:40,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:23:40,455 INFO L82 PathProgramCache]: Analyzing trace with hash 1829159772, now seen corresponding path program 44 times [2021-05-02 12:23:40,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:23:40,455 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134249592] [2021-05-02 12:23:40,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:23:40,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:41,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:23:41,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:41,426 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:41,426 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:23:41,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134249592] [2021-05-02 12:23:41,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134249592] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:41,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235732505] [2021-05-02 12:23:41,426 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:23:41,464 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:23:41,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:23:41,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 12:23:41,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:23:41,577 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:41,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [235732505] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:41,578 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:23:41,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 12:23:41,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152773812] [2021-05-02 12:23:41,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 12:23:41,578 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:23:41,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 12:23:41,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:23:41,579 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:44,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:23:44,045 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2021-05-02 12:23:44,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 12:23:44,046 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 12:23:44,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:23:44,046 INFO L225 Difference]: With dead ends: 62 [2021-05-02 12:23:44,046 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 12:23:44,046 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 993 ImplicationChecksByTransitivity, 2560.0ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 12:23:44,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 12:23:44,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-05-02 12:23:44,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0192307692307692) internal successors, (53), 52 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:44,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2021-05-02 12:23:44,049 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2021-05-02 12:23:44,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:23:44,050 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2021-05-02 12:23:44,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:44,050 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2021-05-02 12:23:44,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 12:23:44,050 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:23:44,050 INFO L523 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:23:44,256 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 12:23:44,257 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:23:44,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:23:44,257 INFO L82 PathProgramCache]: Analyzing trace with hash 905839350, now seen corresponding path program 45 times [2021-05-02 12:23:44,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:23:44,257 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632586122] [2021-05-02 12:23:44,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:23:44,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:45,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:23:45,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:45,277 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:45,277 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:23:45,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632586122] [2021-05-02 12:23:45,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632586122] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:45,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686586588] [2021-05-02 12:23:45,277 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:23:45,889 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-05-02 12:23:45,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:23:45,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 99 conjunts are in the unsatisfiable core [2021-05-02 12:23:45,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:23:46,006 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:46,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686586588] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:46,006 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:23:46,006 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 12:23:46,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493021308] [2021-05-02 12:23:46,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 12:23:46,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:23:46,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 12:23:46,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:23:46,007 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand has 50 states, 50 states have (on average 1.1) internal successors, (55), 49 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:48,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:23:48,597 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2021-05-02 12:23:48,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 12:23:48,597 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.1) internal successors, (55), 49 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-02 12:23:48,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:23:48,598 INFO L225 Difference]: With dead ends: 63 [2021-05-02 12:23:48,598 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 12:23:48,598 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1038 ImplicationChecksByTransitivity, 2678.0ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 12:23:48,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 12:23:48,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-02 12:23:48,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0188679245283019) internal successors, (54), 53 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:48,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2021-05-02 12:23:48,601 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2021-05-02 12:23:48,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:23:48,601 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2021-05-02 12:23:48,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.1) internal successors, (55), 49 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:48,602 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2021-05-02 12:23:48,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 12:23:48,602 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:23:48,602 INFO L523 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:23:48,802 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 12:23:48,802 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:23:48,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:23:48,803 INFO L82 PathProgramCache]: Analyzing trace with hash -1947289956, now seen corresponding path program 46 times [2021-05-02 12:23:48,803 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:23:48,803 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009158348] [2021-05-02 12:23:48,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:23:48,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:49,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:23:49,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:49,865 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:49,865 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:23:49,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009158348] [2021-05-02 12:23:49,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009158348] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:49,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597289673] [2021-05-02 12:23:49,865 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:23:49,904 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:23:49,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:23:49,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 95 conjunts are in the unsatisfiable core [2021-05-02 12:23:49,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:23:50,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:50,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:50,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597289673] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:50,027 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:23:50,027 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49] total 51 [2021-05-02 12:23:50,027 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741394738] [2021-05-02 12:23:50,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 12:23:50,027 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:23:50,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 12:23:50,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 12:23:50,027 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand has 51 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 50 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:52,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:23:52,684 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2021-05-02 12:23:52,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 12:23:52,685 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 50 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 12:23:52,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:23:52,685 INFO L225 Difference]: With dead ends: 64 [2021-05-02 12:23:52,685 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 12:23:52,686 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1084 ImplicationChecksByTransitivity, 2756.7ms TimeCoverageRelationStatistics Valid=381, Invalid=9125, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 12:23:52,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 12:23:52,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-05-02 12:23:52,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0185185185185186) internal successors, (55), 54 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:52,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2021-05-02 12:23:52,689 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2021-05-02 12:23:52,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:23:52,689 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2021-05-02 12:23:52,689 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 50 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:52,689 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2021-05-02 12:23:52,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 12:23:52,689 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:23:52,689 INFO L523 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:23:52,904 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 12:23:52,904 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:23:52,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:23:52,905 INFO L82 PathProgramCache]: Analyzing trace with hash -199985226, now seen corresponding path program 47 times [2021-05-02 12:23:52,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:23:52,905 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129337740] [2021-05-02 12:23:52,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:23:52,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:54,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:23:54,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:54,012 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:54,012 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:23:54,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129337740] [2021-05-02 12:23:54,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129337740] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:54,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1224654768] [2021-05-02 12:23:54,013 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:28:36,401 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 12:28:36,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:28:36,427 WARN L261 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 143 conjunts are in the unsatisfiable core [2021-05-02 12:28:36,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:28:37,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:28:37,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:28:37,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1224654768] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:28:37,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:28:37,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 12:28:37,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002522862] [2021-05-02 12:28:37,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 12:28:37,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:28:37,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 12:28:37,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:28:37,615 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand has 52 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 51 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:40,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:28:40,422 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2021-05-02 12:28:40,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 12:28:40,422 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 51 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-02 12:28:40,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:28:40,423 INFO L225 Difference]: With dead ends: 65 [2021-05-02 12:28:40,423 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 12:28:40,423 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 13 SyntacticMatches, 47 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1223 ImplicationChecksByTransitivity, 3930.9ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 12:28:40,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 12:28:40,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-02 12:28:40,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.018181818181818) internal successors, (56), 55 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:40,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2021-05-02 12:28:40,427 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2021-05-02 12:28:40,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:28:40,427 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2021-05-02 12:28:40,427 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 51 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:40,427 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2021-05-02 12:28:40,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 12:28:40,427 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:28:40,427 INFO L523 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:28:40,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:28:40,633 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:28:40,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:28:40,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1868113444, now seen corresponding path program 48 times [2021-05-02 12:28:40,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:28:40,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040647412] [2021-05-02 12:28:40,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:28:40,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:28:41,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:28:41,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:28:41,786 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:28:41,786 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:28:41,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040647412] [2021-05-02 12:28:41,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040647412] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:28:41,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834365803] [2021-05-02 12:28:41,786 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:28:51,532 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 12:28:51,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:28:51,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-02 12:28:51,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:28:51,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:28:51,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834365803] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:28:51,722 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:28:51,722 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 12:28:51,722 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26241284] [2021-05-02 12:28:51,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 12:28:51,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:28:51,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 12:28:51,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 12:28:51,723 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand has 53 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 52 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:54,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:28:54,968 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2021-05-02 12:28:54,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 12:28:54,968 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 52 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 12:28:54,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:28:54,969 INFO L225 Difference]: With dead ends: 66 [2021-05-02 12:28:54,969 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 12:28:54,969 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 58 SyntacticMatches, 3 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 3255.8ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 12:28:54,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 12:28:54,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-02 12:28:54,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0178571428571428) internal successors, (57), 56 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:54,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2021-05-02 12:28:54,972 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 59 [2021-05-02 12:28:54,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:28:54,973 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2021-05-02 12:28:54,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 52 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:54,973 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2021-05-02 12:28:54,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 12:28:54,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:28:54,973 INFO L523 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:28:55,178 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 12:28:55,178 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:28:55,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:28:55,178 INFO L82 PathProgramCache]: Analyzing trace with hash -2040480650, now seen corresponding path program 49 times [2021-05-02 12:28:55,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:28:55,179 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663830819] [2021-05-02 12:28:55,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:28:55,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:28:56,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:28:56,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:28:56,517 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:28:56,517 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:28:56,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663830819] [2021-05-02 12:28:56,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663830819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:28:56,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1450482299] [2021-05-02 12:28:56,517 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:28:56,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:28:56,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 12:28:56,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:28:56,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:28:56,701 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:28:56,701 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1450482299] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:28:56,701 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:28:56,701 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-05-02 12:28:56,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963138295] [2021-05-02 12:28:56,701 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 12:28:56,701 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:28:56,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 12:28:56,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 12:28:56,702 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand has 54 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 53 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:00,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:29:00,083 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2021-05-02 12:29:00,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 12:29:00,083 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 53 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2021-05-02 12:29:00,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:29:00,083 INFO L225 Difference]: With dead ends: 67 [2021-05-02 12:29:00,084 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 12:29:00,084 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1228 ImplicationChecksByTransitivity, 3459.6ms TimeCoverageRelationStatistics Valid=405, Invalid=10307, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 12:29:00,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 12:29:00,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-05-02 12:29:00,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.0175438596491229) internal successors, (58), 57 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:00,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2021-05-02 12:29:00,087 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 60 [2021-05-02 12:29:00,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:29:00,087 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2021-05-02 12:29:00,087 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 53 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:00,088 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2021-05-02 12:29:00,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 12:29:00,088 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:29:00,088 INFO L523 BasicCegarLoop]: trace histogram [50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:29:00,288 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:29:00,288 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:29:00,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:29:00,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1206070556, now seen corresponding path program 50 times [2021-05-02 12:29:00,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:29:00,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001157591] [2021-05-02 12:29:00,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:29:00,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:01,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:29:01,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:01,628 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:29:01,628 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:29:01,628 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001157591] [2021-05-02 12:29:01,628 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1001157591] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:01,628 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094968479] [2021-05-02 12:29:01,629 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:29:01,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:29:01,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:29:01,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 12:29:01,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:29:01,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:29:01,814 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:29:01,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094968479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:01,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:29:01,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53] total 55 [2021-05-02 12:29:01,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842196613] [2021-05-02 12:29:01,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 12:29:01,814 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:29:01,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 12:29:01,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 12:29:01,815 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand has 55 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 54 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:04,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:29:04,901 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2021-05-02 12:29:04,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 12:29:04,902 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 54 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-02 12:29:04,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:29:04,902 INFO L225 Difference]: With dead ends: 68 [2021-05-02 12:29:04,902 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 12:29:04,903 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1278 ImplicationChecksByTransitivity, 3301.3ms TimeCoverageRelationStatistics Valid=413, Invalid=10717, Unknown=0, NotChecked=0, Total=11130 [2021-05-02 12:29:04,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 12:29:04,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-02 12:29:04,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0172413793103448) internal successors, (59), 58 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:04,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2021-05-02 12:29:04,906 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 61 [2021-05-02 12:29:04,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:29:04,906 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2021-05-02 12:29:04,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 54 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:04,906 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2021-05-02 12:29:04,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 12:29:04,906 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:29:04,906 INFO L523 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:29:05,107 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:29:05,107 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:29:05,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:29:05,107 INFO L82 PathProgramCache]: Analyzing trace with hash -1230057162, now seen corresponding path program 51 times [2021-05-02 12:29:05,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:29:05,107 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734889453] [2021-05-02 12:29:05,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:29:05,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:06,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:29:06,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:06,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:29:06,403 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:29:06,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734889453] [2021-05-02 12:29:06,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734889453] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:06,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104298208] [2021-05-02 12:29:06,403 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:29:06,932 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2021-05-02 12:29:06,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:29:06,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 105 conjunts are in the unsatisfiable core [2021-05-02 12:29:06,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:29:07,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:29:07,064 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:29:07,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104298208] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:07,064 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:29:07,064 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-02 12:29:07,064 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554445110] [2021-05-02 12:29:07,064 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 12:29:07,064 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:29:07,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 12:29:07,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:29:07,065 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand has 56 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 55 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:10,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:29:10,246 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2021-05-02 12:29:10,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 12:29:10,246 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 55 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 12:29:10,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:29:10,246 INFO L225 Difference]: With dead ends: 69 [2021-05-02 12:29:10,246 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 12:29:10,247 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1329 ImplicationChecksByTransitivity, 3306.6ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 12:29:10,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 12:29:10,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-02 12:29:10,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0169491525423728) internal successors, (60), 59 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:10,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2021-05-02 12:29:10,250 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 62 [2021-05-02 12:29:10,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:29:10,251 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2021-05-02 12:29:10,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 55 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:10,251 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2021-05-02 12:29:10,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 12:29:10,251 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:29:10,251 INFO L523 BasicCegarLoop]: trace histogram [52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:29:10,454 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 12:29:10,454 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:29:10,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:29:10,454 INFO L82 PathProgramCache]: Analyzing trace with hash 559394908, now seen corresponding path program 52 times [2021-05-02 12:29:10,454 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:29:10,454 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093649341] [2021-05-02 12:29:10,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:29:10,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:11,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:29:11,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:11,795 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:29:11,795 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:29:11,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093649341] [2021-05-02 12:29:11,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093649341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:11,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28117918] [2021-05-02 12:29:11,795 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:29:11,839 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:29:11,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:29:11,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-02 12:29:11,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:29:11,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:29:11,972 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:29:11,972 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28117918] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:11,972 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:29:11,972 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55] total 57 [2021-05-02 12:29:11,972 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572704631] [2021-05-02 12:29:11,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 12:29:11,972 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:29:11,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 12:29:11,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3028, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 12:29:11,973 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand has 57 states, 57 states have (on average 1.087719298245614) internal successors, (62), 56 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:15,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:29:15,269 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2021-05-02 12:29:15,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 12:29:15,270 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.087719298245614) internal successors, (62), 56 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-02 12:29:15,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:29:15,270 INFO L225 Difference]: With dead ends: 70 [2021-05-02 12:29:15,270 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 12:29:15,271 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1381 ImplicationChecksByTransitivity, 3414.3ms TimeCoverageRelationStatistics Valid=429, Invalid=11561, Unknown=0, NotChecked=0, Total=11990 [2021-05-02 12:29:15,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 12:29:15,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-02 12:29:15,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.0166666666666666) internal successors, (61), 60 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:15,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2021-05-02 12:29:15,274 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 63 [2021-05-02 12:29:15,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:29:15,274 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2021-05-02 12:29:15,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 1.087719298245614) internal successors, (62), 56 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:15,274 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2021-05-02 12:29:15,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-02 12:29:15,275 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:29:15,275 INFO L523 BasicCegarLoop]: trace histogram [53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:29:15,475 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:29:15,475 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:29:15,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:29:15,475 INFO L82 PathProgramCache]: Analyzing trace with hash 197834230, now seen corresponding path program 53 times [2021-05-02 12:29:15,476 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:29:15,476 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894118316] [2021-05-02 12:29:15,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:29:15,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:16,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:29:16,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:16,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:29:16,960 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:29:16,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894118316] [2021-05-02 12:29:16,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1894118316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:16,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997958332] [2021-05-02 12:29:16,960 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:33:17,588 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2021-05-02 12:33:17,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:33:17,614 WARN L261 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 154 conjunts are in the unsatisfiable core [2021-05-02 12:33:17,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:33:19,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:33:19,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:33:19,073 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997958332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:33:19,073 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:33:19,073 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56] total 58 [2021-05-02 12:33:19,073 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70702759] [2021-05-02 12:33:19,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 12:33:19,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:33:19,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 12:33:19,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3139, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 12:33:19,074 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand has 58 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 57 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:33:22,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:33:22,640 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2021-05-02 12:33:22,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 12:33:22,640 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 57 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 64 [2021-05-02 12:33:22,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:33:22,641 INFO L225 Difference]: With dead ends: 71 [2021-05-02 12:33:22,641 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 12:33:22,642 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 20 SyntacticMatches, 46 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1524 ImplicationChecksByTransitivity, 5006.0ms TimeCoverageRelationStatistics Valid=437, Invalid=11995, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 12:33:22,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 12:33:22,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-05-02 12:33:22,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.0163934426229508) internal successors, (62), 61 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:33:22,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2021-05-02 12:33:22,645 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 64 [2021-05-02 12:33:22,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:33:22,645 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2021-05-02 12:33:22,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 57 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:33:22,645 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2021-05-02 12:33:22,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 12:33:22,646 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:33:22,646 INFO L523 BasicCegarLoop]: trace histogram [54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:33:22,846 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 12:33:22,847 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:33:22,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:33:22,847 INFO L82 PathProgramCache]: Analyzing trace with hash 1874355100, now seen corresponding path program 54 times [2021-05-02 12:33:22,847 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:33:22,847 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691882415] [2021-05-02 12:33:22,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:33:22,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:33:24,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:33:24,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:33:24,321 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:33:24,321 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:33:24,321 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691882415] [2021-05-02 12:33:24,321 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1691882415] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:33:24,321 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898979101] [2021-05-02 12:33:24,321 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true