/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-crafted/simple_array_index_value_1-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:19:28,207 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:19:28,210 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:19:28,248 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:19:28,270 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:19:28,271 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:19:28,272 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:19:28,272 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:19:28,273 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:19:28,273 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:19:28,275 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:19:28,276 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:19:28,277 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:19:28,280 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:19:28,283 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:19:28,286 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:19:28,292 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:19:28,302 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:19:28,303 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:19:28,304 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:19:28,307 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 12:19:28,336 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:19:28,336 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:19:28,339 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:19:28,339 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:19:28,339 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:19:28,340 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:19:28,340 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:19:28,340 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:19:28,340 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:19:28,340 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:19:28,341 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:19:28,341 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:19:28,341 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:19:28,341 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:19:28,341 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:19:28,342 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:19:28,342 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:19:28,342 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:19:28,342 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:19:28,342 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:19:28,342 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:19:28,343 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:19:28,343 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:19:28,343 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:19:28,343 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:19:28,343 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:19:28,343 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:19:28,343 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:19:28,344 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:19:28,615 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:19:28,631 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:19:28,633 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:19:28,634 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:19:28,635 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:19:28,635 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_1-1.i [2021-05-02 12:19:28,697 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/67b0336d7/62352ee8107a41b8b3373d0bdf67ee6a/FLAGf3da1e2fe [2021-05-02 12:19:29,152 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:19:29,154 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_1-1.i [2021-05-02 12:19:29,159 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/67b0336d7/62352ee8107a41b8b3373d0bdf67ee6a/FLAGf3da1e2fe [2021-05-02 12:19:29,172 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/67b0336d7/62352ee8107a41b8b3373d0bdf67ee6a [2021-05-02 12:19:29,174 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:19:29,175 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:19:29,177 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:19:29,177 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:19:29,179 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:19:29,180 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:19:29" (1/1) ... [2021-05-02 12:19:29,181 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5744bfb5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:29, skipping insertion in model container [2021-05-02 12:19:29,181 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:19:29" (1/1) ... [2021-05-02 12:19:29,187 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:19:29,197 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:19:29,303 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-crafted/simple_array_index_value_1-1.i[834,847] [2021-05-02 12:19:29,313 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:19:29,319 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:19:29,329 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-crafted/simple_array_index_value_1-1.i[834,847] [2021-05-02 12:19:29,334 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:19:29,345 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:19:29,345 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:29 WrapperNode [2021-05-02 12:19:29,345 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:19:29,346 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:19:29,346 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:19:29,347 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:19:29,382 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:29" (1/1) ... [2021-05-02 12:19:29,383 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:29" (1/1) ... [2021-05-02 12:19:29,403 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:29" (1/1) ... [2021-05-02 12:19:29,403 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:29" (1/1) ... [2021-05-02 12:19:29,408 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:29" (1/1) ... [2021-05-02 12:19:29,412 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:29" (1/1) ... [2021-05-02 12:19:29,413 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:29" (1/1) ... [2021-05-02 12:19:29,415 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:19:29,416 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:19:29,416 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:19:29,416 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:19:29,417 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:29" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:19:29,485 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:19:29,485 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:19:29,485 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:19:29,486 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:19:29,486 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:19:29,486 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:19:29,487 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:19:29,487 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 12:19:29,487 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 12:19:29,488 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:19:29,488 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:19:29,488 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:19:29,488 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:19:29,488 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:19:29,489 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:19:29,489 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:19:29,489 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:19:29,489 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:19:29,489 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:19:29,781 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:19:29,781 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 12:19:29,782 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:19:29 BoogieIcfgContainer [2021-05-02 12:19:29,782 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:19:29,783 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:19:29,783 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:19:29,792 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:19:29,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:19:29" (1/3) ... [2021-05-02 12:19:29,793 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@627b83c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:19:29, skipping insertion in model container [2021-05-02 12:19:29,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:29" (2/3) ... [2021-05-02 12:19:29,794 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@627b83c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:19:29, skipping insertion in model container [2021-05-02 12:19:29,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:19:29" (3/3) ... [2021-05-02 12:19:29,795 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_1-1.i [2021-05-02 12:19:29,799 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:19:29,802 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:19:29,816 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:19:29,846 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:19:29,846 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:19:29,846 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:19:29,846 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:19:29,846 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:19:29,846 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:19:29,846 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:19:29,847 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:19:29,863 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 12:19:29,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:19:29,867 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:29,868 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:29,868 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:29,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:29,874 INFO L82 PathProgramCache]: Analyzing trace with hash 56847072, now seen corresponding path program 1 times [2021-05-02 12:19:29,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:29,882 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885218701] [2021-05-02 12:19:29,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:29,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:30,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:30,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:30,117 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 12:19:30,117 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:30,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885218701] [2021-05-02 12:19:30,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885218701] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:19:30,118 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:19:30,118 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 12:19:30,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900985553] [2021-05-02 12:19:30,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:19:30,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:30,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:19:30,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:19:30,134 INFO L87 Difference]: Start difference. First operand has 27 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 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 12:19:30,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:30,211 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2021-05-02 12:19:30,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:19:30,213 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 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 14 [2021-05-02 12:19:30,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:30,219 INFO L225 Difference]: With dead ends: 46 [2021-05-02 12:19:30,220 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 12:19:30,223 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 56.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:19:30,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 12:19:30,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 12:19:30,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:19:30,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-05-02 12:19:30,258 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2021-05-02 12:19:30,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:30,259 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-05-02 12:19:30,259 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 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 12:19:30,259 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-05-02 12:19:30,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:19:30,260 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:30,260 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:30,260 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:19:30,261 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:30,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:30,262 INFO L82 PathProgramCache]: Analyzing trace with hash -1810080346, now seen corresponding path program 1 times [2021-05-02 12:19:30,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:30,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947495923] [2021-05-02 12:19:30,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:30,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:30,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:30,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:30,367 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 12:19:30,367 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:30,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947495923] [2021-05-02 12:19:30,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947495923] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:19:30,368 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:19:30,368 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:19:30,368 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969084209] [2021-05-02 12:19:30,369 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:19:30,369 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:30,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:19:30,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:19:30,370 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 12:19:30,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:30,440 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2021-05-02 12:19:30,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:19:30,440 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 14 [2021-05-02 12:19:30,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:30,441 INFO L225 Difference]: With dead ends: 43 [2021-05-02 12:19:30,442 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 12:19:30,442 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.5ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:19:30,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 12:19:30,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2021-05-02 12:19:30,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:19:30,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-02 12:19:30,449 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 14 [2021-05-02 12:19:30,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:30,450 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-02 12:19:30,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 12:19:30,450 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-02 12:19:30,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 12:19:30,450 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:30,450 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:30,451 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:19:30,451 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:30,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:30,451 INFO L82 PathProgramCache]: Analyzing trace with hash -1733475192, now seen corresponding path program 1 times [2021-05-02 12:19:30,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:30,452 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771078753] [2021-05-02 12:19:30,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:30,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:30,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:30,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:30,545 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 12:19:30,546 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:30,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771078753] [2021-05-02 12:19:30,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771078753] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:30,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023142380] [2021-05-02 12:19:30,546 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 12:19:30,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:30,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:19:30,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:30,670 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 12:19:30,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1023142380] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:30,671 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:30,671 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 12:19:30,671 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204570520] [2021-05-02 12:19:30,672 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:19:30,672 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:30,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:19:30,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:19:30,673 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 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 12:19:30,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:30,795 INFO L93 Difference]: Finished difference Result 52 states and 61 transitions. [2021-05-02 12:19:30,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:19:30,797 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 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 12:19:30,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:30,799 INFO L225 Difference]: With dead ends: 52 [2021-05-02 12:19:30,799 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 12:19:30,800 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 50.5ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:19:30,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 12:19:30,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32. [2021-05-02 12:19:30,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 12:19:30,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-05-02 12:19:30,819 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 16 [2021-05-02 12:19:30,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:30,819 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-05-02 12:19:30,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 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 12:19:30,820 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-05-02 12:19:30,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 12:19:30,821 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:30,821 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:31,040 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 12:19:31,041 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:31,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:31,041 INFO L82 PathProgramCache]: Analyzing trace with hash -1130366230, now seen corresponding path program 2 times [2021-05-02 12:19:31,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:31,042 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203624492] [2021-05-02 12:19:31,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:31,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:31,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:31,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:31,182 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:31,182 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:31,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203624492] [2021-05-02 12:19:31,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203624492] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:31,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158531937] [2021-05-02 12:19:31,183 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 12:19:31,247 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:31,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:31,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 12:19:31,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:31,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:31,354 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:31,355 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [158531937] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:31,355 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:31,355 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:19:31,355 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166959687] [2021-05-02 12:19:31,356 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:19:31,356 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:31,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:19:31,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:19:31,357 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 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 12:19:31,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:31,535 INFO L93 Difference]: Finished difference Result 64 states and 75 transitions. [2021-05-02 12:19:31,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:19:31,535 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 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 12:19:31,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:31,536 INFO L225 Difference]: With dead ends: 64 [2021-05-02 12:19:31,536 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 12:19:31,537 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 67.2ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:19:31,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 12:19:31,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 39. [2021-05-02 12:19:31,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 12:19:31,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2021-05-02 12:19:31,543 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 18 [2021-05-02 12:19:31,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:31,543 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2021-05-02 12:19:31,543 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 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 12:19:31,543 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2021-05-02 12:19:31,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 12:19:31,544 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:31,544 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:31,762 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:31,762 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:31,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:31,763 INFO L82 PathProgramCache]: Analyzing trace with hash -1363238708, now seen corresponding path program 3 times [2021-05-02 12:19:31,763 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:31,763 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620598178] [2021-05-02 12:19:31,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:31,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:31,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:31,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:31,881 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:31,881 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:31,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620598178] [2021-05-02 12:19:31,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620598178] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:31,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332636177] [2021-05-02 12:19:31,881 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 12:19:31,952 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 12:19:31,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:31,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 12:19:31,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:32,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:32,057 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:32,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332636177] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:32,057 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:32,058 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:19:32,058 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837311283] [2021-05-02 12:19:32,061 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:19:32,061 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:32,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:19:32,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:19:32,062 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 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 12:19:32,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:32,227 INFO L93 Difference]: Finished difference Result 76 states and 89 transitions. [2021-05-02 12:19:32,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:19:32,228 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 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 12:19:32,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:32,229 INFO L225 Difference]: With dead ends: 76 [2021-05-02 12:19:32,229 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 12:19:32,230 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 68.9ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:19:32,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 12:19:32,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 46. [2021-05-02 12:19:32,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 7 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 12:19:32,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2021-05-02 12:19:32,248 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 20 [2021-05-02 12:19:32,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:32,248 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2021-05-02 12:19:32,248 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 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 12:19:32,248 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2021-05-02 12:19:32,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 12:19:32,249 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:32,249 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:32,449 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:32,449 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:32,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:32,450 INFO L82 PathProgramCache]: Analyzing trace with hash -1815390674, now seen corresponding path program 4 times [2021-05-02 12:19:32,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:32,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559569114] [2021-05-02 12:19:32,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:32,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:32,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:32,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:32,604 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:32,605 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:32,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559569114] [2021-05-02 12:19:32,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559569114] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:32,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146218804] [2021-05-02 12:19:32,605 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 12:19:32,655 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:32,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:32,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:19:32,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:32,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:32,744 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:32,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146218804] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:32,744 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:32,744 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 12:19:32,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343785912] [2021-05-02 12:19:32,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:19:32,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:32,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:19:32,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:19:32,747 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 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 12:19:32,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:32,939 INFO L93 Difference]: Finished difference Result 88 states and 103 transitions. [2021-05-02 12:19:32,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:19:32,941 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 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 12:19:32,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:32,943 INFO L225 Difference]: With dead ends: 88 [2021-05-02 12:19:32,944 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 12:19:32,944 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 84.1ms TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:19:32,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 12:19:32,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 53. [2021-05-02 12:19:32,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 12:19:32,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-05-02 12:19:32,958 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 22 [2021-05-02 12:19:32,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:32,958 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-05-02 12:19:32,959 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 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 12:19:32,959 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-05-02 12:19:32,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 12:19:32,959 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:32,959 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:33,181 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:33,182 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:33,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:33,182 INFO L82 PathProgramCache]: Analyzing trace with hash 1753234192, now seen corresponding path program 5 times [2021-05-02 12:19:33,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:33,183 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284658176] [2021-05-02 12:19:33,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:33,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:33,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:33,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:33,293 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:33,293 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:33,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284658176] [2021-05-02 12:19:33,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284658176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:33,294 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453710241] [2021-05-02 12:19:33,294 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 12:19:33,438 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 12:19:33,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:33,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 12:19:33,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:33,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:33,508 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:33,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1453710241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:33,509 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:33,509 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 12:19:33,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567188278] [2021-05-02 12:19:33,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:19:33,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:33,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:19:33,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:19:33,510 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 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 12:19:33,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:33,764 INFO L93 Difference]: Finished difference Result 100 states and 117 transitions. [2021-05-02 12:19:33,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:19:33,765 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 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 12:19:33,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:33,766 INFO L225 Difference]: With dead ends: 100 [2021-05-02 12:19:33,766 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 12:19:33,766 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 85.1ms TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:19:33,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 12:19:33,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 60. [2021-05-02 12:19:33,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 9 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 12:19:33,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2021-05-02 12:19:33,775 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 24 [2021-05-02 12:19:33,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:33,775 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2021-05-02 12:19:33,775 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 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 12:19:33,775 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2021-05-02 12:19:33,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 12:19:33,776 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:33,776 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:33,979 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 12:19:33,980 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:33,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:33,980 INFO L82 PathProgramCache]: Analyzing trace with hash -477139086, now seen corresponding path program 6 times [2021-05-02 12:19:33,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:33,980 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508413195] [2021-05-02 12:19:33,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:34,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:34,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:34,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:34,120 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 12:19:34,120 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:34,120 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508413195] [2021-05-02 12:19:34,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508413195] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:34,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [427679419] [2021-05-02 12:19:34,121 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 12:19:34,350 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:19:34,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:34,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 12:19:34,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:34,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:34,433 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 12:19:34,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [427679419] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:34,433 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:34,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:19:34,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725232366] [2021-05-02 12:19:34,434 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:19:34,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:34,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:19:34,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:19:34,435 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 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 12:19:34,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:34,697 INFO L93 Difference]: Finished difference Result 112 states and 131 transitions. [2021-05-02 12:19:34,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:19:34,698 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 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 12:19:34,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:34,698 INFO L225 Difference]: With dead ends: 112 [2021-05-02 12:19:34,698 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 12:19:34,699 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 87.4ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:19:34,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 12:19:34,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 67. [2021-05-02 12:19:34,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 10 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 12:19:34,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 76 transitions. [2021-05-02 12:19:34,705 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 76 transitions. Word has length 26 [2021-05-02 12:19:34,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:34,705 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 76 transitions. [2021-05-02 12:19:34,705 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 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 12:19:34,705 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 76 transitions. [2021-05-02 12:19:34,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 12:19:34,706 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:34,706 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:34,909 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:34,909 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:34,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:34,910 INFO L82 PathProgramCache]: Analyzing trace with hash -677178540, now seen corresponding path program 7 times [2021-05-02 12:19:34,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:34,910 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475832174] [2021-05-02 12:19:34,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:34,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:35,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:35,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:35,054 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:35,054 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:35,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475832174] [2021-05-02 12:19:35,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1475832174] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:35,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129558365] [2021-05-02 12:19:35,055 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 12:19:35,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:35,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 12:19:35,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:35,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:35,208 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:35,208 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2129558365] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:35,208 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:35,208 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:19:35,208 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571468534] [2021-05-02 12:19:35,209 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:19:35,209 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:35,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:19:35,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:19:35,210 INFO L87 Difference]: Start difference. First operand 67 states and 76 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 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 12:19:35,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:35,562 INFO L93 Difference]: Finished difference Result 124 states and 145 transitions. [2021-05-02 12:19:35,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:19:35,563 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 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 12:19:35,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:35,564 INFO L225 Difference]: With dead ends: 124 [2021-05-02 12:19:35,564 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 12:19:35,565 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 23 SyntacticMatches, 6 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 134.3ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:19:35,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 12:19:35,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 74. [2021-05-02 12:19:35,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 11 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 12:19:35,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 84 transitions. [2021-05-02 12:19:35,570 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 84 transitions. Word has length 28 [2021-05-02 12:19:35,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:35,571 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 84 transitions. [2021-05-02 12:19:35,571 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 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 12:19:35,571 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 84 transitions. [2021-05-02 12:19:35,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 12:19:35,571 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:35,572 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:35,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:35,788 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:35,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:35,788 INFO L82 PathProgramCache]: Analyzing trace with hash 358434486, now seen corresponding path program 8 times [2021-05-02 12:19:35,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:35,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307888654] [2021-05-02 12:19:35,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:35,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:35,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:35,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:35,976 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:35,976 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:35,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307888654] [2021-05-02 12:19:35,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307888654] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:35,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054919183] [2021-05-02 12:19:35,976 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 12:19:36,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:36,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:36,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 12:19:36,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:36,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:36,163 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:36,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2054919183] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:36,164 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:36,164 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:19:36,164 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971115017] [2021-05-02 12:19:36,164 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:19:36,164 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:36,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:19:36,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:19:36,165 INFO L87 Difference]: Start difference. First operand 74 states and 84 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 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 12:19:36,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:36,530 INFO L93 Difference]: Finished difference Result 136 states and 159 transitions. [2021-05-02 12:19:36,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:19:36,530 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 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 12:19:36,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:36,531 INFO L225 Difference]: With dead ends: 136 [2021-05-02 12:19:36,531 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 12:19:36,532 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 141.3ms TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:19:36,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 12:19:36,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 81. [2021-05-02 12:19:36,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 12 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 12:19:36,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 92 transitions. [2021-05-02 12:19:36,538 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 92 transitions. Word has length 30 [2021-05-02 12:19:36,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:36,538 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 92 transitions. [2021-05-02 12:19:36,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 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 12:19:36,538 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 92 transitions. [2021-05-02 12:19:36,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:19:36,539 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:36,539 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:36,761 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 12:19:36,761 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:36,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:36,762 INFO L82 PathProgramCache]: Analyzing trace with hash -849860200, now seen corresponding path program 9 times [2021-05-02 12:19:36,762 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:36,762 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013036755] [2021-05-02 12:19:36,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:36,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:36,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:36,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:36,952 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:36,953 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:36,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013036755] [2021-05-02 12:19:36,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013036755] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:36,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985364975] [2021-05-02 12:19:36,953 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 12:19:37,321 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 12:19:37,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:37,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 12:19:37,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:37,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:37,448 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:37,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1985364975] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:37,448 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:37,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:19:37,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19042357] [2021-05-02 12:19:37,449 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:19:37,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:37,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:19:37,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:19:37,451 INFO L87 Difference]: Start difference. First operand 81 states and 92 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 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 12:19:37,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:37,928 INFO L93 Difference]: Finished difference Result 148 states and 173 transitions. [2021-05-02 12:19:37,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:19:37,928 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 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 12:19:37,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:37,929 INFO L225 Difference]: With dead ends: 148 [2021-05-02 12:19:37,929 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 12:19:37,930 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 143.0ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:19:37,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 12:19:37,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 88. [2021-05-02 12:19:37,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 12:19:37,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 100 transitions. [2021-05-02 12:19:37,935 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 100 transitions. Word has length 32 [2021-05-02 12:19:37,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:37,936 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 100 transitions. [2021-05-02 12:19:37,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 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 12:19:37,936 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 100 transitions. [2021-05-02 12:19:37,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 12:19:37,937 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:37,937 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:38,142 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:38,142 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:38,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:38,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1915083770, now seen corresponding path program 10 times [2021-05-02 12:19:38,143 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:38,143 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941062762] [2021-05-02 12:19:38,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:38,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:38,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:38,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:38,317 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:38,317 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:38,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941062762] [2021-05-02 12:19:38,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941062762] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:38,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602450160] [2021-05-02 12:19:38,317 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 12:19:38,370 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:38,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:38,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:19:38,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:38,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:38,540 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:38,540 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602450160] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:38,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:38,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 12:19:38,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397991720] [2021-05-02 12:19:38,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:19:38,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:38,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:19:38,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:19:38,542 INFO L87 Difference]: Start difference. First operand 88 states and 100 transitions. Second operand has 15 states, 15 states have (on average 2.2) internal successors, (33), 14 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:39,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:39,072 INFO L93 Difference]: Finished difference Result 160 states and 187 transitions. [2021-05-02 12:19:39,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:19:39,072 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 14 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 12:19:39,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:39,073 INFO L225 Difference]: With dead ends: 160 [2021-05-02 12:19:39,073 INFO L226 Difference]: Without dead ends: 99 [2021-05-02 12:19:39,074 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 26 SyntacticMatches, 9 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 204.6ms TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:19:39,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-02 12:19:39,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 95. [2021-05-02 12:19:39,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 14 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 12:19:39,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 108 transitions. [2021-05-02 12:19:39,079 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 108 transitions. Word has length 34 [2021-05-02 12:19:39,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:39,079 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 108 transitions. [2021-05-02 12:19:39,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 14 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:39,079 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 108 transitions. [2021-05-02 12:19:39,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 12:19:39,080 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:39,080 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:39,292 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:39,293 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:39,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:39,293 INFO L82 PathProgramCache]: Analyzing trace with hash 441482716, now seen corresponding path program 11 times [2021-05-02 12:19:39,293 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:39,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1400394760] [2021-05-02 12:19:39,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:39,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:39,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:39,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:39,509 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:39,509 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:39,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1400394760] [2021-05-02 12:19:39,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1400394760] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:39,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425742571] [2021-05-02 12:19:39,509 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 12:19:42,452 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-02 12:19:42,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:42,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 12:19:42,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:42,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:42,568 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:42,569 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425742571] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:42,569 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:42,569 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 12:19:42,569 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944005834] [2021-05-02 12:19:42,569 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:19:42,569 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:42,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:19:42,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:19:42,570 INFO L87 Difference]: Start difference. First operand 95 states and 108 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 15 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 12:19:43,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:43,109 INFO L93 Difference]: Finished difference Result 172 states and 201 transitions. [2021-05-02 12:19:43,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:19:43,110 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 15 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 12:19:43,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:43,111 INFO L225 Difference]: With dead ends: 172 [2021-05-02 12:19:43,111 INFO L226 Difference]: Without dead ends: 106 [2021-05-02 12:19:43,112 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 170.1ms TimeCoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:19:43,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-05-02 12:19:43,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 102. [2021-05-02 12:19:43,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 15 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 12:19:43,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 116 transitions. [2021-05-02 12:19:43,117 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 116 transitions. Word has length 36 [2021-05-02 12:19:43,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:43,117 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 116 transitions. [2021-05-02 12:19:43,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 15 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 12:19:43,117 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 116 transitions. [2021-05-02 12:19:43,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:19:43,118 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:43,118 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:43,322 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 12:19:43,322 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:43,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:43,323 INFO L82 PathProgramCache]: Analyzing trace with hash 1650077502, now seen corresponding path program 12 times [2021-05-02 12:19:43,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:43,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903628381] [2021-05-02 12:19:43,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:43,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:43,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:43,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:43,550 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:43,550 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:43,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903628381] [2021-05-02 12:19:43,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1903628381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:43,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2000312355] [2021-05-02 12:19:43,551 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 12:19:47,214 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 12:19:47,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:47,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:19:47,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:47,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:47,336 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:47,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2000312355] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:47,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:47,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:19:47,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174603284] [2021-05-02 12:19:47,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:19:47,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:47,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:19:47,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:19:47,338 INFO L87 Difference]: Start difference. First operand 102 states and 116 transitions. Second operand has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 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 12:19:48,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:48,045 INFO L93 Difference]: Finished difference Result 184 states and 215 transitions. [2021-05-02 12:19:48,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:19:48,046 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 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 12:19:48,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:48,047 INFO L225 Difference]: With dead ends: 184 [2021-05-02 12:19:48,047 INFO L226 Difference]: Without dead ends: 113 [2021-05-02 12:19:48,047 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 205.0ms TimeCoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:19:48,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-02 12:19:48,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 109. [2021-05-02 12:19:48,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 states have internal predecessors, (93), 16 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 12:19:48,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 124 transitions. [2021-05-02 12:19:48,053 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 124 transitions. Word has length 38 [2021-05-02 12:19:48,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:48,053 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 124 transitions. [2021-05-02 12:19:48,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 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 12:19:48,053 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 124 transitions. [2021-05-02 12:19:48,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 12:19:48,054 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:48,054 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:48,260 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 12:19:48,260 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:48,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:48,261 INFO L82 PathProgramCache]: Analyzing trace with hash -826470368, now seen corresponding path program 13 times [2021-05-02 12:19:48,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:48,261 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2154124] [2021-05-02 12:19:48,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:48,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:48,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:48,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:48,521 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:48,522 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:48,522 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2154124] [2021-05-02 12:19:48,522 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2154124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:48,522 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094705873] [2021-05-02 12:19:48,522 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 12:19:48,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:48,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 12:19:48,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:48,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:48,770 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:48,771 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094705873] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:48,771 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:48,771 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 12:19:48,771 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456696880] [2021-05-02 12:19:48,772 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:19:48,772 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:48,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:19:48,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:19:48,773 INFO L87 Difference]: Start difference. First operand 109 states and 124 transitions. Second operand has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 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 12:19:49,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:49,516 INFO L93 Difference]: Finished difference Result 196 states and 229 transitions. [2021-05-02 12:19:49,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:19:49,516 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 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 12:19:49,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:49,517 INFO L225 Difference]: With dead ends: 196 [2021-05-02 12:19:49,517 INFO L226 Difference]: Without dead ends: 120 [2021-05-02 12:19:49,518 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 31 SyntacticMatches, 10 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 270.7ms TimeCoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:19:49,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-02 12:19:49,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 116. [2021-05-02 12:19:49,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 17 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 12:19:49,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 132 transitions. [2021-05-02 12:19:49,524 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 132 transitions. Word has length 40 [2021-05-02 12:19:49,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:49,524 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 132 transitions. [2021-05-02 12:19:49,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 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 12:19:49,524 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 132 transitions. [2021-05-02 12:19:49,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 12:19:49,525 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:49,525 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:49,732 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:19:49,733 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:49,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:49,733 INFO L82 PathProgramCache]: Analyzing trace with hash -1377091454, now seen corresponding path program 14 times [2021-05-02 12:19:49,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:49,733 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515728430] [2021-05-02 12:19:49,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:49,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:49,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:49,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:50,002 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:50,002 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:50,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515728430] [2021-05-02 12:19:50,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1515728430] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:50,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [54307526] [2021-05-02 12:19:50,002 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 12:19:50,056 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:50,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:50,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:19:50,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:50,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:50,240 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:50,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [54307526] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:50,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:50,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:19:50,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293223859] [2021-05-02 12:19:50,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:19:50,241 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:50,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:19:50,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:19:50,242 INFO L87 Difference]: Start difference. First operand 116 states and 132 transitions. Second operand has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 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 12:19:51,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:51,003 INFO L93 Difference]: Finished difference Result 208 states and 243 transitions. [2021-05-02 12:19:51,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:19:51,004 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 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 12:19:51,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:51,005 INFO L225 Difference]: With dead ends: 208 [2021-05-02 12:19:51,005 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 12:19:51,006 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 34 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 319.2ms TimeCoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:19:51,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 12:19:51,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 123. [2021-05-02 12:19:51,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 18 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-02 12:19:51,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 140 transitions. [2021-05-02 12:19:51,011 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 140 transitions. Word has length 42 [2021-05-02 12:19:51,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:51,011 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 140 transitions. [2021-05-02 12:19:51,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 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 12:19:51,011 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 140 transitions. [2021-05-02 12:19:51,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 12:19:51,012 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:51,012 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:51,233 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:51,234 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:51,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:51,234 INFO L82 PathProgramCache]: Analyzing trace with hash 2051989604, now seen corresponding path program 15 times [2021-05-02 12:19:51,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:51,234 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328985565] [2021-05-02 12:19:51,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:51,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:51,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:51,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:51,552 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:51,552 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:51,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328985565] [2021-05-02 12:19:51,552 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328985565] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:51,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188932115] [2021-05-02 12:19:51,552 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 12:19:55,310 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-02 12:19:55,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:55,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 12:19:55,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:55,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:55,429 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:55,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188932115] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:55,430 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:55,430 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:19:55,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571556384] [2021-05-02 12:19:55,431 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:19:55,431 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:55,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:19:55,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:19:55,432 INFO L87 Difference]: Start difference. First operand 123 states and 140 transitions. Second operand has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 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 12:19:56,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:56,284 INFO L93 Difference]: Finished difference Result 220 states and 257 transitions. [2021-05-02 12:19:56,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:19:56,284 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 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 12:19:56,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:56,285 INFO L225 Difference]: With dead ends: 220 [2021-05-02 12:19:56,285 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 12:19:56,287 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 264.2ms TimeCoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:19:56,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 12:19:56,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 130. [2021-05-02 12:19:56,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 19 states have call successors, (19), 3 states have call predecessors, (19), 2 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 12:19:56,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 148 transitions. [2021-05-02 12:19:56,293 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 148 transitions. Word has length 44 [2021-05-02 12:19:56,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:56,293 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 148 transitions. [2021-05-02 12:19:56,294 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 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 12:19:56,294 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 148 transitions. [2021-05-02 12:19:56,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 12:19:56,297 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:56,297 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:56,502 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 12:19:56,502 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:56,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:56,502 INFO L82 PathProgramCache]: Analyzing trace with hash -1135996986, now seen corresponding path program 16 times [2021-05-02 12:19:56,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:56,502 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1418844671] [2021-05-02 12:19:56,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:56,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:56,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:56,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:56,802 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:56,802 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:56,802 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1418844671] [2021-05-02 12:19:56,802 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1418844671] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:56,802 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193852443] [2021-05-02 12:19:56,802 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 12:19:56,852 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:56,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:56,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 12:19:56,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:57,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:57,148 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:57,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193852443] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:57,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:57,149 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:19:57,149 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287161899] [2021-05-02 12:19:57,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:19:57,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:57,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:19:57,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:19:57,150 INFO L87 Difference]: Start difference. First operand 130 states and 148 transitions. Second operand has 21 states, 21 states have (on average 2.142857142857143) internal successors, (45), 20 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 12:19:57,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:57,990 INFO L93 Difference]: Finished difference Result 232 states and 271 transitions. [2021-05-02 12:19:57,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:19:57,990 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.142857142857143) internal successors, (45), 20 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 12:19:57,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:57,991 INFO L225 Difference]: With dead ends: 232 [2021-05-02 12:19:57,991 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 12:19:57,992 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 31 SyntacticMatches, 16 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 410.7ms TimeCoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:19:57,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 12:19:57,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 137. [2021-05-02 12:19:57,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 114 states have internal predecessors, (117), 20 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 12:19:57,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 156 transitions. [2021-05-02 12:19:57,997 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 156 transitions. Word has length 46 [2021-05-02 12:19:57,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:57,997 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 156 transitions. [2021-05-02 12:19:57,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.142857142857143) internal successors, (45), 20 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 12:19:57,997 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 156 transitions. [2021-05-02 12:19:57,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 12:19:57,998 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:57,998 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:58,208 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 12:19:58,209 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:58,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:58,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1815539368, now seen corresponding path program 17 times [2021-05-02 12:19:58,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:58,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089322091] [2021-05-02 12:19:58,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:58,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:58,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:58,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:58,517 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:58,517 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:58,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089322091] [2021-05-02 12:19:58,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089322091] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:58,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321914049] [2021-05-02 12:19:58,517 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 12:20:32,803 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-05-02 12:20:32,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:32,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 12:20:32,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:32,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:32,926 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:32,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1321914049] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:32,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:32,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 12:20:32,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477280246] [2021-05-02 12:20:32,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:20:32,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:32,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:20:32,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:20:32,927 INFO L87 Difference]: Start difference. First operand 137 states and 156 transitions. Second operand has 22 states, 22 states have (on average 2.1363636363636362) internal successors, (47), 21 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 12:20:33,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:33,941 INFO L93 Difference]: Finished difference Result 244 states and 285 transitions. [2021-05-02 12:20:33,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:20:33,941 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1363636363636362) internal successors, (47), 21 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 12:20:33,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:33,942 INFO L225 Difference]: With dead ends: 244 [2021-05-02 12:20:33,942 INFO L226 Difference]: Without dead ends: 148 [2021-05-02 12:20:33,942 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 274.3ms TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:20:33,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-02 12:20:33,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 144. [2021-05-02 12:20:33,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 21 states have call successors, (21), 3 states have call predecessors, (21), 2 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-02 12:20:33,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 164 transitions. [2021-05-02 12:20:33,947 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 164 transitions. Word has length 48 [2021-05-02 12:20:33,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:33,947 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 164 transitions. [2021-05-02 12:20:33,947 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.1363636363636362) internal successors, (47), 21 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 12:20:33,947 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 164 transitions. [2021-05-02 12:20:33,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 12:20:33,948 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:33,948 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:34,155 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:34,156 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:34,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:34,156 INFO L82 PathProgramCache]: Analyzing trace with hash -731407094, now seen corresponding path program 18 times [2021-05-02 12:20:34,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:34,156 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654455307] [2021-05-02 12:20:34,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:34,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:34,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:34,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:34,501 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:34,501 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:34,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654455307] [2021-05-02 12:20:34,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654455307] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:34,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1836636547] [2021-05-02 12:20:34,501 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 12:21:02,614 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 12:21:02,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:02,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 12:21:02,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:02,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:02,784 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:02,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1836636547] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:02,785 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:02,785 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:21:02,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244419314] [2021-05-02 12:21:02,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:21:02,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:02,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:21:02,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:21:02,786 INFO L87 Difference]: Start difference. First operand 144 states and 164 transitions. Second operand has 23 states, 23 states have (on average 2.130434782608696) internal successors, (49), 22 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 12:21:03,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:03,864 INFO L93 Difference]: Finished difference Result 256 states and 299 transitions. [2021-05-02 12:21:03,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:21:03,864 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.130434782608696) internal successors, (49), 22 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 12:21:03,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:03,865 INFO L225 Difference]: With dead ends: 256 [2021-05-02 12:21:03,865 INFO L226 Difference]: Without dead ends: 155 [2021-05-02 12:21:03,866 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 330.8ms TimeCoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:21:03,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-02 12:21:03,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 151. [2021-05-02 12:21:03,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 22 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 12:21:03,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 172 transitions. [2021-05-02 12:21:03,871 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 172 transitions. Word has length 50 [2021-05-02 12:21:03,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:03,872 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 172 transitions. [2021-05-02 12:21:03,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.130434782608696) internal successors, (49), 22 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 12:21:03,872 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 172 transitions. [2021-05-02 12:21:03,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 12:21:03,872 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:03,872 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:04,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:04,077 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:04,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:04,077 INFO L82 PathProgramCache]: Analyzing trace with hash -215598356, now seen corresponding path program 19 times [2021-05-02 12:21:04,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:04,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118386914] [2021-05-02 12:21:04,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:04,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:04,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:04,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:04,417 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:04,417 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:04,418 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118386914] [2021-05-02 12:21:04,418 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118386914] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:04,418 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1545442899] [2021-05-02 12:21:04,418 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 12:21:04,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:04,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 12:21:04,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:04,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:04,785 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:04,785 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1545442899] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:04,785 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:04,785 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:21:04,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245104769] [2021-05-02 12:21:04,786 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:21:04,786 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:04,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:21:04,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:21:04,787 INFO L87 Difference]: Start difference. First operand 151 states and 172 transitions. Second operand has 24 states, 24 states have (on average 2.125) internal successors, (51), 23 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 12:21:05,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:05,953 INFO L93 Difference]: Finished difference Result 268 states and 313 transitions. [2021-05-02 12:21:05,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:21:05,954 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 23 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 12:21:05,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:05,955 INFO L225 Difference]: With dead ends: 268 [2021-05-02 12:21:05,955 INFO L226 Difference]: Without dead ends: 162 [2021-05-02 12:21:05,956 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 38 SyntacticMatches, 15 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 442.6ms TimeCoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:21:05,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-05-02 12:21:05,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 158. [2021-05-02 12:21:05,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 23 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-05-02 12:21:05,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 180 transitions. [2021-05-02 12:21:05,961 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 180 transitions. Word has length 52 [2021-05-02 12:21:05,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:05,962 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 180 transitions. [2021-05-02 12:21:05,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 23 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 12:21:05,962 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 180 transitions. [2021-05-02 12:21:05,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 12:21:05,962 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:05,962 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:06,175 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:06,175 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:06,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:06,176 INFO L82 PathProgramCache]: Analyzing trace with hash 1555359822, now seen corresponding path program 20 times [2021-05-02 12:21:06,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:06,176 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638623036] [2021-05-02 12:21:06,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:06,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:06,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:06,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:06,585 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:06,585 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:06,585 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638623036] [2021-05-02 12:21:06,585 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638623036] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:06,585 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013055226] [2021-05-02 12:21:06,585 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 12:21:06,643 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:21:06,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:06,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 12:21:06,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:06,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:06,938 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:06,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2013055226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:06,939 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:06,939 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:21:06,939 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893177127] [2021-05-02 12:21:06,939 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:21:06,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:06,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:21:06,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:21:06,940 INFO L87 Difference]: Start difference. First operand 158 states and 180 transitions. Second operand has 25 states, 25 states have (on average 2.12) internal successors, (53), 24 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:08,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:08,231 INFO L93 Difference]: Finished difference Result 280 states and 327 transitions. [2021-05-02 12:21:08,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:21:08,233 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.12) internal successors, (53), 24 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-02 12:21:08,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:08,234 INFO L225 Difference]: With dead ends: 280 [2021-05-02 12:21:08,234 INFO L226 Difference]: Without dead ends: 169 [2021-05-02 12:21:08,234 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 43 SyntacticMatches, 12 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 509.7ms TimeCoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:21:08,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-02 12:21:08,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 165. [2021-05-02 12:21:08,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 24 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-05-02 12:21:08,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 188 transitions. [2021-05-02 12:21:08,240 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 188 transitions. Word has length 54 [2021-05-02 12:21:08,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:08,240 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 188 transitions. [2021-05-02 12:21:08,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.12) internal successors, (53), 24 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:08,241 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 188 transitions. [2021-05-02 12:21:08,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 12:21:08,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:08,241 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:08,448 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 12:21:08,449 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:08,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:08,449 INFO L82 PathProgramCache]: Analyzing trace with hash -1655847632, now seen corresponding path program 21 times [2021-05-02 12:21:08,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:08,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533519923] [2021-05-02 12:21:08,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:08,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:08,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:08,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:08,845 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:08,845 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:08,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [533519923] [2021-05-02 12:21:08,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [533519923] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:08,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77050005] [2021-05-02 12:21:08,845 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 12:21:52,540 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-02 12:21:52,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:52,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 12:21:52,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:52,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:52,728 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:52,728 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77050005] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:52,728 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:52,728 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 12:21:52,729 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587735484] [2021-05-02 12:21:52,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:21:52,729 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:52,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:21:52,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:21:52,730 INFO L87 Difference]: Start difference. First operand 165 states and 188 transitions. Second operand has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 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 12:21:54,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:54,487 INFO L93 Difference]: Finished difference Result 292 states and 341 transitions. [2021-05-02 12:21:54,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 12:21:54,488 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 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 12:21:54,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:54,489 INFO L225 Difference]: With dead ends: 292 [2021-05-02 12:21:54,489 INFO L226 Difference]: Without dead ends: 176 [2021-05-02 12:21:54,490 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 53 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 407.9ms TimeCoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:21:54,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-05-02 12:21:54,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 172. [2021-05-02 12:21:54,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 25 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 12:21:54,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 196 transitions. [2021-05-02 12:21:54,499 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 196 transitions. Word has length 56 [2021-05-02 12:21:54,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:54,499 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 196 transitions. [2021-05-02 12:21:54,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 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 12:21:54,499 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 196 transitions. [2021-05-02 12:21:54,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 12:21:54,500 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:54,500 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:54,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 12:21:54,713 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:54,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:54,713 INFO L82 PathProgramCache]: Analyzing trace with hash 455274898, now seen corresponding path program 22 times [2021-05-02 12:21:54,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:54,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305810877] [2021-05-02 12:21:54,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:54,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:55,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:55,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:55,108 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:55,108 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:55,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305810877] [2021-05-02 12:21:55,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305810877] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:55,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [863206665] [2021-05-02 12:21:55,109 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 12:21:55,160 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:21:55,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:55,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 12:21:55,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:55,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:55,471 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:55,471 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [863206665] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:55,471 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:55,472 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-02 12:21:55,472 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730548047] [2021-05-02 12:21:55,472 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 12:21:55,472 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:55,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 12:21:55,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:21:55,473 INFO L87 Difference]: Start difference. First operand 172 states and 196 transitions. Second operand has 27 states, 27 states have (on average 2.111111111111111) internal successors, (57), 26 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 12:21:57,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:57,041 INFO L93 Difference]: Finished difference Result 304 states and 355 transitions. [2021-05-02 12:21:57,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:21:57,041 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.111111111111111) internal successors, (57), 26 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 12:21:57,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:57,042 INFO L225 Difference]: With dead ends: 304 [2021-05-02 12:21:57,042 INFO L226 Difference]: Without dead ends: 183 [2021-05-02 12:21:57,043 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 39 SyntacticMatches, 20 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 553.6ms TimeCoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:21:57,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-05-02 12:21:57,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 179. [2021-05-02 12:21:57,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 150 states have (on average 1.02) internal successors, (153), 150 states have internal predecessors, (153), 26 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-05-02 12:21:57,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 204 transitions. [2021-05-02 12:21:57,049 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 204 transitions. Word has length 58 [2021-05-02 12:21:57,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:57,049 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 204 transitions. [2021-05-02 12:21:57,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.111111111111111) internal successors, (57), 26 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 12:21:57,049 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 204 transitions. [2021-05-02 12:21:57,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 12:21:57,050 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:57,050 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:57,273 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:57,273 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:57,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:57,273 INFO L82 PathProgramCache]: Analyzing trace with hash 2019462516, now seen corresponding path program 23 times [2021-05-02 12:21:57,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:57,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833221349] [2021-05-02 12:21:57,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:57,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:57,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:57,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:57,721 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:57,721 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:57,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833221349] [2021-05-02 12:21:57,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833221349] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:57,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94312455] [2021-05-02 12:21:57,722 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 12:23:58,986 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-05-02 12:23:58,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:23:59,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 12:23:59,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:23:59,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:59,159 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:59,159 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [94312455] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:59,159 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:23:59,159 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 12:23:59,159 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947607128] [2021-05-02 12:23:59,160 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:23:59,160 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:23:59,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:23:59,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:23:59,160 INFO L87 Difference]: Start difference. First operand 179 states and 204 transitions. Second operand has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 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 12:24:00,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:24:00,822 INFO L93 Difference]: Finished difference Result 316 states and 369 transitions. [2021-05-02 12:24:00,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:24:00,823 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 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 12:24:00,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:24:00,824 INFO L225 Difference]: With dead ends: 316 [2021-05-02 12:24:00,824 INFO L226 Difference]: Without dead ends: 190 [2021-05-02 12:24:00,825 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 390.2ms TimeCoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:24:00,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-05-02 12:24:00,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 186. [2021-05-02 12:24:00,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 27 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-05-02 12:24:00,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 212 transitions. [2021-05-02 12:24:00,832 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 212 transitions. Word has length 60 [2021-05-02 12:24:00,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:24:00,832 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 212 transitions. [2021-05-02 12:24:00,832 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 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 12:24:00,833 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 212 transitions. [2021-05-02 12:24:00,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 12:24:00,833 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:24:00,833 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:24:01,048 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 12:24:01,049 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:24:01,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:24:01,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1965209814, now seen corresponding path program 24 times [2021-05-02 12:24:01,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:24:01,049 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738388984] [2021-05-02 12:24:01,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:24:01,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:01,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:24:01,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:01,535 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:24:01,535 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:24:01,535 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738388984] [2021-05-02 12:24:01,535 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738388984] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:01,535 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385185104] [2021-05-02 12:24:01,535 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