java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-examples/sorting_selectionsort_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:31:50,623 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:31:50,626 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:31:50,642 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-10-15 01:31:50,652 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:31:50,653 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:31:50,654 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:31:50,655 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:31:50,656 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:31:50,657 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:31:50,659 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:31:50,661 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:31:50,663 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:31:50,664 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:31:50,665 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:31:50,668 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:31:50,672 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:31:50,684 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:31:50,688 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:31:50,689 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:31:50,693 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 [2019-10-15 01:31:50,717 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:31:50,718 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:31:50,720 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:31:50,721 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:31:50,721 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:31:50,721 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:31:50,721 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:31:50,722 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:31:50,722 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:31:50,722 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:31:50,723 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:31:50,724 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:31:50,724 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:31:50,724 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:31:50,724 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:31:50,725 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:31:50,725 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:31:50,725 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:31:50,725 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:31:50,725 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:31:50,726 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:31:50,726 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:31:50,726 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:31:50,727 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:31:50,727 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:31:50,727 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:31:50,727 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:31:50,727 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:31:50,728 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-15 01:31:51,004 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:31:51,019 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:31:51,023 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:31:51,025 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:31:51,025 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:31:51,026 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/sorting_selectionsort_ground-1.i [2019-10-15 01:31:51,103 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/606bb0108/bd1086b9536346a5aed3e323b2fabcf8/FLAG595f58bf6 [2019-10-15 01:31:51,571 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:31:51,572 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/sorting_selectionsort_ground-1.i [2019-10-15 01:31:51,582 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/606bb0108/bd1086b9536346a5aed3e323b2fabcf8/FLAG595f58bf6 [2019-10-15 01:31:51,912 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/606bb0108/bd1086b9536346a5aed3e323b2fabcf8 [2019-10-15 01:31:51,924 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:31:51,926 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:31:51,928 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:31:51,928 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:31:51,932 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:31:51,933 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:31:51" (1/1) ... [2019-10-15 01:31:51,936 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6688ee2a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:51, skipping insertion in model container [2019-10-15 01:31:51,936 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:31:51" (1/1) ... [2019-10-15 01:31:51,947 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:31:51,973 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:31:52,242 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:31:52,246 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:31:52,271 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:31:52,387 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:31:52,388 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:52 WrapperNode [2019-10-15 01:31:52,388 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:31:52,389 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:31:52,389 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:31:52,389 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:31:52,404 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:52" (1/1) ... [2019-10-15 01:31:52,404 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:52" (1/1) ... [2019-10-15 01:31:52,414 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:52" (1/1) ... [2019-10-15 01:31:52,415 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:52" (1/1) ... [2019-10-15 01:31:52,424 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:52" (1/1) ... [2019-10-15 01:31:52,432 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:52" (1/1) ... [2019-10-15 01:31:52,435 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:52" (1/1) ... [2019-10-15 01:31:52,443 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:31:52,443 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:31:52,444 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:31:52,444 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:31:52,445 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:52" (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 [2019-10-15 01:31:52,506 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:31:52,506 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:31:52,507 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:31:52,507 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:31:52,507 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:31:52,507 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:31:52,507 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:31:52,508 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:31:52,508 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:31:52,508 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:31:52,508 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:31:52,508 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:31:52,509 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:31:52,509 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:31:53,004 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:31:53,005 INFO L284 CfgBuilder]: Removed 8 assume(true) statements. [2019-10-15 01:31:53,006 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:31:53 BoogieIcfgContainer [2019-10-15 01:31:53,006 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:31:53,007 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:31:53,008 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:31:53,011 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:31:53,011 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:31:51" (1/3) ... [2019-10-15 01:31:53,012 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12a73b45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:31:53, skipping insertion in model container [2019-10-15 01:31:53,012 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:52" (2/3) ... [2019-10-15 01:31:53,012 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12a73b45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:31:53, skipping insertion in model container [2019-10-15 01:31:53,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:31:53" (3/3) ... [2019-10-15 01:31:53,014 INFO L109 eAbstractionObserver]: Analyzing ICFG sorting_selectionsort_ground-1.i [2019-10-15 01:31:53,024 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:31:53,032 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:31:53,041 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:31:53,067 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:31:53,067 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:31:53,067 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:31:53,067 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:31:53,068 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:31:53,068 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:31:53,068 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:31:53,068 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:31:53,084 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2019-10-15 01:31:53,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:31:53,090 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:53,091 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:53,092 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:53,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:53,097 INFO L82 PathProgramCache]: Analyzing trace with hash 1973278226, now seen corresponding path program 1 times [2019-10-15 01:31:53,104 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:53,104 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [460904314] [2019-10-15 01:31:53,105 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:53,105 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:53,105 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:53,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:53,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:53,259 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [460904314] [2019-10-15 01:31:53,260 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:53,260 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:31:53,260 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231219369] [2019-10-15 01:31:53,264 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:31:53,265 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:53,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:31:53,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:31:53,277 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 3 states. [2019-10-15 01:31:53,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:53,330 INFO L93 Difference]: Finished difference Result 51 states and 74 transitions. [2019-10-15 01:31:53,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:31:53,332 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-10-15 01:31:53,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:53,342 INFO L225 Difference]: With dead ends: 51 [2019-10-15 01:31:53,343 INFO L226 Difference]: Without dead ends: 26 [2019-10-15 01:31:53,348 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:31:53,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-15 01:31:53,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-15 01:31:53,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-15 01:31:53,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 35 transitions. [2019-10-15 01:31:53,405 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 35 transitions. Word has length 13 [2019-10-15 01:31:53,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:53,405 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 35 transitions. [2019-10-15 01:31:53,406 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:31:53,406 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 35 transitions. [2019-10-15 01:31:53,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 01:31:53,407 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:53,407 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:53,408 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:53,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:53,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1107315554, now seen corresponding path program 1 times [2019-10-15 01:31:53,408 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:53,409 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682091301] [2019-10-15 01:31:53,409 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:53,409 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:53,409 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:53,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:53,491 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:31:53,491 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682091301] [2019-10-15 01:31:53,492 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:53,492 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:31:53,492 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867241681] [2019-10-15 01:31:53,494 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:31:53,494 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:53,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:31:53,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:31:53,495 INFO L87 Difference]: Start difference. First operand 26 states and 35 transitions. Second operand 3 states. [2019-10-15 01:31:53,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:53,559 INFO L93 Difference]: Finished difference Result 45 states and 62 transitions. [2019-10-15 01:31:53,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:31:53,560 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-10-15 01:31:53,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:53,561 INFO L225 Difference]: With dead ends: 45 [2019-10-15 01:31:53,561 INFO L226 Difference]: Without dead ends: 35 [2019-10-15 01:31:53,563 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:31:53,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-15 01:31:53,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 27. [2019-10-15 01:31:53,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-15 01:31:53,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2019-10-15 01:31:53,574 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 14 [2019-10-15 01:31:53,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:53,574 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2019-10-15 01:31:53,574 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:31:53,574 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2019-10-15 01:31:53,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 01:31:53,575 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:53,575 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:53,576 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:53,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:53,576 INFO L82 PathProgramCache]: Analyzing trace with hash -1470921508, now seen corresponding path program 1 times [2019-10-15 01:31:53,577 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:53,577 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708779714] [2019-10-15 01:31:53,577 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:53,577 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:53,577 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:53,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:53,706 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:31:53,706 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708779714] [2019-10-15 01:31:53,707 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:53,707 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:31:53,709 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853559090] [2019-10-15 01:31:53,710 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:31:53,710 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:53,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:31:53,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:31:53,711 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand 4 states. [2019-10-15 01:31:53,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:53,801 INFO L93 Difference]: Finished difference Result 55 states and 79 transitions. [2019-10-15 01:31:53,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:31:53,802 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-15 01:31:53,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:53,803 INFO L225 Difference]: With dead ends: 55 [2019-10-15 01:31:53,803 INFO L226 Difference]: Without dead ends: 36 [2019-10-15 01:31:53,804 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:31:53,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-15 01:31:53,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2019-10-15 01:31:53,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-15 01:31:53,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2019-10-15 01:31:53,812 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 15 [2019-10-15 01:31:53,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:53,812 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2019-10-15 01:31:53,812 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:31:53,812 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2019-10-15 01:31:53,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-15 01:31:53,813 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:53,813 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:53,814 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:53,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:53,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1528376143, now seen corresponding path program 1 times [2019-10-15 01:31:53,815 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:53,815 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180619470] [2019-10-15 01:31:53,815 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:53,815 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:53,815 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:53,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:53,917 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:31:53,917 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180619470] [2019-10-15 01:31:53,917 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991648637] [2019-10-15 01:31:53,918 INFO L94 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 [2019-10-15 01:31:53,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:53,985 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:31:53,992 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:54,045 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:31:54,046 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:54,083 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:31:54,084 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [60848495] [2019-10-15 01:31:54,110 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:31:54,110 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:54,116 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:54,124 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:54,125 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:54,278 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:31:54,663 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2019-10-15 01:31:54,682 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:31:54,695 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:54,969 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:31:54,969 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [5, 4, 4] total 18 [2019-10-15 01:31:54,970 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275317462] [2019-10-15 01:31:54,971 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-15 01:31:54,971 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:54,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-15 01:31:54,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:31:54,972 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand 11 states. [2019-10-15 01:31:55,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:55,388 INFO L93 Difference]: Finished difference Result 59 states and 82 transitions. [2019-10-15 01:31:55,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-15 01:31:55,388 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2019-10-15 01:31:55,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:55,389 INFO L225 Difference]: With dead ends: 59 [2019-10-15 01:31:55,389 INFO L226 Difference]: Without dead ends: 40 [2019-10-15 01:31:55,390 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:31:55,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-15 01:31:55,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2019-10-15 01:31:55,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-15 01:31:55,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2019-10-15 01:31:55,400 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 16 [2019-10-15 01:31:55,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:55,400 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2019-10-15 01:31:55,400 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-15 01:31:55,401 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2019-10-15 01:31:55,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-15 01:31:55,401 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:55,402 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:55,605 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:55,605 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:55,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:55,606 INFO L82 PathProgramCache]: Analyzing trace with hash 2138333176, now seen corresponding path program 1 times [2019-10-15 01:31:55,607 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:55,607 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350158020] [2019-10-15 01:31:55,608 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:55,608 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:55,608 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:55,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:55,655 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:31:55,655 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350158020] [2019-10-15 01:31:55,656 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321077786] [2019-10-15 01:31:55,656 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:55,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:55,710 INFO L256 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:31:55,713 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:55,721 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-15 01:31:55,721 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:55,760 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:31:55,761 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [693825345] [2019-10-15 01:31:55,764 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:31:55,764 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:55,765 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:55,765 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:55,765 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:55,797 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:31:56,082 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:31:56,111 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:31:56,116 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:56,576 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:56,577 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 14] total 20 [2019-10-15 01:31:56,577 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019086851] [2019-10-15 01:31:56,578 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-15 01:31:56,578 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:56,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-15 01:31:56,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2019-10-15 01:31:56,579 INFO L87 Difference]: Start difference. First operand 36 states and 46 transitions. Second operand 20 states. [2019-10-15 01:31:57,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:57,271 INFO L93 Difference]: Finished difference Result 72 states and 96 transitions. [2019-10-15 01:31:57,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-15 01:31:57,274 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 23 [2019-10-15 01:31:57,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:57,275 INFO L225 Difference]: With dead ends: 72 [2019-10-15 01:31:57,275 INFO L226 Difference]: Without dead ends: 43 [2019-10-15 01:31:57,277 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=192, Invalid=998, Unknown=0, NotChecked=0, Total=1190 [2019-10-15 01:31:57,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-15 01:31:57,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 39. [2019-10-15 01:31:57,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-10-15 01:31:57,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 49 transitions. [2019-10-15 01:31:57,285 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 49 transitions. Word has length 23 [2019-10-15 01:31:57,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:57,286 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 49 transitions. [2019-10-15 01:31:57,286 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-15 01:31:57,286 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 49 transitions. [2019-10-15 01:31:57,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-15 01:31:57,287 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:57,287 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:57,490 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:57,491 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:57,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:57,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1268466172, now seen corresponding path program 2 times [2019-10-15 01:31:57,492 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:57,492 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078263845] [2019-10-15 01:31:57,492 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:57,493 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:57,493 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:57,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:57,572 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:31:57,572 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078263845] [2019-10-15 01:31:57,573 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633264934] [2019-10-15 01:31:57,573 INFO L92 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 [2019-10-15 01:31:57,642 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:31:57,642 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:57,644 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:31:57,649 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:57,709 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-10-15 01:31:57,710 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:57,755 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:31:57,756 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [29240117] [2019-10-15 01:31:57,757 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:31:57,758 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:57,758 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:57,758 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:57,759 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:57,806 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:31:58,146 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:31:58,169 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:31:58,174 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:58,741 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:58,742 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5, 14] total 26 [2019-10-15 01:31:58,742 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534854795] [2019-10-15 01:31:58,743 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-15 01:31:58,743 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:58,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-15 01:31:58,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2019-10-15 01:31:58,744 INFO L87 Difference]: Start difference. First operand 39 states and 49 transitions. Second operand 26 states. [2019-10-15 01:31:59,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:59,790 INFO L93 Difference]: Finished difference Result 87 states and 121 transitions. [2019-10-15 01:31:59,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-15 01:31:59,790 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2019-10-15 01:31:59,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:59,791 INFO L225 Difference]: With dead ends: 87 [2019-10-15 01:31:59,792 INFO L226 Difference]: Without dead ends: 58 [2019-10-15 01:31:59,793 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 617 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=367, Invalid=2083, Unknown=0, NotChecked=0, Total=2450 [2019-10-15 01:31:59,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-15 01:31:59,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 49. [2019-10-15 01:31:59,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-10-15 01:31:59,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 61 transitions. [2019-10-15 01:31:59,804 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 61 transitions. Word has length 26 [2019-10-15 01:31:59,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:59,804 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 61 transitions. [2019-10-15 01:31:59,804 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-15 01:31:59,804 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 61 transitions. [2019-10-15 01:31:59,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-15 01:31:59,805 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:59,805 INFO L380 BasicCegarLoop]: trace histogram [5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:00,017 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:00,018 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:00,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:00,018 INFO L82 PathProgramCache]: Analyzing trace with hash -538255861, now seen corresponding path program 3 times [2019-10-15 01:32:00,021 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:00,021 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1269626120] [2019-10-15 01:32:00,021 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:00,022 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:00,022 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:00,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:00,121 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:32:00,121 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1269626120] [2019-10-15 01:32:00,122 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467904246] [2019-10-15 01:32:00,122 INFO L92 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 [2019-10-15 01:32:00,199 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:32:00,199 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:00,200 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 01:32:00,202 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:00,220 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-10-15 01:32:00,221 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:00,294 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:32:00,295 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1311319101] [2019-10-15 01:32:00,296 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:32:00,297 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:00,297 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:00,297 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:00,298 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:00,325 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:00,558 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:32:00,575 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:00,578 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:01,035 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:01,035 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 14] total 28 [2019-10-15 01:32:01,036 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352925153] [2019-10-15 01:32:01,036 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-15 01:32:01,037 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:01,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-15 01:32:01,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=608, Unknown=0, NotChecked=0, Total=756 [2019-10-15 01:32:01,038 INFO L87 Difference]: Start difference. First operand 49 states and 61 transitions. Second operand 28 states. [2019-10-15 01:32:01,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:01,940 INFO L93 Difference]: Finished difference Result 95 states and 125 transitions. [2019-10-15 01:32:01,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-15 01:32:01,941 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 30 [2019-10-15 01:32:01,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:01,942 INFO L225 Difference]: With dead ends: 95 [2019-10-15 01:32:01,943 INFO L226 Difference]: Without dead ends: 57 [2019-10-15 01:32:01,945 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 783 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=428, Invalid=2122, Unknown=0, NotChecked=0, Total=2550 [2019-10-15 01:32:01,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-10-15 01:32:01,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2019-10-15 01:32:01,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-15 01:32:01,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 68 transitions. [2019-10-15 01:32:01,955 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 68 transitions. Word has length 30 [2019-10-15 01:32:01,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:01,955 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 68 transitions. [2019-10-15 01:32:01,956 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-15 01:32:01,956 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 68 transitions. [2019-10-15 01:32:01,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-15 01:32:01,957 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:01,957 INFO L380 BasicCegarLoop]: trace histogram [12, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:02,160 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:02,161 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:02,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:02,162 INFO L82 PathProgramCache]: Analyzing trace with hash -1936941697, now seen corresponding path program 4 times [2019-10-15 01:32:02,162 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:02,163 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980335405] [2019-10-15 01:32:02,163 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:02,163 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:02,164 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:02,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:02,366 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:32:02,367 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980335405] [2019-10-15 01:32:02,367 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044495849] [2019-10-15 01:32:02,367 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:02,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:02,459 INFO L256 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-15 01:32:02,461 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:02,479 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-10-15 01:32:02,479 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:02,764 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:32:02,765 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1466709390] [2019-10-15 01:32:02,766 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:32:02,766 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:02,767 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:02,767 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:02,768 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:02,805 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:02,972 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:32:02,986 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:02,989 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:03,480 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:03,481 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 14] total 42 [2019-10-15 01:32:03,481 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171936229] [2019-10-15 01:32:03,482 INFO L442 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-10-15 01:32:03,482 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:03,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-10-15 01:32:03,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=449, Invalid=1273, Unknown=0, NotChecked=0, Total=1722 [2019-10-15 01:32:03,483 INFO L87 Difference]: Start difference. First operand 56 states and 68 transitions. Second operand 42 states. [2019-10-15 01:32:05,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:05,049 INFO L93 Difference]: Finished difference Result 109 states and 146 transitions. [2019-10-15 01:32:05,049 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-10-15 01:32:05,050 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 37 [2019-10-15 01:32:05,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:05,051 INFO L225 Difference]: With dead ends: 109 [2019-10-15 01:32:05,051 INFO L226 Difference]: Without dead ends: 71 [2019-10-15 01:32:05,055 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1784 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1303, Invalid=4859, Unknown=0, NotChecked=0, Total=6162 [2019-10-15 01:32:05,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-10-15 01:32:05,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2019-10-15 01:32:05,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-10-15 01:32:05,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 82 transitions. [2019-10-15 01:32:05,065 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 82 transitions. Word has length 37 [2019-10-15 01:32:05,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:05,065 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 82 transitions. [2019-10-15 01:32:05,065 INFO L463 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-10-15 01:32:05,066 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 82 transitions. [2019-10-15 01:32:05,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-15 01:32:05,067 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:05,067 INFO L380 BasicCegarLoop]: trace histogram [26, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:05,270 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:05,271 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:05,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:05,271 INFO L82 PathProgramCache]: Analyzing trace with hash -1780353025, now seen corresponding path program 5 times [2019-10-15 01:32:05,272 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:05,272 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60230004] [2019-10-15 01:32:05,272 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:05,272 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:05,273 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:05,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:05,709 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 2 proven. 351 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:32:05,709 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60230004] [2019-10-15 01:32:05,709 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1586243848] [2019-10-15 01:32:05,710 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:05,812 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:32:05,812 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:05,813 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 01:32:05,815 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:05,933 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2019-10-15 01:32:05,934 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:06,139 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2019-10-15 01:32:06,139 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1967343384] [2019-10-15 01:32:06,141 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:32:06,141 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:06,142 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:06,142 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:06,142 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:06,169 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:06,366 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:32:06,385 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:06,388 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:07,162 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:07,163 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 8, 8, 14] total 54 [2019-10-15 01:32:07,163 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720325514] [2019-10-15 01:32:07,164 INFO L442 AbstractCegarLoop]: Interpolant automaton has 54 states [2019-10-15 01:32:07,164 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:07,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2019-10-15 01:32:07,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=529, Invalid=2333, Unknown=0, NotChecked=0, Total=2862 [2019-10-15 01:32:07,165 INFO L87 Difference]: Start difference. First operand 70 states and 82 transitions. Second operand 54 states. [2019-10-15 01:32:10,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:10,538 INFO L93 Difference]: Finished difference Result 127 states and 166 transitions. [2019-10-15 01:32:10,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-10-15 01:32:10,538 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 51 [2019-10-15 01:32:10,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:10,540 INFO L225 Difference]: With dead ends: 127 [2019-10-15 01:32:10,540 INFO L226 Difference]: Without dead ends: 89 [2019-10-15 01:32:10,544 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 127 SyntacticMatches, 2 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2935 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1880, Invalid=9892, Unknown=0, NotChecked=0, Total=11772 [2019-10-15 01:32:10,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-10-15 01:32:10,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 80. [2019-10-15 01:32:10,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-10-15 01:32:10,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 92 transitions. [2019-10-15 01:32:10,556 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 92 transitions. Word has length 51 [2019-10-15 01:32:10,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:10,556 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 92 transitions. [2019-10-15 01:32:10,556 INFO L463 AbstractCegarLoop]: Interpolant automaton has 54 states. [2019-10-15 01:32:10,556 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 92 transitions. [2019-10-15 01:32:10,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-10-15 01:32:10,558 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:10,558 INFO L380 BasicCegarLoop]: trace histogram [27, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:10,765 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:10,766 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:10,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:10,767 INFO L82 PathProgramCache]: Analyzing trace with hash 690214507, now seen corresponding path program 6 times [2019-10-15 01:32:10,768 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:10,768 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791923654] [2019-10-15 01:32:10,768 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:10,768 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:10,769 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:10,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:11,183 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 2 proven. 378 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-15 01:32:11,183 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791923654] [2019-10-15 01:32:11,184 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [33962623] [2019-10-15 01:32:11,184 INFO L92 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 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 [2019-10-15 01:32:11,321 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:32:11,321 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:11,323 INFO L256 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 29 conjunts are in the unsatisfiable core [2019-10-15 01:32:11,326 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:11,345 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2019-10-15 01:32:11,345 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:12,313 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 2 proven. 378 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-15 01:32:12,314 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2121368271] [2019-10-15 01:32:12,315 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:32:12,315 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:12,317 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:12,317 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:12,317 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:12,345 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:12,540 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:32:12,552 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:12,554 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:13,189 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:13,190 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 14] total 72 [2019-10-15 01:32:13,190 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425801274] [2019-10-15 01:32:13,191 INFO L442 AbstractCegarLoop]: Interpolant automaton has 72 states [2019-10-15 01:32:13,191 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:13,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2019-10-15 01:32:13,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1754, Invalid=3358, Unknown=0, NotChecked=0, Total=5112 [2019-10-15 01:32:13,194 INFO L87 Difference]: Start difference. First operand 80 states and 92 transitions. Second operand 72 states. [2019-10-15 01:32:16,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:16,602 INFO L93 Difference]: Finished difference Result 157 states and 209 transitions. [2019-10-15 01:32:16,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2019-10-15 01:32:16,602 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 58 [2019-10-15 01:32:16,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:16,604 INFO L225 Difference]: With dead ends: 157 [2019-10-15 01:32:16,604 INFO L226 Difference]: Without dead ends: 110 [2019-10-15 01:32:16,611 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4754 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=5158, Invalid=14024, Unknown=0, NotChecked=0, Total=19182 [2019-10-15 01:32:16,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2019-10-15 01:32:16,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2019-10-15 01:32:16,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2019-10-15 01:32:16,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 121 transitions. [2019-10-15 01:32:16,624 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 121 transitions. Word has length 58 [2019-10-15 01:32:16,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:16,625 INFO L462 AbstractCegarLoop]: Abstraction has 109 states and 121 transitions. [2019-10-15 01:32:16,625 INFO L463 AbstractCegarLoop]: Interpolant automaton has 72 states. [2019-10-15 01:32:16,625 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 121 transitions. [2019-10-15 01:32:16,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-15 01:32:16,627 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:16,627 INFO L380 BasicCegarLoop]: trace histogram [56, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:16,831 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:16,831 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:16,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:16,832 INFO L82 PathProgramCache]: Analyzing trace with hash -269434785, now seen corresponding path program 7 times [2019-10-15 01:32:16,832 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:16,832 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874820344] [2019-10-15 01:32:16,833 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:16,833 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:16,833 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:16,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:18,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 2 proven. 1596 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-15 01:32:18,202 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874820344] [2019-10-15 01:32:18,202 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499757792] [2019-10-15 01:32:18,203 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:18,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:18,380 INFO L256 TraceCheckSpWp]: Trace formula consists of 459 conjuncts, 58 conjunts are in the unsatisfiable core [2019-10-15 01:32:18,384 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:18,411 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2019-10-15 01:32:18,411 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:22,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 2 proven. 1596 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-15 01:32:22,064 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [755446261] [2019-10-15 01:32:22,065 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:32:22,065 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:22,066 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:22,066 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:22,066 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:22,111 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:22,275 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:32:22,291 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:22,293 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:23,081 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:23,081 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59, 14] total 130 [2019-10-15 01:32:23,081 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423224023] [2019-10-15 01:32:23,082 INFO L442 AbstractCegarLoop]: Interpolant automaton has 130 states [2019-10-15 01:32:23,083 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:23,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2019-10-15 01:32:23,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6829, Invalid=9941, Unknown=0, NotChecked=0, Total=16770 [2019-10-15 01:32:23,088 INFO L87 Difference]: Start difference. First operand 109 states and 121 transitions. Second operand 130 states.