/usr/bin/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 --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/eca-rers2012/Problem11_label28.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 22:46:46,395 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 22:46:46,399 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 22:46:46,417 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-06 22:46:46,441 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 22:46:46,443 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 22:46:46,444 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 22:46:46,446 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 22:46:46,448 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 22:46:46,448 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 22:46:46,450 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 22:46:46,454 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 22:46:46,458 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 22:46:46,461 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 22:46:46,464 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 22:46:46,464 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 22:46:46,466 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 22:46:46,475 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 22:46:46,475 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 22:46:46,476 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 22:46:46,477 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 [2019-11-06 22:46:46,504 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 22:46:46,510 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 22:46:46,511 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 22:46:46,511 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 22:46:46,512 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 22:46:46,515 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 22:46:46,515 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 22:46:46,515 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 22:46:46,515 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 22:46:46,516 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 22:46:46,516 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 22:46:46,516 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 22:46:46,516 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 22:46:46,516 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 22:46:46,517 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 22:46:46,517 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 22:46:46,517 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 22:46:46,517 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 22:46:46,517 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 22:46:46,519 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 22:46:46,519 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 22:46:46,519 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 22:46:46,519 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 22:46:46,519 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 22:46:46,520 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 22:46:46,520 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 22:46:46,520 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 22:46:46,520 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 22:46:46,520 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-11-06 22:46:46,813 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 22:46:46,826 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 22:46:46,829 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 22:46:46,830 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 22:46:46,831 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 22:46:46,831 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem11_label28.c [2019-11-06 22:46:46,903 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/49bfe5bd9/41556a4269224236a34687d83aee0b23/FLAG83b8e0dd9 [2019-11-06 22:46:47,491 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 22:46:47,492 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem11_label28.c [2019-11-06 22:46:47,523 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/49bfe5bd9/41556a4269224236a34687d83aee0b23/FLAG83b8e0dd9 [2019-11-06 22:46:47,701 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/49bfe5bd9/41556a4269224236a34687d83aee0b23 [2019-11-06 22:46:47,712 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 22:46:47,713 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 22:46:47,718 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 22:46:47,719 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 22:46:47,722 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 22:46:47,723 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:46:47" (1/1) ... [2019-11-06 22:46:47,726 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c1e6d5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:46:47, skipping insertion in model container [2019-11-06 22:46:47,726 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:46:47" (1/1) ... [2019-11-06 22:46:47,734 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 22:46:47,800 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 22:46:48,401 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:46:48,413 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 22:46:48,686 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:46:48,703 INFO L192 MainTranslator]: Completed translation [2019-11-06 22:46:48,703 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:46:48 WrapperNode [2019-11-06 22:46:48,704 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 22:46:48,704 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 22:46:48,705 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 22:46:48,705 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 22:46:48,720 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:46:48" (1/1) ... [2019-11-06 22:46:48,720 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:46:48" (1/1) ... [2019-11-06 22:46:48,744 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:46:48" (1/1) ... [2019-11-06 22:46:48,744 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:46:48" (1/1) ... [2019-11-06 22:46:48,816 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:46:48" (1/1) ... [2019-11-06 22:46:48,844 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:46:48" (1/1) ... [2019-11-06 22:46:48,876 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:46:48" (1/1) ... [2019-11-06 22:46:48,894 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 22:46:48,894 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 22:46:48,895 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 22:46:48,904 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 22:46:48,906 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:46:48" (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 [2019-11-06 22:46:48,984 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 22:46:48,984 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 22:46:48,984 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-06 22:46:48,984 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 22:46:48,985 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-06 22:46:48,985 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 22:46:48,986 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 22:46:48,986 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-06 22:46:48,986 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 22:46:48,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 22:46:48,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 22:46:50,750 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 22:46:50,753 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 22:46:50,755 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:46:50 BoogieIcfgContainer [2019-11-06 22:46:50,755 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 22:46:50,758 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 22:46:50,758 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 22:46:50,763 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 22:46:50,764 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:46:47" (1/3) ... [2019-11-06 22:46:50,765 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24bf82ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:46:50, skipping insertion in model container [2019-11-06 22:46:50,765 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:46:48" (2/3) ... [2019-11-06 22:46:50,766 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24bf82ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:46:50, skipping insertion in model container [2019-11-06 22:46:50,766 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:46:50" (3/3) ... [2019-11-06 22:46:50,772 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem11_label28.c [2019-11-06 22:46:50,785 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 22:46:50,794 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 22:46:50,806 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 22:46:50,845 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 22:46:50,845 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 22:46:50,846 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 22:46:50,846 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 22:46:50,846 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 22:46:50,847 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 22:46:50,847 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 22:46:50,847 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 22:46:50,885 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states. [2019-11-06 22:46:50,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-11-06 22:46:50,894 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:46:50,895 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:46:50,897 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:46:50,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:46:50,903 INFO L82 PathProgramCache]: Analyzing trace with hash -1610348989, now seen corresponding path program 1 times [2019-11-06 22:46:50,914 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:46:50,915 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168220590] [2019-11-06 22:46:50,915 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:46:51,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:46:51,302 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:46:51,303 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168220590] [2019-11-06 22:46:51,304 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:46:51,304 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 22:46:51,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377634900] [2019-11-06 22:46:51,311 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:46:51,312 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:46:51,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:46:51,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 22:46:51,330 INFO L87 Difference]: Start difference. First operand 292 states. Second operand 4 states. [2019-11-06 22:46:53,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:46:53,532 INFO L93 Difference]: Finished difference Result 978 states and 1754 transitions. [2019-11-06 22:46:53,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 22:46:53,534 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 54 [2019-11-06 22:46:53,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:46:53,555 INFO L225 Difference]: With dead ends: 978 [2019-11-06 22:46:53,555 INFO L226 Difference]: Without dead ends: 619 [2019-11-06 22:46:53,566 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 22:46:53,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 619 states. [2019-11-06 22:46:53,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 619 to 619. [2019-11-06 22:46:53,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 619 states. [2019-11-06 22:46:53,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 619 states to 619 states and 859 transitions. [2019-11-06 22:46:53,674 INFO L78 Accepts]: Start accepts. Automaton has 619 states and 859 transitions. Word has length 54 [2019-11-06 22:46:53,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:46:53,674 INFO L462 AbstractCegarLoop]: Abstraction has 619 states and 859 transitions. [2019-11-06 22:46:53,675 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 22:46:53,675 INFO L276 IsEmpty]: Start isEmpty. Operand 619 states and 859 transitions. [2019-11-06 22:46:53,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2019-11-06 22:46:53,681 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:46:53,682 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:46:53,682 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:46:53,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:46:53,683 INFO L82 PathProgramCache]: Analyzing trace with hash -1973618443, now seen corresponding path program 1 times [2019-11-06 22:46:53,683 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:46:53,683 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570043489] [2019-11-06 22:46:53,683 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:46:53,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:46:53,890 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:46:53,890 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570043489] [2019-11-06 22:46:53,890 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:46:53,891 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 22:46:53,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598294900] [2019-11-06 22:46:53,893 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:46:53,893 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:46:53,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:46:53,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 22:46:53,894 INFO L87 Difference]: Start difference. First operand 619 states and 859 transitions. Second operand 4 states. [2019-11-06 22:46:55,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:46:55,799 INFO L93 Difference]: Finished difference Result 2378 states and 3384 transitions. [2019-11-06 22:46:55,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 22:46:55,800 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 127 [2019-11-06 22:46:55,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:46:55,815 INFO L225 Difference]: With dead ends: 2378 [2019-11-06 22:46:55,815 INFO L226 Difference]: Without dead ends: 1765 [2019-11-06 22:46:55,817 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 22:46:55,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1765 states. [2019-11-06 22:46:55,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1765 to 1750. [2019-11-06 22:46:55,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1750 states. [2019-11-06 22:46:55,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1750 states to 1750 states and 2347 transitions. [2019-11-06 22:46:55,897 INFO L78 Accepts]: Start accepts. Automaton has 1750 states and 2347 transitions. Word has length 127 [2019-11-06 22:46:55,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:46:55,898 INFO L462 AbstractCegarLoop]: Abstraction has 1750 states and 2347 transitions. [2019-11-06 22:46:55,898 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 22:46:55,899 INFO L276 IsEmpty]: Start isEmpty. Operand 1750 states and 2347 transitions. [2019-11-06 22:46:55,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2019-11-06 22:46:55,909 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:46:55,909 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:46:55,909 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:46:55,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:46:55,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1199392174, now seen corresponding path program 1 times [2019-11-06 22:46:55,910 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:46:55,910 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87522419] [2019-11-06 22:46:55,910 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:46:55,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:46:56,131 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:46:56,132 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87522419] [2019-11-06 22:46:56,132 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:46:56,132 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 22:46:56,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399546234] [2019-11-06 22:46:56,133 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 22:46:56,133 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:46:56,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 22:46:56,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:46:56,134 INFO L87 Difference]: Start difference. First operand 1750 states and 2347 transitions. Second operand 6 states. [2019-11-06 22:46:57,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:46:57,935 INFO L93 Difference]: Finished difference Result 4688 states and 6402 transitions. [2019-11-06 22:46:57,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:46:57,936 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 134 [2019-11-06 22:46:57,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:46:57,958 INFO L225 Difference]: With dead ends: 4688 [2019-11-06 22:46:57,959 INFO L226 Difference]: Without dead ends: 2944 [2019-11-06 22:46:57,971 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-11-06 22:46:57,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2944 states. [2019-11-06 22:46:58,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2944 to 2929. [2019-11-06 22:46:58,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2929 states. [2019-11-06 22:46:58,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2929 states to 2929 states and 3748 transitions. [2019-11-06 22:46:58,095 INFO L78 Accepts]: Start accepts. Automaton has 2929 states and 3748 transitions. Word has length 134 [2019-11-06 22:46:58,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:46:58,106 INFO L462 AbstractCegarLoop]: Abstraction has 2929 states and 3748 transitions. [2019-11-06 22:46:58,106 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 22:46:58,106 INFO L276 IsEmpty]: Start isEmpty. Operand 2929 states and 3748 transitions. [2019-11-06 22:46:58,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2019-11-06 22:46:58,121 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:46:58,121 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:46:58,121 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:46:58,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:46:58,122 INFO L82 PathProgramCache]: Analyzing trace with hash -91916028, now seen corresponding path program 1 times [2019-11-06 22:46:58,122 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:46:58,122 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98031782] [2019-11-06 22:46:58,123 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:46:58,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:46:58,613 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 44 proven. 123 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:46:58,613 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98031782] [2019-11-06 22:46:58,614 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [994037745] [2019-11-06 22:46:58,614 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 [2019-11-06 22:46:58,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:46:58,727 INFO L256 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 22:46:58,740 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:46:58,832 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-06 22:46:58,913 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 119 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2019-11-06 22:46:58,913 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:46:59,099 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 36 [2019-11-06 22:46:59,137 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:46:59,138 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:46:59,139 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:46:59,141 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-06 22:46:59,142 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:46:59,144 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:46:59,145 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:46:59,147 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:46:59,148 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-06 22:46:59,261 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:46:59,481 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 94 proven. 69 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 22:46:59,482 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-06 22:46:59,482 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [12, 5] total 17 [2019-11-06 22:46:59,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122219107] [2019-11-06 22:46:59,483 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 22:46:59,483 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:46:59,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 22:46:59,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2019-11-06 22:46:59,484 INFO L87 Difference]: Start difference. First operand 2929 states and 3748 transitions. Second operand 5 states. [2019-11-06 22:47:03,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:47:03,118 INFO L93 Difference]: Finished difference Result 6100 states and 7871 transitions. [2019-11-06 22:47:03,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:47:03,119 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 207 [2019-11-06 22:47:03,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:47:03,134 INFO L225 Difference]: With dead ends: 6100 [2019-11-06 22:47:03,134 INFO L226 Difference]: Without dead ends: 3177 [2019-11-06 22:47:03,140 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 429 GetRequests, 411 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2019-11-06 22:47:03,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3177 states. [2019-11-06 22:47:03,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3177 to 3154. [2019-11-06 22:47:03,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3154 states. [2019-11-06 22:47:03,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3154 states to 3154 states and 4036 transitions. [2019-11-06 22:47:03,218 INFO L78 Accepts]: Start accepts. Automaton has 3154 states and 4036 transitions. Word has length 207 [2019-11-06 22:47:03,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:47:03,219 INFO L462 AbstractCegarLoop]: Abstraction has 3154 states and 4036 transitions. [2019-11-06 22:47:03,219 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 22:47:03,219 INFO L276 IsEmpty]: Start isEmpty. Operand 3154 states and 4036 transitions. [2019-11-06 22:47:03,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2019-11-06 22:47:03,224 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:47:03,224 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:47:03,427 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:47:03,427 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:47:03,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:47:03,428 INFO L82 PathProgramCache]: Analyzing trace with hash 563951691, now seen corresponding path program 1 times [2019-11-06 22:47:03,428 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:47:03,429 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510825358] [2019-11-06 22:47:03,429 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:47:03,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:47:03,761 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 97 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2019-11-06 22:47:03,761 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510825358] [2019-11-06 22:47:03,762 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883404875] [2019-11-06 22:47:03,762 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 [2019-11-06 22:47:03,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:47:03,877 INFO L256 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 22:47:03,894 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:47:03,939 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:47:04,048 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 172 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:47:04,049 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:47:04,079 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:47:04,228 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 172 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:47:04,229 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [674367177] [2019-11-06 22:47:04,233 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 251 [2019-11-06 22:47:04,280 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-06 22:47:04,280 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2)