/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/Problem15_label53.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 22:53:18,536 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 22:53:18,538 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 22:53:18,553 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-06 22:53:18,575 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 22:53:18,576 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 22:53:18,577 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 22:53:18,578 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 22:53:18,582 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 22:53:18,585 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 22:53:18,587 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 22:53:18,589 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 22:53:18,591 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 22:53:18,593 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 22:53:18,594 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 22:53:18,596 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 22:53:18,599 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 22:53:18,613 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 22:53:18,616 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 22:53:18,617 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 22:53:18,618 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 22:53:18,651 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 22:53:18,652 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 22:53:18,658 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 22:53:18,658 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 22:53:18,658 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 22:53:18,659 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 22:53:18,659 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 22:53:18,659 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 22:53:18,659 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 22:53:18,659 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 22:53:18,659 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 22:53:18,660 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 22:53:18,660 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 22:53:18,660 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 22:53:18,660 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 22:53:18,660 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 22:53:18,661 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 22:53:18,664 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 22:53:18,664 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 22:53:18,664 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 22:53:18,665 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 22:53:18,665 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 22:53:18,665 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 22:53:18,665 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 22:53:18,665 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 22:53:18,666 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 22:53:18,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 22:53:18,666 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 22:53:18,666 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 22:53:18,959 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 22:53:18,980 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 22:53:18,984 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 22:53:18,986 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 22:53:18,986 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 22:53:18,987 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem15_label53.c [2019-11-06 22:53:19,060 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1598148a7/ae433bcdf67f494da63b69282adda465/FLAG162ae5a93 [2019-11-06 22:53:19,751 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 22:53:19,752 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem15_label53.c [2019-11-06 22:53:19,774 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1598148a7/ae433bcdf67f494da63b69282adda465/FLAG162ae5a93 [2019-11-06 22:53:19,897 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1598148a7/ae433bcdf67f494da63b69282adda465 [2019-11-06 22:53:19,908 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 22:53:19,909 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 22:53:19,910 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 22:53:19,911 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 22:53:19,915 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 22:53:19,916 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:53:19" (1/1) ... [2019-11-06 22:53:19,919 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1edc095c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:53:19, skipping insertion in model container [2019-11-06 22:53:19,919 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:53:19" (1/1) ... [2019-11-06 22:53:19,927 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 22:53:20,009 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 22:53:20,967 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:53:20,983 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 22:53:21,461 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:53:21,482 INFO L192 MainTranslator]: Completed translation [2019-11-06 22:53:21,482 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:53:21 WrapperNode [2019-11-06 22:53:21,483 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 22:53:21,483 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 22:53:21,484 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 22:53:21,484 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 22:53:21,502 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:53:21" (1/1) ... [2019-11-06 22:53:21,502 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:53:21" (1/1) ... [2019-11-06 22:53:21,565 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:53:21" (1/1) ... [2019-11-06 22:53:21,565 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:53:21" (1/1) ... [2019-11-06 22:53:21,647 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:53:21" (1/1) ... [2019-11-06 22:53:21,678 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:53:21" (1/1) ... [2019-11-06 22:53:21,696 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:53:21" (1/1) ... [2019-11-06 22:53:21,716 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 22:53:21,717 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 22:53:21,717 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 22:53:21,717 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 22:53:21,721 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:53:21" (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 22:53:21,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 22:53:21,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 22:53:21,786 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-06 22:53:21,787 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-11-06 22:53:21,787 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 22:53:21,787 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-06 22:53:21,787 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-11-06 22:53:21,788 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 22:53:21,788 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 22:53:21,788 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-06 22:53:21,788 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 22:53:21,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 22:53:21,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 22:53:25,132 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 22:53:25,132 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 22:53:25,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:53:25 BoogieIcfgContainer [2019-11-06 22:53:25,137 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 22:53:25,138 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 22:53:25,139 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 22:53:25,144 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 22:53:25,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:53:19" (1/3) ... [2019-11-06 22:53:25,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@314612e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:53:25, skipping insertion in model container [2019-11-06 22:53:25,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:53:21" (2/3) ... [2019-11-06 22:53:25,146 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@314612e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:53:25, skipping insertion in model container [2019-11-06 22:53:25,146 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:53:25" (3/3) ... [2019-11-06 22:53:25,152 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem15_label53.c [2019-11-06 22:53:25,165 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 22:53:25,177 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 22:53:25,189 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 22:53:25,231 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 22:53:25,231 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 22:53:25,231 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 22:53:25,232 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 22:53:25,232 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 22:53:25,232 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 22:53:25,232 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 22:53:25,232 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 22:53:25,267 INFO L276 IsEmpty]: Start isEmpty. Operand 437 states. [2019-11-06 22:53:25,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-06 22:53:25,274 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:53:25,275 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] [2019-11-06 22:53:25,277 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:53:25,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:53:25,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1056547171, now seen corresponding path program 1 times [2019-11-06 22:53:25,292 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:53:25,292 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346345812] [2019-11-06 22:53:25,293 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:53:25,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:53:25,658 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 22:53:25,658 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346345812] [2019-11-06 22:53:25,659 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:53:25,659 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 22:53:25,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370362344] [2019-11-06 22:53:25,666 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:53:25,668 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:53:25,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:53:25,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 22:53:25,686 INFO L87 Difference]: Start difference. First operand 437 states. Second operand 4 states. [2019-11-06 22:53:32,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:53:32,605 INFO L93 Difference]: Finished difference Result 1546 states and 2831 transitions. [2019-11-06 22:53:32,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 22:53:32,607 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 53 [2019-11-06 22:53:32,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:53:32,643 INFO L225 Difference]: With dead ends: 1546 [2019-11-06 22:53:32,644 INFO L226 Difference]: Without dead ends: 1028 [2019-11-06 22:53:32,652 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 22:53:32,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1028 states. [2019-11-06 22:53:32,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1028 to 700. [2019-11-06 22:53:32,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 700 states. [2019-11-06 22:53:32,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 700 states to 700 states and 1110 transitions. [2019-11-06 22:53:32,766 INFO L78 Accepts]: Start accepts. Automaton has 700 states and 1110 transitions. Word has length 53 [2019-11-06 22:53:32,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:53:32,767 INFO L462 AbstractCegarLoop]: Abstraction has 700 states and 1110 transitions. [2019-11-06 22:53:32,767 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 22:53:32,767 INFO L276 IsEmpty]: Start isEmpty. Operand 700 states and 1110 transitions. [2019-11-06 22:53:32,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2019-11-06 22:53:32,774 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:53:32,774 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, 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 22:53:32,775 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:53:32,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:53:32,775 INFO L82 PathProgramCache]: Analyzing trace with hash -602725951, now seen corresponding path program 1 times [2019-11-06 22:53:32,775 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:53:32,776 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902671999] [2019-11-06 22:53:32,776 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:53:32,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:53:32,940 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:53:32,941 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902671999] [2019-11-06 22:53:32,941 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:53:32,941 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-06 22:53:32,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091662424] [2019-11-06 22:53:32,948 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 22:53:32,948 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:53:32,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 22:53:32,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-06 22:53:32,949 INFO L87 Difference]: Start difference. First operand 700 states and 1110 transitions. Second operand 5 states. [2019-11-06 22:53:38,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:53:38,587 INFO L93 Difference]: Finished difference Result 2057 states and 3297 transitions. [2019-11-06 22:53:38,589 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 22:53:38,589 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 125 [2019-11-06 22:53:38,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:53:38,601 INFO L225 Difference]: With dead ends: 2057 [2019-11-06 22:53:38,602 INFO L226 Difference]: Without dead ends: 1363 [2019-11-06 22:53:38,605 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-11-06 22:53:38,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1363 states. [2019-11-06 22:53:38,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1363 to 1333. [2019-11-06 22:53:38,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1333 states. [2019-11-06 22:53:38,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1333 states to 1333 states and 1846 transitions. [2019-11-06 22:53:38,670 INFO L78 Accepts]: Start accepts. Automaton has 1333 states and 1846 transitions. Word has length 125 [2019-11-06 22:53:38,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:53:38,671 INFO L462 AbstractCegarLoop]: Abstraction has 1333 states and 1846 transitions. [2019-11-06 22:53:38,671 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 22:53:38,671 INFO L276 IsEmpty]: Start isEmpty. Operand 1333 states and 1846 transitions. [2019-11-06 22:53:38,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2019-11-06 22:53:38,675 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:53:38,676 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, 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 22:53:38,676 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:53:38,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:53:38,677 INFO L82 PathProgramCache]: Analyzing trace with hash 741212625, now seen corresponding path program 1 times [2019-11-06 22:53:38,677 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:53:38,677 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560299237] [2019-11-06 22:53:38,677 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:53:38,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:53:38,931 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:53:38,931 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560299237] [2019-11-06 22:53:38,931 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:53:38,932 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 22:53:38,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364102190] [2019-11-06 22:53:38,933 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 22:53:38,933 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:53:38,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 22:53:38,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:53:38,934 INFO L87 Difference]: Start difference. First operand 1333 states and 1846 transitions. Second operand 6 states. [2019-11-06 22:53:47,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:53:47,808 INFO L93 Difference]: Finished difference Result 6402 states and 9367 transitions. [2019-11-06 22:53:47,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 22:53:47,813 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 133 [2019-11-06 22:53:47,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:53:47,845 INFO L225 Difference]: With dead ends: 6402 [2019-11-06 22:53:47,845 INFO L226 Difference]: Without dead ends: 5075 [2019-11-06 22:53:47,851 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:53:47,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5075 states. [2019-11-06 22:53:48,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5075 to 4748. [2019-11-06 22:53:48,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4748 states. [2019-11-06 22:53:48,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4748 states to 4748 states and 6574 transitions. [2019-11-06 22:53:48,036 INFO L78 Accepts]: Start accepts. Automaton has 4748 states and 6574 transitions. Word has length 133 [2019-11-06 22:53:48,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:53:48,038 INFO L462 AbstractCegarLoop]: Abstraction has 4748 states and 6574 transitions. [2019-11-06 22:53:48,039 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 22:53:48,039 INFO L276 IsEmpty]: Start isEmpty. Operand 4748 states and 6574 transitions. [2019-11-06 22:53:48,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2019-11-06 22:53:48,054 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:53:48,054 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, 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] [2019-11-06 22:53:48,055 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:53:48,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:53:48,055 INFO L82 PathProgramCache]: Analyzing trace with hash 1520888321, now seen corresponding path program 1 times [2019-11-06 22:53:48,056 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:53:48,056 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886648999] [2019-11-06 22:53:48,056 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:53:48,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:53:48,347 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 95 proven. 0 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-11-06 22:53:48,347 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886648999] [2019-11-06 22:53:48,347 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:53:48,348 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 22:53:48,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003044851] [2019-11-06 22:53:48,349 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:53:48,350 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:53:48,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:53:48,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 22:53:48,350 INFO L87 Difference]: Start difference. First operand 4748 states and 6574 transitions. Second operand 4 states. [2019-11-06 22:53:53,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:53:53,406 INFO L93 Difference]: Finished difference Result 18433 states and 26449 transitions. [2019-11-06 22:53:53,406 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 22:53:53,407 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 211 [2019-11-06 22:53:53,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:53:53,478 INFO L225 Difference]: With dead ends: 18433 [2019-11-06 22:53:53,478 INFO L226 Difference]: Without dead ends: 13691 [2019-11-06 22:53:53,495 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 22:53:53,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13691 states. [2019-11-06 22:53:53,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13691 to 11845. [2019-11-06 22:53:53,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11845 states. [2019-11-06 22:53:53,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11845 states to 11845 states and 15841 transitions. [2019-11-06 22:53:53,876 INFO L78 Accepts]: Start accepts. Automaton has 11845 states and 15841 transitions. Word has length 211 [2019-11-06 22:53:53,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:53:53,878 INFO L462 AbstractCegarLoop]: Abstraction has 11845 states and 15841 transitions. [2019-11-06 22:53:53,878 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 22:53:53,878 INFO L276 IsEmpty]: Start isEmpty. Operand 11845 states and 15841 transitions. [2019-11-06 22:53:53,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 447 [2019-11-06 22:53:53,894 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:53:53,895 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, 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, 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, 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, 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 22:53:53,895 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:53:53,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:53:53,896 INFO L82 PathProgramCache]: Analyzing trace with hash 888259648, now seen corresponding path program 1 times [2019-11-06 22:53:53,896 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:53:53,897 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26215469] [2019-11-06 22:53:53,897 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:53:54,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:53:54,477 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 0 proven. 86 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2019-11-06 22:53:54,478 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26215469] [2019-11-06 22:53:54,478 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365612609] [2019-11-06 22:53:54,478 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 22:53:54,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:53:54,649 INFO L256 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 22:53:54,668 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:53:55,091 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 0 proven. 86 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2019-11-06 22:53:55,091 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:53:56,031 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2019-11-06 22:53:56,031 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-06 22:53:56,032 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 4] total 7 [2019-11-06 22:53:56,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186097742] [2019-11-06 22:53:56,033 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:53:56,033 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:53:56,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:53:56,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 22:53:56,034 INFO L87 Difference]: Start difference. First operand 11845 states and 15841 transitions. Second operand 4 states.