/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf --traceabstraction.order.of.the.error.locations.to.be.checked PROGRAM_FIRST -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -i ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_41-trylock_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-24 12:43:51,163 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-24 12:43:51,214 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf [2023-08-24 12:43:51,218 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-24 12:43:51,218 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-24 12:43:51,242 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-24 12:43:51,243 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-24 12:43:51,244 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-24 12:43:51,244 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-24 12:43:51,244 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-24 12:43:51,245 INFO L153 SettingsManager]: * Use SBE=true [2023-08-24 12:43:51,245 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-24 12:43:51,245 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-24 12:43:51,246 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-24 12:43:51,246 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-24 12:43:51,246 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-24 12:43:51,247 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-24 12:43:51,247 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-24 12:43:51,247 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-24 12:43:51,248 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-24 12:43:51,248 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-24 12:43:51,251 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-24 12:43:51,251 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-24 12:43:51,252 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-24 12:43:51,256 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-24 12:43:51,256 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-24 12:43:51,256 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-24 12:43:51,257 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-24 12:43:51,257 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-24 12:43:51,257 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-24 12:43:51,257 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-24 12:43:51,258 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-24 12:43:51,258 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-24 12:43:51,258 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-24 12:43:51,258 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-24 12:43:51,259 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST [2023-08-24 12:43:51,558 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-24 12:43:51,578 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-24 12:43:51,581 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-24 12:43:51,582 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-24 12:43:51,583 INFO L274 PluginConnector]: CDTParser initialized [2023-08-24 12:43:51,587 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_41-trylock_racefree.i [2023-08-24 12:43:52,729 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-24 12:43:53,061 INFO L384 CDTParser]: Found 1 translation units. [2023-08-24 12:43:53,061 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_41-trylock_racefree.i [2023-08-24 12:43:53,073 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e0116e9ec/d91806406dc6427686fa7a7d786fab0c/FLAGe8d050fc7 [2023-08-24 12:43:53,091 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e0116e9ec/d91806406dc6427686fa7a7d786fab0c [2023-08-24 12:43:53,095 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-24 12:43:53,097 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-24 12:43:53,100 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-24 12:43:53,100 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-24 12:43:53,103 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-24 12:43:53,104 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,105 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fdab027 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53, skipping insertion in model container [2023-08-24 12:43:53,105 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,158 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-24 12:43:53,480 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_41-trylock_racefree.i[30176,30189] [2023-08-24 12:43:53,498 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-24 12:43:53,508 INFO L201 MainTranslator]: Completed pre-run [2023-08-24 12:43:53,524 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-24 12:43:53,525 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-24 12:43:53,536 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_41-trylock_racefree.i[30176,30189] [2023-08-24 12:43:53,542 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-24 12:43:53,575 INFO L206 MainTranslator]: Completed translation [2023-08-24 12:43:53,576 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53 WrapperNode [2023-08-24 12:43:53,576 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-24 12:43:53,577 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-24 12:43:53,577 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-24 12:43:53,577 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-24 12:43:53,583 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,594 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,616 INFO L138 Inliner]: procedures = 171, calls = 30, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 79 [2023-08-24 12:43:53,616 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-24 12:43:53,617 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-24 12:43:53,617 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-24 12:43:53,617 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-24 12:43:53,624 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,624 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,626 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,626 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,638 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,641 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,643 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,644 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,651 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-24 12:43:53,651 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-24 12:43:53,651 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-24 12:43:53,652 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-24 12:43:53,652 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53" (1/1) ... [2023-08-24 12:43:53,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-24 12:43:53,677 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:43:53,686 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-24 12:43:53,688 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-24 12:43:53,710 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-24 12:43:53,710 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-24 12:43:53,710 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-24 12:43:53,710 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-24 12:43:53,710 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-24 12:43:53,711 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-24 12:43:53,711 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-24 12:43:53,711 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-24 12:43:53,711 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexTryLock [2023-08-24 12:43:53,711 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-24 12:43:53,711 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-24 12:43:53,711 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-24 12:43:53,712 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-24 12:43:53,821 INFO L236 CfgBuilder]: Building ICFG [2023-08-24 12:43:53,823 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-24 12:43:54,059 INFO L277 CfgBuilder]: Performing block encoding [2023-08-24 12:43:54,067 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-24 12:43:54,067 INFO L302 CfgBuilder]: Removed 11 assume(true) statements. [2023-08-24 12:43:54,070 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.08 12:43:54 BoogieIcfgContainer [2023-08-24 12:43:54,070 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-24 12:43:54,072 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-24 12:43:54,072 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-24 12:43:54,074 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-24 12:43:54,075 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.08 12:43:53" (1/3) ... [2023-08-24 12:43:54,075 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6dccbff6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.08 12:43:54, skipping insertion in model container [2023-08-24 12:43:54,076 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:43:53" (2/3) ... [2023-08-24 12:43:54,076 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6dccbff6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.08 12:43:54, skipping insertion in model container [2023-08-24 12:43:54,077 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.08 12:43:54" (3/3) ... [2023-08-24 12:43:54,078 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_41-trylock_racefree.i [2023-08-24 12:43:54,094 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-24 12:43:54,094 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-08-24 12:43:54,094 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-24 12:43:54,170 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-24 12:43:54,209 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 94 places, 105 transitions, 218 flow [2023-08-24 12:43:54,279 INFO L124 PetriNetUnfolderBase]: 21/144 cut-off events. [2023-08-24 12:43:54,280 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-24 12:43:54,287 INFO L83 FinitePrefix]: Finished finitePrefix Result has 150 conditions, 144 events. 21/144 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 343 event pairs, 0 based on Foata normal form. 0/118 useless extension candidates. Maximal degree in co-relation 72. Up to 6 conditions per place. [2023-08-24 12:43:54,287 INFO L82 GeneralOperation]: Start removeDead. Operand has 94 places, 105 transitions, 218 flow [2023-08-24 12:43:54,292 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 90 places, 100 transitions, 205 flow [2023-08-24 12:43:54,295 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:43:54,307 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 90 places, 100 transitions, 205 flow [2023-08-24 12:43:54,310 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 90 places, 100 transitions, 205 flow [2023-08-24 12:43:54,311 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 90 places, 100 transitions, 205 flow [2023-08-24 12:43:54,356 INFO L124 PetriNetUnfolderBase]: 20/139 cut-off events. [2023-08-24 12:43:54,357 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:43:54,358 INFO L83 FinitePrefix]: Finished finitePrefix Result has 144 conditions, 139 events. 20/139 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 339 event pairs, 0 based on Foata normal form. 0/113 useless extension candidates. Maximal degree in co-relation 72. Up to 6 conditions per place. [2023-08-24 12:43:54,361 INFO L119 LiptonReduction]: Number of co-enabled transitions 2520 [2023-08-24 12:43:56,648 INFO L134 LiptonReduction]: Checked pairs total: 3938 [2023-08-24 12:43:56,648 INFO L136 LiptonReduction]: Total number of compositions: 82 [2023-08-24 12:43:56,661 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:43:56,666 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5223ec75, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:43:56,667 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:43:56,670 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:43:56,670 INFO L124 PetriNetUnfolderBase]: 3/18 cut-off events. [2023-08-24 12:43:56,670 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:43:56,670 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:43:56,671 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-24 12:43:56,671 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:43:56,675 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:43:56,676 INFO L85 PathProgramCache]: Analyzing trace with hash 392114195, now seen corresponding path program 1 times [2023-08-24 12:43:56,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:43:56,684 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678897608] [2023-08-24 12:43:56,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:43:56,685 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:43:56,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:43:56,869 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:43:56,869 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:43:56,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678897608] [2023-08-24 12:43:56,870 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678897608] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:43:56,871 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:43:56,871 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:43:56,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407124977] [2023-08-24 12:43:56,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:43:56,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:43:56,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:43:56,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:43:56,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:43:56,909 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 82 out of 187 [2023-08-24 12:43:56,913 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 34 transitions, 73 flow. Second operand has 3 states, 3 states have (on average 83.33333333333333) internal successors, (250), 3 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:43:56,913 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:43:56,913 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 82 of 187 [2023-08-24 12:43:56,914 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:43:57,020 INFO L124 PetriNetUnfolderBase]: 89/209 cut-off events. [2023-08-24 12:43:57,020 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:43:57,023 INFO L83 FinitePrefix]: Finished finitePrefix Result has 413 conditions, 209 events. 89/209 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 842 event pairs, 0 based on Foata normal form. 20/193 useless extension candidates. Maximal degree in co-relation 384. Up to 180 conditions per place. [2023-08-24 12:43:57,025 INFO L140 encePairwiseOnDemand]: 175/187 looper letters, 22 selfloop transitions, 2 changer transitions 7/33 dead transitions. [2023-08-24 12:43:57,025 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 28 places, 33 transitions, 131 flow [2023-08-24 12:43:57,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:43:57,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:43:57,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 292 transitions. [2023-08-24 12:43:57,046 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5204991087344029 [2023-08-24 12:43:57,046 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 292 transitions. [2023-08-24 12:43:57,047 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 292 transitions. [2023-08-24 12:43:57,049 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:43:57,052 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 292 transitions. [2023-08-24 12:43:57,057 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 97.33333333333333) internal successors, (292), 3 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:43:57,062 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 187.0) internal successors, (748), 4 states have internal predecessors, (748), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:43:57,063 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 187.0) internal successors, (748), 4 states have internal predecessors, (748), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:43:57,065 INFO L175 Difference]: Start difference. First operand has 27 places, 34 transitions, 73 flow. Second operand 3 states and 292 transitions. [2023-08-24 12:43:57,066 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 28 places, 33 transitions, 131 flow [2023-08-24 12:43:57,068 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 33 transitions, 131 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-24 12:43:57,070 INFO L231 Difference]: Finished difference. Result has 29 places, 18 transitions, 47 flow [2023-08-24 12:43:57,071 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=187, PETRI_DIFFERENCE_MINUEND_FLOW=53, PETRI_DIFFERENCE_MINUEND_PLACES=26, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=24, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=47, PETRI_PLACES=29, PETRI_TRANSITIONS=18} [2023-08-24 12:43:57,074 INFO L281 CegarLoopForPetriNet]: 27 programPoint places, 2 predicate places. [2023-08-24 12:43:57,075 INFO L495 AbstractCegarLoop]: Abstraction has has 29 places, 18 transitions, 47 flow [2023-08-24 12:43:57,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 83.33333333333333) internal successors, (250), 3 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:43:57,075 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:43:57,075 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:43:57,076 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-24 12:43:57,076 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:43:57,084 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:43:57,084 INFO L85 PathProgramCache]: Analyzing trace with hash -1261871786, now seen corresponding path program 1 times [2023-08-24 12:43:57,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:43:57,085 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327500358] [2023-08-24 12:43:57,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:43:57,085 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:43:57,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:43:57,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:43:57,208 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:43:57,209 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327500358] [2023-08-24 12:43:57,209 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327500358] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:43:57,209 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338817333] [2023-08-24 12:43:57,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:43:57,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:43:57,209 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:43:57,222 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-24 12:43:57,284 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-24 12:43:57,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:43:57,336 INFO L262 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-24 12:43:57,339 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:43:57,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:43:57,373 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:43:57,393 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:43:57,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338817333] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:43:57,393 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:43:57,393 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-24 12:43:57,394 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82099300] [2023-08-24 12:43:57,394 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:43:57,395 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-24 12:43:57,395 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:43:57,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-24 12:43:57,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-24 12:43:57,397 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 82 out of 187 [2023-08-24 12:43:57,398 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 18 transitions, 47 flow. Second operand has 7 states, 7 states have (on average 84.28571428571429) internal successors, (590), 7 states have internal predecessors, (590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:43:57,399 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:43:57,399 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 82 of 187 [2023-08-24 12:43:57,399 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:43:57,449 INFO L124 PetriNetUnfolderBase]: 16/46 cut-off events. [2023-08-24 12:43:57,450 INFO L125 PetriNetUnfolderBase]: For 8/8 co-relation queries the response was YES. [2023-08-24 12:43:57,450 INFO L83 FinitePrefix]: Finished finitePrefix Result has 117 conditions, 46 events. 16/46 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 84 event pairs, 0 based on Foata normal form. 9/55 useless extension candidates. Maximal degree in co-relation 103. Up to 34 conditions per place. [2023-08-24 12:43:57,450 INFO L140 encePairwiseOnDemand]: 184/187 looper letters, 0 selfloop transitions, 0 changer transitions 22/22 dead transitions. [2023-08-24 12:43:57,450 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 22 transitions, 95 flow [2023-08-24 12:43:57,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-24 12:43:57,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-24 12:43:57,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 350 transitions. [2023-08-24 12:43:57,453 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4679144385026738 [2023-08-24 12:43:57,453 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 350 transitions. [2023-08-24 12:43:57,453 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 350 transitions. [2023-08-24 12:43:57,453 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:43:57,453 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 350 transitions. [2023-08-24 12:43:57,456 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 87.5) internal successors, (350), 4 states have internal predecessors, (350), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:43:57,459 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 187.0) internal successors, (935), 5 states have internal predecessors, (935), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:43:57,460 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 187.0) internal successors, (935), 5 states have internal predecessors, (935), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:43:57,460 INFO L175 Difference]: Start difference. First operand has 29 places, 18 transitions, 47 flow. Second operand 4 states and 350 transitions. [2023-08-24 12:43:57,460 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 22 transitions, 95 flow [2023-08-24 12:43:57,461 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 19 places, 22 transitions, 89 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-24 12:43:57,462 INFO L231 Difference]: Finished difference. Result has 19 places, 0 transitions, 0 flow [2023-08-24 12:43:57,462 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=187, PETRI_DIFFERENCE_MINUEND_FLOW=29, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=13, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=19, PETRI_TRANSITIONS=0} [2023-08-24 12:43:57,462 INFO L281 CegarLoopForPetriNet]: 27 programPoint places, -8 predicate places. [2023-08-24 12:43:57,463 INFO L495 AbstractCegarLoop]: Abstraction has has 19 places, 0 transitions, 0 flow [2023-08-24 12:43:57,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 84.28571428571429) internal successors, (590), 7 states have internal predecessors, (590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:43:57,465 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-24 12:43:57,474 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-08-24 12:43:57,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:43:57,671 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-24 12:43:57,673 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-24 12:43:57,678 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 94 places, 105 transitions, 218 flow [2023-08-24 12:43:57,691 INFO L124 PetriNetUnfolderBase]: 21/144 cut-off events. [2023-08-24 12:43:57,691 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-24 12:43:57,692 INFO L83 FinitePrefix]: Finished finitePrefix Result has 150 conditions, 144 events. 21/144 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 343 event pairs, 0 based on Foata normal form. 0/118 useless extension candidates. Maximal degree in co-relation 72. Up to 6 conditions per place. [2023-08-24 12:43:57,692 INFO L82 GeneralOperation]: Start removeDead. Operand has 94 places, 105 transitions, 218 flow [2023-08-24 12:43:57,694 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 90 places, 100 transitions, 205 flow [2023-08-24 12:43:57,694 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:43:57,694 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 90 places, 100 transitions, 205 flow [2023-08-24 12:43:57,694 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 90 places, 100 transitions, 205 flow [2023-08-24 12:43:57,694 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 90 places, 100 transitions, 205 flow [2023-08-24 12:43:57,706 INFO L124 PetriNetUnfolderBase]: 20/139 cut-off events. [2023-08-24 12:43:57,707 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:43:57,707 INFO L83 FinitePrefix]: Finished finitePrefix Result has 144 conditions, 139 events. 20/139 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 339 event pairs, 0 based on Foata normal form. 0/113 useless extension candidates. Maximal degree in co-relation 72. Up to 6 conditions per place. [2023-08-24 12:43:57,709 INFO L119 LiptonReduction]: Number of co-enabled transitions 2520 [2023-08-24 12:43:59,668 INFO L134 LiptonReduction]: Checked pairs total: 4022 [2023-08-24 12:43:59,668 INFO L136 LiptonReduction]: Total number of compositions: 81 [2023-08-24 12:43:59,670 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-24 12:43:59,671 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5223ec75, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:43:59,671 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:43:59,674 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:43:59,674 INFO L124 PetriNetUnfolderBase]: 3/21 cut-off events. [2023-08-24 12:43:59,674 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:43:59,674 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:43:59,674 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-24 12:43:59,675 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-24 12:43:59,675 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:43:59,675 INFO L85 PathProgramCache]: Analyzing trace with hash 1681920538, now seen corresponding path program 1 times [2023-08-24 12:43:59,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:43:59,675 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58922516] [2023-08-24 12:43:59,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:43:59,676 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:43:59,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:43:59,713 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-24 12:43:59,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:43:59,742 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-24 12:43:59,743 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-24 12:43:59,743 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-24 12:43:59,743 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-08-24 12:43:59,743 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-24 12:43:59,744 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-24 12:43:59,744 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-24 12:43:59,744 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-24 12:43:59,761 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-24 12:43:59,763 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 119 places, 135 transitions, 288 flow [2023-08-24 12:43:59,781 INFO L124 PetriNetUnfolderBase]: 37/238 cut-off events. [2023-08-24 12:43:59,782 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-24 12:43:59,783 INFO L83 FinitePrefix]: Finished finitePrefix Result has 252 conditions, 238 events. 37/238 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 698 event pairs, 0 based on Foata normal form. 0/194 useless extension candidates. Maximal degree in co-relation 146. Up to 9 conditions per place. [2023-08-24 12:43:59,783 INFO L82 GeneralOperation]: Start removeDead. Operand has 119 places, 135 transitions, 288 flow [2023-08-24 12:43:59,784 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 119 places, 135 transitions, 288 flow [2023-08-24 12:43:59,785 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:43:59,785 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 119 places, 135 transitions, 288 flow [2023-08-24 12:43:59,785 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 119 places, 135 transitions, 288 flow [2023-08-24 12:43:59,785 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 119 places, 135 transitions, 288 flow [2023-08-24 12:43:59,803 INFO L124 PetriNetUnfolderBase]: 37/238 cut-off events. [2023-08-24 12:43:59,803 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-24 12:43:59,804 INFO L83 FinitePrefix]: Finished finitePrefix Result has 252 conditions, 238 events. 37/238 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 698 event pairs, 0 based on Foata normal form. 0/194 useless extension candidates. Maximal degree in co-relation 146. Up to 9 conditions per place. [2023-08-24 12:43:59,809 INFO L119 LiptonReduction]: Number of co-enabled transitions 7224 [2023-08-24 12:44:01,896 INFO L134 LiptonReduction]: Checked pairs total: 14956 [2023-08-24 12:44:01,897 INFO L136 LiptonReduction]: Total number of compositions: 94 [2023-08-24 12:44:01,898 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:44:01,899 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5223ec75, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:44:01,899 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:44:01,901 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:44:01,902 INFO L124 PetriNetUnfolderBase]: 4/19 cut-off events. [2023-08-24 12:44:01,902 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:44:01,902 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:44:01,902 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-24 12:44:01,902 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:44:01,902 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:44:01,902 INFO L85 PathProgramCache]: Analyzing trace with hash 716491871, now seen corresponding path program 1 times [2023-08-24 12:44:01,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:44:01,903 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711165613] [2023-08-24 12:44:01,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:44:01,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:44:01,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:44:01,960 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:44:01,960 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:44:01,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711165613] [2023-08-24 12:44:01,960 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711165613] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:44:01,960 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:44:01,960 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:44:01,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564803845] [2023-08-24 12:44:01,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:44:01,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:44:01,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:44:01,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:44:01,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:44:01,967 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 104 out of 229 [2023-08-24 12:44:01,968 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 46 places, 59 transitions, 136 flow. Second operand has 3 states, 3 states have (on average 105.66666666666667) internal successors, (317), 3 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:01,968 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:44:01,968 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 104 of 229 [2023-08-24 12:44:01,968 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:44:02,244 INFO L124 PetriNetUnfolderBase]: 1665/2906 cut-off events. [2023-08-24 12:44:02,245 INFO L125 PetriNetUnfolderBase]: For 45/45 co-relation queries the response was YES. [2023-08-24 12:44:02,248 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5646 conditions, 2906 events. 1665/2906 cut-off events. For 45/45 co-relation queries the response was YES. Maximal size of possible extension queue 106. Compared 17016 event pairs, 736 based on Foata normal form. 442/2985 useless extension candidates. Maximal degree in co-relation 659. Up to 2666 conditions per place. [2023-08-24 12:44:02,256 INFO L140 encePairwiseOnDemand]: 211/229 looper letters, 32 selfloop transitions, 2 changer transitions 10/52 dead transitions. [2023-08-24 12:44:02,256 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 47 places, 52 transitions, 206 flow [2023-08-24 12:44:02,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:44:02,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:44:02,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 376 transitions. [2023-08-24 12:44:02,258 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5473071324599709 [2023-08-24 12:44:02,258 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 376 transitions. [2023-08-24 12:44:02,258 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 376 transitions. [2023-08-24 12:44:02,258 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:44:02,258 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 376 transitions. [2023-08-24 12:44:02,259 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 125.33333333333333) internal successors, (376), 3 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:02,261 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 229.0) internal successors, (916), 4 states have internal predecessors, (916), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:02,262 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 229.0) internal successors, (916), 4 states have internal predecessors, (916), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:02,262 INFO L175 Difference]: Start difference. First operand has 46 places, 59 transitions, 136 flow. Second operand 3 states and 376 transitions. [2023-08-24 12:44:02,262 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 47 places, 52 transitions, 206 flow [2023-08-24 12:44:02,264 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 47 places, 52 transitions, 206 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-24 12:44:02,265 INFO L231 Difference]: Finished difference. Result has 48 places, 34 transitions, 86 flow [2023-08-24 12:44:02,265 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=229, PETRI_DIFFERENCE_MINUEND_FLOW=104, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=43, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=41, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=86, PETRI_PLACES=48, PETRI_TRANSITIONS=34} [2023-08-24 12:44:02,266 INFO L281 CegarLoopForPetriNet]: 46 programPoint places, 2 predicate places. [2023-08-24 12:44:02,269 INFO L495 AbstractCegarLoop]: Abstraction has has 48 places, 34 transitions, 86 flow [2023-08-24 12:44:02,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 105.66666666666667) internal successors, (317), 3 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:02,274 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:44:02,274 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:44:02,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-24 12:44:02,275 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:44:02,276 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:44:02,276 INFO L85 PathProgramCache]: Analyzing trace with hash -135273332, now seen corresponding path program 1 times [2023-08-24 12:44:02,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:44:02,279 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193299542] [2023-08-24 12:44:02,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:44:02,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:44:02,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:44:02,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:44:02,346 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:44:02,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193299542] [2023-08-24 12:44:02,346 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193299542] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:44:02,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043936968] [2023-08-24 12:44:02,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:44:02,347 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:44:02,347 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:44:02,349 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-24 12:44:02,372 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-24 12:44:02,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:44:02,422 INFO L262 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-24 12:44:02,424 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:44:02,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:44:02,445 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:44:02,471 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:44:02,471 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2043936968] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:44:02,471 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:44:02,471 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-24 12:44:02,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255672233] [2023-08-24 12:44:02,472 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:44:02,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-24 12:44:02,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:44:02,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-24 12:44:02,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-24 12:44:02,473 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 104 out of 229 [2023-08-24 12:44:02,488 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 34 transitions, 86 flow. Second operand has 7 states, 7 states have (on average 106.42857142857143) internal successors, (745), 7 states have internal predecessors, (745), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:02,488 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:44:02,488 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 104 of 229 [2023-08-24 12:44:02,489 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:44:02,586 INFO L124 PetriNetUnfolderBase]: 331/599 cut-off events. [2023-08-24 12:44:02,586 INFO L125 PetriNetUnfolderBase]: For 99/99 co-relation queries the response was YES. [2023-08-24 12:44:02,587 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1293 conditions, 599 events. 331/599 cut-off events. For 99/99 co-relation queries the response was YES. Maximal size of possible extension queue 31. Compared 2742 event pairs, 50 based on Foata normal form. 80/676 useless extension candidates. Maximal degree in co-relation 905. Up to 398 conditions per place. [2023-08-24 12:44:02,588 INFO L140 encePairwiseOnDemand]: 226/229 looper letters, 0 selfloop transitions, 0 changer transitions 53/53 dead transitions. [2023-08-24 12:44:02,588 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 53 transitions, 212 flow [2023-08-24 12:44:02,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-24 12:44:02,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-24 12:44:02,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 567 transitions. [2023-08-24 12:44:02,590 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.49519650655021835 [2023-08-24 12:44:02,590 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 567 transitions. [2023-08-24 12:44:02,590 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 567 transitions. [2023-08-24 12:44:02,590 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:44:02,590 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 567 transitions. [2023-08-24 12:44:02,592 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 113.4) internal successors, (567), 5 states have internal predecessors, (567), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:02,594 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 229.0) internal successors, (1374), 6 states have internal predecessors, (1374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:02,594 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 229.0) internal successors, (1374), 6 states have internal predecessors, (1374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:02,595 INFO L175 Difference]: Start difference. First operand has 48 places, 34 transitions, 86 flow. Second operand 5 states and 567 transitions. [2023-08-24 12:44:02,595 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 53 transitions, 212 flow [2023-08-24 12:44:02,596 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 53 transitions, 210 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-24 12:44:02,596 INFO L231 Difference]: Finished difference. Result has 39 places, 0 transitions, 0 flow [2023-08-24 12:44:02,596 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=229, PETRI_DIFFERENCE_MINUEND_FLOW=72, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=39, PETRI_TRANSITIONS=0} [2023-08-24 12:44:02,599 INFO L281 CegarLoopForPetriNet]: 46 programPoint places, -7 predicate places. [2023-08-24 12:44:02,599 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 0 transitions, 0 flow [2023-08-24 12:44:02,599 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 106.42857142857143) internal successors, (745), 7 states have internal predecessors, (745), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:02,600 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-24 12:44:02,608 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-24 12:44:02,800 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:44:02,800 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-24 12:44:02,801 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-24 12:44:02,803 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 119 places, 135 transitions, 288 flow [2023-08-24 12:44:02,818 INFO L124 PetriNetUnfolderBase]: 37/238 cut-off events. [2023-08-24 12:44:02,819 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-24 12:44:02,820 INFO L83 FinitePrefix]: Finished finitePrefix Result has 252 conditions, 238 events. 37/238 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 698 event pairs, 0 based on Foata normal form. 0/194 useless extension candidates. Maximal degree in co-relation 146. Up to 9 conditions per place. [2023-08-24 12:44:02,820 INFO L82 GeneralOperation]: Start removeDead. Operand has 119 places, 135 transitions, 288 flow [2023-08-24 12:44:02,821 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 119 places, 135 transitions, 288 flow [2023-08-24 12:44:02,821 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:44:02,821 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 119 places, 135 transitions, 288 flow [2023-08-24 12:44:02,822 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 119 places, 135 transitions, 288 flow [2023-08-24 12:44:02,822 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 119 places, 135 transitions, 288 flow [2023-08-24 12:44:02,836 INFO L124 PetriNetUnfolderBase]: 37/238 cut-off events. [2023-08-24 12:44:02,837 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-24 12:44:02,838 INFO L83 FinitePrefix]: Finished finitePrefix Result has 252 conditions, 238 events. 37/238 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 698 event pairs, 0 based on Foata normal form. 0/194 useless extension candidates. Maximal degree in co-relation 146. Up to 9 conditions per place. [2023-08-24 12:44:02,842 INFO L119 LiptonReduction]: Number of co-enabled transitions 7224 [2023-08-24 12:44:04,890 INFO L134 LiptonReduction]: Checked pairs total: 16663 [2023-08-24 12:44:04,891 INFO L136 LiptonReduction]: Total number of compositions: 95 [2023-08-24 12:44:04,892 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-24 12:44:04,893 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5223ec75, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:44:04,893 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:44:04,898 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:44:04,898 INFO L124 PetriNetUnfolderBase]: 15/63 cut-off events. [2023-08-24 12:44:04,899 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-24 12:44:04,899 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:44:04,899 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-24 12:44:04,899 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-24 12:44:04,899 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:44:04,899 INFO L85 PathProgramCache]: Analyzing trace with hash 428784946, now seen corresponding path program 1 times [2023-08-24 12:44:04,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:44:04,900 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207883680] [2023-08-24 12:44:04,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:44:04,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:44:04,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:44:04,913 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-24 12:44:04,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:44:04,927 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-24 12:44:04,927 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-24 12:44:04,928 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-24 12:44:04,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-24 12:44:04,928 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-24 12:44:04,929 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-24 12:44:04,929 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-24 12:44:04,929 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-24 12:44:04,949 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-24 12:44:04,951 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 144 places, 165 transitions, 360 flow [2023-08-24 12:44:04,988 INFO L124 PetriNetUnfolderBase]: 58/365 cut-off events. [2023-08-24 12:44:04,988 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-24 12:44:04,991 INFO L83 FinitePrefix]: Finished finitePrefix Result has 393 conditions, 365 events. 58/365 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1192 event pairs, 1 based on Foata normal form. 0/299 useless extension candidates. Maximal degree in co-relation 246. Up to 16 conditions per place. [2023-08-24 12:44:04,991 INFO L82 GeneralOperation]: Start removeDead. Operand has 144 places, 165 transitions, 360 flow [2023-08-24 12:44:04,994 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 144 places, 165 transitions, 360 flow [2023-08-24 12:44:04,994 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:44:04,995 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 144 places, 165 transitions, 360 flow [2023-08-24 12:44:04,995 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 144 places, 165 transitions, 360 flow [2023-08-24 12:44:04,995 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 144 places, 165 transitions, 360 flow [2023-08-24 12:44:05,024 INFO L124 PetriNetUnfolderBase]: 58/365 cut-off events. [2023-08-24 12:44:05,024 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-24 12:44:05,029 INFO L83 FinitePrefix]: Finished finitePrefix Result has 393 conditions, 365 events. 58/365 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1192 event pairs, 1 based on Foata normal form. 0/299 useless extension candidates. Maximal degree in co-relation 246. Up to 16 conditions per place. [2023-08-24 12:44:05,040 INFO L119 LiptonReduction]: Number of co-enabled transitions 13440 [2023-08-24 12:44:07,274 INFO L134 LiptonReduction]: Checked pairs total: 33503 [2023-08-24 12:44:07,275 INFO L136 LiptonReduction]: Total number of compositions: 109 [2023-08-24 12:44:07,276 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:44:07,276 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5223ec75, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:44:07,276 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:44:07,278 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:44:07,278 INFO L124 PetriNetUnfolderBase]: 4/20 cut-off events. [2023-08-24 12:44:07,278 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:44:07,278 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:44:07,278 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-24 12:44:07,279 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:44:07,279 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:44:07,279 INFO L85 PathProgramCache]: Analyzing trace with hash 1097080447, now seen corresponding path program 1 times [2023-08-24 12:44:07,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:44:07,279 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788988468] [2023-08-24 12:44:07,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:44:07,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:44:07,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:44:07,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:44:07,309 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:44:07,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788988468] [2023-08-24 12:44:07,309 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788988468] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:44:07,309 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:44:07,309 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:44:07,310 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597345761] [2023-08-24 12:44:07,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:44:07,310 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:44:07,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:44:07,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:44:07,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:44:07,311 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 126 out of 274 [2023-08-24 12:44:07,311 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 60 places, 78 transitions, 186 flow. Second operand has 3 states, 3 states have (on average 127.66666666666667) internal successors, (383), 3 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:07,311 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:44:07,311 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 126 of 274 [2023-08-24 12:44:07,312 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:44:09,922 INFO L124 PetriNetUnfolderBase]: 21048/31609 cut-off events. [2023-08-24 12:44:09,922 INFO L125 PetriNetUnfolderBase]: For 867/867 co-relation queries the response was YES. [2023-08-24 12:44:09,989 INFO L83 FinitePrefix]: Finished finitePrefix Result has 61868 conditions, 31609 events. 21048/31609 cut-off events. For 867/867 co-relation queries the response was YES. Maximal size of possible extension queue 905. Compared 219315 event pairs, 19361 based on Foata normal form. 5728/33793 useless extension candidates. Maximal degree in co-relation 23156. Up to 29586 conditions per place. [2023-08-24 12:44:10,085 INFO L140 encePairwiseOnDemand]: 250/274 looper letters, 41 selfloop transitions, 2 changer transitions 11/66 dead transitions. [2023-08-24 12:44:10,085 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 61 places, 66 transitions, 266 flow [2023-08-24 12:44:10,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:44:10,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:44:10,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 458 transitions. [2023-08-24 12:44:10,087 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5571776155717761 [2023-08-24 12:44:10,087 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 458 transitions. [2023-08-24 12:44:10,087 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 458 transitions. [2023-08-24 12:44:10,087 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:44:10,087 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 458 transitions. [2023-08-24 12:44:10,089 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 152.66666666666666) internal successors, (458), 3 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:10,090 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 274.0) internal successors, (1096), 4 states have internal predecessors, (1096), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:10,091 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 274.0) internal successors, (1096), 4 states have internal predecessors, (1096), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:10,091 INFO L175 Difference]: Start difference. First operand has 60 places, 78 transitions, 186 flow. Second operand 3 states and 458 transitions. [2023-08-24 12:44:10,091 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 61 places, 66 transitions, 266 flow [2023-08-24 12:44:10,093 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 66 transitions, 266 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-24 12:44:10,094 INFO L231 Difference]: Finished difference. Result has 62 places, 46 transitions, 117 flow [2023-08-24 12:44:10,094 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=274, PETRI_DIFFERENCE_MINUEND_FLOW=142, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=54, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=117, PETRI_PLACES=62, PETRI_TRANSITIONS=46} [2023-08-24 12:44:10,095 INFO L281 CegarLoopForPetriNet]: 60 programPoint places, 2 predicate places. [2023-08-24 12:44:10,095 INFO L495 AbstractCegarLoop]: Abstraction has has 62 places, 46 transitions, 117 flow [2023-08-24 12:44:10,095 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 127.66666666666667) internal successors, (383), 3 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:10,095 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:44:10,095 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:44:10,096 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-24 12:44:10,096 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:44:10,096 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:44:10,096 INFO L85 PathProgramCache]: Analyzing trace with hash -1883546313, now seen corresponding path program 1 times [2023-08-24 12:44:10,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:44:10,096 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [423805681] [2023-08-24 12:44:10,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:44:10,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:44:10,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:44:10,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:44:10,161 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:44:10,162 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [423805681] [2023-08-24 12:44:10,162 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [423805681] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:44:10,162 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926948508] [2023-08-24 12:44:10,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:44:10,162 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:44:10,162 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:44:10,165 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-24 12:44:10,190 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-08-24 12:44:10,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:44:10,240 INFO L262 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-24 12:44:10,241 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:44:10,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:44:10,252 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:44:10,272 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:44:10,272 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926948508] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:44:10,273 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:44:10,273 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-24 12:44:10,273 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140679387] [2023-08-24 12:44:10,273 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:44:10,274 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-24 12:44:10,274 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:44:10,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-24 12:44:10,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-24 12:44:10,275 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 126 out of 274 [2023-08-24 12:44:10,277 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 62 places, 46 transitions, 117 flow. Second operand has 7 states, 7 states have (on average 128.42857142857142) internal successors, (899), 7 states have internal predecessors, (899), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:10,277 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:44:10,277 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 126 of 274 [2023-08-24 12:44:10,277 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:44:10,923 INFO L124 PetriNetUnfolderBase]: 4372/7033 cut-off events. [2023-08-24 12:44:10,923 INFO L125 PetriNetUnfolderBase]: For 1233/1233 co-relation queries the response was YES. [2023-08-24 12:44:10,935 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14405 conditions, 7033 events. 4372/7033 cut-off events. For 1233/1233 co-relation queries the response was YES. Maximal size of possible extension queue 245. Compared 44589 event pairs, 324 based on Foata normal form. 657/7527 useless extension candidates. Maximal degree in co-relation 1643. Up to 4122 conditions per place. [2023-08-24 12:44:10,940 INFO L140 encePairwiseOnDemand]: 271/274 looper letters, 0 selfloop transitions, 0 changer transitions 91/91 dead transitions. [2023-08-24 12:44:10,940 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 91 transitions, 365 flow [2023-08-24 12:44:10,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-24 12:44:10,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-24 12:44:10,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 838 transitions. [2023-08-24 12:44:10,942 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5097323600973236 [2023-08-24 12:44:10,942 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 838 transitions. [2023-08-24 12:44:10,943 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 838 transitions. [2023-08-24 12:44:10,943 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:44:10,943 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 838 transitions. [2023-08-24 12:44:10,945 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 139.66666666666666) internal successors, (838), 6 states have internal predecessors, (838), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:10,947 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 274.0) internal successors, (1918), 7 states have internal predecessors, (1918), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:10,947 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 274.0) internal successors, (1918), 7 states have internal predecessors, (1918), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:10,947 INFO L175 Difference]: Start difference. First operand has 62 places, 46 transitions, 117 flow. Second operand 6 states and 838 transitions. [2023-08-24 12:44:10,948 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 91 transitions, 365 flow [2023-08-24 12:44:10,950 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 91 transitions, 361 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-24 12:44:10,951 INFO L231 Difference]: Finished difference. Result has 54 places, 0 transitions, 0 flow [2023-08-24 12:44:10,951 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=274, PETRI_DIFFERENCE_MINUEND_FLOW=101, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=41, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=54, PETRI_TRANSITIONS=0} [2023-08-24 12:44:10,951 INFO L281 CegarLoopForPetriNet]: 60 programPoint places, -6 predicate places. [2023-08-24 12:44:10,951 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 0 transitions, 0 flow [2023-08-24 12:44:10,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 128.42857142857142) internal successors, (899), 7 states have internal predecessors, (899), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:10,952 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-24 12:44:10,960 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-08-24 12:44:11,157 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:44:11,158 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-24 12:44:11,158 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-24 12:44:11,160 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 144 places, 165 transitions, 360 flow [2023-08-24 12:44:11,184 INFO L124 PetriNetUnfolderBase]: 58/365 cut-off events. [2023-08-24 12:44:11,184 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-24 12:44:11,187 INFO L83 FinitePrefix]: Finished finitePrefix Result has 393 conditions, 365 events. 58/365 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1192 event pairs, 1 based on Foata normal form. 0/299 useless extension candidates. Maximal degree in co-relation 246. Up to 16 conditions per place. [2023-08-24 12:44:11,187 INFO L82 GeneralOperation]: Start removeDead. Operand has 144 places, 165 transitions, 360 flow [2023-08-24 12:44:11,189 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 144 places, 165 transitions, 360 flow [2023-08-24 12:44:11,189 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:44:11,189 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 144 places, 165 transitions, 360 flow [2023-08-24 12:44:11,189 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 144 places, 165 transitions, 360 flow [2023-08-24 12:44:11,189 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 144 places, 165 transitions, 360 flow [2023-08-24 12:44:11,212 INFO L124 PetriNetUnfolderBase]: 58/365 cut-off events. [2023-08-24 12:44:11,212 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-24 12:44:11,215 INFO L83 FinitePrefix]: Finished finitePrefix Result has 393 conditions, 365 events. 58/365 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1192 event pairs, 1 based on Foata normal form. 0/299 useless extension candidates. Maximal degree in co-relation 246. Up to 16 conditions per place. [2023-08-24 12:44:11,223 INFO L119 LiptonReduction]: Number of co-enabled transitions 13440 [2023-08-24 12:44:13,368 INFO L134 LiptonReduction]: Checked pairs total: 37136 [2023-08-24 12:44:13,368 INFO L136 LiptonReduction]: Total number of compositions: 110 [2023-08-24 12:44:13,369 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-24 12:44:13,370 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5223ec75, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:44:13,370 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:44:13,376 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:44:13,376 INFO L124 PetriNetUnfolderBase]: 25/98 cut-off events. [2023-08-24 12:44:13,376 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-24 12:44:13,376 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:44:13,376 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-24 12:44:13,376 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-24 12:44:13,377 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:44:13,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1326920963, now seen corresponding path program 1 times [2023-08-24 12:44:13,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:44:13,377 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301692778] [2023-08-24 12:44:13,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:44:13,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:44:13,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:44:13,405 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-24 12:44:13,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:44:13,427 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-24 12:44:13,427 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-24 12:44:13,427 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-24 12:44:13,427 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-24 12:44:13,428 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-24 12:44:13,429 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-24 12:44:13,429 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-24 12:44:13,429 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-24 12:44:13,455 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-24 12:44:13,457 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 169 places, 195 transitions, 434 flow [2023-08-24 12:44:13,512 INFO L124 PetriNetUnfolderBase]: 91/560 cut-off events. [2023-08-24 12:44:13,512 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-24 12:44:13,518 INFO L83 FinitePrefix]: Finished finitePrefix Result has 615 conditions, 560 events. 91/560 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 2109 event pairs, 6 based on Foata normal form. 0/464 useless extension candidates. Maximal degree in co-relation 385. Up to 32 conditions per place. [2023-08-24 12:44:13,518 INFO L82 GeneralOperation]: Start removeDead. Operand has 169 places, 195 transitions, 434 flow [2023-08-24 12:44:13,521 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 169 places, 195 transitions, 434 flow [2023-08-24 12:44:13,522 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:44:13,522 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 169 places, 195 transitions, 434 flow [2023-08-24 12:44:13,522 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 169 places, 195 transitions, 434 flow [2023-08-24 12:44:13,522 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 169 places, 195 transitions, 434 flow [2023-08-24 12:44:13,571 INFO L124 PetriNetUnfolderBase]: 91/560 cut-off events. [2023-08-24 12:44:13,572 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-24 12:44:13,577 INFO L83 FinitePrefix]: Finished finitePrefix Result has 615 conditions, 560 events. 91/560 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 2109 event pairs, 6 based on Foata normal form. 0/464 useless extension candidates. Maximal degree in co-relation 385. Up to 32 conditions per place. [2023-08-24 12:44:13,590 INFO L119 LiptonReduction]: Number of co-enabled transitions 21392 [2023-08-24 12:44:15,807 INFO L134 LiptonReduction]: Checked pairs total: 58069 [2023-08-24 12:44:15,807 INFO L136 LiptonReduction]: Total number of compositions: 125 [2023-08-24 12:44:15,808 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:44:15,809 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5223ec75, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:44:15,809 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:44:15,810 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:44:15,810 INFO L124 PetriNetUnfolderBase]: 2/16 cut-off events. [2023-08-24 12:44:15,811 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:44:15,811 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:44:15,811 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-24 12:44:15,811 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:44:15,811 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:44:15,811 INFO L85 PathProgramCache]: Analyzing trace with hash 1536029595, now seen corresponding path program 1 times [2023-08-24 12:44:15,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:44:15,811 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086283634] [2023-08-24 12:44:15,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:44:15,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:44:15,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:44:15,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:44:15,829 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:44:15,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086283634] [2023-08-24 12:44:15,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086283634] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:44:15,830 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:44:15,830 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:44:15,830 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617340863] [2023-08-24 12:44:15,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:44:15,830 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:44:15,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:44:15,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:44:15,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:44:15,831 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 148 out of 320 [2023-08-24 12:44:15,832 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 95 transitions, 234 flow. Second operand has 3 states, 3 states have (on average 149.66666666666666) internal successors, (449), 3 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:15,832 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:44:15,832 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 148 of 320 [2023-08-24 12:44:15,832 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:44:42,058 INFO L124 PetriNetUnfolderBase]: 298317/406647 cut-off events. [2023-08-24 12:44:42,059 INFO L125 PetriNetUnfolderBase]: For 14764/14764 co-relation queries the response was YES. [2023-08-24 12:44:42,836 INFO L83 FinitePrefix]: Finished finitePrefix Result has 802310 conditions, 406647 events. 298317/406647 cut-off events. For 14764/14764 co-relation queries the response was YES. Maximal size of possible extension queue 8345. Compared 3052543 event pairs, 214660 based on Foata normal form. 65452/440574 useless extension candidates. Maximal degree in co-relation 69542. Up to 387526 conditions per place. [2023-08-24 12:44:43,815 INFO L140 encePairwiseOnDemand]: 291/320 looper letters, 51 selfloop transitions, 2 changer transitions 12/79 dead transitions. [2023-08-24 12:44:43,815 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 75 places, 79 transitions, 328 flow [2023-08-24 12:44:43,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:44:43,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:44:43,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 540 transitions. [2023-08-24 12:44:43,817 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5625 [2023-08-24 12:44:43,817 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 540 transitions. [2023-08-24 12:44:43,817 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 540 transitions. [2023-08-24 12:44:43,818 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:44:43,818 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 540 transitions. [2023-08-24 12:44:43,819 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 180.0) internal successors, (540), 3 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:43,820 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 320.0) internal successors, (1280), 4 states have internal predecessors, (1280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:43,821 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 320.0) internal successors, (1280), 4 states have internal predecessors, (1280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:43,821 INFO L175 Difference]: Start difference. First operand has 73 places, 95 transitions, 234 flow. Second operand 3 states and 540 transitions. [2023-08-24 12:44:43,821 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 75 places, 79 transitions, 328 flow [2023-08-24 12:44:43,827 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 75 places, 79 transitions, 328 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-24 12:44:43,828 INFO L231 Difference]: Finished difference. Result has 76 places, 58 transitions, 150 flow [2023-08-24 12:44:43,829 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=320, PETRI_DIFFERENCE_MINUEND_FLOW=182, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=69, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=67, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=150, PETRI_PLACES=76, PETRI_TRANSITIONS=58} [2023-08-24 12:44:43,829 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 3 predicate places. [2023-08-24 12:44:43,829 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 58 transitions, 150 flow [2023-08-24 12:44:43,829 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 149.66666666666666) internal successors, (449), 3 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:43,830 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:44:43,830 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:44:43,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-24 12:44:43,830 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:44:43,830 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:44:43,830 INFO L85 PathProgramCache]: Analyzing trace with hash 95391345, now seen corresponding path program 1 times [2023-08-24 12:44:43,830 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:44:43,830 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40642110] [2023-08-24 12:44:43,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:44:43,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:44:43,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:44:43,864 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:44:43,864 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:44:43,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40642110] [2023-08-24 12:44:43,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40642110] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:44:43,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715123210] [2023-08-24 12:44:43,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:44:43,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:44:43,864 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:44:43,865 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-24 12:44:43,868 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-08-24 12:44:43,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:44:43,940 INFO L262 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-24 12:44:43,940 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:44:43,947 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:44:43,947 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:44:43,963 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:44:43,964 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715123210] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:44:43,964 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:44:43,964 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2023-08-24 12:44:43,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802689229] [2023-08-24 12:44:43,964 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:44:43,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-08-24 12:44:43,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:44:43,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-08-24 12:44:43,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2023-08-24 12:44:43,967 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 148 out of 320 [2023-08-24 12:44:43,969 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 58 transitions, 150 flow. Second operand has 6 states, 6 states have (on average 150.16666666666666) internal successors, (901), 6 states have internal predecessors, (901), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:43,969 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:44:43,969 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 148 of 320 [2023-08-24 12:44:43,969 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:44:55,434 INFO L124 PetriNetUnfolderBase]: 150148/201274 cut-off events. [2023-08-24 12:44:55,435 INFO L125 PetriNetUnfolderBase]: For 15210/15210 co-relation queries the response was YES. [2023-08-24 12:44:55,854 INFO L83 FinitePrefix]: Finished finitePrefix Result has 410403 conditions, 201274 events. 150148/201274 cut-off events. For 15210/15210 co-relation queries the response was YES. Maximal size of possible extension queue 4628. Compared 1382210 event pairs, 18792 based on Foata normal form. 729/196170 useless extension candidates. Maximal degree in co-relation 46655. Up to 138268 conditions per place. [2023-08-24 12:44:56,477 INFO L140 encePairwiseOnDemand]: 316/320 looper letters, 121 selfloop transitions, 5 changer transitions 1/141 dead transitions. [2023-08-24 12:44:56,478 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 73 places, 141 transitions, 574 flow [2023-08-24 12:44:56,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-24 12:44:56,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-24 12:44:56,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1018 transitions. [2023-08-24 12:44:56,481 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5302083333333333 [2023-08-24 12:44:56,481 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1018 transitions. [2023-08-24 12:44:56,481 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1018 transitions. [2023-08-24 12:44:56,482 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:44:56,482 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1018 transitions. [2023-08-24 12:44:56,483 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 169.66666666666666) internal successors, (1018), 6 states have internal predecessors, (1018), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:56,485 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 320.0) internal successors, (2240), 7 states have internal predecessors, (2240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:56,486 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 320.0) internal successors, (2240), 7 states have internal predecessors, (2240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:56,486 INFO L175 Difference]: Start difference. First operand has 76 places, 58 transitions, 150 flow. Second operand 6 states and 1018 transitions. [2023-08-24 12:44:56,486 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 73 places, 141 transitions, 574 flow [2023-08-24 12:44:56,490 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 72 places, 141 transitions, 566 flow, removed 3 selfloop flow, removed 1 redundant places. [2023-08-24 12:44:56,492 INFO L231 Difference]: Finished difference. Result has 76 places, 60 transitions, 176 flow [2023-08-24 12:44:56,492 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=320, PETRI_DIFFERENCE_MINUEND_FLOW=142, PETRI_DIFFERENCE_MINUEND_PLACES=67, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=176, PETRI_PLACES=76, PETRI_TRANSITIONS=60} [2023-08-24 12:44:56,493 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 3 predicate places. [2023-08-24 12:44:56,493 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 60 transitions, 176 flow [2023-08-24 12:44:56,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 150.16666666666666) internal successors, (901), 6 states have internal predecessors, (901), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:56,493 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:44:56,493 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:44:56,504 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-08-24 12:44:56,698 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:44:56,698 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:44:56,698 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:44:56,698 INFO L85 PathProgramCache]: Analyzing trace with hash 683785849, now seen corresponding path program 1 times [2023-08-24 12:44:56,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:44:56,699 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575079] [2023-08-24 12:44:56,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:44:56,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:44:56,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:44:56,794 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-08-24 12:44:56,794 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:44:56,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575079] [2023-08-24 12:44:56,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575079] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:44:56,795 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:44:56,795 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-24 12:44:56,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698403643] [2023-08-24 12:44:56,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:44:56,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:44:56,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:44:56,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:44:56,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:44:56,796 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 138 out of 320 [2023-08-24 12:44:56,797 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 60 transitions, 176 flow. Second operand has 3 states, 3 states have (on average 141.66666666666666) internal successors, (425), 3 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:44:56,797 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:44:56,797 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 138 of 320 [2023-08-24 12:44:56,797 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:45:15,441 INFO L124 PetriNetUnfolderBase]: 245410/321286 cut-off events. [2023-08-24 12:45:15,441 INFO L125 PetriNetUnfolderBase]: For 187060/187060 co-relation queries the response was YES. [2023-08-24 12:45:16,369 INFO L83 FinitePrefix]: Finished finitePrefix Result has 721383 conditions, 321286 events. 245410/321286 cut-off events. For 187060/187060 co-relation queries the response was YES. Maximal size of possible extension queue 6190. Compared 2090069 event pairs, 109504 based on Foata normal form. 192/310330 useless extension candidates. Maximal degree in co-relation 574693. Up to 310023 conditions per place. [2023-08-24 12:45:17,323 INFO L140 encePairwiseOnDemand]: 314/320 looper letters, 74 selfloop transitions, 5 changer transitions 0/87 dead transitions. [2023-08-24 12:45:17,323 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 87 transitions, 436 flow [2023-08-24 12:45:17,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:45:17,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:45:17,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 488 transitions. [2023-08-24 12:45:17,325 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5083333333333333 [2023-08-24 12:45:17,325 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 488 transitions. [2023-08-24 12:45:17,325 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 488 transitions. [2023-08-24 12:45:17,326 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:45:17,326 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 488 transitions. [2023-08-24 12:45:17,327 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 162.66666666666666) internal successors, (488), 3 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:45:17,328 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 320.0) internal successors, (1280), 4 states have internal predecessors, (1280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:45:17,329 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 320.0) internal successors, (1280), 4 states have internal predecessors, (1280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:45:17,329 INFO L175 Difference]: Start difference. First operand has 76 places, 60 transitions, 176 flow. Second operand 3 states and 488 transitions. [2023-08-24 12:45:17,329 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 87 transitions, 436 flow [2023-08-24 12:45:17,426 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 75 places, 87 transitions, 416 flow, removed 6 selfloop flow, removed 3 redundant places. [2023-08-24 12:45:17,427 INFO L231 Difference]: Finished difference. Result has 76 places, 64 transitions, 198 flow [2023-08-24 12:45:17,427 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=320, PETRI_DIFFERENCE_MINUEND_FLOW=165, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=60, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=198, PETRI_PLACES=76, PETRI_TRANSITIONS=64} [2023-08-24 12:45:17,428 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 3 predicate places. [2023-08-24 12:45:17,428 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 64 transitions, 198 flow [2023-08-24 12:45:17,428 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 141.66666666666666) internal successors, (425), 3 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:45:17,428 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:45:17,428 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:45:17,428 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-24 12:45:17,429 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:45:17,429 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:45:17,429 INFO L85 PathProgramCache]: Analyzing trace with hash -2069079877, now seen corresponding path program 1 times [2023-08-24 12:45:17,429 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:45:17,429 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957188142] [2023-08-24 12:45:17,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:45:17,429 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:45:17,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:45:17,507 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:45:17,507 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:45:17,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957188142] [2023-08-24 12:45:17,507 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1957188142] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:45:17,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [336353137] [2023-08-24 12:45:17,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:45:17,508 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:45:17,508 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:45:17,509 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-24 12:45:17,513 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-08-24 12:45:17,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:45:17,599 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-24 12:45:17,600 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:45:17,626 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:45:17,626 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:45:17,682 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:45:17,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [336353137] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:45:17,683 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:45:17,683 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-08-24 12:45:17,683 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652862444] [2023-08-24 12:45:17,683 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:45:17,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-08-24 12:45:17,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:45:17,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-08-24 12:45:17,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2023-08-24 12:45:17,685 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 148 out of 320 [2023-08-24 12:45:17,686 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 64 transitions, 198 flow. Second operand has 12 states, 12 states have (on average 151.0) internal successors, (1812), 12 states have internal predecessors, (1812), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:45:17,686 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:45:17,686 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 148 of 320 [2023-08-24 12:45:17,686 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:45:21,877 INFO L124 PetriNetUnfolderBase]: 45600/64888 cut-off events. [2023-08-24 12:45:21,877 INFO L125 PetriNetUnfolderBase]: For 78396/78396 co-relation queries the response was YES. [2023-08-24 12:45:22,085 INFO L83 FinitePrefix]: Finished finitePrefix Result has 142640 conditions, 64888 events. 45600/64888 cut-off events. For 78396/78396 co-relation queries the response was YES. Maximal size of possible extension queue 1671. Compared 451826 event pairs, 558 based on Foata normal form. 6480/71029 useless extension candidates. Maximal degree in co-relation 89888. Up to 29418 conditions per place. [2023-08-24 12:45:22,118 INFO L140 encePairwiseOnDemand]: 317/320 looper letters, 0 selfloop transitions, 0 changer transitions 145/145 dead transitions. [2023-08-24 12:45:22,118 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 145 transitions, 649 flow [2023-08-24 12:45:22,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-24 12:45:22,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-24 12:45:22,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1158 transitions. [2023-08-24 12:45:22,121 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5169642857142858 [2023-08-24 12:45:22,121 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1158 transitions. [2023-08-24 12:45:22,121 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1158 transitions. [2023-08-24 12:45:22,122 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:45:22,122 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1158 transitions. [2023-08-24 12:45:22,123 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 165.42857142857142) internal successors, (1158), 7 states have internal predecessors, (1158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:45:22,126 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 320.0) internal successors, (2560), 8 states have internal predecessors, (2560), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:45:22,126 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 320.0) internal successors, (2560), 8 states have internal predecessors, (2560), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:45:22,127 INFO L175 Difference]: Start difference. First operand has 76 places, 64 transitions, 198 flow. Second operand 7 states and 1158 transitions. [2023-08-24 12:45:22,127 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 145 transitions, 649 flow [2023-08-24 12:45:22,140 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 145 transitions, 629 flow, removed 0 selfloop flow, removed 5 redundant places. [2023-08-24 12:45:22,141 INFO L231 Difference]: Finished difference. Result has 73 places, 0 transitions, 0 flow [2023-08-24 12:45:22,141 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=320, PETRI_DIFFERENCE_MINUEND_FLOW=165, PETRI_DIFFERENCE_MINUEND_PLACES=67, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=59, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=0, PETRI_PLACES=73, PETRI_TRANSITIONS=0} [2023-08-24 12:45:22,141 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 0 predicate places. [2023-08-24 12:45:22,141 INFO L495 AbstractCegarLoop]: Abstraction has has 73 places, 0 transitions, 0 flow [2023-08-24 12:45:22,142 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 151.0) internal successors, (1812), 12 states have internal predecessors, (1812), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:45:22,142 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-24 12:45:22,147 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-08-24 12:45:22,344 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-08-24 12:45:22,344 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-24 12:45:22,345 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-24 12:45:22,347 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 169 places, 195 transitions, 434 flow [2023-08-24 12:45:22,386 INFO L124 PetriNetUnfolderBase]: 91/560 cut-off events. [2023-08-24 12:45:22,387 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-24 12:45:22,390 INFO L83 FinitePrefix]: Finished finitePrefix Result has 615 conditions, 560 events. 91/560 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 2109 event pairs, 6 based on Foata normal form. 0/464 useless extension candidates. Maximal degree in co-relation 385. Up to 32 conditions per place. [2023-08-24 12:45:22,390 INFO L82 GeneralOperation]: Start removeDead. Operand has 169 places, 195 transitions, 434 flow [2023-08-24 12:45:22,392 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 169 places, 195 transitions, 434 flow [2023-08-24 12:45:22,392 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:45:22,392 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 169 places, 195 transitions, 434 flow [2023-08-24 12:45:22,393 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 169 places, 195 transitions, 434 flow [2023-08-24 12:45:22,393 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 169 places, 195 transitions, 434 flow [2023-08-24 12:45:22,432 INFO L124 PetriNetUnfolderBase]: 91/560 cut-off events. [2023-08-24 12:45:22,432 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-24 12:45:22,438 INFO L83 FinitePrefix]: Finished finitePrefix Result has 615 conditions, 560 events. 91/560 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 2109 event pairs, 6 based on Foata normal form. 0/464 useless extension candidates. Maximal degree in co-relation 385. Up to 32 conditions per place. [2023-08-24 12:45:22,451 INFO L119 LiptonReduction]: Number of co-enabled transitions 21392 [2023-08-24 12:45:24,476 INFO L134 LiptonReduction]: Checked pairs total: 57950 [2023-08-24 12:45:24,476 INFO L136 LiptonReduction]: Total number of compositions: 125 [2023-08-24 12:45:24,477 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-24 12:45:24,478 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5223ec75, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:45:24,479 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:45:24,487 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:45:24,487 INFO L124 PetriNetUnfolderBase]: 36/141 cut-off events. [2023-08-24 12:45:24,487 INFO L125 PetriNetUnfolderBase]: For 23/23 co-relation queries the response was YES. [2023-08-24 12:45:24,487 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:45:24,487 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-24 12:45:24,488 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-24 12:45:24,488 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:45:24,488 INFO L85 PathProgramCache]: Analyzing trace with hash 81672303, now seen corresponding path program 1 times [2023-08-24 12:45:24,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:45:24,488 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657757119] [2023-08-24 12:45:24,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:45:24,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:45:24,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:45:24,512 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-24 12:45:24,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:45:24,523 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-24 12:45:24,524 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-24 12:45:24,524 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-24 12:45:24,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-24 12:45:24,524 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-24 12:45:24,525 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-24 12:45:24,525 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-24 12:45:24,525 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-24 12:45:24,544 INFO L144 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2023-08-24 12:45:24,546 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 194 places, 225 transitions, 510 flow [2023-08-24 12:45:24,639 INFO L124 PetriNetUnfolderBase]: 152/895 cut-off events. [2023-08-24 12:45:24,639 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-24 12:45:24,649 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1006 conditions, 895 events. 152/895 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 4014 event pairs, 23 based on Foata normal form. 0/753 useless extension candidates. Maximal degree in co-relation 605. Up to 80 conditions per place. [2023-08-24 12:45:24,649 INFO L82 GeneralOperation]: Start removeDead. Operand has 194 places, 225 transitions, 510 flow [2023-08-24 12:45:24,653 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 194 places, 225 transitions, 510 flow [2023-08-24 12:45:24,653 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:45:24,653 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 194 places, 225 transitions, 510 flow [2023-08-24 12:45:24,653 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 194 places, 225 transitions, 510 flow [2023-08-24 12:45:24,653 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 194 places, 225 transitions, 510 flow [2023-08-24 12:45:24,718 INFO L124 PetriNetUnfolderBase]: 152/895 cut-off events. [2023-08-24 12:45:24,719 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-24 12:45:24,727 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1006 conditions, 895 events. 152/895 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 4014 event pairs, 23 based on Foata normal form. 0/753 useless extension candidates. Maximal degree in co-relation 605. Up to 80 conditions per place. [2023-08-24 12:45:24,753 INFO L119 LiptonReduction]: Number of co-enabled transitions 31080 [2023-08-24 12:45:27,058 INFO L134 LiptonReduction]: Checked pairs total: 75525 [2023-08-24 12:45:27,058 INFO L136 LiptonReduction]: Total number of compositions: 140 [2023-08-24 12:45:27,059 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:45:27,060 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5223ec75, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:45:27,060 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:45:27,061 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:45:27,061 INFO L124 PetriNetUnfolderBase]: 2/15 cut-off events. [2023-08-24 12:45:27,061 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:45:27,061 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:45:27,061 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-24 12:45:27,061 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:45:27,062 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:45:27,062 INFO L85 PathProgramCache]: Analyzing trace with hash 2031880448, now seen corresponding path program 1 times [2023-08-24 12:45:27,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:45:27,062 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301235537] [2023-08-24 12:45:27,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:45:27,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:45:27,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:45:27,079 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:45:27,079 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:45:27,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301235537] [2023-08-24 12:45:27,079 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301235537] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:45:27,079 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:45:27,079 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:45:27,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113702321] [2023-08-24 12:45:27,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:45:27,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:45:27,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:45:27,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:45:27,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:45:27,081 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 170 out of 365 [2023-08-24 12:45:27,081 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 87 places, 114 transitions, 288 flow. Second operand has 3 states, 3 states have (on average 171.66666666666666) internal successors, (515), 3 states have internal predecessors, (515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:45:27,081 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:45:27,081 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 170 of 365 [2023-08-24 12:45:27,081 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand