/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 --cacsl2boogietranslator.check.unreachability.of.reach_error.function false --cacsl2boogietranslator.check.absence.of.signed.integer.overflows true -i ../../../trunk/examples/svcomp/pthread-ext/29_conditionals_vs.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-27 09:46:42,517 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-27 09:46:42,585 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 [2023-08-27 09:46:42,589 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-27 09:46:42,590 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-27 09:46:42,623 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-27 09:46:42,624 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-27 09:46:42,624 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-27 09:46:42,625 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-27 09:46:42,628 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-27 09:46:42,628 INFO L153 SettingsManager]: * Use SBE=true [2023-08-27 09:46:42,629 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-27 09:46:42,629 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-27 09:46:42,630 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-27 09:46:42,630 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-27 09:46:42,630 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-27 09:46:42,630 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-27 09:46:42,631 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-27 09:46:42,631 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-27 09:46:42,631 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-27 09:46:42,631 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-27 09:46:42,631 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-27 09:46:42,631 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-27 09:46:42,632 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-27 09:46:42,632 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-27 09:46:42,632 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-27 09:46:42,633 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-27 09:46:42,633 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-27 09:46:42,633 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-27 09:46:42,633 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-27 09:46:42,634 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-27 09:46:42,634 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-27 09:46:42,634 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-27 09:46:42,634 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-27 09:46:42,635 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-27 09:46:42,635 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check absence of signed integer overflows -> true [2023-08-27 09:46:42,914 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-27 09:46:42,929 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-27 09:46:42,930 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-27 09:46:42,931 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-27 09:46:42,932 INFO L274 PluginConnector]: CDTParser initialized [2023-08-27 09:46:42,933 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread-ext/29_conditionals_vs.i [2023-08-27 09:46:43,989 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-27 09:46:44,224 INFO L384 CDTParser]: Found 1 translation units. [2023-08-27 09:46:44,224 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread-ext/29_conditionals_vs.i [2023-08-27 09:46:44,236 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed5f0fa9f/df6eee72337a4ad9b49871056ac7f232/FLAG3fecc6de2 [2023-08-27 09:46:44,249 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed5f0fa9f/df6eee72337a4ad9b49871056ac7f232 [2023-08-27 09:46:44,253 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-27 09:46:44,255 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-27 09:46:44,258 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-27 09:46:44,258 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-27 09:46:44,260 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-27 09:46:44,261 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,262 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2df7d311 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44, skipping insertion in model container [2023-08-27 09:46:44,262 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,305 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-27 09:46:44,568 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-27 09:46:44,579 INFO L201 MainTranslator]: Completed pre-run [2023-08-27 09:46:44,607 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [254] [2023-08-27 09:46:44,608 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [254] [2023-08-27 09:46:44,624 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-27 09:46:44,653 INFO L206 MainTranslator]: Completed translation [2023-08-27 09:46:44,653 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44 WrapperNode [2023-08-27 09:46:44,653 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-27 09:46:44,654 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-27 09:46:44,655 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-27 09:46:44,655 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-27 09:46:44,660 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,688 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,704 INFO L138 Inliner]: procedures = 170, calls = 15, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 64 [2023-08-27 09:46:44,704 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-27 09:46:44,704 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-27 09:46:44,705 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-27 09:46:44,705 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-27 09:46:44,710 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,711 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,712 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,712 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,725 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,727 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,729 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,730 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,732 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-27 09:46:44,732 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-27 09:46:44,732 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-27 09:46:44,732 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-27 09:46:44,733 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44" (1/1) ... [2023-08-27 09:46:44,737 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-27 09:46:44,747 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-27 09:46:44,782 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) [2023-08-27 09:46:44,788 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 [2023-08-27 09:46:44,806 INFO L130 BoogieDeclarations]: Found specification of procedure thr1 [2023-08-27 09:46:44,806 INFO L138 BoogieDeclarations]: Found implementation of procedure thr1 [2023-08-27 09:46:44,806 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-27 09:46:44,806 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-27 09:46:44,806 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-27 09:46:44,807 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-27 09:46:44,807 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-27 09:46:44,807 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-27 09:46:44,807 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-27 09:46:44,808 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-27 09:46:44,894 INFO L236 CfgBuilder]: Building ICFG [2023-08-27 09:46:44,896 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-27 09:46:44,998 INFO L277 CfgBuilder]: Performing block encoding [2023-08-27 09:46:45,021 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-27 09:46:45,022 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-08-27 09:46:45,023 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 09:46:45 BoogieIcfgContainer [2023-08-27 09:46:45,023 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-27 09:46:45,025 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-27 09:46:45,025 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-27 09:46:45,027 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-27 09:46:45,028 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.08 09:46:44" (1/3) ... [2023-08-27 09:46:45,028 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4655b261 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 09:46:45, skipping insertion in model container [2023-08-27 09:46:45,028 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:46:44" (2/3) ... [2023-08-27 09:46:45,029 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4655b261 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 09:46:45, skipping insertion in model container [2023-08-27 09:46:45,029 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 09:46:45" (3/3) ... [2023-08-27 09:46:45,030 INFO L112 eAbstractionObserver]: Analyzing ICFG 29_conditionals_vs.i [2023-08-27 09:46:45,043 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-27 09:46:45,044 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-08-27 09:46:45,044 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-27 09:46:45,095 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-27 09:46:45,119 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 55 places, 58 transitions, 121 flow [2023-08-27 09:46:45,146 INFO L124 PetriNetUnfolderBase]: 7/68 cut-off events. [2023-08-27 09:46:45,146 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:46:45,158 INFO L83 FinitePrefix]: Finished finitePrefix Result has 73 conditions, 68 events. 7/68 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 68 event pairs, 0 based on Foata normal form. 0/58 useless extension candidates. Maximal degree in co-relation 45. Up to 4 conditions per place. [2023-08-27 09:46:45,158 INFO L82 GeneralOperation]: Start removeDead. Operand has 55 places, 58 transitions, 121 flow [2023-08-27 09:46:45,161 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 55 places, 58 transitions, 121 flow [2023-08-27 09:46:45,163 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:46:45,169 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 55 places, 58 transitions, 121 flow [2023-08-27 09:46:45,171 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 55 places, 58 transitions, 121 flow [2023-08-27 09:46:45,172 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 55 places, 58 transitions, 121 flow [2023-08-27 09:46:45,185 INFO L124 PetriNetUnfolderBase]: 7/68 cut-off events. [2023-08-27 09:46:45,185 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:46:45,185 INFO L83 FinitePrefix]: Finished finitePrefix Result has 73 conditions, 68 events. 7/68 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 68 event pairs, 0 based on Foata normal form. 0/58 useless extension candidates. Maximal degree in co-relation 45. Up to 4 conditions per place. [2023-08-27 09:46:45,186 INFO L119 LiptonReduction]: Number of co-enabled transitions 858 [2023-08-27 09:46:46,897 INFO L134 LiptonReduction]: Checked pairs total: 757 [2023-08-27 09:46:46,898 INFO L136 LiptonReduction]: Total number of compositions: 65 [2023-08-27 09:46:46,910 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-27 09:46:46,921 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:46:46,921 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-08-27 09:46:46,923 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:46:46,923 INFO L124 PetriNetUnfolderBase]: 0/5 cut-off events. [2023-08-27 09:46:46,923 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:46:46,923 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:46:46,924 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-27 09:46:46,924 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT] === [2023-08-27 09:46:46,928 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:46:46,929 INFO L85 PathProgramCache]: Analyzing trace with hash 9341167, now seen corresponding path program 1 times [2023-08-27 09:46:46,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:46:46,936 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745423562] [2023-08-27 09:46:46,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:46:46,936 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:46:47,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-27 09:46:47,052 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-27 09:46:47,053 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-27 09:46:47,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745423562] [2023-08-27 09:46:47,053 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745423562] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-27 09:46:47,053 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-27 09:46:47,054 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-27 09:46:47,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844455098] [2023-08-27 09:46:47,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-27 09:46:47,061 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-27 09:46:47,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-27 09:46:47,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-27 09:46:47,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-27 09:46:47,081 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 50 out of 123 [2023-08-27 09:46:47,082 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 11 places, 8 transitions, 21 flow. Second operand has 2 states, 2 states have (on average 52.0) internal successors, (104), 2 states have internal predecessors, (104), 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) [2023-08-27 09:46:47,083 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-27 09:46:47,083 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 50 of 123 [2023-08-27 09:46:47,083 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-27 09:46:47,096 INFO L124 PetriNetUnfolderBase]: 2/11 cut-off events. [2023-08-27 09:46:47,096 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:46:47,096 INFO L83 FinitePrefix]: Finished finitePrefix Result has 27 conditions, 11 events. 2/11 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 9 event pairs, 2 based on Foata normal form. 0/11 useless extension candidates. Maximal degree in co-relation 14. Up to 11 conditions per place. [2023-08-27 09:46:47,097 INFO L140 encePairwiseOnDemand]: 121/123 looper letters, 0 selfloop transitions, 0 changer transitions 6/6 dead transitions. [2023-08-27 09:46:47,097 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 10 places, 6 transitions, 27 flow [2023-08-27 09:46:47,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-27 09:46:47,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-27 09:46:47,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 107 transitions. [2023-08-27 09:46:47,106 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4349593495934959 [2023-08-27 09:46:47,107 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 107 transitions. [2023-08-27 09:46:47,107 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 107 transitions. [2023-08-27 09:46:47,108 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-27 09:46:47,109 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 107 transitions. [2023-08-27 09:46:47,111 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 53.5) internal successors, (107), 2 states have internal predecessors, (107), 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) [2023-08-27 09:46:47,115 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 123.0) internal successors, (369), 3 states have internal predecessors, (369), 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) [2023-08-27 09:46:47,116 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 123.0) internal successors, (369), 3 states have internal predecessors, (369), 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) [2023-08-27 09:46:47,117 INFO L175 Difference]: Start difference. First operand has 11 places, 8 transitions, 21 flow. Second operand 2 states and 107 transitions. [2023-08-27 09:46:47,118 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 10 places, 6 transitions, 27 flow [2023-08-27 09:46:47,119 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 10 places, 6 transitions, 27 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-27 09:46:47,119 INFO L231 Difference]: Finished difference. Result has 10 places, 0 transitions, 0 flow [2023-08-27 09:46:47,120 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=123, PETRI_DIFFERENCE_MINUEND_FLOW=17, PETRI_DIFFERENCE_MINUEND_PLACES=9, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=6, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=6, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=0, PETRI_PLACES=10, PETRI_TRANSITIONS=0} [2023-08-27 09:46:47,123 INFO L281 CegarLoopForPetriNet]: 11 programPoint places, -1 predicate places. [2023-08-27 09:46:47,123 INFO L495 AbstractCegarLoop]: Abstraction has has 10 places, 0 transitions, 0 flow [2023-08-27 09:46:47,123 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 52.0) internal successors, (104), 2 states have internal predecessors, (104), 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) [2023-08-27 09:46:47,127 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 2 remaining) [2023-08-27 09:46:47,127 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 2 remaining) [2023-08-27 09:46:47,127 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-27 09:46:47,127 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:46:47,130 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE (1/2) [2023-08-27 09:46:47,136 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 55 places, 58 transitions, 121 flow [2023-08-27 09:46:47,151 INFO L124 PetriNetUnfolderBase]: 7/68 cut-off events. [2023-08-27 09:46:47,151 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:46:47,152 INFO L83 FinitePrefix]: Finished finitePrefix Result has 73 conditions, 68 events. 7/68 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 68 event pairs, 0 based on Foata normal form. 0/58 useless extension candidates. Maximal degree in co-relation 45. Up to 4 conditions per place. [2023-08-27 09:46:47,152 INFO L82 GeneralOperation]: Start removeDead. Operand has 55 places, 58 transitions, 121 flow [2023-08-27 09:46:47,153 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 55 places, 58 transitions, 121 flow [2023-08-27 09:46:47,153 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:46:47,153 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 55 places, 58 transitions, 121 flow [2023-08-27 09:46:47,153 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 55 places, 58 transitions, 121 flow [2023-08-27 09:46:47,153 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 55 places, 58 transitions, 121 flow [2023-08-27 09:46:47,175 INFO L124 PetriNetUnfolderBase]: 7/68 cut-off events. [2023-08-27 09:46:47,175 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:46:47,176 INFO L83 FinitePrefix]: Finished finitePrefix Result has 73 conditions, 68 events. 7/68 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 68 event pairs, 0 based on Foata normal form. 0/58 useless extension candidates. Maximal degree in co-relation 45. Up to 4 conditions per place. [2023-08-27 09:46:47,177 INFO L119 LiptonReduction]: Number of co-enabled transitions 858 [2023-08-27 09:46:48,637 INFO L134 LiptonReduction]: Checked pairs total: 757 [2023-08-27 09:46:48,637 INFO L136 LiptonReduction]: Total number of compositions: 65 [2023-08-27 09:46:48,639 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-27 09:46:48,639 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:46:48,640 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-27 09:46:48,641 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:46:48,641 INFO L124 PetriNetUnfolderBase]: 0/9 cut-off events. [2023-08-27 09:46:48,641 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:46:48,641 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:46:48,642 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-27 09:46:48,642 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-27 09:46:48,642 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:46:48,642 INFO L85 PathProgramCache]: Analyzing trace with hash -1958458122, now seen corresponding path program 1 times [2023-08-27 09:46:48,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:46:48,642 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122193305] [2023-08-27 09:46:48,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:46:48,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:46:48,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:46:48,657 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-27 09:46:48,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:46:48,685 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-27 09:46:48,685 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-27 09:46:48,685 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-27 09:46:48,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-27 09:46:48,686 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:46:48,686 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-27 09:46:48,686 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-27 09:46:48,687 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-27 09:46:48,713 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-27 09:46:48,738 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 86 places, 92 transitions, 196 flow [2023-08-27 09:46:48,746 INFO L124 PetriNetUnfolderBase]: 13/114 cut-off events. [2023-08-27 09:46:48,746 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-27 09:46:48,747 INFO L83 FinitePrefix]: Finished finitePrefix Result has 124 conditions, 114 events. 13/114 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 193 event pairs, 0 based on Foata normal form. 0/96 useless extension candidates. Maximal degree in co-relation 78. Up to 6 conditions per place. [2023-08-27 09:46:48,747 INFO L82 GeneralOperation]: Start removeDead. Operand has 86 places, 92 transitions, 196 flow [2023-08-27 09:46:48,747 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 86 places, 92 transitions, 196 flow [2023-08-27 09:46:48,747 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:46:48,748 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 86 places, 92 transitions, 196 flow [2023-08-27 09:46:48,748 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 86 places, 92 transitions, 196 flow [2023-08-27 09:46:48,748 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 86 places, 92 transitions, 196 flow [2023-08-27 09:46:48,754 INFO L124 PetriNetUnfolderBase]: 13/114 cut-off events. [2023-08-27 09:46:48,754 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-27 09:46:48,755 INFO L83 FinitePrefix]: Finished finitePrefix Result has 124 conditions, 114 events. 13/114 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 193 event pairs, 0 based on Foata normal form. 0/96 useless extension candidates. Maximal degree in co-relation 78. Up to 6 conditions per place. [2023-08-27 09:46:48,757 INFO L119 LiptonReduction]: Number of co-enabled transitions 3960 [2023-08-27 09:46:50,411 INFO L134 LiptonReduction]: Checked pairs total: 3821 [2023-08-27 09:46:50,411 INFO L136 LiptonReduction]: Total number of compositions: 104 [2023-08-27 09:46:50,412 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-27 09:46:50,413 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:46:50,413 INFO L358 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2023-08-27 09:46:50,414 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:46:50,414 INFO L124 PetriNetUnfolderBase]: 1/8 cut-off events. [2023-08-27 09:46:50,414 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:46:50,414 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:46:50,414 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-27 09:46:50,415 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT] === [2023-08-27 09:46:50,415 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:46:50,415 INFO L85 PathProgramCache]: Analyzing trace with hash 18228044, now seen corresponding path program 1 times [2023-08-27 09:46:50,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:46:50,415 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764472086] [2023-08-27 09:46:50,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:46:50,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:46:50,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-27 09:46:50,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-27 09:46:50,450 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-27 09:46:50,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764472086] [2023-08-27 09:46:50,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764472086] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-27 09:46:50,451 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-27 09:46:50,451 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-27 09:46:50,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492591469] [2023-08-27 09:46:50,451 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-27 09:46:50,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-27 09:46:50,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-27 09:46:50,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-27 09:46:50,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-27 09:46:50,452 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 78 out of 196 [2023-08-27 09:46:50,452 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 20 places, 16 transitions, 44 flow. Second operand has 2 states, 2 states have (on average 80.0) internal successors, (160), 2 states have internal predecessors, (160), 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) [2023-08-27 09:46:50,452 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-27 09:46:50,452 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 78 of 196 [2023-08-27 09:46:50,452 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-27 09:46:50,473 INFO L124 PetriNetUnfolderBase]: 20/57 cut-off events. [2023-08-27 09:46:50,474 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-27 09:46:50,474 INFO L83 FinitePrefix]: Finished finitePrefix Result has 124 conditions, 57 events. 20/57 cut-off events. For 10/10 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 157 event pairs, 20 based on Foata normal form. 0/52 useless extension candidates. Maximal degree in co-relation 28. Up to 47 conditions per place. [2023-08-27 09:46:50,474 INFO L140 encePairwiseOnDemand]: 192/196 looper letters, 0 selfloop transitions, 0 changer transitions 11/11 dead transitions. [2023-08-27 09:46:50,474 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 17 places, 11 transitions, 50 flow [2023-08-27 09:46:50,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-27 09:46:50,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-27 09:46:50,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 168 transitions. [2023-08-27 09:46:50,479 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42857142857142855 [2023-08-27 09:46:50,479 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 168 transitions. [2023-08-27 09:46:50,479 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 168 transitions. [2023-08-27 09:46:50,481 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-27 09:46:50,481 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 168 transitions. [2023-08-27 09:46:50,482 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 84.0) internal successors, (168), 2 states have internal predecessors, (168), 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) [2023-08-27 09:46:50,483 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 196.0) internal successors, (588), 3 states have internal predecessors, (588), 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) [2023-08-27 09:46:50,484 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 196.0) internal successors, (588), 3 states have internal predecessors, (588), 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) [2023-08-27 09:46:50,484 INFO L175 Difference]: Start difference. First operand has 20 places, 16 transitions, 44 flow. Second operand 2 states and 168 transitions. [2023-08-27 09:46:50,484 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 17 places, 11 transitions, 50 flow [2023-08-27 09:46:50,484 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 17 places, 11 transitions, 48 flow, removed 1 selfloop flow, removed 0 redundant places. [2023-08-27 09:46:50,484 INFO L231 Difference]: Finished difference. Result has 17 places, 0 transitions, 0 flow [2023-08-27 09:46:50,485 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=196, PETRI_DIFFERENCE_MINUEND_FLOW=32, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=11, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=11, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=0, PETRI_PLACES=17, PETRI_TRANSITIONS=0} [2023-08-27 09:46:50,486 INFO L281 CegarLoopForPetriNet]: 20 programPoint places, -3 predicate places. [2023-08-27 09:46:50,486 INFO L495 AbstractCegarLoop]: Abstraction has has 17 places, 0 transitions, 0 flow [2023-08-27 09:46:50,486 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 80.0) internal successors, (160), 2 states have internal predecessors, (160), 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) [2023-08-27 09:46:50,486 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 3 remaining) [2023-08-27 09:46:50,486 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 3 remaining) [2023-08-27 09:46:50,486 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 3 remaining) [2023-08-27 09:46:50,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-08-27 09:46:50,487 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:46:50,487 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE (1/2) [2023-08-27 09:46:50,492 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 86 places, 92 transitions, 196 flow [2023-08-27 09:46:50,501 INFO L124 PetriNetUnfolderBase]: 13/114 cut-off events. [2023-08-27 09:46:50,501 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-27 09:46:50,503 INFO L83 FinitePrefix]: Finished finitePrefix Result has 124 conditions, 114 events. 13/114 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 193 event pairs, 0 based on Foata normal form. 0/96 useless extension candidates. Maximal degree in co-relation 78. Up to 6 conditions per place. [2023-08-27 09:46:50,503 INFO L82 GeneralOperation]: Start removeDead. Operand has 86 places, 92 transitions, 196 flow [2023-08-27 09:46:50,504 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 86 places, 92 transitions, 196 flow [2023-08-27 09:46:50,504 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:46:50,504 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 86 places, 92 transitions, 196 flow [2023-08-27 09:46:50,504 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 86 places, 92 transitions, 196 flow [2023-08-27 09:46:50,504 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 86 places, 92 transitions, 196 flow [2023-08-27 09:46:50,516 INFO L124 PetriNetUnfolderBase]: 13/114 cut-off events. [2023-08-27 09:46:50,516 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-27 09:46:50,516 INFO L83 FinitePrefix]: Finished finitePrefix Result has 124 conditions, 114 events. 13/114 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 193 event pairs, 0 based on Foata normal form. 0/96 useless extension candidates. Maximal degree in co-relation 78. Up to 6 conditions per place. [2023-08-27 09:46:50,518 INFO L119 LiptonReduction]: Number of co-enabled transitions 3960 [2023-08-27 09:46:52,168 INFO L134 LiptonReduction]: Checked pairs total: 3843 [2023-08-27 09:46:52,169 INFO L136 LiptonReduction]: Total number of compositions: 104 [2023-08-27 09:46:52,170 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-27 09:46:52,172 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:46:52,172 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-27 09:46:52,173 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:46:52,173 INFO L124 PetriNetUnfolderBase]: 1/21 cut-off events. [2023-08-27 09:46:52,174 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-27 09:46:52,174 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:46:52,174 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-27 09:46:52,174 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-27 09:46:52,174 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:46:52,174 INFO L85 PathProgramCache]: Analyzing trace with hash -360926679, now seen corresponding path program 1 times [2023-08-27 09:46:52,174 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:46:52,174 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207609459] [2023-08-27 09:46:52,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:46:52,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:46:52,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:46:52,185 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-27 09:46:52,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:46:52,193 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-27 09:46:52,193 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-27 09:46:52,193 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-27 09:46:52,194 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-27 09:46:52,194 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:46:52,194 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-27 09:46:52,194 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-27 09:46:52,194 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-27 09:46:52,206 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-27 09:46:52,207 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 117 places, 126 transitions, 273 flow [2023-08-27 09:46:52,215 INFO L124 PetriNetUnfolderBase]: 19/160 cut-off events. [2023-08-27 09:46:52,215 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-27 09:46:52,216 INFO L83 FinitePrefix]: Finished finitePrefix Result has 176 conditions, 160 events. 19/160 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 376 event pairs, 0 based on Foata normal form. 0/134 useless extension candidates. Maximal degree in co-relation 118. Up to 8 conditions per place. [2023-08-27 09:46:52,216 INFO L82 GeneralOperation]: Start removeDead. Operand has 117 places, 126 transitions, 273 flow [2023-08-27 09:46:52,217 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 117 places, 126 transitions, 273 flow [2023-08-27 09:46:52,217 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:46:52,217 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 117 places, 126 transitions, 273 flow [2023-08-27 09:46:52,217 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 117 places, 126 transitions, 273 flow [2023-08-27 09:46:52,217 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 117 places, 126 transitions, 273 flow [2023-08-27 09:46:52,225 INFO L124 PetriNetUnfolderBase]: 19/160 cut-off events. [2023-08-27 09:46:52,225 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-27 09:46:52,226 INFO L83 FinitePrefix]: Finished finitePrefix Result has 176 conditions, 160 events. 19/160 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 376 event pairs, 0 based on Foata normal form. 0/134 useless extension candidates. Maximal degree in co-relation 118. Up to 8 conditions per place. [2023-08-27 09:46:52,229 INFO L119 LiptonReduction]: Number of co-enabled transitions 9306 [2023-08-27 09:46:54,780 INFO L134 LiptonReduction]: Checked pairs total: 9806 [2023-08-27 09:46:54,780 INFO L136 LiptonReduction]: Total number of compositions: 152 [2023-08-27 09:46:54,789 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-27 09:46:54,797 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:46:54,797 INFO L358 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2023-08-27 09:46:54,798 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:46:54,798 INFO L124 PetriNetUnfolderBase]: 0/5 cut-off events. [2023-08-27 09:46:54,798 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:46:54,798 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:46:54,798 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-27 09:46:54,798 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT] === [2023-08-27 09:46:54,799 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:46:54,799 INFO L85 PathProgramCache]: Analyzing trace with hash 30740526, now seen corresponding path program 1 times [2023-08-27 09:46:54,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:46:54,799 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379299830] [2023-08-27 09:46:54,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:46:54,799 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:46:54,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-27 09:46:54,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-27 09:46:54,826 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-27 09:46:54,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1379299830] [2023-08-27 09:46:54,826 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1379299830] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-27 09:46:54,826 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-27 09:46:54,826 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-27 09:46:54,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118820128] [2023-08-27 09:46:54,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-27 09:46:54,836 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-27 09:46:54,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-27 09:46:54,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-27 09:46:54,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-27 09:46:54,837 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 106 out of 278 [2023-08-27 09:46:54,837 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 28 places, 24 transitions, 69 flow. Second operand has 2 states, 2 states have (on average 108.0) internal successors, (216), 2 states have internal predecessors, (216), 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) [2023-08-27 09:46:54,837 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-27 09:46:54,837 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 106 of 278 [2023-08-27 09:46:54,837 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-27 09:46:54,880 INFO L124 PetriNetUnfolderBase]: 110/225 cut-off events. [2023-08-27 09:46:54,880 INFO L125 PetriNetUnfolderBase]: For 79/79 co-relation queries the response was YES. [2023-08-27 09:46:54,881 INFO L83 FinitePrefix]: Finished finitePrefix Result has 494 conditions, 225 events. 110/225 cut-off events. For 79/79 co-relation queries the response was YES. Maximal size of possible extension queue 24. Compared 893 event pairs, 110 based on Foata normal form. 0/211 useless extension candidates. Maximal degree in co-relation 127. Up to 191 conditions per place. [2023-08-27 09:46:54,881 INFO L140 encePairwiseOnDemand]: 271/278 looper letters, 0 selfloop transitions, 0 changer transitions 14/14 dead transitions. [2023-08-27 09:46:54,881 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 14 transitions, 71 flow [2023-08-27 09:46:54,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-27 09:46:54,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-27 09:46:54,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 230 transitions. [2023-08-27 09:46:54,883 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4136690647482014 [2023-08-27 09:46:54,883 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 230 transitions. [2023-08-27 09:46:54,883 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 230 transitions. [2023-08-27 09:46:54,883 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-27 09:46:54,883 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 230 transitions. [2023-08-27 09:46:54,884 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 115.0) internal successors, (230), 2 states have internal predecessors, (230), 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) [2023-08-27 09:46:54,886 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 278.0) internal successors, (834), 3 states have internal predecessors, (834), 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) [2023-08-27 09:46:54,886 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 278.0) internal successors, (834), 3 states have internal predecessors, (834), 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) [2023-08-27 09:46:54,886 INFO L175 Difference]: Start difference. First operand has 28 places, 24 transitions, 69 flow. Second operand 2 states and 230 transitions. [2023-08-27 09:46:54,886 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 14 transitions, 71 flow [2023-08-27 09:46:54,888 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 22 places, 14 transitions, 65 flow, removed 3 selfloop flow, removed 0 redundant places. [2023-08-27 09:46:54,889 INFO L231 Difference]: Finished difference. Result has 22 places, 0 transitions, 0 flow [2023-08-27 09:46:54,889 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=278, PETRI_DIFFERENCE_MINUEND_FLOW=43, PETRI_DIFFERENCE_MINUEND_PLACES=21, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=14, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=14, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=0, PETRI_PLACES=22, PETRI_TRANSITIONS=0} [2023-08-27 09:46:54,890 INFO L281 CegarLoopForPetriNet]: 28 programPoint places, -6 predicate places. [2023-08-27 09:46:54,891 INFO L495 AbstractCegarLoop]: Abstraction has has 22 places, 0 transitions, 0 flow [2023-08-27 09:46:54,891 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 108.0) internal successors, (216), 2 states have internal predecessors, (216), 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) [2023-08-27 09:46:54,891 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 4 remaining) [2023-08-27 09:46:54,891 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 4 remaining) [2023-08-27 09:46:54,891 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 4 remaining) [2023-08-27 09:46:54,891 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 4 remaining) [2023-08-27 09:46:54,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-27 09:46:54,892 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:46:54,892 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-27 09:46:54,896 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 117 places, 126 transitions, 273 flow [2023-08-27 09:46:54,907 INFO L124 PetriNetUnfolderBase]: 19/160 cut-off events. [2023-08-27 09:46:54,908 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-27 09:46:54,908 INFO L83 FinitePrefix]: Finished finitePrefix Result has 176 conditions, 160 events. 19/160 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 376 event pairs, 0 based on Foata normal form. 0/134 useless extension candidates. Maximal degree in co-relation 118. Up to 8 conditions per place. [2023-08-27 09:46:54,908 INFO L82 GeneralOperation]: Start removeDead. Operand has 117 places, 126 transitions, 273 flow [2023-08-27 09:46:54,909 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 117 places, 126 transitions, 273 flow [2023-08-27 09:46:54,909 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:46:54,909 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 117 places, 126 transitions, 273 flow [2023-08-27 09:46:54,910 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 117 places, 126 transitions, 273 flow [2023-08-27 09:46:54,910 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 117 places, 126 transitions, 273 flow [2023-08-27 09:46:54,922 INFO L124 PetriNetUnfolderBase]: 19/160 cut-off events. [2023-08-27 09:46:54,922 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-27 09:46:54,924 INFO L83 FinitePrefix]: Finished finitePrefix Result has 176 conditions, 160 events. 19/160 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 376 event pairs, 0 based on Foata normal form. 0/134 useless extension candidates. Maximal degree in co-relation 118. Up to 8 conditions per place. [2023-08-27 09:46:54,928 INFO L119 LiptonReduction]: Number of co-enabled transitions 9306 [2023-08-27 09:46:57,662 INFO L134 LiptonReduction]: Checked pairs total: 9413 [2023-08-27 09:46:57,663 INFO L136 LiptonReduction]: Total number of compositions: 150 [2023-08-27 09:46:57,664 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-27 09:46:57,664 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:46:57,664 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-27 09:46:57,667 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:46:57,667 INFO L124 PetriNetUnfolderBase]: 2/31 cut-off events. [2023-08-27 09:46:57,667 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-27 09:46:57,667 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:46:57,667 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-27 09:46:57,667 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-27 09:46:57,668 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:46:57,668 INFO L85 PathProgramCache]: Analyzing trace with hash 82836160, now seen corresponding path program 1 times [2023-08-27 09:46:57,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:46:57,668 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906149934] [2023-08-27 09:46:57,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:46:57,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:46:57,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:46:57,691 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-27 09:46:57,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:46:57,707 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-27 09:46:57,708 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-27 09:46:57,708 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-27 09:46:57,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-27 09:46:57,708 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:46:57,708 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-27 09:46:57,709 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-27 09:46:57,709 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-27 09:46:57,729 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-27 09:46:57,730 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 148 places, 160 transitions, 352 flow [2023-08-27 09:46:57,754 INFO L124 PetriNetUnfolderBase]: 25/206 cut-off events. [2023-08-27 09:46:57,754 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-27 09:46:57,755 INFO L83 FinitePrefix]: Finished finitePrefix Result has 229 conditions, 206 events. 25/206 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 544 event pairs, 0 based on Foata normal form. 0/172 useless extension candidates. Maximal degree in co-relation 168. Up to 10 conditions per place. [2023-08-27 09:46:57,755 INFO L82 GeneralOperation]: Start removeDead. Operand has 148 places, 160 transitions, 352 flow [2023-08-27 09:46:57,756 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 148 places, 160 transitions, 352 flow [2023-08-27 09:46:57,756 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:46:57,757 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 148 places, 160 transitions, 352 flow [2023-08-27 09:46:57,757 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 148 places, 160 transitions, 352 flow [2023-08-27 09:46:57,757 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 148 places, 160 transitions, 352 flow [2023-08-27 09:46:57,778 INFO L124 PetriNetUnfolderBase]: 25/206 cut-off events. [2023-08-27 09:46:57,779 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-27 09:46:57,780 INFO L83 FinitePrefix]: Finished finitePrefix Result has 229 conditions, 206 events. 25/206 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 544 event pairs, 0 based on Foata normal form. 0/172 useless extension candidates. Maximal degree in co-relation 168. Up to 10 conditions per place. [2023-08-27 09:46:57,787 INFO L119 LiptonReduction]: Number of co-enabled transitions 16896 [2023-08-27 09:47:00,062 INFO L134 LiptonReduction]: Checked pairs total: 17234 [2023-08-27 09:47:00,063 INFO L136 LiptonReduction]: Total number of compositions: 191 [2023-08-27 09:47:00,066 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-27 09:47:00,067 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:47:00,067 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-27 09:47:00,073 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:47:00,073 INFO L124 PetriNetUnfolderBase]: 1/8 cut-off events. [2023-08-27 09:47:00,073 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:47:00,073 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:47:00,073 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-27 09:47:00,073 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 1 more)] === [2023-08-27 09:47:00,074 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:47:00,074 INFO L85 PathProgramCache]: Analyzing trace with hash 47175093, now seen corresponding path program 1 times [2023-08-27 09:47:00,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:47:00,074 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364660709] [2023-08-27 09:47:00,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:47:00,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:47:00,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-27 09:47:00,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-27 09:47:00,087 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-27 09:47:00,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364660709] [2023-08-27 09:47:00,087 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364660709] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-27 09:47:00,087 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-27 09:47:00,087 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-27 09:47:00,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435422304] [2023-08-27 09:47:00,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-27 09:47:00,087 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-27 09:47:00,087 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-27 09:47:00,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-27 09:47:00,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-27 09:47:00,088 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 134 out of 351 [2023-08-27 09:47:00,088 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 33 places, 26 transitions, 84 flow. Second operand has 2 states, 2 states have (on average 136.0) internal successors, (272), 2 states have internal predecessors, (272), 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) [2023-08-27 09:47:00,089 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-27 09:47:00,089 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 134 of 351 [2023-08-27 09:47:00,089 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-27 09:47:00,160 INFO L124 PetriNetUnfolderBase]: 488/837 cut-off events. [2023-08-27 09:47:00,161 INFO L125 PetriNetUnfolderBase]: For 448/448 co-relation queries the response was YES. [2023-08-27 09:47:00,162 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1863 conditions, 837 events. 488/837 cut-off events. For 448/448 co-relation queries the response was YES. Maximal size of possible extension queue 64. Compared 3931 event pairs, 488 based on Foata normal form. 0/797 useless extension candidates. Maximal degree in co-relation 511. Up to 731 conditions per place. [2023-08-27 09:47:00,162 INFO L140 encePairwiseOnDemand]: 344/351 looper letters, 0 selfloop transitions, 0 changer transitions 17/17 dead transitions. [2023-08-27 09:47:00,163 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 27 places, 17 transitions, 94 flow [2023-08-27 09:47:00,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-27 09:47:00,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-27 09:47:00,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 289 transitions. [2023-08-27 09:47:00,164 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4116809116809117 [2023-08-27 09:47:00,164 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 289 transitions. [2023-08-27 09:47:00,164 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 289 transitions. [2023-08-27 09:47:00,164 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-27 09:47:00,164 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 289 transitions. [2023-08-27 09:47:00,164 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 144.5) internal successors, (289), 2 states have internal predecessors, (289), 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) [2023-08-27 09:47:00,166 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 351.0) internal successors, (1053), 3 states have internal predecessors, (1053), 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) [2023-08-27 09:47:00,167 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 351.0) internal successors, (1053), 3 states have internal predecessors, (1053), 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) [2023-08-27 09:47:00,167 INFO L175 Difference]: Start difference. First operand has 33 places, 26 transitions, 84 flow. Second operand 2 states and 289 transitions. [2023-08-27 09:47:00,167 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 27 places, 17 transitions, 94 flow [2023-08-27 09:47:00,170 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 17 transitions, 82 flow, removed 6 selfloop flow, removed 0 redundant places. [2023-08-27 09:47:00,170 INFO L231 Difference]: Finished difference. Result has 27 places, 0 transitions, 0 flow [2023-08-27 09:47:00,170 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=351, PETRI_DIFFERENCE_MINUEND_FLOW=54, PETRI_DIFFERENCE_MINUEND_PLACES=26, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=17, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=17, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=0, PETRI_PLACES=27, PETRI_TRANSITIONS=0} [2023-08-27 09:47:00,171 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, -6 predicate places. [2023-08-27 09:47:00,171 INFO L495 AbstractCegarLoop]: Abstraction has has 27 places, 0 transitions, 0 flow [2023-08-27 09:47:00,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 136.0) internal successors, (272), 2 states have internal predecessors, (272), 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) [2023-08-27 09:47:00,171 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 5 remaining) [2023-08-27 09:47:00,171 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-27 09:47:00,172 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 5 remaining) [2023-08-27 09:47:00,172 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 5 remaining) [2023-08-27 09:47:00,172 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 5 remaining) [2023-08-27 09:47:00,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-27 09:47:00,172 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:47:00,172 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-27 09:47:00,174 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 148 places, 160 transitions, 352 flow [2023-08-27 09:47:00,187 INFO L124 PetriNetUnfolderBase]: 25/206 cut-off events. [2023-08-27 09:47:00,187 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-27 09:47:00,188 INFO L83 FinitePrefix]: Finished finitePrefix Result has 229 conditions, 206 events. 25/206 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 544 event pairs, 0 based on Foata normal form. 0/172 useless extension candidates. Maximal degree in co-relation 168. Up to 10 conditions per place. [2023-08-27 09:47:00,188 INFO L82 GeneralOperation]: Start removeDead. Operand has 148 places, 160 transitions, 352 flow [2023-08-27 09:47:00,190 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 148 places, 160 transitions, 352 flow [2023-08-27 09:47:00,190 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:47:00,190 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 148 places, 160 transitions, 352 flow [2023-08-27 09:47:00,190 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 148 places, 160 transitions, 352 flow [2023-08-27 09:47:00,190 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 148 places, 160 transitions, 352 flow [2023-08-27 09:47:00,203 INFO L124 PetriNetUnfolderBase]: 25/206 cut-off events. [2023-08-27 09:47:00,204 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-27 09:47:00,205 INFO L83 FinitePrefix]: Finished finitePrefix Result has 229 conditions, 206 events. 25/206 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 544 event pairs, 0 based on Foata normal form. 0/172 useless extension candidates. Maximal degree in co-relation 168. Up to 10 conditions per place. [2023-08-27 09:47:00,210 INFO L119 LiptonReduction]: Number of co-enabled transitions 16896 [2023-08-27 09:47:02,209 INFO L134 LiptonReduction]: Checked pairs total: 16349 [2023-08-27 09:47:02,210 INFO L136 LiptonReduction]: Total number of compositions: 193 [2023-08-27 09:47:02,211 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-27 09:47:02,211 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:47:02,211 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-27 09:47:02,214 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:47:02,214 INFO L124 PetriNetUnfolderBase]: 1/37 cut-off events. [2023-08-27 09:47:02,214 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-27 09:47:02,214 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:47:02,214 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-27 09:47:02,214 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-27 09:47:02,214 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:47:02,214 INFO L85 PathProgramCache]: Analyzing trace with hash 1990133256, now seen corresponding path program 1 times [2023-08-27 09:47:02,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:47:02,214 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718934301] [2023-08-27 09:47:02,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:47:02,214 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:47:02,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:47:02,243 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-27 09:47:02,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:47:02,264 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-27 09:47:02,264 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-27 09:47:02,264 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-27 09:47:02,264 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-27 09:47:02,265 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:47:02,265 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-27 09:47:02,265 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-27 09:47:02,265 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-27 09:47:02,290 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-27 09:47:02,292 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 179 places, 194 transitions, 433 flow [2023-08-27 09:47:02,316 INFO L124 PetriNetUnfolderBase]: 31/252 cut-off events. [2023-08-27 09:47:02,316 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-27 09:47:02,318 INFO L83 FinitePrefix]: Finished finitePrefix Result has 283 conditions, 252 events. 31/252 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 721 event pairs, 0 based on Foata normal form. 0/210 useless extension candidates. Maximal degree in co-relation 220. Up to 12 conditions per place. [2023-08-27 09:47:02,318 INFO L82 GeneralOperation]: Start removeDead. Operand has 179 places, 194 transitions, 433 flow [2023-08-27 09:47:02,319 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 179 places, 194 transitions, 433 flow [2023-08-27 09:47:02,319 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:47:02,320 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 179 places, 194 transitions, 433 flow [2023-08-27 09:47:02,320 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 179 places, 194 transitions, 433 flow [2023-08-27 09:47:02,320 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 179 places, 194 transitions, 433 flow [2023-08-27 09:47:02,342 INFO L124 PetriNetUnfolderBase]: 31/252 cut-off events. [2023-08-27 09:47:02,342 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-27 09:47:02,344 INFO L83 FinitePrefix]: Finished finitePrefix Result has 283 conditions, 252 events. 31/252 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 721 event pairs, 0 based on Foata normal form. 0/210 useless extension candidates. Maximal degree in co-relation 220. Up to 12 conditions per place. [2023-08-27 09:47:02,349 INFO L119 LiptonReduction]: Number of co-enabled transitions 26730 [2023-08-27 09:47:06,065 INFO L134 LiptonReduction]: Checked pairs total: 28147 [2023-08-27 09:47:06,066 INFO L136 LiptonReduction]: Total number of compositions: 241 [2023-08-27 09:47:06,069 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-27 09:47:06,070 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:47:06,070 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-27 09:47:06,071 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:47:06,071 INFO L124 PetriNetUnfolderBase]: 0/5 cut-off events. [2023-08-27 09:47:06,071 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:47:06,071 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:47:06,071 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-27 09:47:06,071 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 2 more)] === [2023-08-27 09:47:06,071 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:47:06,071 INFO L85 PathProgramCache]: Analyzing trace with hash 67468909, now seen corresponding path program 1 times [2023-08-27 09:47:06,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:47:06,071 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274053579] [2023-08-27 09:47:06,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:47:06,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:47:06,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-27 09:47:06,106 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-27 09:47:06,106 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-27 09:47:06,106 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274053579] [2023-08-27 09:47:06,106 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [274053579] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-27 09:47:06,106 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-27 09:47:06,107 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-27 09:47:06,107 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527631382] [2023-08-27 09:47:06,107 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-27 09:47:06,107 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-27 09:47:06,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-27 09:47:06,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-27 09:47:06,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-27 09:47:06,108 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 162 out of 435 [2023-08-27 09:47:06,108 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 39 places, 30 transitions, 105 flow. Second operand has 2 states, 2 states have (on average 164.0) internal successors, (328), 2 states have internal predecessors, (328), 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) [2023-08-27 09:47:06,108 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-27 09:47:06,108 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 162 of 435 [2023-08-27 09:47:06,108 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-27 09:47:06,393 INFO L124 PetriNetUnfolderBase]: 1946/2997 cut-off events. [2023-08-27 09:47:06,394 INFO L125 PetriNetUnfolderBase]: For 2176/2176 co-relation queries the response was YES. [2023-08-27 09:47:06,398 INFO L83 FinitePrefix]: Finished finitePrefix Result has 6751 conditions, 2997 events. 1946/2997 cut-off events. For 2176/2176 co-relation queries the response was YES. Maximal size of possible extension queue 177. Compared 15458 event pairs, 1946 based on Foata normal form. 0/2876 useless extension candidates. Maximal degree in co-relation 1924. Up to 2675 conditions per place. [2023-08-27 09:47:06,400 INFO L140 encePairwiseOnDemand]: 427/435 looper letters, 0 selfloop transitions, 0 changer transitions 20/20 dead transitions. [2023-08-27 09:47:06,400 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 32 places, 20 transitions, 119 flow [2023-08-27 09:47:06,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-27 09:47:06,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-27 09:47:06,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 349 transitions. [2023-08-27 09:47:06,402 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4011494252873563 [2023-08-27 09:47:06,402 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 349 transitions. [2023-08-27 09:47:06,402 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 349 transitions. [2023-08-27 09:47:06,402 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-27 09:47:06,402 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 349 transitions. [2023-08-27 09:47:06,403 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 174.5) internal successors, (349), 2 states have internal predecessors, (349), 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) [2023-08-27 09:47:06,404 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 435.0) internal successors, (1305), 3 states have internal predecessors, (1305), 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) [2023-08-27 09:47:06,405 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 435.0) internal successors, (1305), 3 states have internal predecessors, (1305), 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) [2023-08-27 09:47:06,405 INFO L175 Difference]: Start difference. First operand has 39 places, 30 transitions, 105 flow. Second operand 2 states and 349 transitions. [2023-08-27 09:47:06,405 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 32 places, 20 transitions, 119 flow [2023-08-27 09:47:06,409 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 32 places, 20 transitions, 99 flow, removed 10 selfloop flow, removed 0 redundant places. [2023-08-27 09:47:06,409 INFO L231 Difference]: Finished difference. Result has 32 places, 0 transitions, 0 flow [2023-08-27 09:47:06,409 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=435, PETRI_DIFFERENCE_MINUEND_FLOW=65, PETRI_DIFFERENCE_MINUEND_PLACES=31, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=0, PETRI_PLACES=32, PETRI_TRANSITIONS=0} [2023-08-27 09:47:06,411 INFO L281 CegarLoopForPetriNet]: 39 programPoint places, -7 predicate places. [2023-08-27 09:47:06,411 INFO L495 AbstractCegarLoop]: Abstraction has has 32 places, 0 transitions, 0 flow [2023-08-27 09:47:06,411 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 164.0) internal successors, (328), 2 states have internal predecessors, (328), 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) [2023-08-27 09:47:06,411 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 6 remaining) [2023-08-27 09:47:06,411 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 6 remaining) [2023-08-27 09:47:06,411 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 6 remaining) [2023-08-27 09:47:06,412 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 6 remaining) [2023-08-27 09:47:06,412 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 6 remaining) [2023-08-27 09:47:06,412 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 6 remaining) [2023-08-27 09:47:06,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-27 09:47:06,412 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:47:06,414 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-27 09:47:06,415 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 179 places, 194 transitions, 433 flow [2023-08-27 09:47:06,440 INFO L124 PetriNetUnfolderBase]: 31/252 cut-off events. [2023-08-27 09:47:06,441 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-27 09:47:06,442 INFO L83 FinitePrefix]: Finished finitePrefix Result has 283 conditions, 252 events. 31/252 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 721 event pairs, 0 based on Foata normal form. 0/210 useless extension candidates. Maximal degree in co-relation 220. Up to 12 conditions per place. [2023-08-27 09:47:06,442 INFO L82 GeneralOperation]: Start removeDead. Operand has 179 places, 194 transitions, 433 flow [2023-08-27 09:47:06,444 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 179 places, 194 transitions, 433 flow [2023-08-27 09:47:06,444 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:47:06,445 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 179 places, 194 transitions, 433 flow [2023-08-27 09:47:06,445 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 179 places, 194 transitions, 433 flow [2023-08-27 09:47:06,445 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 179 places, 194 transitions, 433 flow [2023-08-27 09:47:06,468 INFO L124 PetriNetUnfolderBase]: 31/252 cut-off events. [2023-08-27 09:47:06,468 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-27 09:47:06,470 INFO L83 FinitePrefix]: Finished finitePrefix Result has 283 conditions, 252 events. 31/252 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 721 event pairs, 0 based on Foata normal form. 0/210 useless extension candidates. Maximal degree in co-relation 220. Up to 12 conditions per place. [2023-08-27 09:47:06,476 INFO L119 LiptonReduction]: Number of co-enabled transitions 26730 [2023-08-27 09:47:09,989 INFO L134 LiptonReduction]: Checked pairs total: 27929 [2023-08-27 09:47:09,989 INFO L136 LiptonReduction]: Total number of compositions: 240 [2023-08-27 09:47:09,990 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-27 09:47:09,990 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:47:09,990 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-27 09:47:09,993 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:47:09,994 INFO L124 PetriNetUnfolderBase]: 4/51 cut-off events. [2023-08-27 09:47:09,994 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-27 09:47:09,994 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:47:09,994 INFO L208 CegarLoopForPetriNet]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-08-27 09:47:09,994 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-27 09:47:09,994 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:47:09,994 INFO L85 PathProgramCache]: Analyzing trace with hash -1363584049, now seen corresponding path program 1 times [2023-08-27 09:47:09,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:47:09,994 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198039245] [2023-08-27 09:47:09,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:47:09,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:47:10,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:47:10,005 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-27 09:47:10,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:47:10,015 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-27 09:47:10,015 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-27 09:47:10,015 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-27 09:47:10,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-27 09:47:10,015 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:47:10,015 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-27 09:47:10,016 WARN L233 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-27 09:47:10,016 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2023-08-27 09:47:10,048 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-27 09:47:10,049 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 210 places, 228 transitions, 516 flow [2023-08-27 09:47:10,089 INFO L124 PetriNetUnfolderBase]: 37/298 cut-off events. [2023-08-27 09:47:10,089 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-27 09:47:10,090 INFO L83 FinitePrefix]: Finished finitePrefix Result has 338 conditions, 298 events. 37/298 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 871 event pairs, 0 based on Foata normal form. 0/248 useless extension candidates. Maximal degree in co-relation 274. Up to 14 conditions per place. [2023-08-27 09:47:10,090 INFO L82 GeneralOperation]: Start removeDead. Operand has 210 places, 228 transitions, 516 flow [2023-08-27 09:47:10,092 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 210 places, 228 transitions, 516 flow [2023-08-27 09:47:10,109 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:47:10,109 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 210 places, 228 transitions, 516 flow [2023-08-27 09:47:10,109 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 210 places, 228 transitions, 516 flow [2023-08-27 09:47:10,109 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 210 places, 228 transitions, 516 flow [2023-08-27 09:47:10,158 INFO L124 PetriNetUnfolderBase]: 37/298 cut-off events. [2023-08-27 09:47:10,158 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-27 09:47:10,161 INFO L83 FinitePrefix]: Finished finitePrefix Result has 338 conditions, 298 events. 37/298 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 871 event pairs, 0 based on Foata normal form. 0/248 useless extension candidates. Maximal degree in co-relation 274. Up to 14 conditions per place. [2023-08-27 09:47:10,169 INFO L119 LiptonReduction]: Number of co-enabled transitions 38808 [2023-08-27 09:47:13,242 INFO L134 LiptonReduction]: Checked pairs total: 39894 [2023-08-27 09:47:13,242 INFO L136 LiptonReduction]: Total number of compositions: 276 [2023-08-27 09:47:13,243 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-27 09:47:13,243 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:47:13,243 INFO L358 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2023-08-27 09:47:13,244 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:47:13,244 INFO L124 PetriNetUnfolderBase]: 2/10 cut-off events. [2023-08-27 09:47:13,244 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:47:13,244 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:47:13,244 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-27 09:47:13,244 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-27 09:47:13,244 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:47:13,244 INFO L85 PathProgramCache]: Analyzing trace with hash 91454256, now seen corresponding path program 1 times [2023-08-27 09:47:13,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:47:13,245 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162987943] [2023-08-27 09:47:13,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:47:13,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:47:13,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-27 09:47:13,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-27 09:47:13,252 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-27 09:47:13,252 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162987943] [2023-08-27 09:47:13,252 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162987943] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-27 09:47:13,252 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-27 09:47:13,252 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-27 09:47:13,253 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411796527] [2023-08-27 09:47:13,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-27 09:47:13,253 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-27 09:47:13,253 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-27 09:47:13,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-27 09:47:13,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-27 09:47:13,253 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 190 out of 504 [2023-08-27 09:47:13,254 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 40 transitions, 140 flow. Second operand has 2 states, 2 states have (on average 192.0) internal successors, (384), 2 states have internal predecessors, (384), 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) [2023-08-27 09:47:13,254 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-27 09:47:13,254 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 190 of 504 [2023-08-27 09:47:13,254 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-27 09:47:14,157 INFO L124 PetriNetUnfolderBase]: 7292/10449 cut-off events. [2023-08-27 09:47:14,157 INFO L125 PetriNetUnfolderBase]: For 9628/9628 co-relation queries the response was YES. [2023-08-27 09:47:14,169 INFO L83 FinitePrefix]: Finished finitePrefix Result has 23762 conditions, 10449 events. 7292/10449 cut-off events. For 9628/9628 co-relation queries the response was YES. Maximal size of possible extension queue 499. Compared 57443 event pairs, 7292 based on Foata normal form. 0/10084 useless extension candidates. Maximal degree in co-relation 6946. Up to 9479 conditions per place. [2023-08-27 09:47:14,176 INFO L140 encePairwiseOnDemand]: 492/504 looper letters, 0 selfloop transitions, 0 changer transitions 23/23 dead transitions. [2023-08-27 09:47:14,176 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 23 transitions, 146 flow [2023-08-27 09:47:14,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-27 09:47:14,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-27 09:47:14,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 412 transitions. [2023-08-27 09:47:14,178 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4087301587301587 [2023-08-27 09:47:14,178 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 412 transitions. [2023-08-27 09:47:14,178 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 412 transitions. [2023-08-27 09:47:14,178 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-27 09:47:14,178 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 412 transitions. [2023-08-27 09:47:14,179 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 206.0) internal successors, (412), 2 states have internal predecessors, (412), 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) [2023-08-27 09:47:14,180 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 504.0) internal successors, (1512), 3 states have internal predecessors, (1512), 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) [2023-08-27 09:47:14,181 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 504.0) internal successors, (1512), 3 states have internal predecessors, (1512), 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) [2023-08-27 09:47:14,181 INFO L175 Difference]: Start difference. First operand has 48 places, 40 transitions, 140 flow. Second operand 2 states and 412 transitions. [2023-08-27 09:47:14,181 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 23 transitions, 146 flow [2023-08-27 09:47:14,188 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 23 transitions, 116 flow, removed 15 selfloop flow, removed 0 redundant places. [2023-08-27 09:47:14,188 INFO L231 Difference]: Finished difference. Result has 37 places, 0 transitions, 0 flow [2023-08-27 09:47:14,188 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=504, PETRI_DIFFERENCE_MINUEND_FLOW=76, PETRI_DIFFERENCE_MINUEND_PLACES=36, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=23, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=0, PETRI_PLACES=37, PETRI_TRANSITIONS=0} [2023-08-27 09:47:14,189 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, -11 predicate places. [2023-08-27 09:47:14,189 INFO L495 AbstractCegarLoop]: Abstraction has has 37 places, 0 transitions, 0 flow [2023-08-27 09:47:14,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 192.0) internal successors, (384), 2 states have internal predecessors, (384), 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) [2023-08-27 09:47:14,189 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (6 of 7 remaining) [2023-08-27 09:47:14,189 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 7 remaining) [2023-08-27 09:47:14,189 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 7 remaining) [2023-08-27 09:47:14,189 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 7 remaining) [2023-08-27 09:47:14,189 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 7 remaining) [2023-08-27 09:47:14,189 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 7 remaining) [2023-08-27 09:47:14,190 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 7 remaining) [2023-08-27 09:47:14,190 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-08-27 09:47:14,190 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:47:14,190 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-27 09:47:14,191 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 210 places, 228 transitions, 516 flow [2023-08-27 09:47:14,217 INFO L124 PetriNetUnfolderBase]: 37/298 cut-off events. [2023-08-27 09:47:14,218 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-27 09:47:14,219 INFO L83 FinitePrefix]: Finished finitePrefix Result has 338 conditions, 298 events. 37/298 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 871 event pairs, 0 based on Foata normal form. 0/248 useless extension candidates. Maximal degree in co-relation 274. Up to 14 conditions per place. [2023-08-27 09:47:14,219 INFO L82 GeneralOperation]: Start removeDead. Operand has 210 places, 228 transitions, 516 flow [2023-08-27 09:47:14,221 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 210 places, 228 transitions, 516 flow [2023-08-27 09:47:14,221 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:47:14,221 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 210 places, 228 transitions, 516 flow [2023-08-27 09:47:14,221 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 210 places, 228 transitions, 516 flow [2023-08-27 09:47:14,221 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 210 places, 228 transitions, 516 flow [2023-08-27 09:47:14,247 INFO L124 PetriNetUnfolderBase]: 37/298 cut-off events. [2023-08-27 09:47:14,247 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-27 09:47:14,249 INFO L83 FinitePrefix]: Finished finitePrefix Result has 338 conditions, 298 events. 37/298 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 871 event pairs, 0 based on Foata normal form. 0/248 useless extension candidates. Maximal degree in co-relation 274. Up to 14 conditions per place. [2023-08-27 09:47:14,256 INFO L119 LiptonReduction]: Number of co-enabled transitions 38808 [2023-08-27 09:47:17,648 INFO L134 LiptonReduction]: Checked pairs total: 40775 [2023-08-27 09:47:17,648 INFO L136 LiptonReduction]: Total number of compositions: 277 [2023-08-27 09:47:17,651 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-27 09:47:17,651 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:47:17,651 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-27 09:47:17,658 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:47:17,659 INFO L124 PetriNetUnfolderBase]: 7/65 cut-off events. [2023-08-27 09:47:17,659 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-27 09:47:17,659 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:47:17,659 INFO L208 CegarLoopForPetriNet]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-27 09:47:17,659 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-27 09:47:17,659 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:47:17,659 INFO L85 PathProgramCache]: Analyzing trace with hash 557216983, now seen corresponding path program 1 times [2023-08-27 09:47:17,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:47:17,659 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55709927] [2023-08-27 09:47:17,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:47:17,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:47:17,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:47:17,677 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-27 09:47:17,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:47:17,692 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-27 09:47:17,693 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-27 09:47:17,693 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-27 09:47:17,693 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-27 09:47:17,693 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:47:17,693 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-27 09:47:17,693 WARN L233 ceAbstractionStarter]: 6 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-27 09:47:17,693 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 7 thread instances. [2023-08-27 09:47:17,711 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-27 09:47:17,712 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 241 places, 262 transitions, 601 flow [2023-08-27 09:47:17,740 INFO L124 PetriNetUnfolderBase]: 43/344 cut-off events. [2023-08-27 09:47:17,740 INFO L125 PetriNetUnfolderBase]: For 77/77 co-relation queries the response was YES. [2023-08-27 09:47:17,742 INFO L83 FinitePrefix]: Finished finitePrefix Result has 394 conditions, 344 events. 43/344 cut-off events. For 77/77 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1065 event pairs, 0 based on Foata normal form. 0/286 useless extension candidates. Maximal degree in co-relation 329. Up to 16 conditions per place. [2023-08-27 09:47:17,742 INFO L82 GeneralOperation]: Start removeDead. Operand has 241 places, 262 transitions, 601 flow [2023-08-27 09:47:17,745 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 241 places, 262 transitions, 601 flow [2023-08-27 09:47:17,745 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:47:17,745 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 241 places, 262 transitions, 601 flow [2023-08-27 09:47:17,745 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 241 places, 262 transitions, 601 flow [2023-08-27 09:47:17,745 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 241 places, 262 transitions, 601 flow [2023-08-27 09:47:17,774 INFO L124 PetriNetUnfolderBase]: 43/344 cut-off events. [2023-08-27 09:47:17,774 INFO L125 PetriNetUnfolderBase]: For 77/77 co-relation queries the response was YES. [2023-08-27 09:47:17,775 INFO L83 FinitePrefix]: Finished finitePrefix Result has 394 conditions, 344 events. 43/344 cut-off events. For 77/77 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1065 event pairs, 0 based on Foata normal form. 0/286 useless extension candidates. Maximal degree in co-relation 329. Up to 16 conditions per place. [2023-08-27 09:47:17,784 INFO L119 LiptonReduction]: Number of co-enabled transitions 53130 [2023-08-27 09:47:22,801 INFO L134 LiptonReduction]: Checked pairs total: 53493 [2023-08-27 09:47:22,801 INFO L136 LiptonReduction]: Total number of compositions: 322 [2023-08-27 09:47:22,802 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-27 09:47:22,802 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:47:22,802 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-08-27 09:47:22,803 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:47:22,803 INFO L124 PetriNetUnfolderBase]: 0/6 cut-off events. [2023-08-27 09:47:22,803 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:47:22,803 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:47:22,803 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-27 09:47:22,803 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-27 09:47:22,803 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:47:22,803 INFO L85 PathProgramCache]: Analyzing trace with hash 118482668, now seen corresponding path program 1 times [2023-08-27 09:47:22,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:47:22,803 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812483602] [2023-08-27 09:47:22,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:47:22,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:47:22,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-27 09:47:22,810 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-27 09:47:22,810 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-27 09:47:22,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812483602] [2023-08-27 09:47:22,811 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [812483602] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-27 09:47:22,811 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-27 09:47:22,811 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-27 09:47:22,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587798764] [2023-08-27 09:47:22,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-27 09:47:22,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-27 09:47:22,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-27 09:47:22,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-27 09:47:22,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-27 09:47:22,812 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 218 out of 584 [2023-08-27 09:47:22,812 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 52 places, 40 transitions, 157 flow. Second operand has 2 states, 2 states have (on average 220.0) internal successors, (440), 2 states have internal predecessors, (440), 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) [2023-08-27 09:47:22,812 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-27 09:47:22,812 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 218 of 584 [2023-08-27 09:47:22,812 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-27 09:47:25,802 INFO L124 PetriNetUnfolderBase]: 26246/35721 cut-off events. [2023-08-27 09:47:25,802 INFO L125 PetriNetUnfolderBase]: For 40003/40003 co-relation queries the response was YES. [2023-08-27 09:47:25,853 INFO L83 FinitePrefix]: Finished finitePrefix Result has 81840 conditions, 35721 events. 26246/35721 cut-off events. For 40003/40003 co-relation queries the response was YES. Maximal size of possible extension queue 1425. Compared 206078 event pairs, 26246 based on Foata normal form. 0/34627 useless extension candidates. Maximal degree in co-relation 24361. Up to 32807 conditions per place. [2023-08-27 09:47:25,873 INFO L140 encePairwiseOnDemand]: 573/584 looper letters, 0 selfloop transitions, 0 changer transitions 26/26 dead transitions. [2023-08-27 09:47:25,874 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 42 places, 26 transitions, 175 flow [2023-08-27 09:47:25,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-27 09:47:25,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-27 09:47:25,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 470 transitions. [2023-08-27 09:47:25,875 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4023972602739726 [2023-08-27 09:47:25,875 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 470 transitions. [2023-08-27 09:47:25,875 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 470 transitions. [2023-08-27 09:47:25,875 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-27 09:47:25,875 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 470 transitions. [2023-08-27 09:47:25,959 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 235.0) internal successors, (470), 2 states have internal predecessors, (470), 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) [2023-08-27 09:47:25,961 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 584.0) internal successors, (1752), 3 states have internal predecessors, (1752), 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) [2023-08-27 09:47:25,961 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 584.0) internal successors, (1752), 3 states have internal predecessors, (1752), 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) [2023-08-27 09:47:25,961 INFO L175 Difference]: Start difference. First operand has 52 places, 40 transitions, 157 flow. Second operand 2 states and 470 transitions. [2023-08-27 09:47:25,961 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 42 places, 26 transitions, 175 flow [2023-08-27 09:47:26,003 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 42 places, 26 transitions, 133 flow, removed 21 selfloop flow, removed 0 redundant places. [2023-08-27 09:47:26,003 INFO L231 Difference]: Finished difference. Result has 42 places, 0 transitions, 0 flow [2023-08-27 09:47:26,003 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=584, PETRI_DIFFERENCE_MINUEND_FLOW=87, PETRI_DIFFERENCE_MINUEND_PLACES=41, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=26, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=0, PETRI_PLACES=42, PETRI_TRANSITIONS=0} [2023-08-27 09:47:26,004 INFO L281 CegarLoopForPetriNet]: 52 programPoint places, -10 predicate places. [2023-08-27 09:47:26,004 INFO L495 AbstractCegarLoop]: Abstraction has has 42 places, 0 transitions, 0 flow [2023-08-27 09:47:26,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 220.0) internal successors, (440), 2 states have internal predecessors, (440), 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) [2023-08-27 09:47:26,004 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (7 of 8 remaining) [2023-08-27 09:47:26,004 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (6 of 8 remaining) [2023-08-27 09:47:26,004 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 8 remaining) [2023-08-27 09:47:26,005 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 8 remaining) [2023-08-27 09:47:26,005 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 8 remaining) [2023-08-27 09:47:26,005 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 8 remaining) [2023-08-27 09:47:26,005 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 8 remaining) [2023-08-27 09:47:26,005 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 8 remaining) [2023-08-27 09:47:26,005 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-27 09:47:26,005 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:47:26,005 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-27 09:47:26,006 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 241 places, 262 transitions, 601 flow [2023-08-27 09:47:26,034 INFO L124 PetriNetUnfolderBase]: 43/344 cut-off events. [2023-08-27 09:47:26,034 INFO L125 PetriNetUnfolderBase]: For 77/77 co-relation queries the response was YES. [2023-08-27 09:47:26,037 INFO L83 FinitePrefix]: Finished finitePrefix Result has 394 conditions, 344 events. 43/344 cut-off events. For 77/77 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1065 event pairs, 0 based on Foata normal form. 0/286 useless extension candidates. Maximal degree in co-relation 329. Up to 16 conditions per place. [2023-08-27 09:47:26,037 INFO L82 GeneralOperation]: Start removeDead. Operand has 241 places, 262 transitions, 601 flow [2023-08-27 09:47:26,039 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 241 places, 262 transitions, 601 flow [2023-08-27 09:47:26,039 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:47:26,039 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 241 places, 262 transitions, 601 flow [2023-08-27 09:47:26,039 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 241 places, 262 transitions, 601 flow [2023-08-27 09:47:26,039 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 241 places, 262 transitions, 601 flow [2023-08-27 09:47:26,067 INFO L124 PetriNetUnfolderBase]: 43/344 cut-off events. [2023-08-27 09:47:26,067 INFO L125 PetriNetUnfolderBase]: For 77/77 co-relation queries the response was YES. [2023-08-27 09:47:26,069 INFO L83 FinitePrefix]: Finished finitePrefix Result has 394 conditions, 344 events. 43/344 cut-off events. For 77/77 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1065 event pairs, 0 based on Foata normal form. 0/286 useless extension candidates. Maximal degree in co-relation 329. Up to 16 conditions per place. [2023-08-27 09:47:26,077 INFO L119 LiptonReduction]: Number of co-enabled transitions 53130 [2023-08-27 09:47:30,376 INFO L134 LiptonReduction]: Checked pairs total: 55231 [2023-08-27 09:47:30,376 INFO L136 LiptonReduction]: Total number of compositions: 327 [2023-08-27 09:47:30,377 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-27 09:47:30,377 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:47:30,378 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-27 09:47:30,381 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:47:30,381 INFO L124 PetriNetUnfolderBase]: 3/65 cut-off events. [2023-08-27 09:47:30,381 INFO L125 PetriNetUnfolderBase]: For 77/77 co-relation queries the response was YES. [2023-08-27 09:47:30,382 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:47:30,382 INFO L208 CegarLoopForPetriNet]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-27 09:47:30,382 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-27 09:47:30,382 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:47:30,382 INFO L85 PathProgramCache]: Analyzing trace with hash 1709044078, now seen corresponding path program 1 times [2023-08-27 09:47:30,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:47:30,382 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130903566] [2023-08-27 09:47:30,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:47:30,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:47:30,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:47:30,406 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-27 09:47:30,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:47:30,423 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-27 09:47:30,423 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-27 09:47:30,423 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-27 09:47:30,423 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-27 09:47:30,424 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:47:30,425 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-27 09:47:30,425 WARN L233 ceAbstractionStarter]: 7 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-27 09:47:30,425 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 8 thread instances. [2023-08-27 09:47:30,449 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-27 09:47:30,450 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 272 places, 296 transitions, 688 flow [2023-08-27 09:47:30,583 INFO L124 PetriNetUnfolderBase]: 49/390 cut-off events. [2023-08-27 09:47:30,583 INFO L125 PetriNetUnfolderBase]: For 112/112 co-relation queries the response was YES. [2023-08-27 09:47:30,586 INFO L83 FinitePrefix]: Finished finitePrefix Result has 451 conditions, 390 events. 49/390 cut-off events. For 112/112 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1222 event pairs, 0 based on Foata normal form. 0/324 useless extension candidates. Maximal degree in co-relation 385. Up to 18 conditions per place. [2023-08-27 09:47:30,586 INFO L82 GeneralOperation]: Start removeDead. Operand has 272 places, 296 transitions, 688 flow [2023-08-27 09:47:30,588 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 272 places, 296 transitions, 688 flow [2023-08-27 09:47:30,589 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:47:30,597 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 272 places, 296 transitions, 688 flow [2023-08-27 09:47:30,597 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 272 places, 296 transitions, 688 flow [2023-08-27 09:47:30,597 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 272 places, 296 transitions, 688 flow [2023-08-27 09:47:30,639 INFO L124 PetriNetUnfolderBase]: 49/390 cut-off events. [2023-08-27 09:47:30,639 INFO L125 PetriNetUnfolderBase]: For 112/112 co-relation queries the response was YES. [2023-08-27 09:47:30,642 INFO L83 FinitePrefix]: Finished finitePrefix Result has 451 conditions, 390 events. 49/390 cut-off events. For 112/112 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1222 event pairs, 0 based on Foata normal form. 0/324 useless extension candidates. Maximal degree in co-relation 385. Up to 18 conditions per place. [2023-08-27 09:47:30,651 INFO L119 LiptonReduction]: Number of co-enabled transitions 69696 [2023-08-27 09:47:34,944 INFO L134 LiptonReduction]: Checked pairs total: 74105 [2023-08-27 09:47:34,944 INFO L136 LiptonReduction]: Total number of compositions: 371 [2023-08-27 09:47:34,945 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-27 09:47:34,945 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:47:34,945 INFO L358 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2023-08-27 09:47:34,946 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:47:34,946 INFO L124 PetriNetUnfolderBase]: 0/6 cut-off events. [2023-08-27 09:47:34,946 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:47:34,946 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:47:34,946 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-27 09:47:34,946 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-27 09:47:34,946 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:47:34,946 INFO L85 PathProgramCache]: Analyzing trace with hash 149960803, now seen corresponding path program 1 times [2023-08-27 09:47:34,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:47:34,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570851382] [2023-08-27 09:47:34,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:47:34,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:47:34,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-27 09:47:34,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-27 09:47:34,956 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-27 09:47:34,956 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570851382] [2023-08-27 09:47:34,956 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570851382] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-27 09:47:34,956 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-27 09:47:34,956 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-27 09:47:34,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514865494] [2023-08-27 09:47:34,956 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-27 09:47:34,956 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-27 09:47:34,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-27 09:47:34,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-27 09:47:34,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-27 09:47:34,957 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 246 out of 667 [2023-08-27 09:47:34,958 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 50 transitions, 196 flow. Second operand has 2 states, 2 states have (on average 248.0) internal successors, (496), 2 states have internal predecessors, (496), 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) [2023-08-27 09:47:34,958 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-27 09:47:34,958 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 246 of 667 [2023-08-27 09:47:34,958 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-27 09:47:45,723 INFO L124 PetriNetUnfolderBase]: 91856/120285 cut-off events. [2023-08-27 09:47:45,723 INFO L125 PetriNetUnfolderBase]: For 158830/158830 co-relation queries the response was YES. [2023-08-27 09:47:45,961 INFO L83 FinitePrefix]: Finished finitePrefix Result has 277213 conditions, 120285 events. 91856/120285 cut-off events. For 158830/158830 co-relation queries the response was YES. Maximal size of possible extension queue 4108. Compared 716120 event pairs, 91856 based on Foata normal form. 0/117005 useless extension candidates. Maximal degree in co-relation 83653. Up to 111539 conditions per place. [2023-08-27 09:47:46,028 INFO L140 encePairwiseOnDemand]: 652/667 looper letters, 0 selfloop transitions, 0 changer transitions 29/29 dead transitions. [2023-08-27 09:47:46,028 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 47 places, 29 transitions, 206 flow [2023-08-27 09:47:46,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-27 09:47:46,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-27 09:47:46,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 533 transitions. [2023-08-27 09:47:46,030 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3995502248875562 [2023-08-27 09:47:46,030 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 533 transitions. [2023-08-27 09:47:46,030 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 533 transitions. [2023-08-27 09:47:46,030 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-27 09:47:46,030 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 533 transitions. [2023-08-27 09:47:46,031 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 266.5) internal successors, (533), 2 states have internal predecessors, (533), 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) [2023-08-27 09:47:46,033 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 667.0) internal successors, (2001), 3 states have internal predecessors, (2001), 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) [2023-08-27 09:47:46,034 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 667.0) internal successors, (2001), 3 states have internal predecessors, (2001), 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) [2023-08-27 09:47:46,034 INFO L175 Difference]: Start difference. First operand has 61 places, 50 transitions, 196 flow. Second operand 2 states and 533 transitions. [2023-08-27 09:47:46,034 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 47 places, 29 transitions, 206 flow [2023-08-27 09:47:46,144 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 47 places, 29 transitions, 150 flow, removed 28 selfloop flow, removed 0 redundant places. [2023-08-27 09:47:46,145 INFO L231 Difference]: Finished difference. Result has 47 places, 0 transitions, 0 flow [2023-08-27 09:47:46,145 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=667, PETRI_DIFFERENCE_MINUEND_FLOW=98, PETRI_DIFFERENCE_MINUEND_PLACES=46, 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=2, PETRI_FLOW=0, PETRI_PLACES=47, PETRI_TRANSITIONS=0} [2023-08-27 09:47:46,146 INFO L281 CegarLoopForPetriNet]: 61 programPoint places, -14 predicate places. [2023-08-27 09:47:46,146 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 0 transitions, 0 flow [2023-08-27 09:47:46,147 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 248.0) internal successors, (496), 2 states have internal predecessors, (496), 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) [2023-08-27 09:47:46,147 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (8 of 9 remaining) [2023-08-27 09:47:46,147 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (7 of 9 remaining) [2023-08-27 09:47:46,147 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (6 of 9 remaining) [2023-08-27 09:47:46,147 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 9 remaining) [2023-08-27 09:47:46,147 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 9 remaining) [2023-08-27 09:47:46,147 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 9 remaining) [2023-08-27 09:47:46,147 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 9 remaining) [2023-08-27 09:47:46,147 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 9 remaining) [2023-08-27 09:47:46,147 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 9 remaining) [2023-08-27 09:47:46,148 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-27 09:47:46,148 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:47:46,148 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-27 09:47:46,150 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 272 places, 296 transitions, 688 flow [2023-08-27 09:47:46,193 INFO L124 PetriNetUnfolderBase]: 49/390 cut-off events. [2023-08-27 09:47:46,193 INFO L125 PetriNetUnfolderBase]: For 112/112 co-relation queries the response was YES. [2023-08-27 09:47:46,196 INFO L83 FinitePrefix]: Finished finitePrefix Result has 451 conditions, 390 events. 49/390 cut-off events. For 112/112 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1222 event pairs, 0 based on Foata normal form. 0/324 useless extension candidates. Maximal degree in co-relation 385. Up to 18 conditions per place. [2023-08-27 09:47:46,196 INFO L82 GeneralOperation]: Start removeDead. Operand has 272 places, 296 transitions, 688 flow [2023-08-27 09:47:46,198 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 272 places, 296 transitions, 688 flow [2023-08-27 09:47:46,199 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:47:46,199 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 272 places, 296 transitions, 688 flow [2023-08-27 09:47:46,199 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 272 places, 296 transitions, 688 flow [2023-08-27 09:47:46,199 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 272 places, 296 transitions, 688 flow [2023-08-27 09:47:46,241 INFO L124 PetriNetUnfolderBase]: 49/390 cut-off events. [2023-08-27 09:47:46,241 INFO L125 PetriNetUnfolderBase]: For 112/112 co-relation queries the response was YES. [2023-08-27 09:47:46,244 INFO L83 FinitePrefix]: Finished finitePrefix Result has 451 conditions, 390 events. 49/390 cut-off events. For 112/112 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1222 event pairs, 0 based on Foata normal form. 0/324 useless extension candidates. Maximal degree in co-relation 385. Up to 18 conditions per place. [2023-08-27 09:47:46,256 INFO L119 LiptonReduction]: Number of co-enabled transitions 69696 [2023-08-27 09:47:51,478 INFO L134 LiptonReduction]: Checked pairs total: 73351 [2023-08-27 09:47:51,478 INFO L136 LiptonReduction]: Total number of compositions: 368 [2023-08-27 09:47:51,479 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-27 09:47:51,479 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:47:51,479 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-27 09:47:51,484 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:47:51,484 INFO L124 PetriNetUnfolderBase]: 5/77 cut-off events. [2023-08-27 09:47:51,484 INFO L125 PetriNetUnfolderBase]: For 112/112 co-relation queries the response was YES. [2023-08-27 09:47:51,484 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:47:51,484 INFO L208 CegarLoopForPetriNet]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-27 09:47:51,484 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-27 09:47:51,484 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:47:51,484 INFO L85 PathProgramCache]: Analyzing trace with hash -1541598870, now seen corresponding path program 1 times [2023-08-27 09:47:51,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:47:51,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051758149] [2023-08-27 09:47:51,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:47:51,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:47:51,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:47:51,522 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-27 09:47:51,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:47:51,535 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-27 09:47:51,536 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-27 09:47:51,537 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-27 09:47:51,537 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-08-27 09:47:51,537 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:47:51,537 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-27 09:47:51,537 WARN L233 ceAbstractionStarter]: 8 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-27 09:47:51,537 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 9 thread instances. [2023-08-27 09:47:51,557 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-27 09:47:51,559 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 303 places, 330 transitions, 777 flow [2023-08-27 09:47:51,601 INFO L124 PetriNetUnfolderBase]: 55/436 cut-off events. [2023-08-27 09:47:51,602 INFO L125 PetriNetUnfolderBase]: For 156/156 co-relation queries the response was YES. [2023-08-27 09:47:51,606 INFO L83 FinitePrefix]: Finished finitePrefix Result has 509 conditions, 436 events. 55/436 cut-off events. For 156/156 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1394 event pairs, 0 based on Foata normal form. 0/362 useless extension candidates. Maximal degree in co-relation 442. Up to 20 conditions per place. [2023-08-27 09:47:51,606 INFO L82 GeneralOperation]: Start removeDead. Operand has 303 places, 330 transitions, 777 flow [2023-08-27 09:47:51,608 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 303 places, 330 transitions, 777 flow [2023-08-27 09:47:51,609 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:47:51,609 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 303 places, 330 transitions, 777 flow [2023-08-27 09:47:51,609 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 303 places, 330 transitions, 777 flow [2023-08-27 09:47:51,609 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 303 places, 330 transitions, 777 flow [2023-08-27 09:47:51,652 INFO L124 PetriNetUnfolderBase]: 55/436 cut-off events. [2023-08-27 09:47:51,652 INFO L125 PetriNetUnfolderBase]: For 156/156 co-relation queries the response was YES. [2023-08-27 09:47:51,656 INFO L83 FinitePrefix]: Finished finitePrefix Result has 509 conditions, 436 events. 55/436 cut-off events. For 156/156 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1394 event pairs, 0 based on Foata normal form. 0/362 useless extension candidates. Maximal degree in co-relation 442. Up to 20 conditions per place. [2023-08-27 09:47:51,668 INFO L119 LiptonReduction]: Number of co-enabled transitions 88506 [2023-08-27 09:47:56,654 INFO L134 LiptonReduction]: Checked pairs total: 90684 [2023-08-27 09:47:56,654 INFO L136 LiptonReduction]: Total number of compositions: 404 [2023-08-27 09:47:56,656 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-27 09:47:56,657 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:47:56,657 INFO L358 AbstractCegarLoop]: Starting to check reachability of 10 error locations. [2023-08-27 09:47:56,657 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:47:56,657 INFO L124 PetriNetUnfolderBase]: 0/6 cut-off events. [2023-08-27 09:47:56,657 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:47:56,657 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:47:56,658 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-27 09:47:56,658 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-27 09:47:56,658 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:47:56,658 INFO L85 PathProgramCache]: Analyzing trace with hash 185148534, now seen corresponding path program 1 times [2023-08-27 09:47:56,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:47:56,658 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453730383] [2023-08-27 09:47:56,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:47:56,658 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:47:56,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-27 09:47:56,683 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-27 09:47:56,683 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-27 09:47:56,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453730383] [2023-08-27 09:47:56,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453730383] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-27 09:47:56,684 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-27 09:47:56,684 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-27 09:47:56,684 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997096951] [2023-08-27 09:47:56,684 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-27 09:47:56,684 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-27 09:47:56,685 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-27 09:47:56,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-27 09:47:56,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-27 09:47:56,685 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 274 out of 734 [2023-08-27 09:47:56,686 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 46 transitions, 209 flow. Second operand has 2 states, 2 states have (on average 276.0) internal successors, (552), 2 states have internal predecessors, (552), 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) [2023-08-27 09:47:56,686 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-27 09:47:56,686 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 274 of 734 [2023-08-27 09:47:56,686 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-27 09:48:34,443 INFO L124 PetriNetUnfolderBase]: 314930/400221 cut-off events. [2023-08-27 09:48:34,443 INFO L125 PetriNetUnfolderBase]: For 609352/609352 co-relation queries the response was YES. [2023-08-27 09:48:35,397 INFO L83 FinitePrefix]: Finished finitePrefix Result has 926753 conditions, 400221 events. 314930/400221 cut-off events. For 609352/609352 co-relation queries the response was YES. Maximal size of possible extension queue 11911. Compared 2456037 event pairs, 314930 based on Foata normal form. 0/390380 useless extension candidates. Maximal degree in co-relation 282670. Up to 373979 conditions per place. [2023-08-27 09:48:35,623 INFO L140 encePairwiseOnDemand]: 722/734 looper letters, 0 selfloop transitions, 0 changer transitions 32/32 dead transitions. [2023-08-27 09:48:35,623 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 52 places, 32 transitions, 239 flow [2023-08-27 09:48:35,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-27 09:48:35,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-27 09:48:35,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 589 transitions. [2023-08-27 09:48:35,626 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.40122615803814715 [2023-08-27 09:48:35,626 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 589 transitions. [2023-08-27 09:48:35,626 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 589 transitions. [2023-08-27 09:48:35,626 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-27 09:48:35,626 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 589 transitions. [2023-08-27 09:48:35,635 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 294.5) internal successors, (589), 2 states have internal predecessors, (589), 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) [2023-08-27 09:48:35,642 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 734.0) internal successors, (2202), 3 states have internal predecessors, (2202), 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) [2023-08-27 09:48:35,642 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 734.0) internal successors, (2202), 3 states have internal predecessors, (2202), 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) [2023-08-27 09:48:35,642 INFO L175 Difference]: Start difference. First operand has 63 places, 46 transitions, 209 flow. Second operand 2 states and 589 transitions. [2023-08-27 09:48:35,643 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 52 places, 32 transitions, 239 flow [2023-08-27 09:48:36,291 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 52 places, 32 transitions, 167 flow, removed 36 selfloop flow, removed 0 redundant places. [2023-08-27 09:48:36,291 INFO L231 Difference]: Finished difference. Result has 52 places, 0 transitions, 0 flow [2023-08-27 09:48:36,292 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=734, PETRI_DIFFERENCE_MINUEND_FLOW=109, PETRI_DIFFERENCE_MINUEND_PLACES=51, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=32, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=32, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=0, PETRI_PLACES=52, PETRI_TRANSITIONS=0} [2023-08-27 09:48:36,292 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, -11 predicate places. [2023-08-27 09:48:36,292 INFO L495 AbstractCegarLoop]: Abstraction has has 52 places, 0 transitions, 0 flow [2023-08-27 09:48:36,293 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 276.0) internal successors, (552), 2 states have internal predecessors, (552), 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) [2023-08-27 09:48:36,293 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (9 of 10 remaining) [2023-08-27 09:48:36,293 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (8 of 10 remaining) [2023-08-27 09:48:36,293 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (7 of 10 remaining) [2023-08-27 09:48:36,293 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (6 of 10 remaining) [2023-08-27 09:48:36,293 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 10 remaining) [2023-08-27 09:48:36,293 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 10 remaining) [2023-08-27 09:48:36,293 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 10 remaining) [2023-08-27 09:48:36,293 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 10 remaining) [2023-08-27 09:48:36,293 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 10 remaining) [2023-08-27 09:48:36,293 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 10 remaining) [2023-08-27 09:48:36,293 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-27 09:48:36,293 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:48:36,294 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-27 09:48:36,309 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 303 places, 330 transitions, 777 flow [2023-08-27 09:48:36,356 INFO L124 PetriNetUnfolderBase]: 55/436 cut-off events. [2023-08-27 09:48:36,356 INFO L125 PetriNetUnfolderBase]: For 156/156 co-relation queries the response was YES. [2023-08-27 09:48:36,362 INFO L83 FinitePrefix]: Finished finitePrefix Result has 509 conditions, 436 events. 55/436 cut-off events. For 156/156 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1394 event pairs, 0 based on Foata normal form. 0/362 useless extension candidates. Maximal degree in co-relation 442. Up to 20 conditions per place. [2023-08-27 09:48:36,362 INFO L82 GeneralOperation]: Start removeDead. Operand has 303 places, 330 transitions, 777 flow [2023-08-27 09:48:36,375 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 303 places, 330 transitions, 777 flow [2023-08-27 09:48:36,375 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:48:36,375 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 303 places, 330 transitions, 777 flow [2023-08-27 09:48:36,375 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 303 places, 330 transitions, 777 flow [2023-08-27 09:48:36,376 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 303 places, 330 transitions, 777 flow [2023-08-27 09:48:36,418 INFO L124 PetriNetUnfolderBase]: 55/436 cut-off events. [2023-08-27 09:48:36,418 INFO L125 PetriNetUnfolderBase]: For 156/156 co-relation queries the response was YES. [2023-08-27 09:48:36,422 INFO L83 FinitePrefix]: Finished finitePrefix Result has 509 conditions, 436 events. 55/436 cut-off events. For 156/156 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1394 event pairs, 0 based on Foata normal form. 0/362 useless extension candidates. Maximal degree in co-relation 442. Up to 20 conditions per place. [2023-08-27 09:48:36,434 INFO L119 LiptonReduction]: Number of co-enabled transitions 88506 [2023-08-27 09:48:42,019 INFO L134 LiptonReduction]: Checked pairs total: 91466 [2023-08-27 09:48:42,020 INFO L136 LiptonReduction]: Total number of compositions: 405 [2023-08-27 09:48:42,020 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-27 09:48:42,021 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:48:42,021 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-27 09:48:42,026 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:48:42,026 INFO L124 PetriNetUnfolderBase]: 3/81 cut-off events. [2023-08-27 09:48:42,026 INFO L125 PetriNetUnfolderBase]: For 156/156 co-relation queries the response was YES. [2023-08-27 09:48:42,026 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:48:42,026 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-27 09:48:42,026 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-27 09:48:42,026 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:48:42,027 INFO L85 PathProgramCache]: Analyzing trace with hash 267042299, now seen corresponding path program 1 times [2023-08-27 09:48:42,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:48:42,027 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752311265] [2023-08-27 09:48:42,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:48:42,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:48:42,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:48:42,045 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-27 09:48:42,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-27 09:48:42,058 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-27 09:48:42,059 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-27 09:48:42,059 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-27 09:48:42,059 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-08-27 09:48:42,059 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-27 09:48:42,059 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-27 09:48:42,059 WARN L233 ceAbstractionStarter]: 9 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-27 09:48:42,059 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 10 thread instances. [2023-08-27 09:48:42,081 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-27 09:48:42,083 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 334 places, 364 transitions, 868 flow [2023-08-27 09:48:42,133 INFO L124 PetriNetUnfolderBase]: 61/482 cut-off events. [2023-08-27 09:48:42,134 INFO L125 PetriNetUnfolderBase]: For 210/210 co-relation queries the response was YES. [2023-08-27 09:48:42,139 INFO L83 FinitePrefix]: Finished finitePrefix Result has 568 conditions, 482 events. 61/482 cut-off events. For 210/210 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1567 event pairs, 0 based on Foata normal form. 0/400 useless extension candidates. Maximal degree in co-relation 500. Up to 22 conditions per place. [2023-08-27 09:48:42,139 INFO L82 GeneralOperation]: Start removeDead. Operand has 334 places, 364 transitions, 868 flow [2023-08-27 09:48:42,141 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 334 places, 364 transitions, 868 flow [2023-08-27 09:48:42,141 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-27 09:48:42,141 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 334 places, 364 transitions, 868 flow [2023-08-27 09:48:42,142 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 334 places, 364 transitions, 868 flow [2023-08-27 09:48:42,142 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 334 places, 364 transitions, 868 flow [2023-08-27 09:48:42,192 INFO L124 PetriNetUnfolderBase]: 61/482 cut-off events. [2023-08-27 09:48:42,193 INFO L125 PetriNetUnfolderBase]: For 210/210 co-relation queries the response was YES. [2023-08-27 09:48:42,197 INFO L83 FinitePrefix]: Finished finitePrefix Result has 568 conditions, 482 events. 61/482 cut-off events. For 210/210 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 1567 event pairs, 0 based on Foata normal form. 0/400 useless extension candidates. Maximal degree in co-relation 500. Up to 22 conditions per place. [2023-08-27 09:48:42,213 INFO L119 LiptonReduction]: Number of co-enabled transitions 109560 [2023-08-27 09:48:48,153 INFO L134 LiptonReduction]: Checked pairs total: 110703 [2023-08-27 09:48:48,153 INFO L136 LiptonReduction]: Total number of compositions: 444 [2023-08-27 09:48:48,155 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-27 09:48:48,155 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;@77cfeafb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-27 09:48:48,155 INFO L358 AbstractCegarLoop]: Starting to check reachability of 11 error locations. [2023-08-27 09:48:48,156 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-27 09:48:48,156 INFO L124 PetriNetUnfolderBase]: 0/5 cut-off events. [2023-08-27 09:48:48,156 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-27 09:48:48,156 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-27 09:48:48,156 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-27 09:48:48,156 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 7 more)] === [2023-08-27 09:48:48,156 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-27 09:48:48,156 INFO L85 PathProgramCache]: Analyzing trace with hash 223285994, now seen corresponding path program 1 times [2023-08-27 09:48:48,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-27 09:48:48,156 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677335356] [2023-08-27 09:48:48,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-27 09:48:48,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-27 09:48:48,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-27 09:48:48,167 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-27 09:48:48,167 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-27 09:48:48,167 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677335356] [2023-08-27 09:48:48,167 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [677335356] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-27 09:48:48,167 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-27 09:48:48,167 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-27 09:48:48,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369310572] [2023-08-27 09:48:48,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-27 09:48:48,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-27 09:48:48,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-27 09:48:48,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-27 09:48:48,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-27 09:48:48,169 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 302 out of 808 [2023-08-27 09:48:48,169 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 56 transitions, 252 flow. Second operand has 2 states, 2 states have (on average 304.0) internal successors, (608), 2 states have internal predecessors, (608), 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) [2023-08-27 09:48:48,169 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-27 09:48:48,170 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 302 of 808 [2023-08-27 09:48:48,170 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand