/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf --traceabstraction.order.of.the.error.locations.to.be.checked PROGRAM_FIRST -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -i ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_22-deref_read_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-24 12:40:15,343 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-24 12:40:15,434 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf [2023-08-24 12:40:15,440 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-24 12:40:15,440 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-24 12:40:15,471 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-24 12:40:15,471 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-24 12:40:15,472 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-24 12:40:15,472 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-24 12:40:15,475 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-24 12:40:15,476 INFO L153 SettingsManager]: * Use SBE=true [2023-08-24 12:40:15,476 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-24 12:40:15,476 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-24 12:40:15,477 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-24 12:40:15,477 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-24 12:40:15,478 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-24 12:40:15,478 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-24 12:40:15,478 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-24 12:40:15,478 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-24 12:40:15,478 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-24 12:40:15,478 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-24 12:40:15,479 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-24 12:40:15,479 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-24 12:40:15,480 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-24 12:40:15,480 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-24 12:40:15,480 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-24 12:40:15,481 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-24 12:40:15,481 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-24 12:40:15,481 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-24 12:40:15,481 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-24 12:40:15,482 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-24 12:40:15,482 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-24 12:40:15,482 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-24 12:40:15,483 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-24 12:40:15,483 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-24 12:40:15,483 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST [2023-08-24 12:40:15,798 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-24 12:40:15,817 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-24 12:40:15,819 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-24 12:40:15,820 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-24 12:40:15,821 INFO L274 PluginConnector]: CDTParser initialized [2023-08-24 12:40:15,822 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_22-deref_read_racefree.i [2023-08-24 12:40:17,049 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-24 12:40:17,328 INFO L384 CDTParser]: Found 1 translation units. [2023-08-24 12:40:17,329 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_22-deref_read_racefree.i [2023-08-24 12:40:17,343 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/335ba9732/248f9f9cf8f44916bce8a503c80806ab/FLAG7891d0847 [2023-08-24 12:40:17,359 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/335ba9732/248f9f9cf8f44916bce8a503c80806ab [2023-08-24 12:40:17,361 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-24 12:40:17,362 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-24 12:40:17,363 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-24 12:40:17,363 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-24 12:40:17,366 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-24 12:40:17,366 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,367 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c5f85d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17, skipping insertion in model container [2023-08-24 12:40:17,367 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,398 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-24 12:40:17,713 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_22-deref_read_racefree.i[30176,30189] [2023-08-24 12:40:17,730 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-24 12:40:17,745 INFO L201 MainTranslator]: Completed pre-run [2023-08-24 12:40:17,774 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-24 12:40:17,776 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-24 12:40:17,791 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_22-deref_read_racefree.i[30176,30189] [2023-08-24 12:40:17,805 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-24 12:40:17,847 INFO L206 MainTranslator]: Completed translation [2023-08-24 12:40:17,847 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17 WrapperNode [2023-08-24 12:40:17,848 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-24 12:40:17,849 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-24 12:40:17,849 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-24 12:40:17,849 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-24 12:40:17,855 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,880 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,905 INFO L138 Inliner]: procedures = 170, calls = 36, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 69 [2023-08-24 12:40:17,905 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-24 12:40:17,906 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-24 12:40:17,906 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-24 12:40:17,906 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-24 12:40:17,913 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,914 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,921 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,921 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,936 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,940 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,946 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,947 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,950 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-24 12:40:17,950 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-24 12:40:17,950 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-24 12:40:17,951 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-24 12:40:17,951 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17" (1/1) ... [2023-08-24 12:40:17,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-24 12:40:17,966 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:40:17,977 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-24 12:40:17,979 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-24 12:40:18,005 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-24 12:40:18,006 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-24 12:40:18,006 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-24 12:40:18,006 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-24 12:40:18,006 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-24 12:40:18,006 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-24 12:40:18,006 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-24 12:40:18,006 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-24 12:40:18,007 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-24 12:40:18,007 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-24 12:40:18,007 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-24 12:40:18,008 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-24 12:40:18,111 INFO L236 CfgBuilder]: Building ICFG [2023-08-24 12:40:18,113 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-24 12:40:18,260 INFO L277 CfgBuilder]: Performing block encoding [2023-08-24 12:40:18,266 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-24 12:40:18,266 INFO L302 CfgBuilder]: Removed 9 assume(true) statements. [2023-08-24 12:40:18,268 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.08 12:40:18 BoogieIcfgContainer [2023-08-24 12:40:18,268 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-24 12:40:18,269 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-24 12:40:18,269 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-24 12:40:18,271 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-24 12:40:18,272 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.08 12:40:17" (1/3) ... [2023-08-24 12:40:18,272 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2452f2e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.08 12:40:18, skipping insertion in model container [2023-08-24 12:40:18,272 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:40:17" (2/3) ... [2023-08-24 12:40:18,272 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2452f2e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.08 12:40:18, skipping insertion in model container [2023-08-24 12:40:18,273 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.08 12:40:18" (3/3) ... [2023-08-24 12:40:18,274 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_22-deref_read_racefree.i [2023-08-24 12:40:18,286 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-24 12:40:18,286 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-08-24 12:40:18,286 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-24 12:40:18,341 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-24 12:40:18,378 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 94 places, 101 transitions, 207 flow [2023-08-24 12:40:18,456 INFO L124 PetriNetUnfolderBase]: 14/133 cut-off events. [2023-08-24 12:40:18,457 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:40:18,462 INFO L83 FinitePrefix]: Finished finitePrefix Result has 138 conditions, 133 events. 14/133 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 291 event pairs, 0 based on Foata normal form. 0/115 useless extension candidates. Maximal degree in co-relation 69. Up to 4 conditions per place. [2023-08-24 12:40:18,463 INFO L82 GeneralOperation]: Start removeDead. Operand has 94 places, 101 transitions, 207 flow [2023-08-24 12:40:18,467 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 94 places, 101 transitions, 207 flow [2023-08-24 12:40:18,471 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:40:18,484 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 94 places, 101 transitions, 207 flow [2023-08-24 12:40:18,486 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 94 places, 101 transitions, 207 flow [2023-08-24 12:40:18,486 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 94 places, 101 transitions, 207 flow [2023-08-24 12:40:18,537 INFO L124 PetriNetUnfolderBase]: 14/133 cut-off events. [2023-08-24 12:40:18,537 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:40:18,538 INFO L83 FinitePrefix]: Finished finitePrefix Result has 138 conditions, 133 events. 14/133 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 291 event pairs, 0 based on Foata normal form. 0/115 useless extension candidates. Maximal degree in co-relation 69. Up to 4 conditions per place. [2023-08-24 12:40:18,539 INFO L119 LiptonReduction]: Number of co-enabled transitions 2432 [2023-08-24 12:40:21,232 INFO L134 LiptonReduction]: Checked pairs total: 4475 [2023-08-24 12:40:21,233 INFO L136 LiptonReduction]: Total number of compositions: 85 [2023-08-24 12:40:21,243 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:40:21,247 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;@21f96dc9, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:40:21,247 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:40:21,250 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:40:21,250 INFO L124 PetriNetUnfolderBase]: 0/8 cut-off events. [2023-08-24 12:40:21,250 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:40:21,250 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:40:21,250 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-24 12:40:21,251 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:40:21,255 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:40:21,255 INFO L85 PathProgramCache]: Analyzing trace with hash 12084157, now seen corresponding path program 1 times [2023-08-24 12:40:21,261 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:40:21,261 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345294841] [2023-08-24 12:40:21,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:21,262 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:40:21,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:40:21,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:21,454 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:40:21,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345294841] [2023-08-24 12:40:21,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [345294841] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:40:21,456 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:40:21,456 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:40:21,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724410099] [2023-08-24 12:40:21,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:40:21,464 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:40:21,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:40:21,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:40:21,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:40:21,488 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 81 out of 186 [2023-08-24 12:40:21,490 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 25 places, 30 transitions, 65 flow. Second operand has 3 states, 3 states have (on average 82.33333333333333) internal successors, (247), 3 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:21,490 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:40:21,490 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 81 of 186 [2023-08-24 12:40:21,491 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:40:21,573 INFO L124 PetriNetUnfolderBase]: 72/176 cut-off events. [2023-08-24 12:40:21,574 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:40:21,575 INFO L83 FinitePrefix]: Finished finitePrefix Result has 355 conditions, 176 events. 72/176 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 730 event pairs, 0 based on Foata normal form. 18/174 useless extension candidates. Maximal degree in co-relation 324. Up to 153 conditions per place. [2023-08-24 12:40:21,577 INFO L140 encePairwiseOnDemand]: 175/186 looper letters, 23 selfloop transitions, 2 changer transitions 5/32 dead transitions. [2023-08-24 12:40:21,577 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 27 places, 32 transitions, 127 flow [2023-08-24 12:40:21,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:40:21,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:40:21,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 287 transitions. [2023-08-24 12:40:21,596 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.514336917562724 [2023-08-24 12:40:21,597 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 287 transitions. [2023-08-24 12:40:21,597 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 287 transitions. [2023-08-24 12:40:21,600 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:40:21,603 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 287 transitions. [2023-08-24 12:40:21,607 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 95.66666666666667) internal successors, (287), 3 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:21,611 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 186.0) internal successors, (744), 4 states have internal predecessors, (744), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:21,611 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 186.0) internal successors, (744), 4 states have internal predecessors, (744), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:21,613 INFO L175 Difference]: Start difference. First operand has 25 places, 30 transitions, 65 flow. Second operand 3 states and 287 transitions. [2023-08-24 12:40:21,614 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 27 places, 32 transitions, 127 flow [2023-08-24 12:40:21,617 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 32 transitions, 127 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-24 12:40:21,618 INFO L231 Difference]: Finished difference. Result has 28 places, 18 transitions, 47 flow [2023-08-24 12:40:21,619 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=186, PETRI_DIFFERENCE_MINUEND_FLOW=49, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=22, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=47, PETRI_PLACES=28, PETRI_TRANSITIONS=18} [2023-08-24 12:40:21,624 INFO L281 CegarLoopForPetriNet]: 25 programPoint places, 3 predicate places. [2023-08-24 12:40:21,624 INFO L495 AbstractCegarLoop]: Abstraction has has 28 places, 18 transitions, 47 flow [2023-08-24 12:40:21,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 82.33333333333333) internal successors, (247), 3 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:21,625 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:40:21,625 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:40:21,625 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-24 12:40:21,625 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:40:21,626 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:40:21,626 INFO L85 PathProgramCache]: Analyzing trace with hash -1156696903, now seen corresponding path program 1 times [2023-08-24 12:40:21,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:40:21,627 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398582305] [2023-08-24 12:40:21,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:21,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:40:21,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:40:21,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:21,768 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:40:21,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398582305] [2023-08-24 12:40:21,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1398582305] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:40:21,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [942634304] [2023-08-24 12:40:21,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:21,770 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:40:21,770 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:40:21,772 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-24 12:40:21,799 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-24 12:40:21,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:40:21,857 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-24 12:40:21,861 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:40:21,909 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:21,909 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:40:21,928 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:21,928 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [942634304] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:40:21,928 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:40:21,929 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-24 12:40:21,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925788927] [2023-08-24 12:40:21,929 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:40:21,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-24 12:40:21,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:40:21,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-24 12:40:21,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-24 12:40:21,932 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 81 out of 186 [2023-08-24 12:40:21,933 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 28 places, 18 transitions, 47 flow. Second operand has 7 states, 7 states have (on average 83.28571428571429) internal successors, (583), 7 states have internal predecessors, (583), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:21,933 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:40:21,933 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 81 of 186 [2023-08-24 12:40:21,933 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:40:21,972 INFO L124 PetriNetUnfolderBase]: 18/52 cut-off events. [2023-08-24 12:40:21,972 INFO L125 PetriNetUnfolderBase]: For 9/9 co-relation queries the response was YES. [2023-08-24 12:40:21,972 INFO L83 FinitePrefix]: Finished finitePrefix Result has 130 conditions, 52 events. 18/52 cut-off events. For 9/9 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 103 event pairs, 0 based on Foata normal form. 10/62 useless extension candidates. Maximal degree in co-relation 116. Up to 38 conditions per place. [2023-08-24 12:40:21,973 INFO L140 encePairwiseOnDemand]: 183/186 looper letters, 0 selfloop transitions, 0 changer transitions 25/25 dead transitions. [2023-08-24 12:40:21,973 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 24 places, 25 transitions, 105 flow [2023-08-24 12:40:21,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-24 12:40:21,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-24 12:40:21,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 348 transitions. [2023-08-24 12:40:21,975 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46774193548387094 [2023-08-24 12:40:21,975 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 348 transitions. [2023-08-24 12:40:21,975 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 348 transitions. [2023-08-24 12:40:21,975 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:40:21,975 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 348 transitions. [2023-08-24 12:40:21,976 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 87.0) internal successors, (348), 4 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:21,978 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 186.0) internal successors, (930), 5 states have internal predecessors, (930), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:21,979 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 186.0) internal successors, (930), 5 states have internal predecessors, (930), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:21,981 INFO L175 Difference]: Start difference. First operand has 28 places, 18 transitions, 47 flow. Second operand 4 states and 348 transitions. [2023-08-24 12:40:21,981 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 24 places, 25 transitions, 105 flow [2023-08-24 12:40:21,986 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 25 transitions, 99 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-24 12:40:21,987 INFO L231 Difference]: Finished difference. Result has 21 places, 0 transitions, 0 flow [2023-08-24 12:40:21,987 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=186, PETRI_DIFFERENCE_MINUEND_FLOW=33, PETRI_DIFFERENCE_MINUEND_PLACES=18, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=15, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=21, PETRI_TRANSITIONS=0} [2023-08-24 12:40:21,988 INFO L281 CegarLoopForPetriNet]: 25 programPoint places, -4 predicate places. [2023-08-24 12:40:21,988 INFO L495 AbstractCegarLoop]: Abstraction has has 21 places, 0 transitions, 0 flow [2023-08-24 12:40:21,989 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 83.28571428571429) internal successors, (583), 7 states have internal predecessors, (583), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:21,991 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-24 12:40:22,002 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-08-24 12:40:22,197 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:40:22,197 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-24 12:40:22,199 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-24 12:40:22,203 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 94 places, 101 transitions, 207 flow [2023-08-24 12:40:22,217 INFO L124 PetriNetUnfolderBase]: 14/133 cut-off events. [2023-08-24 12:40:22,217 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:40:22,219 INFO L83 FinitePrefix]: Finished finitePrefix Result has 138 conditions, 133 events. 14/133 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 291 event pairs, 0 based on Foata normal form. 0/115 useless extension candidates. Maximal degree in co-relation 69. Up to 4 conditions per place. [2023-08-24 12:40:22,219 INFO L82 GeneralOperation]: Start removeDead. Operand has 94 places, 101 transitions, 207 flow [2023-08-24 12:40:22,220 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 94 places, 101 transitions, 207 flow [2023-08-24 12:40:22,221 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:40:22,221 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 94 places, 101 transitions, 207 flow [2023-08-24 12:40:22,221 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 94 places, 101 transitions, 207 flow [2023-08-24 12:40:22,221 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 94 places, 101 transitions, 207 flow [2023-08-24 12:40:22,233 INFO L124 PetriNetUnfolderBase]: 14/133 cut-off events. [2023-08-24 12:40:22,233 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:40:22,236 INFO L83 FinitePrefix]: Finished finitePrefix Result has 138 conditions, 133 events. 14/133 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 291 event pairs, 0 based on Foata normal form. 0/115 useless extension candidates. Maximal degree in co-relation 69. Up to 4 conditions per place. [2023-08-24 12:40:22,238 INFO L119 LiptonReduction]: Number of co-enabled transitions 2432 [2023-08-24 12:40:24,650 INFO L134 LiptonReduction]: Checked pairs total: 4462 [2023-08-24 12:40:24,651 INFO L136 LiptonReduction]: Total number of compositions: 86 [2023-08-24 12:40:24,653 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-24 12:40:24,654 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;@21f96dc9, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:40:24,654 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:40:24,657 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:40:24,657 INFO L124 PetriNetUnfolderBase]: 2/19 cut-off events. [2023-08-24 12:40:24,657 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:40:24,657 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:40:24,657 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-24 12:40:24,657 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-24 12:40:24,658 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:40:24,658 INFO L85 PathProgramCache]: Analyzing trace with hash 1257376850, now seen corresponding path program 1 times [2023-08-24 12:40:24,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:40:24,658 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300814761] [2023-08-24 12:40:24,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:24,658 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:40:24,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:40:24,679 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-24 12:40:24,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:40:24,708 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-24 12:40:24,709 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-24 12:40:24,709 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-24 12:40:24,709 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-08-24 12:40:24,709 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-24 12:40:24,710 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-24 12:40:24,710 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-24 12:40:24,711 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-24 12:40:24,726 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-24 12:40:24,728 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 123 places, 134 transitions, 280 flow [2023-08-24 12:40:24,748 INFO L124 PetriNetUnfolderBase]: 24/203 cut-off events. [2023-08-24 12:40:24,748 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-24 12:40:24,749 INFO L83 FinitePrefix]: Finished finitePrefix Result has 213 conditions, 203 events. 24/203 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 566 event pairs, 0 based on Foata normal form. 0/173 useless extension candidates. Maximal degree in co-relation 134. Up to 6 conditions per place. [2023-08-24 12:40:24,749 INFO L82 GeneralOperation]: Start removeDead. Operand has 123 places, 134 transitions, 280 flow [2023-08-24 12:40:24,751 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 123 places, 134 transitions, 280 flow [2023-08-24 12:40:24,751 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:40:24,751 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 123 places, 134 transitions, 280 flow [2023-08-24 12:40:24,751 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 123 places, 134 transitions, 280 flow [2023-08-24 12:40:24,751 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 123 places, 134 transitions, 280 flow [2023-08-24 12:40:24,770 INFO L124 PetriNetUnfolderBase]: 24/203 cut-off events. [2023-08-24 12:40:24,771 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-24 12:40:24,771 INFO L83 FinitePrefix]: Finished finitePrefix Result has 213 conditions, 203 events. 24/203 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 566 event pairs, 0 based on Foata normal form. 0/173 useless extension candidates. Maximal degree in co-relation 134. Up to 6 conditions per place. [2023-08-24 12:40:24,775 INFO L119 LiptonReduction]: Number of co-enabled transitions 6976 [2023-08-24 12:40:27,215 INFO L134 LiptonReduction]: Checked pairs total: 14001 [2023-08-24 12:40:27,215 INFO L136 LiptonReduction]: Total number of compositions: 105 [2023-08-24 12:40:27,221 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:40:27,223 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;@21f96dc9, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:40:27,223 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:40:27,225 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:40:27,225 INFO L124 PetriNetUnfolderBase]: 0/8 cut-off events. [2023-08-24 12:40:27,225 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:40:27,225 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:40:27,225 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-24 12:40:27,225 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:40:27,225 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:40:27,226 INFO L85 PathProgramCache]: Analyzing trace with hash 23106034, now seen corresponding path program 1 times [2023-08-24 12:40:27,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:40:27,226 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048024693] [2023-08-24 12:40:27,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:27,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:40:27,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:40:27,283 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:27,284 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:40:27,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048024693] [2023-08-24 12:40:27,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048024693] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:40:27,285 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:40:27,285 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:40:27,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32958352] [2023-08-24 12:40:27,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:40:27,285 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:40:27,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:40:27,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:40:27,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:40:27,286 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 107 out of 239 [2023-08-24 12:40:27,287 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 40 places, 49 transitions, 110 flow. Second operand has 3 states, 3 states have (on average 108.33333333333333) internal successors, (325), 3 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:27,287 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:40:27,287 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 107 of 239 [2023-08-24 12:40:27,287 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:40:27,578 INFO L124 PetriNetUnfolderBase]: 1441/2596 cut-off events. [2023-08-24 12:40:27,579 INFO L125 PetriNetUnfolderBase]: For 20/20 co-relation queries the response was YES. [2023-08-24 12:40:27,582 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4995 conditions, 2596 events. 1441/2596 cut-off events. For 20/20 co-relation queries the response was YES. Maximal size of possible extension queue 99. Compared 14928 event pairs, 640 based on Foata normal form. 360/2736 useless extension candidates. Maximal degree in co-relation 476. Up to 2332 conditions per place. [2023-08-24 12:40:27,589 INFO L140 encePairwiseOnDemand]: 222/239 looper letters, 34 selfloop transitions, 2 changer transitions 4/46 dead transitions. [2023-08-24 12:40:27,589 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 42 places, 46 transitions, 182 flow [2023-08-24 12:40:27,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:40:27,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:40:27,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 381 transitions. [2023-08-24 12:40:27,591 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5313807531380753 [2023-08-24 12:40:27,591 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 381 transitions. [2023-08-24 12:40:27,591 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 381 transitions. [2023-08-24 12:40:27,591 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:40:27,591 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 381 transitions. [2023-08-24 12:40:27,594 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 127.0) internal successors, (381), 3 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:27,597 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 239.0) internal successors, (956), 4 states have internal predecessors, (956), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:27,597 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 239.0) internal successors, (956), 4 states have internal predecessors, (956), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:27,597 INFO L175 Difference]: Start difference. First operand has 40 places, 49 transitions, 110 flow. Second operand 3 states and 381 transitions. [2023-08-24 12:40:27,597 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 42 places, 46 transitions, 182 flow [2023-08-24 12:40:27,598 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 42 places, 46 transitions, 180 flow, removed 1 selfloop flow, removed 0 redundant places. [2023-08-24 12:40:27,600 INFO L231 Difference]: Finished difference. Result has 43 places, 32 transitions, 82 flow [2023-08-24 12:40:27,600 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=239, PETRI_DIFFERENCE_MINUEND_FLOW=80, PETRI_DIFFERENCE_MINUEND_PLACES=40, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=35, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=33, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=82, PETRI_PLACES=43, PETRI_TRANSITIONS=32} [2023-08-24 12:40:27,602 INFO L281 CegarLoopForPetriNet]: 40 programPoint places, 3 predicate places. [2023-08-24 12:40:27,605 INFO L495 AbstractCegarLoop]: Abstraction has has 43 places, 32 transitions, 82 flow [2023-08-24 12:40:27,605 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 108.33333333333333) internal successors, (325), 3 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:27,606 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:40:27,606 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:40:27,607 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-24 12:40:27,608 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:40:27,608 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:40:27,608 INFO L85 PathProgramCache]: Analyzing trace with hash 1482377078, now seen corresponding path program 1 times [2023-08-24 12:40:27,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:40:27,611 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644952467] [2023-08-24 12:40:27,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:27,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:40:27,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:40:27,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:27,684 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:40:27,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644952467] [2023-08-24 12:40:27,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1644952467] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:40:27,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404925758] [2023-08-24 12:40:27,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:27,685 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:40:27,685 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:40:27,688 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-24 12:40:27,689 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-24 12:40:27,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:40:27,783 INFO L262 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-24 12:40:27,783 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:40:27,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:27,796 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:40:27,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:27,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1404925758] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:40:27,819 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:40:27,819 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-24 12:40:27,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506042035] [2023-08-24 12:40:27,819 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:40:27,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-24 12:40:27,820 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:40:27,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-24 12:40:27,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-24 12:40:27,821 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 107 out of 239 [2023-08-24 12:40:27,822 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 43 places, 32 transitions, 82 flow. Second operand has 7 states, 7 states have (on average 109.28571428571429) internal successors, (765), 7 states have internal predecessors, (765), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:27,822 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:40:27,822 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 107 of 239 [2023-08-24 12:40:27,822 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:40:27,930 INFO L124 PetriNetUnfolderBase]: 421/766 cut-off events. [2023-08-24 12:40:27,930 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-24 12:40:27,931 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1638 conditions, 766 events. 421/766 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 35. Compared 3526 event pairs, 0 based on Foata normal form. 100/866 useless extension candidates. Maximal degree in co-relation 164. Up to 502 conditions per place. [2023-08-24 12:40:27,932 INFO L140 encePairwiseOnDemand]: 236/239 looper letters, 0 selfloop transitions, 0 changer transitions 57/57 dead transitions. [2023-08-24 12:40:27,932 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 57 transitions, 232 flow [2023-08-24 12:40:27,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-24 12:40:27,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-24 12:40:27,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 588 transitions. [2023-08-24 12:40:27,934 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4920502092050209 [2023-08-24 12:40:27,934 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 588 transitions. [2023-08-24 12:40:27,934 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 588 transitions. [2023-08-24 12:40:27,934 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:40:27,934 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 588 transitions. [2023-08-24 12:40:27,936 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 117.6) internal successors, (588), 5 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) [2023-08-24 12:40:27,938 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 239.0) internal successors, (1434), 6 states have internal predecessors, (1434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:27,938 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 239.0) internal successors, (1434), 6 states have internal predecessors, (1434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:27,939 INFO L175 Difference]: Start difference. First operand has 43 places, 32 transitions, 82 flow. Second operand 5 states and 588 transitions. [2023-08-24 12:40:27,939 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 57 transitions, 232 flow [2023-08-24 12:40:27,939 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 57 transitions, 230 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-24 12:40:27,940 INFO L231 Difference]: Finished difference. Result has 39 places, 0 transitions, 0 flow [2023-08-24 12:40:27,940 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=239, PETRI_DIFFERENCE_MINUEND_FLOW=72, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=39, PETRI_TRANSITIONS=0} [2023-08-24 12:40:27,941 INFO L281 CegarLoopForPetriNet]: 40 programPoint places, -1 predicate places. [2023-08-24 12:40:27,941 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 0 transitions, 0 flow [2023-08-24 12:40:27,941 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 109.28571428571429) internal successors, (765), 7 states have internal predecessors, (765), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:27,942 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-24 12:40:27,953 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-24 12:40:28,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:40:28,151 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-24 12:40:28,152 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-24 12:40:28,154 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 123 places, 134 transitions, 280 flow [2023-08-24 12:40:28,168 INFO L124 PetriNetUnfolderBase]: 24/203 cut-off events. [2023-08-24 12:40:28,169 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-24 12:40:28,170 INFO L83 FinitePrefix]: Finished finitePrefix Result has 213 conditions, 203 events. 24/203 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 566 event pairs, 0 based on Foata normal form. 0/173 useless extension candidates. Maximal degree in co-relation 134. Up to 6 conditions per place. [2023-08-24 12:40:28,170 INFO L82 GeneralOperation]: Start removeDead. Operand has 123 places, 134 transitions, 280 flow [2023-08-24 12:40:28,171 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 123 places, 134 transitions, 280 flow [2023-08-24 12:40:28,171 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:40:28,171 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 123 places, 134 transitions, 280 flow [2023-08-24 12:40:28,171 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 123 places, 134 transitions, 280 flow [2023-08-24 12:40:28,171 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 123 places, 134 transitions, 280 flow [2023-08-24 12:40:28,185 INFO L124 PetriNetUnfolderBase]: 24/203 cut-off events. [2023-08-24 12:40:28,185 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-24 12:40:28,186 INFO L83 FinitePrefix]: Finished finitePrefix Result has 213 conditions, 203 events. 24/203 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 566 event pairs, 0 based on Foata normal form. 0/173 useless extension candidates. Maximal degree in co-relation 134. Up to 6 conditions per place. [2023-08-24 12:40:28,189 INFO L119 LiptonReduction]: Number of co-enabled transitions 6976 [2023-08-24 12:40:30,628 INFO L134 LiptonReduction]: Checked pairs total: 13995 [2023-08-24 12:40:30,628 INFO L136 LiptonReduction]: Total number of compositions: 103 [2023-08-24 12:40:30,629 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-24 12:40:30,630 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;@21f96dc9, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:40:30,630 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:40:30,634 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:40:30,634 INFO L124 PetriNetUnfolderBase]: 12/53 cut-off events. [2023-08-24 12:40:30,634 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-24 12:40:30,634 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:40:30,634 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-24 12:40:30,634 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-24 12:40:30,634 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:40:30,634 INFO L85 PathProgramCache]: Analyzing trace with hash -1939973289, now seen corresponding path program 1 times [2023-08-24 12:40:30,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:40:30,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [581711171] [2023-08-24 12:40:30,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:30,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:40:30,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:40:30,663 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-24 12:40:30,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:40:30,683 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-24 12:40:30,683 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-24 12:40:30,683 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-24 12:40:30,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-24 12:40:30,683 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-24 12:40:30,684 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-24 12:40:30,684 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-24 12:40:30,684 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-24 12:40:30,705 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-24 12:40:30,707 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 152 places, 167 transitions, 355 flow [2023-08-24 12:40:30,732 INFO L124 PetriNetUnfolderBase]: 34/273 cut-off events. [2023-08-24 12:40:30,732 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-24 12:40:30,734 INFO L83 FinitePrefix]: Finished finitePrefix Result has 289 conditions, 273 events. 34/273 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 825 event pairs, 0 based on Foata normal form. 0/231 useless extension candidates. Maximal degree in co-relation 207. Up to 8 conditions per place. [2023-08-24 12:40:30,734 INFO L82 GeneralOperation]: Start removeDead. Operand has 152 places, 167 transitions, 355 flow [2023-08-24 12:40:30,737 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 152 places, 167 transitions, 355 flow [2023-08-24 12:40:30,737 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:40:30,737 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 152 places, 167 transitions, 355 flow [2023-08-24 12:40:30,737 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 152 places, 167 transitions, 355 flow [2023-08-24 12:40:30,738 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 152 places, 167 transitions, 355 flow [2023-08-24 12:40:30,758 INFO L124 PetriNetUnfolderBase]: 34/273 cut-off events. [2023-08-24 12:40:30,758 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-24 12:40:30,760 INFO L83 FinitePrefix]: Finished finitePrefix Result has 289 conditions, 273 events. 34/273 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 825 event pairs, 0 based on Foata normal form. 0/231 useless extension candidates. Maximal degree in co-relation 207. Up to 8 conditions per place. [2023-08-24 12:40:30,768 INFO L119 LiptonReduction]: Number of co-enabled transitions 13632 [2023-08-24 12:40:33,210 INFO L134 LiptonReduction]: Checked pairs total: 28772 [2023-08-24 12:40:33,210 INFO L136 LiptonReduction]: Total number of compositions: 122 [2023-08-24 12:40:33,212 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:40:33,212 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;@21f96dc9, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:40:33,212 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:40:33,214 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:40:33,214 INFO L124 PetriNetUnfolderBase]: 0/8 cut-off events. [2023-08-24 12:40:33,214 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:40:33,214 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:40:33,214 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-24 12:40:33,214 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:40:33,214 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:40:33,214 INFO L85 PathProgramCache]: Analyzing trace with hash 36186787, now seen corresponding path program 1 times [2023-08-24 12:40:33,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:40:33,215 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964050799] [2023-08-24 12:40:33,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:33,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:40:33,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:40:33,249 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:33,250 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:40:33,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964050799] [2023-08-24 12:40:33,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [964050799] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:40:33,250 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:40:33,250 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:40:33,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507444292] [2023-08-24 12:40:33,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:40:33,251 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:40:33,251 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:40:33,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:40:33,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:40:33,252 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 133 out of 289 [2023-08-24 12:40:33,252 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 67 transitions, 155 flow. Second operand has 3 states, 3 states have (on average 134.33333333333334) internal successors, (403), 3 states have internal predecessors, (403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:33,252 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:40:33,253 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 133 of 289 [2023-08-24 12:40:33,253 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:40:35,488 INFO L124 PetriNetUnfolderBase]: 20233/30247 cut-off events. [2023-08-24 12:40:35,488 INFO L125 PetriNetUnfolderBase]: For 603/603 co-relation queries the response was YES. [2023-08-24 12:40:35,539 INFO L83 FinitePrefix]: Finished finitePrefix Result has 59138 conditions, 30247 events. 20233/30247 cut-off events. For 603/603 co-relation queries the response was YES. Maximal size of possible extension queue 846. Compared 203353 event pairs, 12969 based on Foata normal form. 5058/33234 useless extension candidates. Maximal degree in co-relation 4954. Up to 28406 conditions per place. [2023-08-24 12:40:35,628 INFO L140 encePairwiseOnDemand]: 266/289 looper letters, 42 selfloop transitions, 2 changer transitions 4/57 dead transitions. [2023-08-24 12:40:35,628 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 56 places, 57 transitions, 229 flow [2023-08-24 12:40:35,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:40:35,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:40:35,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 473 transitions. [2023-08-24 12:40:35,630 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5455594002306805 [2023-08-24 12:40:35,630 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 473 transitions. [2023-08-24 12:40:35,630 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 473 transitions. [2023-08-24 12:40:35,630 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:40:35,630 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 473 transitions. [2023-08-24 12:40:35,631 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 157.66666666666666) internal successors, (473), 3 states have internal predecessors, (473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:35,634 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 289.0) internal successors, (1156), 4 states have internal predecessors, (1156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:35,635 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 289.0) internal successors, (1156), 4 states have internal predecessors, (1156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:35,635 INFO L175 Difference]: Start difference. First operand has 54 places, 67 transitions, 155 flow. Second operand 3 states and 473 transitions. [2023-08-24 12:40:35,636 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 56 places, 57 transitions, 229 flow [2023-08-24 12:40:35,638 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 56 places, 57 transitions, 223 flow, removed 3 selfloop flow, removed 0 redundant places. [2023-08-24 12:40:35,640 INFO L231 Difference]: Finished difference. Result has 57 places, 44 transitions, 111 flow [2023-08-24 12:40:35,640 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=289, PETRI_DIFFERENCE_MINUEND_FLOW=109, PETRI_DIFFERENCE_MINUEND_PLACES=54, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=47, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=45, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=111, PETRI_PLACES=57, PETRI_TRANSITIONS=44} [2023-08-24 12:40:35,641 INFO L281 CegarLoopForPetriNet]: 54 programPoint places, 3 predicate places. [2023-08-24 12:40:35,641 INFO L495 AbstractCegarLoop]: Abstraction has has 57 places, 44 transitions, 111 flow [2023-08-24 12:40:35,641 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 134.33333333333334) internal successors, (403), 3 states have internal predecessors, (403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:35,642 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:40:35,642 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:40:35,642 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-24 12:40:35,642 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:40:35,642 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:40:35,642 INFO L85 PathProgramCache]: Analyzing trace with hash 1943094232, now seen corresponding path program 1 times [2023-08-24 12:40:35,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:40:35,642 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345508316] [2023-08-24 12:40:35,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:35,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:40:35,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:40:35,687 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:35,687 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:40:35,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345508316] [2023-08-24 12:40:35,687 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345508316] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:40:35,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547863441] [2023-08-24 12:40:35,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:35,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:40:35,688 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:40:35,689 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-24 12:40:35,698 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-08-24 12:40:35,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:40:35,761 INFO L262 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-24 12:40:35,762 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:40:35,772 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:35,772 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:40:35,789 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:35,789 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547863441] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:40:35,789 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:40:35,789 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-24 12:40:35,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437876609] [2023-08-24 12:40:35,789 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:40:35,790 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-24 12:40:35,790 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:40:35,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-24 12:40:35,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-24 12:40:35,793 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 133 out of 289 [2023-08-24 12:40:35,796 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 57 places, 44 transitions, 111 flow. Second operand has 7 states, 7 states have (on average 135.28571428571428) internal successors, (947), 7 states have internal predecessors, (947), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:35,796 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:40:35,796 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 133 of 289 [2023-08-24 12:40:35,796 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:40:36,623 INFO L124 PetriNetUnfolderBase]: 6205/9325 cut-off events. [2023-08-24 12:40:36,623 INFO L125 PetriNetUnfolderBase]: For 1008/1008 co-relation queries the response was YES. [2023-08-24 12:40:36,638 INFO L83 FinitePrefix]: Finished finitePrefix Result has 19484 conditions, 9325 events. 6205/9325 cut-off events. For 1008/1008 co-relation queries the response was YES. Maximal size of possible extension queue 292. Compared 54958 event pairs, 0 based on Foata normal form. 909/10233 useless extension candidates. Maximal degree in co-relation 2226. Up to 5958 conditions per place. [2023-08-24 12:40:36,644 INFO L140 encePairwiseOnDemand]: 286/289 looper letters, 0 selfloop transitions, 0 changer transitions 95/95 dead transitions. [2023-08-24 12:40:36,644 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 95 transitions, 385 flow [2023-08-24 12:40:36,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-24 12:40:36,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-24 12:40:36,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 887 transitions. [2023-08-24 12:40:36,647 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5115340253748558 [2023-08-24 12:40:36,647 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 887 transitions. [2023-08-24 12:40:36,647 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 887 transitions. [2023-08-24 12:40:36,648 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:40:36,648 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 887 transitions. [2023-08-24 12:40:36,650 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 147.83333333333334) internal successors, (887), 6 states have internal predecessors, (887), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:36,652 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 289.0) internal successors, (2023), 7 states have internal predecessors, (2023), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:36,653 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 289.0) internal successors, (2023), 7 states have internal predecessors, (2023), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:36,653 INFO L175 Difference]: Start difference. First operand has 57 places, 44 transitions, 111 flow. Second operand 6 states and 887 transitions. [2023-08-24 12:40:36,653 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 95 transitions, 385 flow [2023-08-24 12:40:36,655 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 95 transitions, 383 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-24 12:40:36,655 INFO L231 Difference]: Finished difference. Result has 54 places, 0 transitions, 0 flow [2023-08-24 12:40:36,656 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=289, PETRI_DIFFERENCE_MINUEND_FLOW=101, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=41, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=54, PETRI_TRANSITIONS=0} [2023-08-24 12:40:36,657 INFO L281 CegarLoopForPetriNet]: 54 programPoint places, 0 predicate places. [2023-08-24 12:40:36,657 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 0 transitions, 0 flow [2023-08-24 12:40:36,658 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 135.28571428571428) internal successors, (947), 7 states have internal predecessors, (947), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:36,658 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-24 12:40:36,667 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-08-24 12:40:36,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:40:36,863 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-24 12:40:36,864 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-24 12:40:36,865 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 152 places, 167 transitions, 355 flow [2023-08-24 12:40:36,886 INFO L124 PetriNetUnfolderBase]: 34/273 cut-off events. [2023-08-24 12:40:36,887 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-24 12:40:36,889 INFO L83 FinitePrefix]: Finished finitePrefix Result has 289 conditions, 273 events. 34/273 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 825 event pairs, 0 based on Foata normal form. 0/231 useless extension candidates. Maximal degree in co-relation 207. Up to 8 conditions per place. [2023-08-24 12:40:36,889 INFO L82 GeneralOperation]: Start removeDead. Operand has 152 places, 167 transitions, 355 flow [2023-08-24 12:40:36,890 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 152 places, 167 transitions, 355 flow [2023-08-24 12:40:36,890 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:40:36,890 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 152 places, 167 transitions, 355 flow [2023-08-24 12:40:36,891 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 152 places, 167 transitions, 355 flow [2023-08-24 12:40:36,891 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 152 places, 167 transitions, 355 flow [2023-08-24 12:40:36,912 INFO L124 PetriNetUnfolderBase]: 34/273 cut-off events. [2023-08-24 12:40:36,912 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-24 12:40:36,914 INFO L83 FinitePrefix]: Finished finitePrefix Result has 289 conditions, 273 events. 34/273 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 825 event pairs, 0 based on Foata normal form. 0/231 useless extension candidates. Maximal degree in co-relation 207. Up to 8 conditions per place. [2023-08-24 12:40:36,923 INFO L119 LiptonReduction]: Number of co-enabled transitions 13632 [2023-08-24 12:40:39,474 INFO L134 LiptonReduction]: Checked pairs total: 28904 [2023-08-24 12:40:39,475 INFO L136 LiptonReduction]: Total number of compositions: 122 [2023-08-24 12:40:39,476 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-24 12:40:39,476 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;@21f96dc9, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:40:39,476 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:40:39,481 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:40:39,482 INFO L124 PetriNetUnfolderBase]: 18/78 cut-off events. [2023-08-24 12:40:39,482 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-24 12:40:39,482 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:40:39,482 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-24 12:40:39,482 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-24 12:40:39,482 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:40:39,482 INFO L85 PathProgramCache]: Analyzing trace with hash -1754049615, now seen corresponding path program 1 times [2023-08-24 12:40:39,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:40:39,483 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71089320] [2023-08-24 12:40:39,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:39,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:40:39,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:40:39,499 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-24 12:40:39,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:40:39,511 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-24 12:40:39,511 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-24 12:40:39,511 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-24 12:40:39,511 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-24 12:40:39,511 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-24 12:40:39,512 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-24 12:40:39,512 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-24 12:40:39,512 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-24 12:40:39,529 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-24 12:40:39,531 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 200 transitions, 432 flow [2023-08-24 12:40:39,567 INFO L124 PetriNetUnfolderBase]: 44/343 cut-off events. [2023-08-24 12:40:39,567 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-24 12:40:39,570 INFO L83 FinitePrefix]: Finished finitePrefix Result has 366 conditions, 343 events. 44/343 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 1096 event pairs, 0 based on Foata normal form. 0/289 useless extension candidates. Maximal degree in co-relation 281. Up to 10 conditions per place. [2023-08-24 12:40:39,570 INFO L82 GeneralOperation]: Start removeDead. Operand has 181 places, 200 transitions, 432 flow [2023-08-24 12:40:39,572 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 181 places, 200 transitions, 432 flow [2023-08-24 12:40:39,573 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:40:39,573 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 181 places, 200 transitions, 432 flow [2023-08-24 12:40:39,573 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 181 places, 200 transitions, 432 flow [2023-08-24 12:40:39,573 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 200 transitions, 432 flow [2023-08-24 12:40:39,608 INFO L124 PetriNetUnfolderBase]: 44/343 cut-off events. [2023-08-24 12:40:39,608 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-24 12:40:39,611 INFO L83 FinitePrefix]: Finished finitePrefix Result has 366 conditions, 343 events. 44/343 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 1096 event pairs, 0 based on Foata normal form. 0/289 useless extension candidates. Maximal degree in co-relation 281. Up to 10 conditions per place. [2023-08-24 12:40:39,619 INFO L119 LiptonReduction]: Number of co-enabled transitions 22400 [2023-08-24 12:40:42,357 INFO L134 LiptonReduction]: Checked pairs total: 51440 [2023-08-24 12:40:42,357 INFO L136 LiptonReduction]: Total number of compositions: 144 [2023-08-24 12:40:42,358 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:40:42,358 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;@21f96dc9, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:40:42,358 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:40:42,359 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:40:42,360 INFO L124 PetriNetUnfolderBase]: 0/8 cut-off events. [2023-08-24 12:40:42,360 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:40:42,360 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:40:42,360 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-24 12:40:42,360 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:40:42,360 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:40:42,360 INFO L85 PathProgramCache]: Analyzing trace with hash 51548714, now seen corresponding path program 1 times [2023-08-24 12:40:42,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:40:42,360 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331155382] [2023-08-24 12:40:42,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:40:42,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:40:42,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:40:42,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:40:42,381 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:40:42,382 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331155382] [2023-08-24 12:40:42,382 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331155382] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:40:42,382 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:40:42,382 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:40:42,382 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274737436] [2023-08-24 12:40:42,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:40:42,382 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:40:42,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:40:42,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:40:42,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:40:42,384 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 159 out of 344 [2023-08-24 12:40:42,384 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 68 places, 85 transitions, 202 flow. Second operand has 3 states, 3 states have (on average 160.33333333333334) internal successors, (481), 3 states have internal predecessors, (481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:40:42,384 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:40:42,384 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 159 of 344 [2023-08-24 12:40:42,385 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:41:18,429 INFO L124 PetriNetUnfolderBase]: 452675/588210 cut-off events. [2023-08-24 12:41:18,429 INFO L125 PetriNetUnfolderBase]: For 13880/13880 co-relation queries the response was YES. [2023-08-24 12:41:19,433 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1180015 conditions, 588210 events. 452675/588210 cut-off events. For 13880/13880 co-relation queries the response was YES. Maximal size of possible extension queue 10300. Compared 3871300 event pairs, 334100 based on Foata normal form. 61092/618842 useless extension candidates. Maximal degree in co-relation 94284. Up to 584426 conditions per place. [2023-08-24 12:41:20,715 INFO L140 encePairwiseOnDemand]: 315/344 looper letters, 58 selfloop transitions, 2 changer transitions 4/70 dead transitions. [2023-08-24 12:41:20,716 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 70 places, 70 transitions, 298 flow [2023-08-24 12:41:20,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:41:20,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:41:20,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 573 transitions. [2023-08-24 12:41:20,718 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5552325581395349 [2023-08-24 12:41:20,718 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 573 transitions. [2023-08-24 12:41:20,719 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 573 transitions. [2023-08-24 12:41:20,719 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:41:20,719 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 573 transitions. [2023-08-24 12:41:20,720 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 191.0) internal successors, (573), 3 states have internal predecessors, (573), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:20,722 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 344.0) internal successors, (1376), 4 states have internal predecessors, (1376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:20,722 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 344.0) internal successors, (1376), 4 states have internal predecessors, (1376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:20,722 INFO L175 Difference]: Start difference. First operand has 68 places, 85 transitions, 202 flow. Second operand 3 states and 573 transitions. [2023-08-24 12:41:20,722 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 70 places, 70 transitions, 298 flow [2023-08-24 12:41:20,734 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 70 places, 70 transitions, 286 flow, removed 6 selfloop flow, removed 0 redundant places. [2023-08-24 12:41:20,735 INFO L231 Difference]: Finished difference. Result has 71 places, 56 transitions, 140 flow [2023-08-24 12:41:20,735 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=344, PETRI_DIFFERENCE_MINUEND_FLOW=138, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=140, PETRI_PLACES=71, PETRI_TRANSITIONS=56} [2023-08-24 12:41:20,735 INFO L281 CegarLoopForPetriNet]: 68 programPoint places, 3 predicate places. [2023-08-24 12:41:20,736 INFO L495 AbstractCegarLoop]: Abstraction has has 71 places, 56 transitions, 140 flow [2023-08-24 12:41:20,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 160.33333333333334) internal successors, (481), 3 states have internal predecessors, (481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:20,736 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:41:20,736 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:41:20,736 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-24 12:41:20,736 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:41:20,737 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:41:20,737 INFO L85 PathProgramCache]: Analyzing trace with hash -112130265, now seen corresponding path program 1 times [2023-08-24 12:41:20,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:41:20,737 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131147289] [2023-08-24 12:41:20,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:41:20,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:41:20,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:41:20,779 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:41:20,780 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:41:20,780 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131147289] [2023-08-24 12:41:20,780 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131147289] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:41:20,780 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599928782] [2023-08-24 12:41:20,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:41:20,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:41:20,780 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:41:20,781 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-24 12:41:20,785 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-08-24 12:41:20,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:41:20,862 INFO L262 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-24 12:41:20,863 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:41:20,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:41:20,873 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:41:20,888 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:41:20,888 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599928782] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:41:20,888 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:41:20,888 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-24 12:41:20,888 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503729929] [2023-08-24 12:41:20,888 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:41:20,888 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-24 12:41:20,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:41:20,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-24 12:41:20,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-24 12:41:20,890 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 159 out of 344 [2023-08-24 12:41:20,891 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 71 places, 56 transitions, 140 flow. Second operand has 7 states, 7 states have (on average 161.28571428571428) internal successors, (1129), 7 states have internal predecessors, (1129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:20,891 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:41:20,891 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 159 of 344 [2023-08-24 12:41:20,892 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:41:41,616 INFO L124 PetriNetUnfolderBase]: 286856/374567 cut-off events. [2023-08-24 12:41:41,617 INFO L125 PetriNetUnfolderBase]: For 15992/15992 co-relation queries the response was YES. [2023-08-24 12:41:42,406 INFO L83 FinitePrefix]: Finished finitePrefix Result has 777236 conditions, 374567 events. 286856/374567 cut-off events. For 15992/15992 co-relation queries the response was YES. Maximal size of possible extension queue 6934. Compared 2470574 event pairs, 12196 based on Foata normal form. 1330/375897 useless extension candidates. Maximal degree in co-relation 697766. Up to 246357 conditions per place. [2023-08-24 12:41:43,354 INFO L140 encePairwiseOnDemand]: 340/344 looper letters, 146 selfloop transitions, 5 changer transitions 1/158 dead transitions. [2023-08-24 12:41:43,355 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 158 transitions, 652 flow [2023-08-24 12:41:43,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-24 12:41:43,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-24 12:41:43,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1109 transitions. [2023-08-24 12:41:43,359 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5373062015503876 [2023-08-24 12:41:43,359 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1109 transitions. [2023-08-24 12:41:43,359 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1109 transitions. [2023-08-24 12:41:43,360 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:41:43,360 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1109 transitions. [2023-08-24 12:41:43,362 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 184.83333333333334) internal successors, (1109), 6 states have internal predecessors, (1109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:43,364 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 344.0) internal successors, (2408), 7 states have internal predecessors, (2408), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:43,365 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 344.0) internal successors, (2408), 7 states have internal predecessors, (2408), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:43,365 INFO L175 Difference]: Start difference. First operand has 71 places, 56 transitions, 140 flow. Second operand 6 states and 1109 transitions. [2023-08-24 12:41:43,365 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 158 transitions, 652 flow [2023-08-24 12:41:43,368 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 71 places, 158 transitions, 650 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-24 12:41:43,370 INFO L231 Difference]: Finished difference. Result has 75 places, 58 transitions, 172 flow [2023-08-24 12:41:43,370 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=344, PETRI_DIFFERENCE_MINUEND_FLOW=138, PETRI_DIFFERENCE_MINUEND_PLACES=66, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=53, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=172, PETRI_PLACES=75, PETRI_TRANSITIONS=58} [2023-08-24 12:41:43,370 INFO L281 CegarLoopForPetriNet]: 68 programPoint places, 7 predicate places. [2023-08-24 12:41:43,370 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 58 transitions, 172 flow [2023-08-24 12:41:43,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 161.28571428571428) internal successors, (1129), 7 states have internal predecessors, (1129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:43,371 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:41:43,371 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:41:43,381 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-08-24 12:41:43,577 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:41:43,577 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:41:43,577 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:41:43,577 INFO L85 PathProgramCache]: Analyzing trace with hash -494144296, now seen corresponding path program 1 times [2023-08-24 12:41:43,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:41:43,577 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [680958480] [2023-08-24 12:41:43,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:41:43,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:41:43,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:41:43,662 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:41:43,662 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:41:43,662 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [680958480] [2023-08-24 12:41:43,662 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [680958480] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:41:43,662 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2112202371] [2023-08-24 12:41:43,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:41:43,662 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:41:43,662 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:41:43,663 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-24 12:41:43,666 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-08-24 12:41:43,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:41:43,760 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-24 12:41:43,761 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:41:43,796 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:41:43,796 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:41:43,856 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:41:43,856 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2112202371] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:41:43,856 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:41:43,856 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-24 12:41:43,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008957156] [2023-08-24 12:41:43,858 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:41:43,859 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-24 12:41:43,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:41:43,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-24 12:41:43,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-24 12:41:43,862 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 159 out of 344 [2023-08-24 12:41:43,863 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 58 transitions, 172 flow. Second operand has 13 states, 13 states have (on average 161.6153846153846) internal successors, (2101), 13 states have internal predecessors, (2101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:43,863 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:41:43,863 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 159 of 344 [2023-08-24 12:41:43,864 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:41:51,147 INFO L124 PetriNetUnfolderBase]: 93740/127015 cut-off events. [2023-08-24 12:41:51,147 INFO L125 PetriNetUnfolderBase]: For 102480/102480 co-relation queries the response was YES. [2023-08-24 12:41:51,473 INFO L83 FinitePrefix]: Finished finitePrefix Result has 300614 conditions, 127015 events. 93740/127015 cut-off events. For 102480/102480 co-relation queries the response was YES. Maximal size of possible extension queue 2754. Compared 807075 event pairs, 0 based on Foata normal form. 13310/140325 useless extension candidates. Maximal degree in co-relation 32467. Up to 61589 conditions per place. [2023-08-24 12:41:51,539 INFO L140 encePairwiseOnDemand]: 341/344 looper letters, 0 selfloop transitions, 0 changer transitions 154/154 dead transitions. [2023-08-24 12:41:51,540 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 154 transitions, 658 flow [2023-08-24 12:41:51,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-24 12:41:51,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-24 12:41:51,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1262 transitions. [2023-08-24 12:41:51,542 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5240863787375415 [2023-08-24 12:41:51,542 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1262 transitions. [2023-08-24 12:41:51,542 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1262 transitions. [2023-08-24 12:41:51,543 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:41:51,543 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1262 transitions. [2023-08-24 12:41:51,545 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 180.28571428571428) internal successors, (1262), 7 states have internal predecessors, (1262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:51,548 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 344.0) internal successors, (2752), 8 states have internal predecessors, (2752), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:51,549 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 344.0) internal successors, (2752), 8 states have internal predecessors, (2752), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:51,549 INFO L175 Difference]: Start difference. First operand has 75 places, 58 transitions, 172 flow. Second operand 7 states and 1262 transitions. [2023-08-24 12:41:51,549 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 154 transitions, 658 flow [2023-08-24 12:41:51,840 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 71 places, 154 transitions, 639 flow, removed 3 selfloop flow, removed 7 redundant places. [2023-08-24 12:41:51,841 INFO L231 Difference]: Finished difference. Result has 71 places, 0 transitions, 0 flow [2023-08-24 12:41:51,842 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=344, PETRI_DIFFERENCE_MINUEND_FLOW=139, PETRI_DIFFERENCE_MINUEND_PLACES=65, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=55, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=0, PETRI_PLACES=71, PETRI_TRANSITIONS=0} [2023-08-24 12:41:51,843 INFO L281 CegarLoopForPetriNet]: 68 programPoint places, 3 predicate places. [2023-08-24 12:41:51,843 INFO L495 AbstractCegarLoop]: Abstraction has has 71 places, 0 transitions, 0 flow [2023-08-24 12:41:51,844 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 161.6153846153846) internal successors, (2101), 13 states have internal predecessors, (2101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:51,844 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-24 12:41:51,850 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-08-24 12:41:52,049 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-08-24 12:41:52,049 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-24 12:41:52,050 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-24 12:41:52,051 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 200 transitions, 432 flow [2023-08-24 12:41:52,070 INFO L124 PetriNetUnfolderBase]: 44/343 cut-off events. [2023-08-24 12:41:52,070 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-24 12:41:52,072 INFO L83 FinitePrefix]: Finished finitePrefix Result has 366 conditions, 343 events. 44/343 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 1096 event pairs, 0 based on Foata normal form. 0/289 useless extension candidates. Maximal degree in co-relation 281. Up to 10 conditions per place. [2023-08-24 12:41:52,072 INFO L82 GeneralOperation]: Start removeDead. Operand has 181 places, 200 transitions, 432 flow [2023-08-24 12:41:52,073 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 181 places, 200 transitions, 432 flow [2023-08-24 12:41:52,073 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:41:52,073 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 181 places, 200 transitions, 432 flow [2023-08-24 12:41:52,073 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 181 places, 200 transitions, 432 flow [2023-08-24 12:41:52,073 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 200 transitions, 432 flow [2023-08-24 12:41:52,319 INFO L124 PetriNetUnfolderBase]: 44/343 cut-off events. [2023-08-24 12:41:52,320 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-24 12:41:52,323 INFO L83 FinitePrefix]: Finished finitePrefix Result has 366 conditions, 343 events. 44/343 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 1096 event pairs, 0 based on Foata normal form. 0/289 useless extension candidates. Maximal degree in co-relation 281. Up to 10 conditions per place. [2023-08-24 12:41:52,330 INFO L119 LiptonReduction]: Number of co-enabled transitions 22400 [2023-08-24 12:41:54,824 INFO L134 LiptonReduction]: Checked pairs total: 46190 [2023-08-24 12:41:54,824 INFO L136 LiptonReduction]: Total number of compositions: 145 [2023-08-24 12:41:54,825 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-24 12:41:54,826 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;@21f96dc9, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:41:54,826 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:41:54,831 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:41:54,831 INFO L124 PetriNetUnfolderBase]: 28/111 cut-off events. [2023-08-24 12:41:54,831 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-24 12:41:54,831 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:41:54,831 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-24 12:41:54,831 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-24 12:41:54,831 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:41:54,832 INFO L85 PathProgramCache]: Analyzing trace with hash -587578700, now seen corresponding path program 1 times [2023-08-24 12:41:54,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:41:54,832 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809464034] [2023-08-24 12:41:54,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:41:54,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:41:54,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:41:54,853 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-24 12:41:54,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:41:54,873 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-24 12:41:54,874 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-24 12:41:54,874 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-24 12:41:54,874 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-24 12:41:54,874 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-24 12:41:54,875 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-24 12:41:54,875 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-24 12:41:54,875 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-24 12:41:54,897 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-24 12:41:54,901 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 210 places, 233 transitions, 511 flow [2023-08-24 12:41:54,943 INFO L124 PetriNetUnfolderBase]: 54/413 cut-off events. [2023-08-24 12:41:54,943 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-24 12:41:54,947 INFO L83 FinitePrefix]: Finished finitePrefix Result has 444 conditions, 413 events. 54/413 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 1356 event pairs, 0 based on Foata normal form. 0/347 useless extension candidates. Maximal degree in co-relation 356. Up to 12 conditions per place. [2023-08-24 12:41:54,948 INFO L82 GeneralOperation]: Start removeDead. Operand has 210 places, 233 transitions, 511 flow [2023-08-24 12:41:54,950 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 210 places, 233 transitions, 511 flow [2023-08-24 12:41:54,950 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:41:54,950 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 210 places, 233 transitions, 511 flow [2023-08-24 12:41:54,950 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 210 places, 233 transitions, 511 flow [2023-08-24 12:41:54,950 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 210 places, 233 transitions, 511 flow [2023-08-24 12:41:54,986 INFO L124 PetriNetUnfolderBase]: 54/413 cut-off events. [2023-08-24 12:41:54,987 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-24 12:41:54,991 INFO L83 FinitePrefix]: Finished finitePrefix Result has 444 conditions, 413 events. 54/413 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 1356 event pairs, 0 based on Foata normal form. 0/347 useless extension candidates. Maximal degree in co-relation 356. Up to 12 conditions per place. [2023-08-24 12:41:55,001 INFO L119 LiptonReduction]: Number of co-enabled transitions 33280 [2023-08-24 12:41:57,570 INFO L134 LiptonReduction]: Checked pairs total: 74957 [2023-08-24 12:41:57,570 INFO L136 LiptonReduction]: Total number of compositions: 163 [2023-08-24 12:41:57,572 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:41:57,574 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;@21f96dc9, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:41:57,574 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:41:57,575 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:41:57,575 INFO L124 PetriNetUnfolderBase]: 0/8 cut-off events. [2023-08-24 12:41:57,575 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:41:57,575 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:41:57,575 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-24 12:41:57,576 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:41:57,576 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:41:57,576 INFO L85 PathProgramCache]: Analyzing trace with hash 69215876, now seen corresponding path program 1 times [2023-08-24 12:41:57,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:41:57,576 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862668244] [2023-08-24 12:41:57,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:41:57,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:41:57,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:41:57,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:41:57,599 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:41:57,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862668244] [2023-08-24 12:41:57,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [862668244] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:41:57,600 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:41:57,600 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:41:57,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842955359] [2023-08-24 12:41:57,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:41:57,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:41:57,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:41:57,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:41:57,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:41:57,601 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 185 out of 396 [2023-08-24 12:41:57,602 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 82 places, 103 transitions, 251 flow. Second operand has 3 states, 3 states have (on average 186.33333333333334) internal successors, (559), 3 states have internal predecessors, (559), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-24 12:41:57,602 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:41:57,602 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 185 of 396 [2023-08-24 12:41:57,602 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand