/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_06-cond_racing1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-24 12:36:04,921 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-24 12:36:04,992 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 12:36:04,998 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-24 12:36:04,999 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-24 12:36:05,024 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-24 12:36:05,024 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-24 12:36:05,025 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-24 12:36:05,025 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-24 12:36:05,028 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-24 12:36:05,028 INFO L153 SettingsManager]: * Use SBE=true [2023-08-24 12:36:05,029 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-24 12:36:05,029 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-24 12:36:05,030 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-24 12:36:05,030 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-24 12:36:05,030 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-24 12:36:05,030 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-24 12:36:05,030 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-24 12:36:05,031 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-24 12:36:05,031 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-24 12:36:05,031 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-24 12:36:05,031 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-24 12:36:05,032 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-24 12:36:05,032 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-24 12:36:05,032 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-24 12:36:05,032 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-24 12:36:05,032 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-24 12:36:05,033 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-24 12:36:05,033 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-24 12:36:05,033 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-24 12:36:05,034 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-24 12:36:05,034 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-24 12:36:05,034 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-24 12:36:05,034 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-24 12:36:05,034 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-24 12:36:05,034 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST [2023-08-24 12:36:05,322 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-24 12:36:05,337 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-24 12:36:05,339 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-24 12:36:05,340 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-24 12:36:05,340 INFO L274 PluginConnector]: CDTParser initialized [2023-08-24 12:36:05,341 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_06-cond_racing1.i [2023-08-24 12:36:06,344 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-24 12:36:06,595 INFO L384 CDTParser]: Found 1 translation units. [2023-08-24 12:36:06,595 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_06-cond_racing1.i [2023-08-24 12:36:06,613 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04b796918/10a36bc1274a4d44bdee77140ba64987/FLAGaaa2973c8 [2023-08-24 12:36:06,624 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04b796918/10a36bc1274a4d44bdee77140ba64987 [2023-08-24 12:36:06,626 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-24 12:36:06,627 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-24 12:36:06,628 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-24 12:36:06,628 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-24 12:36:06,630 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-24 12:36:06,630 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.08 12:36:06" (1/1) ... [2023-08-24 12:36:06,631 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@101a2103 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:06, skipping insertion in model container [2023-08-24 12:36:06,631 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.08 12:36:06" (1/1) ... [2023-08-24 12:36:06,676 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-24 12:36:07,012 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_06-cond_racing1.i[41322,41335] [2023-08-24 12:36:07,033 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-24 12:36:07,043 INFO L201 MainTranslator]: Completed pre-run [2023-08-24 12:36:07,055 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: unsigned short [119] [2023-08-24 12:36:07,072 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [481] [2023-08-24 12:36:07,072 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [481] [2023-08-24 12:36:07,085 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_06-cond_racing1.i[41322,41335] [2023-08-24 12:36:07,090 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-24 12:36:07,143 INFO L206 MainTranslator]: Completed translation [2023-08-24 12:36:07,144 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07 WrapperNode [2023-08-24 12:36:07,144 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-24 12:36:07,145 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-24 12:36:07,145 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-24 12:36:07,145 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-24 12:36:07,149 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07" (1/1) ... [2023-08-24 12:36:07,174 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07" (1/1) ... [2023-08-24 12:36:07,193 INFO L138 Inliner]: procedures = 270, calls = 36, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 91 [2023-08-24 12:36:07,194 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-24 12:36:07,194 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-24 12:36:07,194 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-24 12:36:07,194 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-24 12:36:07,200 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07" (1/1) ... [2023-08-24 12:36:07,200 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07" (1/1) ... [2023-08-24 12:36:07,213 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07" (1/1) ... [2023-08-24 12:36:07,213 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07" (1/1) ... [2023-08-24 12:36:07,216 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07" (1/1) ... [2023-08-24 12:36:07,224 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07" (1/1) ... [2023-08-24 12:36:07,225 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07" (1/1) ... [2023-08-24 12:36:07,226 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07" (1/1) ... [2023-08-24 12:36:07,227 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-24 12:36:07,228 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-24 12:36:07,228 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-24 12:36:07,228 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-24 12:36:07,233 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07" (1/1) ... [2023-08-24 12:36:07,237 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-24 12:36:07,244 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:36:07,252 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 12:36:07,258 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 12:36:07,286 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-24 12:36:07,286 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-24 12:36:07,286 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-24 12:36:07,287 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-24 12:36:07,287 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-24 12:36:07,287 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-24 12:36:07,287 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-24 12:36:07,287 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-24 12:36:07,287 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-24 12:36:07,287 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-24 12:36:07,287 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-24 12:36:07,289 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 12:36:07,370 INFO L236 CfgBuilder]: Building ICFG [2023-08-24 12:36:07,371 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-24 12:36:07,508 INFO L277 CfgBuilder]: Performing block encoding [2023-08-24 12:36:07,512 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-24 12:36:07,512 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-08-24 12:36:07,514 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.08 12:36:07 BoogieIcfgContainer [2023-08-24 12:36:07,514 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-24 12:36:07,515 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-24 12:36:07,515 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-24 12:36:07,517 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-24 12:36:07,517 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.08 12:36:06" (1/3) ... [2023-08-24 12:36:07,517 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d44676a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.08 12:36:07, skipping insertion in model container [2023-08-24 12:36:07,517 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.08 12:36:07" (2/3) ... [2023-08-24 12:36:07,518 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d44676a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.08 12:36:07, skipping insertion in model container [2023-08-24 12:36:07,518 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.08 12:36:07" (3/3) ... [2023-08-24 12:36:07,518 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_06-cond_racing1.i [2023-08-24 12:36:07,528 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-24 12:36:07,528 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-08-24 12:36:07,529 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-24 12:36:07,564 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-24 12:36:07,585 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 109 places, 121 transitions, 250 flow [2023-08-24 12:36:07,633 INFO L124 PetriNetUnfolderBase]: 23/165 cut-off events. [2023-08-24 12:36:07,633 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-24 12:36:07,638 INFO L83 FinitePrefix]: Finished finitePrefix Result has 171 conditions, 165 events. 23/165 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 370 event pairs, 0 based on Foata normal form. 0/137 useless extension candidates. Maximal degree in co-relation 81. Up to 6 conditions per place. [2023-08-24 12:36:07,638 INFO L82 GeneralOperation]: Start removeDead. Operand has 109 places, 121 transitions, 250 flow [2023-08-24 12:36:07,640 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 105 places, 116 transitions, 237 flow [2023-08-24 12:36:07,642 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:36:07,648 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 105 places, 116 transitions, 237 flow [2023-08-24 12:36:07,649 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 105 places, 116 transitions, 237 flow [2023-08-24 12:36:07,650 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 105 places, 116 transitions, 237 flow [2023-08-24 12:36:07,679 INFO L124 PetriNetUnfolderBase]: 22/160 cut-off events. [2023-08-24 12:36:07,679 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:36:07,680 INFO L83 FinitePrefix]: Finished finitePrefix Result has 165 conditions, 160 events. 22/160 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 358 event pairs, 0 based on Foata normal form. 0/132 useless extension candidates. Maximal degree in co-relation 81. Up to 6 conditions per place. [2023-08-24 12:36:07,692 INFO L119 LiptonReduction]: Number of co-enabled transitions 2800 [2023-08-24 12:36:10,131 INFO L134 LiptonReduction]: Checked pairs total: 4543 [2023-08-24 12:36:10,131 INFO L136 LiptonReduction]: Total number of compositions: 101 [2023-08-24 12:36:10,150 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:36:10,154 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;@2a858314, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:36:10,154 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:36:10,157 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:36:10,157 INFO L124 PetriNetUnfolderBase]: 2/14 cut-off events. [2023-08-24 12:36:10,157 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:36:10,157 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:36:10,158 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-24 12:36:10,158 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:36:10,161 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:36:10,161 INFO L85 PathProgramCache]: Analyzing trace with hash 14371435, now seen corresponding path program 1 times [2023-08-24 12:36:10,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:36:10,190 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570070653] [2023-08-24 12:36:10,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:10,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:36:10,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:36:10,357 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 12:36:10,358 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:36:10,358 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570070653] [2023-08-24 12:36:10,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570070653] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:36:10,359 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:36:10,359 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:36:10,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485934162] [2023-08-24 12:36:10,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:36:10,366 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:36:10,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:36:10,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:36:10,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:36:10,386 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 99 out of 222 [2023-08-24 12:36:10,388 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 34 transitions, 73 flow. Second operand has 3 states, 3 states have (on average 100.33333333333333) internal successors, (301), 3 states have internal predecessors, (301), 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 12:36:10,388 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:36:10,388 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 99 of 222 [2023-08-24 12:36:10,389 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:36:10,467 INFO L124 PetriNetUnfolderBase]: 105/227 cut-off events. [2023-08-24 12:36:10,467 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:36:10,468 INFO L83 FinitePrefix]: Finished finitePrefix Result has 458 conditions, 227 events. 105/227 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 820 event pairs, 77 based on Foata normal form. 22/204 useless extension candidates. Maximal degree in co-relation 443. Up to 214 conditions per place. [2023-08-24 12:36:10,469 INFO L140 encePairwiseOnDemand]: 209/222 looper letters, 21 selfloop transitions, 2 changer transitions 10/34 dead transitions. [2023-08-24 12:36:10,469 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 34 transitions, 137 flow [2023-08-24 12:36:10,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:36:10,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:36:10,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 346 transitions. [2023-08-24 12:36:10,480 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5195195195195195 [2023-08-24 12:36:10,480 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 346 transitions. [2023-08-24 12:36:10,481 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 346 transitions. [2023-08-24 12:36:10,482 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:36:10,483 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 346 transitions. [2023-08-24 12:36:10,486 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 115.33333333333333) internal successors, (346), 3 states have internal predecessors, (346), 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 12:36:10,489 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 222.0) internal successors, (888), 4 states have internal predecessors, (888), 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 12:36:10,490 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 222.0) internal successors, (888), 4 states have internal predecessors, (888), 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 12:36:10,491 INFO L175 Difference]: Start difference. First operand has 27 places, 34 transitions, 73 flow. Second operand 3 states and 346 transitions. [2023-08-24 12:36:10,492 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 34 transitions, 137 flow [2023-08-24 12:36:10,493 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 34 transitions, 137 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-24 12:36:10,494 INFO L231 Difference]: Finished difference. Result has 30 places, 16 transitions, 43 flow [2023-08-24 12:36:10,496 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=222, PETRI_DIFFERENCE_MINUEND_FLOW=55, PETRI_DIFFERENCE_MINUEND_PLACES=27, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=25, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=43, PETRI_PLACES=30, PETRI_TRANSITIONS=16} [2023-08-24 12:36:10,498 INFO L281 CegarLoopForPetriNet]: 27 programPoint places, 3 predicate places. [2023-08-24 12:36:10,498 INFO L495 AbstractCegarLoop]: Abstraction has has 30 places, 16 transitions, 43 flow [2023-08-24 12:36:10,499 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 100.33333333333333) internal successors, (301), 3 states have internal predecessors, (301), 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 12:36:10,499 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:36:10,499 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:36:10,499 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-24 12:36:10,499 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:36:10,500 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:36:10,500 INFO L85 PathProgramCache]: Analyzing trace with hash -1998965691, now seen corresponding path program 1 times [2023-08-24 12:36:10,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:36:10,500 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221722562] [2023-08-24 12:36:10,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:10,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:36:10,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:36:10,564 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 12:36:10,564 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:36:10,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221722562] [2023-08-24 12:36:10,565 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1221722562] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:36:10,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478571452] [2023-08-24 12:36:10,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:10,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:36:10,565 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:36:10,569 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 12:36:10,627 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 12:36:10,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:36:10,681 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-24 12:36:10,684 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:36:10,714 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 12:36:10,714 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:36:10,729 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 12:36:10,729 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478571452] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:36:10,730 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:36:10,730 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-24 12:36:10,730 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133469826] [2023-08-24 12:36:10,730 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:36:10,731 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-24 12:36:10,731 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:36:10,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-24 12:36:10,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-24 12:36:10,733 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 99 out of 222 [2023-08-24 12:36:10,733 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 16 transitions, 43 flow. Second operand has 7 states, 7 states have (on average 101.28571428571429) internal successors, (709), 7 states have internal predecessors, (709), 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 12:36:10,734 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:36:10,734 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 99 of 222 [2023-08-24 12:36:10,734 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:36:10,762 INFO L124 PetriNetUnfolderBase]: 16/46 cut-off events. [2023-08-24 12:36:10,762 INFO L125 PetriNetUnfolderBase]: For 15/15 co-relation queries the response was YES. [2023-08-24 12:36:10,763 INFO L83 FinitePrefix]: Finished finitePrefix Result has 117 conditions, 46 events. 16/46 cut-off events. For 15/15 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 66 event pairs, 7 based on Foata normal form. 9/55 useless extension candidates. Maximal degree in co-relation 103. Up to 34 conditions per place. [2023-08-24 12:36:10,763 INFO L140 encePairwiseOnDemand]: 219/222 looper letters, 0 selfloop transitions, 0 changer transitions 22/22 dead transitions. [2023-08-24 12:36:10,763 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 22 transitions, 95 flow [2023-08-24 12:36:10,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-24 12:36:10,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-24 12:36:10,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 418 transitions. [2023-08-24 12:36:10,765 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47072072072072074 [2023-08-24 12:36:10,765 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 418 transitions. [2023-08-24 12:36:10,765 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 418 transitions. [2023-08-24 12:36:10,766 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:36:10,766 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 418 transitions. [2023-08-24 12:36:10,767 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 104.5) internal successors, (418), 4 states have internal predecessors, (418), 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 12:36:10,769 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 222.0) internal successors, (1110), 5 states have internal predecessors, (1110), 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 12:36:10,769 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 222.0) internal successors, (1110), 5 states have internal predecessors, (1110), 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 12:36:10,769 INFO L175 Difference]: Start difference. First operand has 30 places, 16 transitions, 43 flow. Second operand 4 states and 418 transitions. [2023-08-24 12:36:10,769 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 22 transitions, 95 flow [2023-08-24 12:36:10,770 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 19 places, 22 transitions, 89 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-24 12:36:10,770 INFO L231 Difference]: Finished difference. Result has 19 places, 0 transitions, 0 flow [2023-08-24 12:36:10,770 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=222, PETRI_DIFFERENCE_MINUEND_FLOW=29, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=13, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=19, PETRI_TRANSITIONS=0} [2023-08-24 12:36:10,771 INFO L281 CegarLoopForPetriNet]: 27 programPoint places, -8 predicate places. [2023-08-24 12:36:10,771 INFO L495 AbstractCegarLoop]: Abstraction has has 19 places, 0 transitions, 0 flow [2023-08-24 12:36:10,771 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 101.28571428571429) internal successors, (709), 7 states have internal predecessors, (709), 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 12:36:10,773 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-24 12:36:10,784 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-08-24 12:36:10,978 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 12:36:10,978 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-24 12:36:10,980 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-24 12:36:10,983 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 109 places, 121 transitions, 250 flow [2023-08-24 12:36:11,004 INFO L124 PetriNetUnfolderBase]: 23/165 cut-off events. [2023-08-24 12:36:11,004 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-24 12:36:11,005 INFO L83 FinitePrefix]: Finished finitePrefix Result has 171 conditions, 165 events. 23/165 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 370 event pairs, 0 based on Foata normal form. 0/137 useless extension candidates. Maximal degree in co-relation 81. Up to 6 conditions per place. [2023-08-24 12:36:11,005 INFO L82 GeneralOperation]: Start removeDead. Operand has 109 places, 121 transitions, 250 flow [2023-08-24 12:36:11,006 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 105 places, 116 transitions, 237 flow [2023-08-24 12:36:11,006 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:36:11,006 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 105 places, 116 transitions, 237 flow [2023-08-24 12:36:11,006 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 105 places, 116 transitions, 237 flow [2023-08-24 12:36:11,006 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 105 places, 116 transitions, 237 flow [2023-08-24 12:36:11,014 INFO L124 PetriNetUnfolderBase]: 22/160 cut-off events. [2023-08-24 12:36:11,014 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:36:11,015 INFO L83 FinitePrefix]: Finished finitePrefix Result has 165 conditions, 160 events. 22/160 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 358 event pairs, 0 based on Foata normal form. 0/132 useless extension candidates. Maximal degree in co-relation 81. Up to 6 conditions per place. [2023-08-24 12:36:11,016 INFO L119 LiptonReduction]: Number of co-enabled transitions 2800 [2023-08-24 12:36:13,379 INFO L134 LiptonReduction]: Checked pairs total: 4353 [2023-08-24 12:36:13,380 INFO L136 LiptonReduction]: Total number of compositions: 104 [2023-08-24 12:36:13,381 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-24 12:36:13,382 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;@2a858314, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:36:13,382 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:36:13,384 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:36:13,384 INFO L124 PetriNetUnfolderBase]: 4/25 cut-off events. [2023-08-24 12:36:13,384 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:36:13,384 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:36:13,384 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-24 12:36:13,384 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-24 12:36:13,396 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:36:13,397 INFO L85 PathProgramCache]: Analyzing trace with hash -323426805, now seen corresponding path program 1 times [2023-08-24 12:36:13,397 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:36:13,397 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22962455] [2023-08-24 12:36:13,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:13,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:36:13,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:36:13,438 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-24 12:36:13,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:36:13,461 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-24 12:36:13,461 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-24 12:36:13,462 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-24 12:36:13,462 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-08-24 12:36:13,462 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-24 12:36:13,462 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-24 12:36:13,463 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-24 12:36:13,463 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-24 12:36:13,479 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-24 12:36:13,484 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 134 places, 151 transitions, 320 flow [2023-08-24 12:36:13,503 INFO L124 PetriNetUnfolderBase]: 40/264 cut-off events. [2023-08-24 12:36:13,504 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-24 12:36:13,506 INFO L83 FinitePrefix]: Finished finitePrefix Result has 278 conditions, 264 events. 40/264 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 742 event pairs, 0 based on Foata normal form. 0/217 useless extension candidates. Maximal degree in co-relation 167. Up to 9 conditions per place. [2023-08-24 12:36:13,506 INFO L82 GeneralOperation]: Start removeDead. Operand has 134 places, 151 transitions, 320 flow [2023-08-24 12:36:13,508 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 134 places, 151 transitions, 320 flow [2023-08-24 12:36:13,508 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:36:13,508 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 134 places, 151 transitions, 320 flow [2023-08-24 12:36:13,509 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 134 places, 151 transitions, 320 flow [2023-08-24 12:36:13,510 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 134 places, 151 transitions, 320 flow [2023-08-24 12:36:13,527 INFO L124 PetriNetUnfolderBase]: 40/264 cut-off events. [2023-08-24 12:36:13,528 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-24 12:36:13,529 INFO L83 FinitePrefix]: Finished finitePrefix Result has 278 conditions, 264 events. 40/264 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 742 event pairs, 0 based on Foata normal form. 0/217 useless extension candidates. Maximal degree in co-relation 167. Up to 9 conditions per place. [2023-08-24 12:36:13,532 INFO L119 LiptonReduction]: Number of co-enabled transitions 7784 [2023-08-24 12:36:15,779 INFO L134 LiptonReduction]: Checked pairs total: 18008 [2023-08-24 12:36:15,779 INFO L136 LiptonReduction]: Total number of compositions: 115 [2023-08-24 12:36:15,797 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:36:15,797 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@2a858314, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:36:15,797 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:36:15,810 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:36:15,810 INFO L124 PetriNetUnfolderBase]: 2/13 cut-off events. [2023-08-24 12:36:15,810 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:36:15,810 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:36:15,810 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-24 12:36:15,810 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:36:15,810 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:36:15,810 INFO L85 PathProgramCache]: Analyzing trace with hash 26684599, now seen corresponding path program 1 times [2023-08-24 12:36:15,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:36:15,811 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419234236] [2023-08-24 12:36:15,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:15,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:36:15,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:36:15,839 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 12:36:15,840 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:36:15,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419234236] [2023-08-24 12:36:15,840 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419234236] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:36:15,840 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:36:15,840 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:36:15,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288167639] [2023-08-24 12:36:15,840 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:36:15,841 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:36:15,841 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:36:15,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:36:15,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:36:15,846 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 121 out of 266 [2023-08-24 12:36:15,846 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 46 places, 59 transitions, 136 flow. Second operand has 3 states, 3 states have (on average 122.33333333333333) internal successors, (367), 3 states have internal predecessors, (367), 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 12:36:15,847 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:36:15,847 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 121 of 266 [2023-08-24 12:36:15,847 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:36:16,011 INFO L124 PetriNetUnfolderBase]: 1562/2817 cut-off events. [2023-08-24 12:36:16,011 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-24 12:36:16,013 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5397 conditions, 2817 events. 1562/2817 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 127. Compared 17440 event pairs, 704 based on Foata normal form. 384/2833 useless extension candidates. Maximal degree in co-relation 724. Up to 2513 conditions per place. [2023-08-24 12:36:16,017 INFO L140 encePairwiseOnDemand]: 247/266 looper letters, 28 selfloop transitions, 2 changer transitions 13/52 dead transitions. [2023-08-24 12:36:16,017 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 48 places, 52 transitions, 204 flow [2023-08-24 12:36:16,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:36:16,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:36:16,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 427 transitions. [2023-08-24 12:36:16,018 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5350877192982456 [2023-08-24 12:36:16,018 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 427 transitions. [2023-08-24 12:36:16,018 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 427 transitions. [2023-08-24 12:36:16,018 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:36:16,018 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 427 transitions. [2023-08-24 12:36:16,019 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 142.33333333333334) internal successors, (427), 3 states have internal predecessors, (427), 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 12:36:16,020 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 266.0) internal successors, (1064), 4 states have internal predecessors, (1064), 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 12:36:16,021 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 266.0) internal successors, (1064), 4 states have internal predecessors, (1064), 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 12:36:16,021 INFO L175 Difference]: Start difference. First operand has 46 places, 59 transitions, 136 flow. Second operand 3 states and 427 transitions. [2023-08-24 12:36:16,021 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 48 places, 52 transitions, 204 flow [2023-08-24 12:36:16,022 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 48 places, 52 transitions, 204 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-24 12:36:16,022 INFO L231 Difference]: Finished difference. Result has 49 places, 32 transitions, 82 flow [2023-08-24 12:36:16,022 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=266, PETRI_DIFFERENCE_MINUEND_FLOW=106, PETRI_DIFFERENCE_MINUEND_PLACES=46, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=44, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=42, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=82, PETRI_PLACES=49, PETRI_TRANSITIONS=32} [2023-08-24 12:36:16,023 INFO L281 CegarLoopForPetriNet]: 46 programPoint places, 3 predicate places. [2023-08-24 12:36:16,023 INFO L495 AbstractCegarLoop]: Abstraction has has 49 places, 32 transitions, 82 flow [2023-08-24 12:36:16,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 122.33333333333333) internal successors, (367), 3 states have internal predecessors, (367), 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 12:36:16,023 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:36:16,024 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:36:16,024 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-24 12:36:16,024 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:36:16,024 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:36:16,024 INFO L85 PathProgramCache]: Analyzing trace with hash -2053801901, now seen corresponding path program 1 times [2023-08-24 12:36:16,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:36:16,024 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456846450] [2023-08-24 12:36:16,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:16,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:36:16,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:36:16,052 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 12:36:16,052 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:36:16,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456846450] [2023-08-24 12:36:16,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456846450] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:36:16,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382040958] [2023-08-24 12:36:16,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:16,053 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:36:16,053 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:36:16,054 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 12:36:16,056 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 12:36:16,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:36:16,134 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-24 12:36:16,134 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:36:16,144 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 12:36:16,144 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:36:16,156 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 12:36:16,156 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1382040958] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:36:16,156 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:36:16,157 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-24 12:36:16,157 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319119852] [2023-08-24 12:36:16,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:36:16,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-24 12:36:16,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:36:16,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-24 12:36:16,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-24 12:36:16,158 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 121 out of 266 [2023-08-24 12:36:16,159 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 32 transitions, 82 flow. Second operand has 7 states, 7 states have (on average 123.28571428571429) internal successors, (863), 7 states have internal predecessors, (863), 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 12:36:16,159 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:36:16,159 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 121 of 266 [2023-08-24 12:36:16,159 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:36:16,229 INFO L124 PetriNetUnfolderBase]: 286/546 cut-off events. [2023-08-24 12:36:16,229 INFO L125 PetriNetUnfolderBase]: For 136/136 co-relation queries the response was YES. [2023-08-24 12:36:16,230 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1151 conditions, 546 events. 286/546 cut-off events. For 136/136 co-relation queries the response was YES. Maximal size of possible extension queue 30. Compared 2535 event pairs, 89 based on Foata normal form. 70/614 useless extension candidates. Maximal degree in co-relation 764. Up to 346 conditions per place. [2023-08-24 12:36:16,230 INFO L140 encePairwiseOnDemand]: 263/266 looper letters, 0 selfloop transitions, 0 changer transitions 51/51 dead transitions. [2023-08-24 12:36:16,230 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 51 transitions, 202 flow [2023-08-24 12:36:16,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-24 12:36:16,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-24 12:36:16,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 649 transitions. [2023-08-24 12:36:16,232 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48796992481203005 [2023-08-24 12:36:16,232 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 649 transitions. [2023-08-24 12:36:16,232 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 649 transitions. [2023-08-24 12:36:16,233 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:36:16,233 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 649 transitions. [2023-08-24 12:36:16,234 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 129.8) internal successors, (649), 5 states have internal predecessors, (649), 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 12:36:16,235 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 266.0) internal successors, (1596), 6 states have internal predecessors, (1596), 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 12:36:16,236 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 266.0) internal successors, (1596), 6 states have internal predecessors, (1596), 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 12:36:16,236 INFO L175 Difference]: Start difference. First operand has 49 places, 32 transitions, 82 flow. Second operand 5 states and 649 transitions. [2023-08-24 12:36:16,236 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 51 transitions, 202 flow [2023-08-24 12:36:16,237 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 51 transitions, 200 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-24 12:36:16,237 INFO L231 Difference]: Finished difference. Result has 39 places, 0 transitions, 0 flow [2023-08-24 12:36:16,237 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=266, 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 12:36:16,238 INFO L281 CegarLoopForPetriNet]: 46 programPoint places, -7 predicate places. [2023-08-24 12:36:16,238 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 0 transitions, 0 flow [2023-08-24 12:36:16,239 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 123.28571428571429) internal successors, (863), 7 states have internal predecessors, (863), 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 12:36:16,239 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-24 12:36:16,247 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-08-24 12:36:16,443 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 12:36:16,443 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-24 12:36:16,444 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-24 12:36:16,445 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 134 places, 151 transitions, 320 flow [2023-08-24 12:36:16,460 INFO L124 PetriNetUnfolderBase]: 40/264 cut-off events. [2023-08-24 12:36:16,461 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-24 12:36:16,461 INFO L83 FinitePrefix]: Finished finitePrefix Result has 278 conditions, 264 events. 40/264 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 742 event pairs, 0 based on Foata normal form. 0/217 useless extension candidates. Maximal degree in co-relation 167. Up to 9 conditions per place. [2023-08-24 12:36:16,461 INFO L82 GeneralOperation]: Start removeDead. Operand has 134 places, 151 transitions, 320 flow [2023-08-24 12:36:16,463 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 134 places, 151 transitions, 320 flow [2023-08-24 12:36:16,463 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:36:16,463 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 134 places, 151 transitions, 320 flow [2023-08-24 12:36:16,463 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 134 places, 151 transitions, 320 flow [2023-08-24 12:36:16,463 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 134 places, 151 transitions, 320 flow [2023-08-24 12:36:16,477 INFO L124 PetriNetUnfolderBase]: 40/264 cut-off events. [2023-08-24 12:36:16,477 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-24 12:36:16,478 INFO L83 FinitePrefix]: Finished finitePrefix Result has 278 conditions, 264 events. 40/264 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 742 event pairs, 0 based on Foata normal form. 0/217 useless extension candidates. Maximal degree in co-relation 167. Up to 9 conditions per place. [2023-08-24 12:36:16,481 INFO L119 LiptonReduction]: Number of co-enabled transitions 7784 [2023-08-24 12:36:18,501 INFO L134 LiptonReduction]: Checked pairs total: 17406 [2023-08-24 12:36:18,502 INFO L136 LiptonReduction]: Total number of compositions: 118 [2023-08-24 12:36:18,504 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-24 12:36:18,511 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;@2a858314, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:36:18,511 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:36:18,527 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:36:18,527 INFO L124 PetriNetUnfolderBase]: 15/62 cut-off events. [2023-08-24 12:36:18,527 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-24 12:36:18,527 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:36:18,527 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-24 12:36:18,528 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-24 12:36:18,528 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:36:18,528 INFO L85 PathProgramCache]: Analyzing trace with hash -261453029, now seen corresponding path program 1 times [2023-08-24 12:36:18,528 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:36:18,528 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198688408] [2023-08-24 12:36:18,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:18,528 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:36:18,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:36:18,555 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-24 12:36:18,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:36:18,590 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-24 12:36:18,590 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-24 12:36:18,590 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-24 12:36:18,590 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-24 12:36:18,590 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-24 12:36:18,591 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-24 12:36:18,591 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-24 12:36:18,591 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-24 12:36:18,617 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-24 12:36:18,618 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 159 places, 181 transitions, 392 flow [2023-08-24 12:36:18,640 INFO L124 PetriNetUnfolderBase]: 62/396 cut-off events. [2023-08-24 12:36:18,640 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-24 12:36:18,642 INFO L83 FinitePrefix]: Finished finitePrefix Result has 424 conditions, 396 events. 62/396 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1272 event pairs, 1 based on Foata normal form. 0/326 useless extension candidates. Maximal degree in co-relation 272. Up to 16 conditions per place. [2023-08-24 12:36:18,642 INFO L82 GeneralOperation]: Start removeDead. Operand has 159 places, 181 transitions, 392 flow [2023-08-24 12:36:18,644 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 159 places, 181 transitions, 392 flow [2023-08-24 12:36:18,644 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:36:18,645 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 159 places, 181 transitions, 392 flow [2023-08-24 12:36:18,645 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 159 places, 181 transitions, 392 flow [2023-08-24 12:36:18,645 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 159 places, 181 transitions, 392 flow [2023-08-24 12:36:18,665 INFO L124 PetriNetUnfolderBase]: 62/396 cut-off events. [2023-08-24 12:36:18,666 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-24 12:36:18,667 INFO L83 FinitePrefix]: Finished finitePrefix Result has 424 conditions, 396 events. 62/396 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1272 event pairs, 1 based on Foata normal form. 0/326 useless extension candidates. Maximal degree in co-relation 272. Up to 16 conditions per place. [2023-08-24 12:36:18,678 INFO L119 LiptonReduction]: Number of co-enabled transitions 14280 [2023-08-24 12:36:21,069 INFO L134 LiptonReduction]: Checked pairs total: 35343 [2023-08-24 12:36:21,069 INFO L136 LiptonReduction]: Total number of compositions: 130 [2023-08-24 12:36:21,070 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:36:21,071 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;@2a858314, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:36:21,071 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:36:21,072 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:36:21,072 INFO L124 PetriNetUnfolderBase]: 2/13 cut-off events. [2023-08-24 12:36:21,072 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:36:21,072 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:36:21,072 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-24 12:36:21,073 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:36:21,073 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:36:21,073 INFO L85 PathProgramCache]: Analyzing trace with hash 40813310, now seen corresponding path program 1 times [2023-08-24 12:36:21,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:36:21,073 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950616137] [2023-08-24 12:36:21,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:21,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:36:21,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:36:21,118 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 12:36:21,118 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:36:21,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950616137] [2023-08-24 12:36:21,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950616137] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:36:21,119 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:36:21,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:36:21,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491917188] [2023-08-24 12:36:21,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:36:21,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:36:21,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:36:21,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:36:21,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:36:21,121 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 143 out of 311 [2023-08-24 12:36:21,121 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 60 places, 78 transitions, 186 flow. Second operand has 3 states, 3 states have (on average 144.33333333333334) internal successors, (433), 3 states have internal predecessors, (433), 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 12:36:21,121 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:36:21,121 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 143 of 311 [2023-08-24 12:36:21,121 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:36:22,591 INFO L124 PetriNetUnfolderBase]: 17546/26817 cut-off events. [2023-08-24 12:36:22,591 INFO L125 PetriNetUnfolderBase]: For 709/709 co-relation queries the response was YES. [2023-08-24 12:36:22,613 INFO L83 FinitePrefix]: Finished finitePrefix Result has 52152 conditions, 26817 events. 17546/26817 cut-off events. For 709/709 co-relation queries the response was YES. Maximal size of possible extension queue 897. Compared 194555 event pairs, 14971 based on Foata normal form. 6572/30125 useless extension candidates. Maximal degree in co-relation 9920. Up to 24769 conditions per place. [2023-08-24 12:36:22,653 INFO L140 encePairwiseOnDemand]: 286/311 looper letters, 35 selfloop transitions, 2 changer transitions 14/65 dead transitions. [2023-08-24 12:36:22,654 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 62 places, 65 transitions, 258 flow [2023-08-24 12:36:22,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:36:22,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:36:22,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 507 transitions. [2023-08-24 12:36:22,655 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5434083601286174 [2023-08-24 12:36:22,655 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 507 transitions. [2023-08-24 12:36:22,655 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 507 transitions. [2023-08-24 12:36:22,655 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:36:22,656 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 507 transitions. [2023-08-24 12:36:22,656 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 169.0) internal successors, (507), 3 states have internal predecessors, (507), 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 12:36:22,757 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 311.0) internal successors, (1244), 4 states have internal predecessors, (1244), 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 12:36:22,758 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 311.0) internal successors, (1244), 4 states have internal predecessors, (1244), 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 12:36:22,758 INFO L175 Difference]: Start difference. First operand has 60 places, 78 transitions, 186 flow. Second operand 3 states and 507 transitions. [2023-08-24 12:36:22,758 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 62 places, 65 transitions, 258 flow [2023-08-24 12:36:22,760 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 62 places, 65 transitions, 258 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-24 12:36:22,761 INFO L231 Difference]: Finished difference. Result has 63 places, 44 transitions, 113 flow [2023-08-24 12:36:22,761 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=311, PETRI_DIFFERENCE_MINUEND_FLOW=144, PETRI_DIFFERENCE_MINUEND_PLACES=60, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=57, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=113, PETRI_PLACES=63, PETRI_TRANSITIONS=44} [2023-08-24 12:36:22,761 INFO L281 CegarLoopForPetriNet]: 60 programPoint places, 3 predicate places. [2023-08-24 12:36:22,761 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 44 transitions, 113 flow [2023-08-24 12:36:22,762 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 144.33333333333334) internal successors, (433), 3 states have internal predecessors, (433), 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 12:36:22,762 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:36:22,762 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:36:22,762 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-24 12:36:22,762 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:36:22,762 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:36:22,762 INFO L85 PathProgramCache]: Analyzing trace with hash -714906693, now seen corresponding path program 1 times [2023-08-24 12:36:22,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:36:22,762 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411273853] [2023-08-24 12:36:22,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:22,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:36:22,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:36:22,803 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 12:36:22,803 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:36:22,803 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411273853] [2023-08-24 12:36:22,803 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411273853] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:36:22,803 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705813357] [2023-08-24 12:36:22,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:22,803 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:36:22,803 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:36:22,804 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 12:36:22,806 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 12:36:22,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:36:22,859 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-24 12:36:22,859 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:36:22,868 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 12:36:22,868 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:36:22,880 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 12:36:22,880 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [705813357] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:36:22,880 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:36:22,880 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-24 12:36:22,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969420877] [2023-08-24 12:36:22,880 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:36:22,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-24 12:36:22,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:36:22,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-24 12:36:22,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-24 12:36:22,882 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 143 out of 311 [2023-08-24 12:36:22,883 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 44 transitions, 113 flow. Second operand has 7 states, 7 states have (on average 145.28571428571428) internal successors, (1017), 7 states have internal predecessors, (1017), 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 12:36:22,883 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:36:22,883 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 143 of 311 [2023-08-24 12:36:22,884 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:36:23,143 INFO L124 PetriNetUnfolderBase]: 3352/5297 cut-off events. [2023-08-24 12:36:23,143 INFO L125 PetriNetUnfolderBase]: For 713/713 co-relation queries the response was YES. [2023-08-24 12:36:23,149 INFO L83 FinitePrefix]: Finished finitePrefix Result has 10985 conditions, 5297 events. 3352/5297 cut-off events. For 713/713 co-relation queries the response was YES. Maximal size of possible extension queue 193. Compared 32806 event pairs, 40 based on Foata normal form. 511/5805 useless extension candidates. Maximal degree in co-relation 7679. Up to 3178 conditions per place. [2023-08-24 12:36:23,151 INFO L140 encePairwiseOnDemand]: 308/311 looper letters, 0 selfloop transitions, 0 changer transitions 85/85 dead transitions. [2023-08-24 12:36:23,152 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 85 transitions, 337 flow [2023-08-24 12:36:23,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-24 12:36:23,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-24 12:36:23,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 932 transitions. [2023-08-24 12:36:23,155 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4994640943193998 [2023-08-24 12:36:23,155 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 932 transitions. [2023-08-24 12:36:23,155 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 932 transitions. [2023-08-24 12:36:23,156 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:36:23,156 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 932 transitions. [2023-08-24 12:36:23,159 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 155.33333333333334) internal successors, (932), 6 states have internal predecessors, (932), 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 12:36:23,162 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 311.0) internal successors, (2177), 7 states have internal predecessors, (2177), 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 12:36:23,162 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 311.0) internal successors, (2177), 7 states have internal predecessors, (2177), 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 12:36:23,163 INFO L175 Difference]: Start difference. First operand has 63 places, 44 transitions, 113 flow. Second operand 6 states and 932 transitions. [2023-08-24 12:36:23,163 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 85 transitions, 337 flow [2023-08-24 12:36:23,166 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 85 transitions, 333 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-24 12:36:23,166 INFO L231 Difference]: Finished difference. Result has 54 places, 0 transitions, 0 flow [2023-08-24 12:36:23,166 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=311, 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 12:36:23,168 INFO L281 CegarLoopForPetriNet]: 60 programPoint places, -6 predicate places. [2023-08-24 12:36:23,168 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 0 transitions, 0 flow [2023-08-24 12:36:23,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 145.28571428571428) internal successors, (1017), 7 states have internal predecessors, (1017), 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 12:36:23,168 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-24 12:36:23,172 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-08-24 12:36:23,372 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 12:36:23,372 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-24 12:36:23,373 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-24 12:36:23,374 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 159 places, 181 transitions, 392 flow [2023-08-24 12:36:23,393 INFO L124 PetriNetUnfolderBase]: 62/396 cut-off events. [2023-08-24 12:36:23,393 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-24 12:36:23,394 INFO L83 FinitePrefix]: Finished finitePrefix Result has 424 conditions, 396 events. 62/396 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1272 event pairs, 1 based on Foata normal form. 0/326 useless extension candidates. Maximal degree in co-relation 272. Up to 16 conditions per place. [2023-08-24 12:36:23,394 INFO L82 GeneralOperation]: Start removeDead. Operand has 159 places, 181 transitions, 392 flow [2023-08-24 12:36:23,396 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 159 places, 181 transitions, 392 flow [2023-08-24 12:36:23,396 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:36:23,396 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 159 places, 181 transitions, 392 flow [2023-08-24 12:36:23,396 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 159 places, 181 transitions, 392 flow [2023-08-24 12:36:23,396 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 159 places, 181 transitions, 392 flow [2023-08-24 12:36:23,493 INFO L124 PetriNetUnfolderBase]: 62/396 cut-off events. [2023-08-24 12:36:23,494 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-24 12:36:23,495 INFO L83 FinitePrefix]: Finished finitePrefix Result has 424 conditions, 396 events. 62/396 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1272 event pairs, 1 based on Foata normal form. 0/326 useless extension candidates. Maximal degree in co-relation 272. Up to 16 conditions per place. [2023-08-24 12:36:23,499 INFO L119 LiptonReduction]: Number of co-enabled transitions 14280 [2023-08-24 12:36:26,014 INFO L134 LiptonReduction]: Checked pairs total: 34951 [2023-08-24 12:36:26,014 INFO L136 LiptonReduction]: Total number of compositions: 130 [2023-08-24 12:36:26,015 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-24 12:36:26,016 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;@2a858314, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:36:26,016 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:36:26,021 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:36:26,021 INFO L124 PetriNetUnfolderBase]: 26/103 cut-off events. [2023-08-24 12:36:26,021 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-24 12:36:26,021 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:36:26,021 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-24 12:36:26,021 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-24 12:36:26,021 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:36:26,022 INFO L85 PathProgramCache]: Analyzing trace with hash 1216350337, now seen corresponding path program 1 times [2023-08-24 12:36:26,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:36:26,022 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344406756] [2023-08-24 12:36:26,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:26,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:36:26,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:36:26,031 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-24 12:36:26,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:36:26,040 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-24 12:36:26,040 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-24 12:36:26,040 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-24 12:36:26,040 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-24 12:36:26,040 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-24 12:36:26,041 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-24 12:36:26,041 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-24 12:36:26,041 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-24 12:36:26,055 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-24 12:36:26,057 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 184 places, 211 transitions, 466 flow [2023-08-24 12:36:26,103 INFO L124 PetriNetUnfolderBase]: 96/596 cut-off events. [2023-08-24 12:36:26,103 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-24 12:36:26,106 INFO L83 FinitePrefix]: Finished finitePrefix Result has 651 conditions, 596 events. 96/596 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 2208 event pairs, 6 based on Foata normal form. 0/495 useless extension candidates. Maximal degree in co-relation 416. Up to 32 conditions per place. [2023-08-24 12:36:26,107 INFO L82 GeneralOperation]: Start removeDead. Operand has 184 places, 211 transitions, 466 flow [2023-08-24 12:36:26,112 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 184 places, 211 transitions, 466 flow [2023-08-24 12:36:26,113 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:36:26,113 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 184 places, 211 transitions, 466 flow [2023-08-24 12:36:26,113 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 184 places, 211 transitions, 466 flow [2023-08-24 12:36:26,113 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 184 places, 211 transitions, 466 flow [2023-08-24 12:36:26,159 INFO L124 PetriNetUnfolderBase]: 96/596 cut-off events. [2023-08-24 12:36:26,159 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-24 12:36:26,162 INFO L83 FinitePrefix]: Finished finitePrefix Result has 651 conditions, 596 events. 96/596 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 2208 event pairs, 6 based on Foata normal form. 0/495 useless extension candidates. Maximal degree in co-relation 416. Up to 32 conditions per place. [2023-08-24 12:36:26,173 INFO L119 LiptonReduction]: Number of co-enabled transitions 22512 [2023-08-24 12:36:28,768 INFO L134 LiptonReduction]: Checked pairs total: 65562 [2023-08-24 12:36:28,769 INFO L136 LiptonReduction]: Total number of compositions: 148 [2023-08-24 12:36:28,770 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:36:28,771 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;@2a858314, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:36:28,771 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:36:28,772 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:36:28,772 INFO L124 PetriNetUnfolderBase]: 2/12 cut-off events. [2023-08-24 12:36:28,772 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:36:28,777 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:36:28,777 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-24 12:36:28,777 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:36:28,777 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:36:28,777 INFO L85 PathProgramCache]: Analyzing trace with hash 56788524, now seen corresponding path program 1 times [2023-08-24 12:36:28,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:36:28,777 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450958189] [2023-08-24 12:36:28,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:28,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:36:28,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:36:28,810 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-24 12:36:28,810 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:36:28,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450958189] [2023-08-24 12:36:28,810 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1450958189] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:36:28,810 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:36:28,810 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:36:28,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726149334] [2023-08-24 12:36:28,810 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:36:28,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:36:28,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:36:28,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:36:28,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:36:28,813 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 165 out of 359 [2023-08-24 12:36:28,813 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 95 transitions, 234 flow. Second operand has 3 states, 3 states have (on average 166.33333333333334) internal successors, (499), 3 states have internal predecessors, (499), 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 12:36:28,813 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:36:28,814 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 165 of 359 [2023-08-24 12:36:28,814 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:36:54,287 INFO L124 PetriNetUnfolderBase]: 298488/413993 cut-off events. [2023-08-24 12:36:54,287 INFO L125 PetriNetUnfolderBase]: For 14774/14774 co-relation queries the response was YES. [2023-08-24 12:36:54,868 INFO L83 FinitePrefix]: Finished finitePrefix Result has 810088 conditions, 413993 events. 298488/413993 cut-off events. For 14774/14774 co-relation queries the response was YES. Maximal size of possible extension queue 9142. Compared 3258121 event pairs, 214740 based on Foata normal form. 66901/447989 useless extension candidates. Maximal degree in co-relation 70928. Up to 387778 conditions per place. [2023-08-24 12:36:55,500 INFO L140 encePairwiseOnDemand]: 329/359 looper letters, 49 selfloop transitions, 2 changer transitions 14/79 dead transitions. [2023-08-24 12:36:55,501 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 75 places, 79 transitions, 328 flow [2023-08-24 12:36:55,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:36:55,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:36:55,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 592 transitions. [2023-08-24 12:36:55,503 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5496750232126276 [2023-08-24 12:36:55,503 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 592 transitions. [2023-08-24 12:36:55,503 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 592 transitions. [2023-08-24 12:36:55,503 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:36:55,503 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 592 transitions. [2023-08-24 12:36:55,504 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 197.33333333333334) internal successors, (592), 3 states have internal predecessors, (592), 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 12:36:55,506 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 359.0) internal successors, (1436), 4 states have internal predecessors, (1436), 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 12:36:55,506 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 359.0) internal successors, (1436), 4 states have internal predecessors, (1436), 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 12:36:55,506 INFO L175 Difference]: Start difference. First operand has 73 places, 95 transitions, 234 flow. Second operand 3 states and 592 transitions. [2023-08-24 12:36:55,506 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 75 places, 79 transitions, 328 flow [2023-08-24 12:36:55,512 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 75 places, 79 transitions, 328 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-24 12:36:55,513 INFO L231 Difference]: Finished difference. Result has 76 places, 56 transitions, 146 flow [2023-08-24 12:36:55,514 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=359, PETRI_DIFFERENCE_MINUEND_FLOW=182, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=69, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=67, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=146, PETRI_PLACES=76, PETRI_TRANSITIONS=56} [2023-08-24 12:36:55,514 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 3 predicate places. [2023-08-24 12:36:55,514 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 56 transitions, 146 flow [2023-08-24 12:36:55,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 166.33333333333334) internal successors, (499), 3 states have internal predecessors, (499), 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 12:36:55,514 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:36:55,514 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:36:55,514 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-24 12:36:55,515 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:36:55,515 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:36:55,515 INFO L85 PathProgramCache]: Analyzing trace with hash -1162080077, now seen corresponding path program 1 times [2023-08-24 12:36:55,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:36:55,515 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896265092] [2023-08-24 12:36:55,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:55,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:36:55,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:36:55,572 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 12:36:55,572 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:36:55,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896265092] [2023-08-24 12:36:55,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896265092] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:36:55,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160462896] [2023-08-24 12:36:55,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:36:55,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:36:55,572 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:36:55,573 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 12:36:55,575 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 12:36:55,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:36:55,654 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-24 12:36:55,654 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:36:55,664 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 12:36:55,664 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:36:55,678 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 12:36:55,678 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160462896] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:36:55,678 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:36:55,679 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-24 12:36:55,679 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440076315] [2023-08-24 12:36:55,679 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:36:55,679 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-24 12:36:55,679 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:36:55,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-24 12:36:55,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-24 12:36:55,680 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 165 out of 359 [2023-08-24 12:36:55,681 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 56 transitions, 146 flow. Second operand has 7 states, 7 states have (on average 167.28571428571428) internal successors, (1171), 7 states have internal predecessors, (1171), 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 12:36:55,681 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:36:55,681 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 165 of 359 [2023-08-24 12:36:55,681 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:37:04,417 INFO L124 PetriNetUnfolderBase]: 123712/165100 cut-off events. [2023-08-24 12:37:04,417 INFO L125 PetriNetUnfolderBase]: For 11493/11493 co-relation queries the response was YES. [2023-08-24 12:37:04,636 INFO L83 FinitePrefix]: Finished finitePrefix Result has 342033 conditions, 165100 events. 123712/165100 cut-off events. For 11493/11493 co-relation queries the response was YES. Maximal size of possible extension queue 4083. Compared 1130916 event pairs, 8829 based on Foata normal form. 738/165811 useless extension candidates. Maximal degree in co-relation 38916. Up to 105949 conditions per place. [2023-08-24 12:37:05,037 INFO L140 encePairwiseOnDemand]: 355/359 looper letters, 120 selfloop transitions, 5 changer transitions 1/140 dead transitions. [2023-08-24 12:37:05,037 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 140 transitions, 570 flow [2023-08-24 12:37:05,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-24 12:37:05,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-24 12:37:05,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1119 transitions. [2023-08-24 12:37:05,039 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5194986072423399 [2023-08-24 12:37:05,039 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1119 transitions. [2023-08-24 12:37:05,039 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1119 transitions. [2023-08-24 12:37:05,040 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:37:05,040 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1119 transitions. [2023-08-24 12:37:05,041 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 186.5) internal successors, (1119), 6 states have internal predecessors, (1119), 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 12:37:05,044 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 359.0) internal successors, (2513), 7 states have internal predecessors, (2513), 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 12:37:05,044 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 359.0) internal successors, (2513), 7 states have internal predecessors, (2513), 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 12:37:05,044 INFO L175 Difference]: Start difference. First operand has 76 places, 56 transitions, 146 flow. Second operand 6 states and 1119 transitions. [2023-08-24 12:37:05,044 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 140 transitions, 570 flow [2023-08-24 12:37:05,048 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 71 places, 140 transitions, 562 flow, removed 3 selfloop flow, removed 1 redundant places. [2023-08-24 12:37:05,049 INFO L231 Difference]: Finished difference. Result has 75 places, 58 transitions, 172 flow [2023-08-24 12:37:05,049 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=359, 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 12:37:05,049 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 2 predicate places. [2023-08-24 12:37:05,050 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 58 transitions, 172 flow [2023-08-24 12:37:05,050 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 167.28571428571428) internal successors, (1171), 7 states have internal predecessors, (1171), 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 12:37:05,050 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:37:05,050 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:37:05,069 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 12:37:05,256 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 12:37:05,256 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:37:05,256 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:37:05,256 INFO L85 PathProgramCache]: Analyzing trace with hash -772325118, now seen corresponding path program 1 times [2023-08-24 12:37:05,256 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:37:05,257 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094984328] [2023-08-24 12:37:05,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:37:05,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:37:05,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:37:05,333 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-08-24 12:37:05,333 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:37:05,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094984328] [2023-08-24 12:37:05,333 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2094984328] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:37:05,334 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:37:05,334 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-24 12:37:05,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699959070] [2023-08-24 12:37:05,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:37:05,335 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:37:05,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:37:05,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:37:05,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:37:05,336 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 155 out of 359 [2023-08-24 12:37:05,336 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 58 transitions, 172 flow. Second operand has 3 states, 3 states have (on average 158.33333333333334) internal successors, (475), 3 states have internal predecessors, (475), 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 12:37:05,336 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:37:05,336 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 155 of 359 [2023-08-24 12:37:05,336 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:37:19,126 INFO L124 PetriNetUnfolderBase]: 193460/251438 cut-off events. [2023-08-24 12:37:19,126 INFO L125 PetriNetUnfolderBase]: For 184848/184848 co-relation queries the response was YES. [2023-08-24 12:37:19,600 INFO L83 FinitePrefix]: Finished finitePrefix Result has 586334 conditions, 251438 events. 193460/251438 cut-off events. For 184848/184848 co-relation queries the response was YES. Maximal size of possible extension queue 5226. Compared 1606737 event pairs, 97454 based on Foata normal form. 144/251553 useless extension candidates. Maximal degree in co-relation 453665. Up to 248558 conditions per place. [2023-08-24 12:37:20,547 INFO L140 encePairwiseOnDemand]: 353/359 looper letters, 69 selfloop transitions, 5 changer transitions 0/82 dead transitions. [2023-08-24 12:37:20,548 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 77 places, 82 transitions, 416 flow [2023-08-24 12:37:20,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-24 12:37:20,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-24 12:37:20,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 534 transitions. [2023-08-24 12:37:20,550 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4958217270194986 [2023-08-24 12:37:20,550 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 534 transitions. [2023-08-24 12:37:20,550 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 534 transitions. [2023-08-24 12:37:20,550 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:37:20,550 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 534 transitions. [2023-08-24 12:37:20,551 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 178.0) internal successors, (534), 3 states have internal predecessors, (534), 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 12:37:20,552 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 359.0) internal successors, (1436), 4 states have internal predecessors, (1436), 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 12:37:20,553 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 359.0) internal successors, (1436), 4 states have internal predecessors, (1436), 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 12:37:20,553 INFO L175 Difference]: Start difference. First operand has 75 places, 58 transitions, 172 flow. Second operand 3 states and 534 transitions. [2023-08-24 12:37:20,553 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 77 places, 82 transitions, 416 flow [2023-08-24 12:37:20,591 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 82 transitions, 396 flow, removed 6 selfloop flow, removed 3 redundant places. [2023-08-24 12:37:20,592 INFO L231 Difference]: Finished difference. Result has 75 places, 62 transitions, 194 flow [2023-08-24 12:37:20,592 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=359, PETRI_DIFFERENCE_MINUEND_FLOW=161, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=53, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=194, PETRI_PLACES=75, PETRI_TRANSITIONS=62} [2023-08-24 12:37:20,592 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 2 predicate places. [2023-08-24 12:37:20,593 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 62 transitions, 194 flow [2023-08-24 12:37:20,593 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 158.33333333333334) internal successors, (475), 3 states have internal predecessors, (475), 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 12:37:20,593 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:37:20,593 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-24 12:37:20,593 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-24 12:37:20,593 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:37:20,593 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:37:20,593 INFO L85 PathProgramCache]: Analyzing trace with hash 1637137645, now seen corresponding path program 1 times [2023-08-24 12:37:20,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:37:20,593 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685766221] [2023-08-24 12:37:20,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:37:20,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:37:20,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:37:20,655 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 12:37:20,655 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:37:20,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685766221] [2023-08-24 12:37:20,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685766221] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-24 12:37:20,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662378657] [2023-08-24 12:37:20,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:37:20,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-24 12:37:20,655 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-24 12:37:20,669 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 12:37:20,670 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 12:37:20,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:37:20,746 INFO L262 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-24 12:37:20,747 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-24 12:37:20,779 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 12:37:20,779 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-24 12:37:20,836 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 12:37:20,836 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662378657] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-24 12:37:20,836 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-24 12:37:20,836 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-24 12:37:20,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727110325] [2023-08-24 12:37:20,836 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-24 12:37:20,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-24 12:37:20,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:37:20,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-24 12:37:20,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-24 12:37:20,838 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 165 out of 359 [2023-08-24 12:37:20,840 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 62 transitions, 194 flow. Second operand has 13 states, 13 states have (on average 168.0) internal successors, (2184), 13 states have internal predecessors, (2184), 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 12:37:20,840 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:37:20,840 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 165 of 359 [2023-08-24 12:37:20,840 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-24 12:37:24,270 INFO L124 PetriNetUnfolderBase]: 41092/57838 cut-off events. [2023-08-24 12:37:24,271 INFO L125 PetriNetUnfolderBase]: For 43272/43278 co-relation queries the response was YES. [2023-08-24 12:37:24,408 INFO L83 FinitePrefix]: Finished finitePrefix Result has 129483 conditions, 57838 events. 41092/57838 cut-off events. For 43272/43278 co-relation queries the response was YES. Maximal size of possible extension queue 1540. Compared 390282 event pairs, 552 based on Foata normal form. 5832/63655 useless extension candidates. Maximal degree in co-relation 84026. Up to 26487 conditions per place. [2023-08-24 12:37:24,441 INFO L140 encePairwiseOnDemand]: 356/359 looper letters, 0 selfloop transitions, 0 changer transitions 149/149 dead transitions. [2023-08-24 12:37:24,441 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 149 transitions, 682 flow [2023-08-24 12:37:24,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-24 12:37:24,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-24 12:37:24,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1278 transitions. [2023-08-24 12:37:24,444 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5085555113410266 [2023-08-24 12:37:24,444 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1278 transitions. [2023-08-24 12:37:24,444 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1278 transitions. [2023-08-24 12:37:24,444 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-24 12:37:24,444 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1278 transitions. [2023-08-24 12:37:24,446 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 182.57142857142858) internal successors, (1278), 7 states have internal predecessors, (1278), 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 12:37:24,449 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 359.0) internal successors, (2872), 8 states have internal predecessors, (2872), 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 12:37:24,449 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 359.0) internal successors, (2872), 8 states have internal predecessors, (2872), 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 12:37:24,449 INFO L175 Difference]: Start difference. First operand has 75 places, 62 transitions, 194 flow. Second operand 7 states and 1278 transitions. [2023-08-24 12:37:24,449 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 149 transitions, 682 flow [2023-08-24 12:37:24,457 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 149 transitions, 659 flow, removed 0 selfloop flow, removed 5 redundant places. [2023-08-24 12:37:24,458 INFO L231 Difference]: Finished difference. Result has 73 places, 0 transitions, 0 flow [2023-08-24 12:37:24,458 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=359, PETRI_DIFFERENCE_MINUEND_FLOW=165, PETRI_DIFFERENCE_MINUEND_PLACES=67, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=59, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=0, PETRI_PLACES=73, PETRI_TRANSITIONS=0} [2023-08-24 12:37:24,459 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 0 predicate places. [2023-08-24 12:37:24,459 INFO L495 AbstractCegarLoop]: Abstraction has has 73 places, 0 transitions, 0 flow [2023-08-24 12:37:24,459 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 168.0) internal successors, (2184), 13 states have internal predecessors, (2184), 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 12:37:24,460 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-24 12:37:24,468 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-08-24 12:37:24,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-08-24 12:37:24,665 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-24 12:37:24,665 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-24 12:37:24,667 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 184 places, 211 transitions, 466 flow [2023-08-24 12:37:24,702 INFO L124 PetriNetUnfolderBase]: 96/596 cut-off events. [2023-08-24 12:37:24,702 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-24 12:37:24,705 INFO L83 FinitePrefix]: Finished finitePrefix Result has 651 conditions, 596 events. 96/596 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 2208 event pairs, 6 based on Foata normal form. 0/495 useless extension candidates. Maximal degree in co-relation 416. Up to 32 conditions per place. [2023-08-24 12:37:24,705 INFO L82 GeneralOperation]: Start removeDead. Operand has 184 places, 211 transitions, 466 flow [2023-08-24 12:37:24,707 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 184 places, 211 transitions, 466 flow [2023-08-24 12:37:24,707 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:37:24,707 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 184 places, 211 transitions, 466 flow [2023-08-24 12:37:24,707 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 184 places, 211 transitions, 466 flow [2023-08-24 12:37:24,707 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 184 places, 211 transitions, 466 flow [2023-08-24 12:37:24,742 INFO L124 PetriNetUnfolderBase]: 96/596 cut-off events. [2023-08-24 12:37:24,743 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-24 12:37:24,745 INFO L83 FinitePrefix]: Finished finitePrefix Result has 651 conditions, 596 events. 96/596 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 2208 event pairs, 6 based on Foata normal form. 0/495 useless extension candidates. Maximal degree in co-relation 416. Up to 32 conditions per place. [2023-08-24 12:37:24,754 INFO L119 LiptonReduction]: Number of co-enabled transitions 22512 [2023-08-24 12:37:27,258 INFO L134 LiptonReduction]: Checked pairs total: 59098 [2023-08-24 12:37:27,258 INFO L136 LiptonReduction]: Total number of compositions: 148 [2023-08-24 12:37:27,259 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-24 12:37:27,260 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;@2a858314, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:37:27,260 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:37:27,418 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:37:27,418 INFO L124 PetriNetUnfolderBase]: 36/143 cut-off events. [2023-08-24 12:37:27,418 INFO L125 PetriNetUnfolderBase]: For 23/23 co-relation queries the response was YES. [2023-08-24 12:37:27,419 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:37:27,419 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-24 12:37:27,419 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-24 12:37:27,420 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:37:27,420 INFO L85 PathProgramCache]: Analyzing trace with hash -948357504, now seen corresponding path program 1 times [2023-08-24 12:37:27,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:37:27,420 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819254024] [2023-08-24 12:37:27,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:37:27,420 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:37:27,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:37:27,437 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-24 12:37:27,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-24 12:37:27,458 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-24 12:37:27,458 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-24 12:37:27,458 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-24 12:37:27,458 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-24 12:37:27,458 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-24 12:37:27,461 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-24 12:37:27,461 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-24 12:37:27,461 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-24 12:37:27,485 INFO L144 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2023-08-24 12:37:27,488 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 209 places, 241 transitions, 542 flow [2023-08-24 12:37:27,562 INFO L124 PetriNetUnfolderBase]: 158/936 cut-off events. [2023-08-24 12:37:27,563 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-24 12:37:27,568 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1047 conditions, 936 events. 158/936 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 4105 event pairs, 23 based on Foata normal form. 0/788 useless extension candidates. Maximal degree in co-relation 641. Up to 80 conditions per place. [2023-08-24 12:37:27,569 INFO L82 GeneralOperation]: Start removeDead. Operand has 209 places, 241 transitions, 542 flow [2023-08-24 12:37:27,572 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 209 places, 241 transitions, 542 flow [2023-08-24 12:37:27,572 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-24 12:37:27,572 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 209 places, 241 transitions, 542 flow [2023-08-24 12:37:27,573 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 209 places, 241 transitions, 542 flow [2023-08-24 12:37:27,573 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 209 places, 241 transitions, 542 flow [2023-08-24 12:37:27,641 INFO L124 PetriNetUnfolderBase]: 158/936 cut-off events. [2023-08-24 12:37:27,642 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-24 12:37:27,648 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1047 conditions, 936 events. 158/936 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 4105 event pairs, 23 based on Foata normal form. 0/788 useless extension candidates. Maximal degree in co-relation 641. Up to 80 conditions per place. [2023-08-24 12:37:27,665 INFO L119 LiptonReduction]: Number of co-enabled transitions 32480 [2023-08-24 12:37:30,080 INFO L134 LiptonReduction]: Checked pairs total: 90705 [2023-08-24 12:37:30,080 INFO L136 LiptonReduction]: Total number of compositions: 160 [2023-08-24 12:37:30,081 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-24 12:37:30,081 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;@2a858314, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-24 12:37:30,081 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-24 12:37:30,082 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-24 12:37:30,082 INFO L124 PetriNetUnfolderBase]: 2/13 cut-off events. [2023-08-24 12:37:30,082 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-24 12:37:30,082 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-24 12:37:30,082 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-24 12:37:30,083 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-24 12:37:30,083 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-24 12:37:30,083 INFO L85 PathProgramCache]: Analyzing trace with hash 74616495, now seen corresponding path program 1 times [2023-08-24 12:37:30,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-24 12:37:30,083 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604049965] [2023-08-24 12:37:30,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-24 12:37:30,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-24 12:37:30,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-24 12:37:30,098 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 12:37:30,099 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-24 12:37:30,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604049965] [2023-08-24 12:37:30,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604049965] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-24 12:37:30,099 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-24 12:37:30,099 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-24 12:37:30,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783251906] [2023-08-24 12:37:30,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-24 12:37:30,099 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-24 12:37:30,099 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-24 12:37:30,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-24 12:37:30,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-24 12:37:30,100 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 187 out of 401 [2023-08-24 12:37:30,101 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 88 places, 116 transitions, 292 flow. Second operand has 3 states, 3 states have (on average 188.33333333333334) internal successors, (565), 3 states have internal predecessors, (565), 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 12:37:30,101 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-24 12:37:30,101 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 187 of 401 [2023-08-24 12:37:30,101 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand