/usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-NoLbe.epf --traceabstraction.compute.hoare.annotation.of.negated.interpolant.automaton,.abstraction.and.cfg true --cacsl2boogietranslator.check.unreachability.of.reach_error.function false --cacsl2boogietranslator.pointer.base.address.is.valid.at.dereference ASSERTandASSUME --cacsl2boogietranslator.pointer.to.allocated.memory.at.dereference ASSERTandASSUME --cacsl2boogietranslator.check.array.bounds.for.arrays.that.are.off.heap ASSERTandASSUME --cacsl2boogietranslator.check.if.freed.pointer.was.valid true --cacsl2boogietranslator.adapt.memory.model.on.pointer.casts.if.necessary true -i ../../../trunk/examples/svcomp/pthread-ext/26_stack_cas_longest-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.4-wip.dk.empire-owicki-175f719-m [2023-11-30 04:31:41,206 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-30 04:31:41,269 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-NoLbe.epf [2023-11-30 04:31:41,290 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-30 04:31:41,291 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-30 04:31:41,291 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-30 04:31:41,292 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-30 04:31:41,292 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-30 04:31:41,292 INFO L153 SettingsManager]: * Use SBE=true [2023-11-30 04:31:41,293 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-30 04:31:41,293 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-30 04:31:41,293 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-30 04:31:41,294 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-30 04:31:41,294 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-30 04:31:41,294 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-30 04:31:41,295 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-30 04:31:41,295 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-30 04:31:41,295 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-30 04:31:41,296 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-30 04:31:41,296 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-30 04:31:41,296 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-30 04:31:41,297 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-30 04:31:41,297 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-30 04:31:41,297 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-11-30 04:31:41,298 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-30 04:31:41,298 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-30 04:31:41,298 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-30 04:31:41,299 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-30 04:31:41,299 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-30 04:31:41,299 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-30 04:31:41,300 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-30 04:31:41,300 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-30 04:31:41,300 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-30 04:31:41,301 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-11-30 04:31:41,540 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-30 04:31:41,563 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-30 04:31:41,565 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-30 04:31:41,567 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-30 04:31:41,567 INFO L274 PluginConnector]: CDTParser initialized [2023-11-30 04:31:41,568 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread-ext/26_stack_cas_longest-1.i [2023-11-30 04:31:42,661 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-30 04:31:42,909 INFO L384 CDTParser]: Found 1 translation units. [2023-11-30 04:31:42,910 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread-ext/26_stack_cas_longest-1.i [2023-11-30 04:31:42,928 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94f8151dc/7a5feda82c5645e8b014fddff7941d53/FLAG10d738ce6 [2023-11-30 04:31:43,250 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94f8151dc/7a5feda82c5645e8b014fddff7941d53 [2023-11-30 04:31:43,252 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-30 04:31:43,253 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-11-30 04:31:43,254 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-30 04:31:43,254 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-30 04:31:43,260 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-30 04:31:43,261 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,262 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68dd099c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43, skipping insertion in model container [2023-11-30 04:31:43,263 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,304 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-30 04:31:43,604 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-30 04:31:43,613 INFO L202 MainTranslator]: Completed pre-run [2023-11-30 04:31:43,672 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-30 04:31:43,700 WARN L675 CHandler]: The function __VERIFIER_atomic_begin is called, but not defined or handled by StandardFunctionHandler. [2023-11-30 04:31:43,700 WARN L675 CHandler]: The function __VERIFIER_atomic_end is called, but not defined or handled by StandardFunctionHandler. [2023-11-30 04:31:43,706 INFO L206 MainTranslator]: Completed translation [2023-11-30 04:31:43,708 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43 WrapperNode [2023-11-30 04:31:43,708 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-30 04:31:43,709 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-30 04:31:43,709 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-30 04:31:43,709 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-30 04:31:43,714 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,741 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,773 INFO L138 Inliner]: procedures = 179, calls = 50, calls flagged for inlining = 17, calls inlined = 20, statements flattened = 194 [2023-11-30 04:31:43,774 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-30 04:31:43,775 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-30 04:31:43,775 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-30 04:31:43,775 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-30 04:31:43,782 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,782 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,800 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,800 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,805 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,808 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,809 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,825 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,828 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-30 04:31:43,828 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-30 04:31:43,828 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-30 04:31:43,829 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-30 04:31:43,829 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43" (1/1) ... [2023-11-30 04:31:43,833 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-30 04:31:43,846 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-11-30 04:31:43,861 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) [2023-11-30 04:31:43,890 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 [2023-11-30 04:31:43,897 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-30 04:31:43,898 INFO L130 BoogieDeclarations]: Found specification of procedure thr1 [2023-11-30 04:31:43,898 INFO L138 BoogieDeclarations]: Found implementation of procedure thr1 [2023-11-30 04:31:43,898 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-30 04:31:43,898 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2023-11-30 04:31:43,899 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-30 04:31:43,899 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-30 04:31:43,899 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-30 04:31:43,899 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-30 04:31:43,899 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2023-11-30 04:31:43,899 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-30 04:31:43,899 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-30 04:31:43,901 WARN L213 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-11-30 04:31:44,032 INFO L241 CfgBuilder]: Building ICFG [2023-11-30 04:31:44,034 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-30 04:31:44,373 INFO L282 CfgBuilder]: Performing block encoding [2023-11-30 04:31:44,602 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-30 04:31:44,603 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-30 04:31:44,604 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 04:31:44 BoogieIcfgContainer [2023-11-30 04:31:44,604 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-30 04:31:44,606 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-30 04:31:44,606 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-30 04:31:44,609 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-30 04:31:44,609 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 04:31:43" (1/3) ... [2023-11-30 04:31:44,610 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10120c14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 04:31:44, skipping insertion in model container [2023-11-30 04:31:44,610 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 04:31:43" (2/3) ... [2023-11-30 04:31:44,610 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10120c14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 04:31:44, skipping insertion in model container [2023-11-30 04:31:44,611 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 04:31:44" (3/3) ... [2023-11-30 04:31:44,612 INFO L112 eAbstractionObserver]: Analyzing ICFG 26_stack_cas_longest-1.i [2023-11-30 04:31:44,628 INFO L197 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-30 04:31:44,629 INFO L156 ceAbstractionStarter]: Applying trace abstraction to program that has 40 error locations. [2023-11-30 04:31:44,629 INFO L508 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-11-30 04:31:44,718 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-11-30 04:31:44,752 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 149 places, 157 transitions, 318 flow [2023-11-30 04:31:44,821 INFO L124 PetriNetUnfolderBase]: 12/170 cut-off events. [2023-11-30 04:31:44,821 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-30 04:31:44,834 INFO L83 FinitePrefix]: Finished finitePrefix Result has 174 conditions, 170 events. 12/170 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 329 event pairs, 0 based on Foata normal form. 0/114 useless extension candidates. Maximal degree in co-relation 134. Up to 4 conditions per place. [2023-11-30 04:31:44,834 INFO L82 GeneralOperation]: Start removeDead. Operand has 149 places, 157 transitions, 318 flow [2023-11-30 04:31:44,846 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 149 places, 157 transitions, 318 flow [2023-11-30 04:31:44,854 INFO L361 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-30 04:31:44,859 INFO L362 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=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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;@4c603946, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-30 04:31:44,859 INFO L363 AbstractCegarLoop]: Starting to check reachability of 79 error locations. [2023-11-30 04:31:44,867 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-30 04:31:44,867 INFO L124 PetriNetUnfolderBase]: 1/29 cut-off events. [2023-11-30 04:31:44,867 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-30 04:31:44,867 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:31:44,868 INFO L232 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:31:44,868 INFO L425 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 76 more)] === [2023-11-30 04:31:44,872 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:31:44,873 INFO L85 PathProgramCache]: Analyzing trace with hash -2139027774, now seen corresponding path program 1 times [2023-11-30 04:31:44,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:31:44,881 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276477387] [2023-11-30 04:31:44,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:31:44,882 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:31:44,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-30 04:31:45,161 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-30 04:31:45,163 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-30 04:31:45,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276477387] [2023-11-30 04:31:45,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1276477387] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-30 04:31:45,164 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-30 04:31:45,164 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-30 04:31:45,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869601279] [2023-11-30 04:31:45,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-30 04:31:45,174 INFO L576 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-30 04:31:45,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-30 04:31:45,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-30 04:31:45,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-30 04:31:45,207 INFO L497 CegarLoopForPetriNet]: Number of universal loopers: 87 out of 157 [2023-11-30 04:31:45,211 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 149 places, 157 transitions, 318 flow. Second operand has 3 states, 3 states have (on average 90.0) internal successors, (270), 3 states have internal predecessors, (270), 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) [2023-11-30 04:31:45,212 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-30 04:31:45,212 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 87 of 157 [2023-11-30 04:31:45,212 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-30 04:31:45,512 INFO L124 PetriNetUnfolderBase]: 171/713 cut-off events. [2023-11-30 04:31:45,513 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-30 04:31:45,517 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1085 conditions, 713 events. 171/713 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 35. Compared 3747 event pairs, 82 based on Foata normal form. 68/513 useless extension candidates. Maximal degree in co-relation 1039. Up to 186 conditions per place. [2023-11-30 04:31:45,524 INFO L140 encePairwiseOnDemand]: 134/157 looper letters, 74 selfloop transitions, 4 changer transitions 0/161 dead transitions. [2023-11-30 04:31:45,524 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 130 places, 161 transitions, 482 flow [2023-11-30 04:31:45,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-30 04:31:45,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-30 04:31:45,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 372 transitions. [2023-11-30 04:31:45,541 INFO L542 CegarLoopForPetriNet]: DFA transition density 0.7898089171974523 [2023-11-30 04:31:45,542 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 372 transitions. [2023-11-30 04:31:45,542 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 372 transitions. [2023-11-30 04:31:45,544 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-30 04:31:45,546 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 372 transitions. [2023-11-30 04:31:45,551 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 124.0) internal successors, (372), 3 states have internal predecessors, (372), 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) [2023-11-30 04:31:45,555 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 157.0) internal successors, (628), 4 states have internal predecessors, (628), 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) [2023-11-30 04:31:45,555 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 157.0) internal successors, (628), 4 states have internal predecessors, (628), 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) [2023-11-30 04:31:45,558 INFO L307 CegarLoopForPetriNet]: 149 programPoint places, -19 predicate places. [2023-11-30 04:31:45,559 INFO L500 AbstractCegarLoop]: Abstraction has has 130 places, 161 transitions, 482 flow [2023-11-30 04:31:45,559 INFO L501 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 90.0) internal successors, (270), 3 states have internal predecessors, (270), 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) [2023-11-30 04:31:45,559 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:31:45,559 INFO L232 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:31:45,559 WARN L482 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-30 04:31:45,559 INFO L425 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 76 more)] === [2023-11-30 04:31:45,560 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:31:45,560 INFO L85 PathProgramCache]: Analyzing trace with hash -2139027773, now seen corresponding path program 1 times [2023-11-30 04:31:45,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:31:45,561 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035463548] [2023-11-30 04:31:45,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:31:45,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:31:45,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-30 04:31:45,755 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-30 04:31:45,755 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-30 04:31:45,756 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035463548] [2023-11-30 04:31:45,756 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1035463548] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-30 04:31:45,756 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-30 04:31:45,756 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-30 04:31:45,757 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209555585] [2023-11-30 04:31:45,757 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-30 04:31:45,758 INFO L576 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-30 04:31:45,758 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-30 04:31:45,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-30 04:31:45,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-30 04:31:45,760 INFO L497 CegarLoopForPetriNet]: Number of universal loopers: 91 out of 157 [2023-11-30 04:31:45,761 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 130 places, 161 transitions, 482 flow. Second operand has 3 states, 3 states have (on average 93.66666666666667) internal successors, (281), 3 states have internal predecessors, (281), 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) [2023-11-30 04:31:45,761 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-30 04:31:45,761 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 91 of 157 [2023-11-30 04:31:45,761 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-30 04:31:45,891 INFO L124 PetriNetUnfolderBase]: 110/501 cut-off events. [2023-11-30 04:31:45,891 INFO L125 PetriNetUnfolderBase]: For 55/77 co-relation queries the response was YES. [2023-11-30 04:31:45,892 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1001 conditions, 501 events. 110/501 cut-off events. For 55/77 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 2133 event pairs, 56 based on Foata normal form. 0/347 useless extension candidates. Maximal degree in co-relation 945. Up to 235 conditions per place. [2023-11-30 04:31:45,895 INFO L140 encePairwiseOnDemand]: 155/157 looper letters, 69 selfloop transitions, 1 changer transitions 0/159 dead transitions. [2023-11-30 04:31:45,896 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 131 places, 159 transitions, 614 flow [2023-11-30 04:31:45,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-30 04:31:45,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-30 04:31:45,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 318 transitions. [2023-11-30 04:31:45,898 INFO L542 CegarLoopForPetriNet]: DFA transition density 0.6751592356687898 [2023-11-30 04:31:45,898 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 318 transitions. [2023-11-30 04:31:45,898 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 318 transitions. [2023-11-30 04:31:45,898 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-30 04:31:45,898 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 318 transitions. [2023-11-30 04:31:45,899 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 106.0) internal successors, (318), 3 states have internal predecessors, (318), 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) [2023-11-30 04:31:45,902 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 157.0) internal successors, (628), 4 states have internal predecessors, (628), 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) [2023-11-30 04:31:45,902 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 157.0) internal successors, (628), 4 states have internal predecessors, (628), 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) [2023-11-30 04:31:45,905 INFO L307 CegarLoopForPetriNet]: 149 programPoint places, -18 predicate places. [2023-11-30 04:31:45,905 INFO L500 AbstractCegarLoop]: Abstraction has has 131 places, 159 transitions, 614 flow [2023-11-30 04:31:45,906 INFO L501 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 93.66666666666667) internal successors, (281), 3 states have internal predecessors, (281), 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) [2023-11-30 04:31:45,906 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:31:45,906 INFO L232 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:31:45,906 WARN L482 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-30 04:31:45,906 INFO L425 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 76 more)] === [2023-11-30 04:31:45,907 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:31:45,907 INFO L85 PathProgramCache]: Analyzing trace with hash 654146078, now seen corresponding path program 1 times [2023-11-30 04:31:45,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:31:45,908 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329118874] [2023-11-30 04:31:45,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:31:45,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:31:45,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-30 04:31:46,149 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-30 04:31:46,151 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-30 04:31:46,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329118874] [2023-11-30 04:31:46,152 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [329118874] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-30 04:31:46,153 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-30 04:31:46,153 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-30 04:31:46,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916870205] [2023-11-30 04:31:46,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-30 04:31:46,154 INFO L576 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-30 04:31:46,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-30 04:31:46,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-30 04:31:46,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2023-11-30 04:31:46,159 INFO L497 CegarLoopForPetriNet]: Number of universal loopers: 85 out of 157 [2023-11-30 04:31:46,159 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 131 places, 159 transitions, 614 flow. Second operand has 6 states, 6 states have (on average 87.16666666666667) internal successors, (523), 6 states have internal predecessors, (523), 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) [2023-11-30 04:31:46,160 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-30 04:31:46,160 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 85 of 157 [2023-11-30 04:31:46,161 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-30 04:31:46,380 INFO L124 PetriNetUnfolderBase]: 112/552 cut-off events. [2023-11-30 04:31:46,380 INFO L125 PetriNetUnfolderBase]: For 191/245 co-relation queries the response was YES. [2023-11-30 04:31:46,386 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1363 conditions, 552 events. 112/552 cut-off events. For 191/245 co-relation queries the response was YES. Maximal size of possible extension queue 33. Compared 2696 event pairs, 54 based on Foata normal form. 0/383 useless extension candidates. Maximal degree in co-relation 1293. Up to 252 conditions per place. [2023-11-30 04:31:46,389 INFO L140 encePairwiseOnDemand]: 151/157 looper letters, 97 selfloop transitions, 4 changer transitions 0/182 dead transitions. [2023-11-30 04:31:46,389 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 132 places, 182 transitions, 948 flow [2023-11-30 04:31:46,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-30 04:31:46,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-30 04:31:46,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 415 transitions. [2023-11-30 04:31:46,391 INFO L542 CegarLoopForPetriNet]: DFA transition density 0.660828025477707 [2023-11-30 04:31:46,391 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 415 transitions. [2023-11-30 04:31:46,391 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 415 transitions. [2023-11-30 04:31:46,392 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-30 04:31:46,392 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 415 transitions. [2023-11-30 04:31:46,393 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 103.75) internal successors, (415), 4 states have internal predecessors, (415), 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) [2023-11-30 04:31:46,394 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 157.0) internal successors, (785), 5 states have internal predecessors, (785), 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) [2023-11-30 04:31:46,394 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 157.0) internal successors, (785), 5 states have internal predecessors, (785), 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) [2023-11-30 04:31:46,396 INFO L307 CegarLoopForPetriNet]: 149 programPoint places, -17 predicate places. [2023-11-30 04:31:46,396 INFO L500 AbstractCegarLoop]: Abstraction has has 132 places, 182 transitions, 948 flow [2023-11-30 04:31:46,396 INFO L501 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 87.16666666666667) internal successors, (523), 6 states have internal predecessors, (523), 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) [2023-11-30 04:31:46,396 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:31:46,397 INFO L232 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:31:46,397 WARN L482 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-30 04:31:46,397 INFO L425 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 76 more)] === [2023-11-30 04:31:46,398 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:31:46,398 INFO L85 PathProgramCache]: Analyzing trace with hash 654146079, now seen corresponding path program 1 times [2023-11-30 04:31:46,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:31:46,398 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703242740] [2023-11-30 04:31:46,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:31:46,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:31:46,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-30 04:31:46,633 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-30 04:31:46,634 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-30 04:31:46,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703242740] [2023-11-30 04:31:46,634 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [703242740] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-30 04:31:46,634 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-30 04:31:46,634 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-30 04:31:46,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376357294] [2023-11-30 04:31:46,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-30 04:31:46,636 INFO L576 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-30 04:31:46,636 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-30 04:31:46,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-30 04:31:46,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2023-11-30 04:31:46,638 INFO L497 CegarLoopForPetriNet]: Number of universal loopers: 83 out of 157 [2023-11-30 04:31:46,639 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 132 places, 182 transitions, 948 flow. Second operand has 6 states, 6 states have (on average 85.16666666666667) internal successors, (511), 6 states have internal predecessors, (511), 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) [2023-11-30 04:31:46,639 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-30 04:31:46,639 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 83 of 157 [2023-11-30 04:31:46,639 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-30 04:31:46,826 INFO L124 PetriNetUnfolderBase]: 110/546 cut-off events. [2023-11-30 04:31:46,826 INFO L125 PetriNetUnfolderBase]: For 385/461 co-relation queries the response was YES. [2023-11-30 04:31:46,827 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1616 conditions, 546 events. 110/546 cut-off events. For 385/461 co-relation queries the response was YES. Maximal size of possible extension queue 33. Compared 2664 event pairs, 52 based on Foata normal form. 0/382 useless extension candidates. Maximal degree in co-relation 1533. Up to 246 conditions per place. [2023-11-30 04:31:46,830 INFO L140 encePairwiseOnDemand]: 150/157 looper letters, 97 selfloop transitions, 5 changer transitions 0/181 dead transitions. [2023-11-30 04:31:46,830 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 135 places, 181 transitions, 1140 flow [2023-11-30 04:31:46,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-30 04:31:46,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-30 04:31:46,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 574 transitions. [2023-11-30 04:31:46,832 INFO L542 CegarLoopForPetriNet]: DFA transition density 0.6093418259023354 [2023-11-30 04:31:46,832 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 574 transitions. [2023-11-30 04:31:46,832 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 574 transitions. [2023-11-30 04:31:46,832 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-30 04:31:46,832 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 574 transitions. [2023-11-30 04:31:46,834 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 95.66666666666667) internal successors, (574), 6 states have internal predecessors, (574), 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) [2023-11-30 04:31:46,835 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 157.0) internal successors, (1099), 7 states have internal predecessors, (1099), 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) [2023-11-30 04:31:46,836 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 157.0) internal successors, (1099), 7 states have internal predecessors, (1099), 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) [2023-11-30 04:31:46,836 INFO L307 CegarLoopForPetriNet]: 149 programPoint places, -14 predicate places. [2023-11-30 04:31:46,837 INFO L500 AbstractCegarLoop]: Abstraction has has 135 places, 181 transitions, 1140 flow [2023-11-30 04:31:46,837 INFO L501 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 85.16666666666667) internal successors, (511), 6 states have internal predecessors, (511), 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) [2023-11-30 04:31:46,837 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:31:46,837 INFO L232 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:31:46,838 WARN L482 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-30 04:31:46,838 INFO L425 AbstractCegarLoop]: === Iteration 5 === Targeting thr1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 76 more)] === [2023-11-30 04:31:46,838 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:31:46,838 INFO L85 PathProgramCache]: Analyzing trace with hash 1400017933, now seen corresponding path program 1 times [2023-11-30 04:31:46,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:31:46,838 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70778107] [2023-11-30 04:31:46,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:31:46,839 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:31:46,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-30 04:31:46,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-30 04:31:46,929 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-30 04:31:46,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70778107] [2023-11-30 04:31:46,929 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70778107] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-30 04:31:46,929 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-30 04:31:46,930 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-30 04:31:46,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268587214] [2023-11-30 04:31:46,930 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-30 04:31:46,930 INFO L576 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-30 04:31:46,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-30 04:31:46,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-30 04:31:46,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2023-11-30 04:31:46,932 INFO L497 CegarLoopForPetriNet]: Number of universal loopers: 84 out of 157 [2023-11-30 04:31:46,932 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 135 places, 181 transitions, 1140 flow. Second operand has 6 states, 6 states have (on average 86.33333333333333) internal successors, (518), 6 states have internal predecessors, (518), 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) [2023-11-30 04:31:46,932 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-30 04:31:46,932 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 84 of 157 [2023-11-30 04:31:46,933 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-30 04:31:47,111 INFO L124 PetriNetUnfolderBase]: 100/544 cut-off events. [2023-11-30 04:31:47,112 INFO L125 PetriNetUnfolderBase]: For 663/713 co-relation queries the response was YES. [2023-11-30 04:31:47,113 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1763 conditions, 544 events. 100/544 cut-off events. For 663/713 co-relation queries the response was YES. Maximal size of possible extension queue 28. Compared 2595 event pairs, 26 based on Foata normal form. 2/399 useless extension candidates. Maximal degree in co-relation 1670. Up to 224 conditions per place. [2023-11-30 04:31:47,116 INFO L140 encePairwiseOnDemand]: 149/157 looper letters, 85 selfloop transitions, 10 changer transitions 0/176 dead transitions. [2023-11-30 04:31:47,116 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 136 places, 176 transitions, 1282 flow [2023-11-30 04:31:47,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-30 04:31:47,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-11-30 04:31:47,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 494 transitions. [2023-11-30 04:31:47,118 INFO L542 CegarLoopForPetriNet]: DFA transition density 0.6292993630573248 [2023-11-30 04:31:47,118 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 494 transitions. [2023-11-30 04:31:47,118 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 494 transitions. [2023-11-30 04:31:47,118 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-30 04:31:47,118 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 494 transitions. [2023-11-30 04:31:47,119 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 98.8) internal successors, (494), 5 states have internal predecessors, (494), 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) [2023-11-30 04:31:47,121 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 157.0) internal successors, (942), 6 states have internal predecessors, (942), 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) [2023-11-30 04:31:47,121 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 157.0) internal successors, (942), 6 states have internal predecessors, (942), 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) [2023-11-30 04:31:47,122 INFO L307 CegarLoopForPetriNet]: 149 programPoint places, -13 predicate places. [2023-11-30 04:31:47,122 INFO L500 AbstractCegarLoop]: Abstraction has has 136 places, 176 transitions, 1282 flow [2023-11-30 04:31:47,122 INFO L501 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 86.33333333333333) internal successors, (518), 6 states have internal predecessors, (518), 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) [2023-11-30 04:31:47,122 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:31:47,123 INFO L232 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:31:47,123 WARN L482 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-30 04:31:47,123 INFO L425 AbstractCegarLoop]: === Iteration 6 === Targeting thr1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 76 more)] === [2023-11-30 04:31:47,123 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:31:47,123 INFO L85 PathProgramCache]: Analyzing trace with hash 1400017934, now seen corresponding path program 1 times [2023-11-30 04:31:47,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:31:47,124 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025983499] [2023-11-30 04:31:47,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:31:47,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:31:47,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-30 04:31:47,273 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-30 04:31:47,274 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-30 04:31:47,274 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025983499] [2023-11-30 04:31:47,274 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1025983499] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-30 04:31:47,274 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-30 04:31:47,274 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-30 04:31:47,274 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976726758] [2023-11-30 04:31:47,275 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-30 04:31:47,275 INFO L576 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-30 04:31:47,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-30 04:31:47,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-30 04:31:47,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-30 04:31:47,276 INFO L497 CegarLoopForPetriNet]: Number of universal loopers: 86 out of 157 [2023-11-30 04:31:47,277 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 136 places, 176 transitions, 1282 flow. Second operand has 5 states, 5 states have (on average 88.6) internal successors, (443), 5 states have internal predecessors, (443), 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) [2023-11-30 04:31:47,277 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-30 04:31:47,277 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 86 of 157 [2023-11-30 04:31:47,277 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-30 04:31:47,421 INFO L124 PetriNetUnfolderBase]: 91/518 cut-off events. [2023-11-30 04:31:47,421 INFO L125 PetriNetUnfolderBase]: For 974/1038 co-relation queries the response was YES. [2023-11-30 04:31:47,422 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1830 conditions, 518 events. 91/518 cut-off events. For 974/1038 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 2389 event pairs, 22 based on Foata normal form. 2/392 useless extension candidates. Maximal degree in co-relation 1724. Up to 197 conditions per place. [2023-11-30 04:31:47,425 INFO L140 encePairwiseOnDemand]: 149/157 looper letters, 83 selfloop transitions, 4 changer transitions 0/167 dead transitions. [2023-11-30 04:31:47,425 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 136 places, 167 transitions, 1352 flow [2023-11-30 04:31:47,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-30 04:31:47,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-11-30 04:31:47,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 498 transitions. [2023-11-30 04:31:47,427 INFO L542 CegarLoopForPetriNet]: DFA transition density 0.6343949044585987 [2023-11-30 04:31:47,427 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 498 transitions. [2023-11-30 04:31:47,427 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 498 transitions. [2023-11-30 04:31:47,428 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-30 04:31:47,428 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 498 transitions. [2023-11-30 04:31:47,429 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 99.6) internal successors, (498), 5 states have internal predecessors, (498), 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) [2023-11-30 04:31:47,430 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 157.0) internal successors, (942), 6 states have internal predecessors, (942), 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) [2023-11-30 04:31:47,430 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 157.0) internal successors, (942), 6 states have internal predecessors, (942), 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) [2023-11-30 04:31:47,431 INFO L307 CegarLoopForPetriNet]: 149 programPoint places, -13 predicate places. [2023-11-30 04:31:47,431 INFO L500 AbstractCegarLoop]: Abstraction has has 136 places, 167 transitions, 1352 flow [2023-11-30 04:31:47,431 INFO L501 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 88.6) internal successors, (443), 5 states have internal predecessors, (443), 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) [2023-11-30 04:31:47,431 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:31:47,432 INFO L232 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:31:47,432 WARN L482 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-30 04:31:47,432 INFO L425 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 76 more)] === [2023-11-30 04:31:47,432 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:31:47,432 INFO L85 PathProgramCache]: Analyzing trace with hash 405708083, now seen corresponding path program 1 times [2023-11-30 04:31:47,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:31:47,433 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210796841] [2023-11-30 04:31:47,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:31:47,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:31:47,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-30 04:31:47,442 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-11-30 04:31:47,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-30 04:31:47,470 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-11-30 04:31:47,470 INFO L372 BasicCegarLoop]: Counterexample is feasible [2023-11-30 04:31:47,471 INFO L810 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (78 of 79 remaining) [2023-11-30 04:31:47,472 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (77 of 79 remaining) [2023-11-30 04:31:47,475 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (76 of 79 remaining) [2023-11-30 04:31:47,476 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (75 of 79 remaining) [2023-11-30 04:31:47,476 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (74 of 79 remaining) [2023-11-30 04:31:47,476 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (73 of 79 remaining) [2023-11-30 04:31:47,476 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (72 of 79 remaining) [2023-11-30 04:31:47,476 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (71 of 79 remaining) [2023-11-30 04:31:47,476 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (70 of 79 remaining) [2023-11-30 04:31:47,476 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (69 of 79 remaining) [2023-11-30 04:31:47,477 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err9REQUIRES_VIOLATIONMEMORY_DEREFERENCE (68 of 79 remaining) [2023-11-30 04:31:47,477 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err10REQUIRES_VIOLATIONMEMORY_DEREFERENCE (67 of 79 remaining) [2023-11-30 04:31:47,477 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err11REQUIRES_VIOLATIONMEMORY_DEREFERENCE (66 of 79 remaining) [2023-11-30 04:31:47,477 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err12REQUIRES_VIOLATIONMEMORY_DEREFERENCE (65 of 79 remaining) [2023-11-30 04:31:47,477 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err13REQUIRES_VIOLATIONMEMORY_DEREFERENCE (64 of 79 remaining) [2023-11-30 04:31:47,477 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err14REQUIRES_VIOLATIONMEMORY_DEREFERENCE (63 of 79 remaining) [2023-11-30 04:31:47,477 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err15REQUIRES_VIOLATIONMEMORY_DEREFERENCE (62 of 79 remaining) [2023-11-30 04:31:47,477 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err16REQUIRES_VIOLATIONMEMORY_DEREFERENCE (61 of 79 remaining) [2023-11-30 04:31:47,477 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err17REQUIRES_VIOLATIONMEMORY_DEREFERENCE (60 of 79 remaining) [2023-11-30 04:31:47,478 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err18REQUIRES_VIOLATIONMEMORY_DEREFERENCE (59 of 79 remaining) [2023-11-30 04:31:47,478 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err19REQUIRES_VIOLATIONMEMORY_DEREFERENCE (58 of 79 remaining) [2023-11-30 04:31:47,478 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err20REQUIRES_VIOLATIONMEMORY_DEREFERENCE (57 of 79 remaining) [2023-11-30 04:31:47,478 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err21REQUIRES_VIOLATIONMEMORY_DEREFERENCE (56 of 79 remaining) [2023-11-30 04:31:47,478 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err22ASSERT_VIOLATIONARRAY_INDEX (55 of 79 remaining) [2023-11-30 04:31:47,478 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err23REQUIRES_VIOLATIONMEMORY_DEREFERENCE (54 of 79 remaining) [2023-11-30 04:31:47,478 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err24REQUIRES_VIOLATIONMEMORY_DEREFERENCE (53 of 79 remaining) [2023-11-30 04:31:47,478 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err25ASSERT_VIOLATIONARRAY_INDEX (52 of 79 remaining) [2023-11-30 04:31:47,478 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err26REQUIRES_VIOLATIONMEMORY_DEREFERENCE (51 of 79 remaining) [2023-11-30 04:31:47,479 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err27REQUIRES_VIOLATIONMEMORY_DEREFERENCE (50 of 79 remaining) [2023-11-30 04:31:47,479 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err28REQUIRES_VIOLATIONMEMORY_DEREFERENCE (49 of 79 remaining) [2023-11-30 04:31:47,479 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err29REQUIRES_VIOLATIONMEMORY_DEREFERENCE (48 of 79 remaining) [2023-11-30 04:31:47,479 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err30REQUIRES_VIOLATIONMEMORY_DEREFERENCE (47 of 79 remaining) [2023-11-30 04:31:47,480 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err31REQUIRES_VIOLATIONMEMORY_DEREFERENCE (46 of 79 remaining) [2023-11-30 04:31:47,480 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err32REQUIRES_VIOLATIONMEMORY_DEREFERENCE (45 of 79 remaining) [2023-11-30 04:31:47,483 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err33REQUIRES_VIOLATIONMEMORY_DEREFERENCE (44 of 79 remaining) [2023-11-30 04:31:47,484 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err34REQUIRES_VIOLATIONMEMORY_DEREFERENCE (43 of 79 remaining) [2023-11-30 04:31:47,484 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err35REQUIRES_VIOLATIONMEMORY_DEREFERENCE (42 of 79 remaining) [2023-11-30 04:31:47,484 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err36REQUIRES_VIOLATIONMEMORY_DEREFERENCE (41 of 79 remaining) [2023-11-30 04:31:47,484 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err37REQUIRES_VIOLATIONMEMORY_DEREFERENCE (40 of 79 remaining) [2023-11-30 04:31:47,484 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (39 of 79 remaining) [2023-11-30 04:31:47,484 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (38 of 79 remaining) [2023-11-30 04:31:47,484 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (37 of 79 remaining) [2023-11-30 04:31:47,484 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (36 of 79 remaining) [2023-11-30 04:31:47,485 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (35 of 79 remaining) [2023-11-30 04:31:47,485 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (34 of 79 remaining) [2023-11-30 04:31:47,485 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (33 of 79 remaining) [2023-11-30 04:31:47,485 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (32 of 79 remaining) [2023-11-30 04:31:47,486 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (31 of 79 remaining) [2023-11-30 04:31:47,486 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (30 of 79 remaining) [2023-11-30 04:31:47,486 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (29 of 79 remaining) [2023-11-30 04:31:47,486 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err9REQUIRES_VIOLATIONMEMORY_DEREFERENCE (28 of 79 remaining) [2023-11-30 04:31:47,486 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err10REQUIRES_VIOLATIONMEMORY_DEREFERENCE (27 of 79 remaining) [2023-11-30 04:31:47,486 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err11REQUIRES_VIOLATIONMEMORY_DEREFERENCE (26 of 79 remaining) [2023-11-30 04:31:47,486 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err12REQUIRES_VIOLATIONMEMORY_DEREFERENCE (25 of 79 remaining) [2023-11-30 04:31:47,486 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err13REQUIRES_VIOLATIONMEMORY_DEREFERENCE (24 of 79 remaining) [2023-11-30 04:31:47,486 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err14REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 79 remaining) [2023-11-30 04:31:47,486 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err15REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 79 remaining) [2023-11-30 04:31:47,487 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err16REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 79 remaining) [2023-11-30 04:31:47,487 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err17REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 79 remaining) [2023-11-30 04:31:47,487 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err18REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 79 remaining) [2023-11-30 04:31:47,487 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err19REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 79 remaining) [2023-11-30 04:31:47,487 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err20REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 79 remaining) [2023-11-30 04:31:47,487 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err21REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 79 remaining) [2023-11-30 04:31:47,487 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err22ASSERT_VIOLATIONARRAY_INDEX (15 of 79 remaining) [2023-11-30 04:31:47,487 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err23REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 79 remaining) [2023-11-30 04:31:47,487 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err24REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 79 remaining) [2023-11-30 04:31:47,487 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err25ASSERT_VIOLATIONARRAY_INDEX (12 of 79 remaining) [2023-11-30 04:31:47,488 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err26REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 79 remaining) [2023-11-30 04:31:47,488 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err27REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 79 remaining) [2023-11-30 04:31:47,488 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err28REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 79 remaining) [2023-11-30 04:31:47,488 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err29REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 79 remaining) [2023-11-30 04:31:47,488 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err30REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 79 remaining) [2023-11-30 04:31:47,488 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err31REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 79 remaining) [2023-11-30 04:31:47,488 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err32REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 79 remaining) [2023-11-30 04:31:47,488 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err33REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 79 remaining) [2023-11-30 04:31:47,488 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err34REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 79 remaining) [2023-11-30 04:31:47,489 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err35REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 79 remaining) [2023-11-30 04:31:47,489 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err36REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 79 remaining) [2023-11-30 04:31:47,489 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err37REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 79 remaining) [2023-11-30 04:31:47,489 WARN L482 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-30 04:31:47,490 INFO L457 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:31:47,492 WARN L227 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-11-30 04:31:47,492 INFO L508 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-11-30 04:31:47,596 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-11-30 04:31:47,604 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 261 places, 277 transitions, 564 flow [2023-11-30 04:31:47,643 INFO L124 PetriNetUnfolderBase]: 23/305 cut-off events. [2023-11-30 04:31:47,643 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-30 04:31:47,647 INFO L83 FinitePrefix]: Finished finitePrefix Result has 313 conditions, 305 events. 23/305 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 901 event pairs, 0 based on Foata normal form. 0/197 useless extension candidates. Maximal degree in co-relation 253. Up to 6 conditions per place. [2023-11-30 04:31:47,648 INFO L82 GeneralOperation]: Start removeDead. Operand has 261 places, 277 transitions, 564 flow [2023-11-30 04:31:47,655 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 261 places, 277 transitions, 564 flow [2023-11-30 04:31:47,658 INFO L361 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-30 04:31:47,658 INFO L362 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=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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;@4c603946, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-30 04:31:47,658 INFO L363 AbstractCegarLoop]: Starting to check reachability of 117 error locations. [2023-11-30 04:31:47,662 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-30 04:31:47,663 INFO L124 PetriNetUnfolderBase]: 1/29 cut-off events. [2023-11-30 04:31:47,663 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-30 04:31:47,663 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:31:47,663 INFO L232 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:31:47,663 INFO L425 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 114 more)] === [2023-11-30 04:31:47,666 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:31:47,666 INFO L85 PathProgramCache]: Analyzing trace with hash 1440196695, now seen corresponding path program 1 times [2023-11-30 04:31:47,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:31:47,667 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300376975] [2023-11-30 04:31:47,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:31:47,667 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:31:47,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-30 04:31:47,719 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-30 04:31:47,719 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-30 04:31:47,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300376975] [2023-11-30 04:31:47,720 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300376975] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-30 04:31:47,720 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-30 04:31:47,720 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-30 04:31:47,720 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514300046] [2023-11-30 04:31:47,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-30 04:31:47,720 INFO L576 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-30 04:31:47,720 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-30 04:31:47,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-30 04:31:47,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-30 04:31:47,722 INFO L497 CegarLoopForPetriNet]: Number of universal loopers: 153 out of 277 [2023-11-30 04:31:47,722 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 261 places, 277 transitions, 564 flow. Second operand has 3 states, 3 states have (on average 156.0) internal successors, (468), 3 states have internal predecessors, (468), 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) [2023-11-30 04:31:47,722 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-30 04:31:47,722 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 153 of 277 [2023-11-30 04:31:47,723 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-30 04:31:53,065 INFO L124 PetriNetUnfolderBase]: 16804/40963 cut-off events. [2023-11-30 04:31:53,066 INFO L125 PetriNetUnfolderBase]: For 295/295 co-relation queries the response was YES. [2023-11-30 04:31:53,166 INFO L83 FinitePrefix]: Finished finitePrefix Result has 65682 conditions, 40963 events. 16804/40963 cut-off events. For 295/295 co-relation queries the response was YES. Maximal size of possible extension queue 1276. Compared 462757 event pairs, 6551 based on Foata normal form. 3825/27304 useless extension candidates. Maximal degree in co-relation 28286. Up to 13782 conditions per place. [2023-11-30 04:31:53,385 INFO L140 encePairwiseOnDemand]: 236/277 looper letters, 154 selfloop transitions, 6 changer transitions 0/307 dead transitions. [2023-11-30 04:31:53,385 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 227 places, 307 transitions, 949 flow [2023-11-30 04:31:53,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-30 04:31:53,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-30 04:31:53,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 688 transitions. [2023-11-30 04:31:53,387 INFO L542 CegarLoopForPetriNet]: DFA transition density 0.8279181708784596 [2023-11-30 04:31:53,387 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 688 transitions. [2023-11-30 04:31:53,387 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 688 transitions. [2023-11-30 04:31:53,388 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-30 04:31:53,388 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 688 transitions. [2023-11-30 04:31:53,389 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 229.33333333333334) internal successors, (688), 3 states have internal predecessors, (688), 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) [2023-11-30 04:31:53,391 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 277.0) internal successors, (1108), 4 states have internal predecessors, (1108), 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) [2023-11-30 04:31:53,391 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 277.0) internal successors, (1108), 4 states have internal predecessors, (1108), 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) [2023-11-30 04:31:53,392 INFO L307 CegarLoopForPetriNet]: 261 programPoint places, -34 predicate places. [2023-11-30 04:31:53,392 INFO L500 AbstractCegarLoop]: Abstraction has has 227 places, 307 transitions, 949 flow [2023-11-30 04:31:53,393 INFO L501 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 156.0) internal successors, (468), 3 states have internal predecessors, (468), 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) [2023-11-30 04:31:53,393 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:31:53,393 INFO L232 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:31:53,393 WARN L482 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-30 04:31:53,393 INFO L425 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 114 more)] === [2023-11-30 04:31:53,394 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:31:53,394 INFO L85 PathProgramCache]: Analyzing trace with hash 1440196696, now seen corresponding path program 1 times [2023-11-30 04:31:53,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:31:53,394 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829073023] [2023-11-30 04:31:53,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:31:53,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:31:53,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-30 04:31:53,438 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-30 04:31:53,438 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-30 04:31:53,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829073023] [2023-11-30 04:31:53,439 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829073023] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-30 04:31:53,439 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-30 04:31:53,439 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-30 04:31:53,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495898413] [2023-11-30 04:31:53,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-30 04:31:53,439 INFO L576 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-30 04:31:53,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-30 04:31:53,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-30 04:31:53,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-30 04:31:53,441 INFO L497 CegarLoopForPetriNet]: Number of universal loopers: 160 out of 277 [2023-11-30 04:31:53,441 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 227 places, 307 transitions, 949 flow. Second operand has 3 states, 3 states have (on average 162.66666666666666) internal successors, (488), 3 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-30 04:31:53,441 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-30 04:31:53,441 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 160 of 277 [2023-11-30 04:31:53,441 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-30 04:31:56,907 INFO L124 PetriNetUnfolderBase]: 12632/30406 cut-off events. [2023-11-30 04:31:56,907 INFO L125 PetriNetUnfolderBase]: For 3250/5178 co-relation queries the response was YES. [2023-11-30 04:31:56,968 INFO L83 FinitePrefix]: Finished finitePrefix Result has 66119 conditions, 30406 events. 12632/30406 cut-off events. For 3250/5178 co-relation queries the response was YES. Maximal size of possible extension queue 958. Compared 322652 event pairs, 5090 based on Foata normal form. 0/18979 useless extension candidates. Maximal degree in co-relation 30015. Up to 17268 conditions per place. [2023-11-30 04:31:57,145 INFO L140 encePairwiseOnDemand]: 275/277 looper letters, 144 selfloop transitions, 1 changer transitions 0/305 dead transitions. [2023-11-30 04:31:57,145 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 228 places, 305 transitions, 1231 flow [2023-11-30 04:31:57,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-30 04:31:57,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-30 04:31:57,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 560 transitions. [2023-11-30 04:31:57,148 INFO L542 CegarLoopForPetriNet]: DFA transition density 0.6738868832731648 [2023-11-30 04:31:57,148 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 560 transitions. [2023-11-30 04:31:57,148 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 560 transitions. [2023-11-30 04:31:57,148 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-30 04:31:57,148 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 560 transitions. [2023-11-30 04:31:57,149 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 186.66666666666666) internal successors, (560), 3 states have internal predecessors, (560), 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) [2023-11-30 04:31:57,150 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 277.0) internal successors, (1108), 4 states have internal predecessors, (1108), 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) [2023-11-30 04:31:57,151 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 277.0) internal successors, (1108), 4 states have internal predecessors, (1108), 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) [2023-11-30 04:31:57,153 INFO L307 CegarLoopForPetriNet]: 261 programPoint places, -33 predicate places. [2023-11-30 04:31:57,153 INFO L500 AbstractCegarLoop]: Abstraction has has 228 places, 305 transitions, 1231 flow [2023-11-30 04:31:57,153 INFO L501 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 162.66666666666666) internal successors, (488), 3 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-30 04:31:57,154 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:31:57,154 INFO L232 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:31:57,154 WARN L482 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-30 04:31:57,154 INFO L425 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 114 more)] === [2023-11-30 04:31:57,154 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:31:57,154 INFO L85 PathProgramCache]: Analyzing trace with hash -1822362506, now seen corresponding path program 1 times [2023-11-30 04:31:57,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:31:57,156 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936021368] [2023-11-30 04:31:57,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:31:57,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:31:57,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-30 04:31:57,289 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-30 04:31:57,290 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-30 04:31:57,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936021368] [2023-11-30 04:31:57,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936021368] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-30 04:31:57,290 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-30 04:31:57,290 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-30 04:31:57,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136992304] [2023-11-30 04:31:57,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-30 04:31:57,291 INFO L576 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-30 04:31:57,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-30 04:31:57,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-30 04:31:57,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2023-11-30 04:31:57,293 INFO L497 CegarLoopForPetriNet]: Number of universal loopers: 147 out of 277 [2023-11-30 04:31:57,294 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 228 places, 305 transitions, 1231 flow. Second operand has 6 states, 6 states have (on average 149.16666666666666) internal successors, (895), 6 states have internal predecessors, (895), 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) [2023-11-30 04:31:57,294 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-30 04:31:57,294 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 147 of 277 [2023-11-30 04:31:57,294 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-30 04:32:02,460 INFO L124 PetriNetUnfolderBase]: 18682/46987 cut-off events. [2023-11-30 04:32:02,461 INFO L125 PetriNetUnfolderBase]: For 13396/19968 co-relation queries the response was YES. [2023-11-30 04:32:02,574 INFO L83 FinitePrefix]: Finished finitePrefix Result has 127272 conditions, 46987 events. 18682/46987 cut-off events. For 13396/19968 co-relation queries the response was YES. Maximal size of possible extension queue 1598. Compared 559545 event pairs, 4121 based on Foata normal form. 39/30254 useless extension candidates. Maximal degree in co-relation 75070. Up to 25235 conditions per place. [2023-11-30 04:32:02,871 INFO L140 encePairwiseOnDemand]: 258/277 looper letters, 271 selfloop transitions, 19 changer transitions 0/431 dead transitions. [2023-11-30 04:32:02,872 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 229 places, 431 transitions, 2532 flow [2023-11-30 04:32:02,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-30 04:32:02,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-30 04:32:02,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1051 transitions. [2023-11-30 04:32:02,880 INFO L542 CegarLoopForPetriNet]: DFA transition density 0.6323706377858003 [2023-11-30 04:32:02,880 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1051 transitions. [2023-11-30 04:32:02,880 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1051 transitions. [2023-11-30 04:32:02,883 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-30 04:32:02,883 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1051 transitions. [2023-11-30 04:32:02,887 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 175.16666666666666) internal successors, (1051), 6 states have internal predecessors, (1051), 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) [2023-11-30 04:32:02,889 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 277.0) internal successors, (1939), 7 states have internal predecessors, (1939), 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) [2023-11-30 04:32:02,890 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 277.0) internal successors, (1939), 7 states have internal predecessors, (1939), 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) [2023-11-30 04:32:02,891 INFO L307 CegarLoopForPetriNet]: 261 programPoint places, -32 predicate places. [2023-11-30 04:32:02,891 INFO L500 AbstractCegarLoop]: Abstraction has has 229 places, 431 transitions, 2532 flow [2023-11-30 04:32:02,891 INFO L501 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 149.16666666666666) internal successors, (895), 6 states have internal predecessors, (895), 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) [2023-11-30 04:32:02,892 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:32:02,892 INFO L232 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:32:02,892 WARN L482 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-30 04:32:02,892 INFO L425 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 114 more)] === [2023-11-30 04:32:02,893 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:32:02,893 INFO L85 PathProgramCache]: Analyzing trace with hash -1613601181, now seen corresponding path program 1 times [2023-11-30 04:32:02,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:32:02,893 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589834396] [2023-11-30 04:32:02,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:32:02,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:32:02,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-30 04:32:03,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-30 04:32:03,006 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-30 04:32:03,006 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589834396] [2023-11-30 04:32:03,006 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589834396] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-30 04:32:03,006 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-30 04:32:03,006 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-30 04:32:03,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876591600] [2023-11-30 04:32:03,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-30 04:32:03,007 INFO L576 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-30 04:32:03,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-30 04:32:03,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-30 04:32:03,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-30 04:32:03,010 INFO L497 CegarLoopForPetriNet]: Number of universal loopers: 150 out of 277 [2023-11-30 04:32:03,010 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 229 places, 431 transitions, 2532 flow. Second operand has 5 states, 5 states have (on average 152.6) internal successors, (763), 5 states have internal predecessors, (763), 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) [2023-11-30 04:32:03,010 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-30 04:32:03,011 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 150 of 277 [2023-11-30 04:32:03,011 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-30 04:32:08,076 INFO L124 PetriNetUnfolderBase]: 16294/42323 cut-off events. [2023-11-30 04:32:08,076 INFO L125 PetriNetUnfolderBase]: For 26200/39538 co-relation queries the response was YES. [2023-11-30 04:32:08,192 INFO L83 FinitePrefix]: Finished finitePrefix Result has 137015 conditions, 42323 events. 16294/42323 cut-off events. For 26200/39538 co-relation queries the response was YES. Maximal size of possible extension queue 1307. Compared 502357 event pairs, 3820 based on Foata normal form. 688/29146 useless extension candidates. Maximal degree in co-relation 80029. Up to 21744 conditions per place. [2023-11-30 04:32:08,457 INFO L140 encePairwiseOnDemand]: 257/277 looper letters, 304 selfloop transitions, 6 changer transitions 0/452 dead transitions. [2023-11-30 04:32:08,457 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 225 places, 452 transitions, 3312 flow [2023-11-30 04:32:08,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-30 04:32:08,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-11-30 04:32:08,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 899 transitions. [2023-11-30 04:32:08,459 INFO L542 CegarLoopForPetriNet]: DFA transition density 0.6490974729241877 [2023-11-30 04:32:08,459 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 899 transitions. [2023-11-30 04:32:08,459 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 899 transitions. [2023-11-30 04:32:08,460 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-30 04:32:08,460 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 899 transitions. [2023-11-30 04:32:08,462 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 179.8) internal successors, (899), 5 states have internal predecessors, (899), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-30 04:32:08,464 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 277.0) internal successors, (1662), 6 states have internal predecessors, (1662), 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) [2023-11-30 04:32:08,464 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 277.0) internal successors, (1662), 6 states have internal predecessors, (1662), 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) [2023-11-30 04:32:08,465 INFO L307 CegarLoopForPetriNet]: 261 programPoint places, -36 predicate places. [2023-11-30 04:32:08,465 INFO L500 AbstractCegarLoop]: Abstraction has has 225 places, 452 transitions, 3312 flow [2023-11-30 04:32:08,465 INFO L501 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 152.6) internal successors, (763), 5 states have internal predecessors, (763), 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) [2023-11-30 04:32:08,465 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:32:08,465 INFO L232 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:32:08,465 WARN L482 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-30 04:32:08,466 INFO L425 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 114 more)] === [2023-11-30 04:32:08,466 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:32:08,466 INFO L85 PathProgramCache]: Analyzing trace with hash -1523270030, now seen corresponding path program 1 times [2023-11-30 04:32:08,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:32:08,466 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971126246] [2023-11-30 04:32:08,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:32:08,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:32:08,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-30 04:32:08,477 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-11-30 04:32:08,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-30 04:32:08,489 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-11-30 04:32:08,489 INFO L372 BasicCegarLoop]: Counterexample is feasible [2023-11-30 04:32:08,489 INFO L810 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (116 of 117 remaining) [2023-11-30 04:32:08,489 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (115 of 117 remaining) [2023-11-30 04:32:08,490 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (114 of 117 remaining) [2023-11-30 04:32:08,490 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (113 of 117 remaining) [2023-11-30 04:32:08,490 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (112 of 117 remaining) [2023-11-30 04:32:08,490 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (111 of 117 remaining) [2023-11-30 04:32:08,490 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (110 of 117 remaining) [2023-11-30 04:32:08,490 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (109 of 117 remaining) [2023-11-30 04:32:08,490 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (108 of 117 remaining) [2023-11-30 04:32:08,490 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (107 of 117 remaining) [2023-11-30 04:32:08,490 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err9REQUIRES_VIOLATIONMEMORY_DEREFERENCE (106 of 117 remaining) [2023-11-30 04:32:08,490 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err10REQUIRES_VIOLATIONMEMORY_DEREFERENCE (105 of 117 remaining) [2023-11-30 04:32:08,491 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err11REQUIRES_VIOLATIONMEMORY_DEREFERENCE (104 of 117 remaining) [2023-11-30 04:32:08,491 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err12REQUIRES_VIOLATIONMEMORY_DEREFERENCE (103 of 117 remaining) [2023-11-30 04:32:08,491 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err13REQUIRES_VIOLATIONMEMORY_DEREFERENCE (102 of 117 remaining) [2023-11-30 04:32:08,491 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err14REQUIRES_VIOLATIONMEMORY_DEREFERENCE (101 of 117 remaining) [2023-11-30 04:32:08,491 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err15REQUIRES_VIOLATIONMEMORY_DEREFERENCE (100 of 117 remaining) [2023-11-30 04:32:08,491 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err16REQUIRES_VIOLATIONMEMORY_DEREFERENCE (99 of 117 remaining) [2023-11-30 04:32:08,491 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err17REQUIRES_VIOLATIONMEMORY_DEREFERENCE (98 of 117 remaining) [2023-11-30 04:32:08,491 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err18REQUIRES_VIOLATIONMEMORY_DEREFERENCE (97 of 117 remaining) [2023-11-30 04:32:08,491 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err19REQUIRES_VIOLATIONMEMORY_DEREFERENCE (96 of 117 remaining) [2023-11-30 04:32:08,492 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err20REQUIRES_VIOLATIONMEMORY_DEREFERENCE (95 of 117 remaining) [2023-11-30 04:32:08,492 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err21REQUIRES_VIOLATIONMEMORY_DEREFERENCE (94 of 117 remaining) [2023-11-30 04:32:08,492 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err22ASSERT_VIOLATIONARRAY_INDEX (93 of 117 remaining) [2023-11-30 04:32:08,492 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err23REQUIRES_VIOLATIONMEMORY_DEREFERENCE (92 of 117 remaining) [2023-11-30 04:32:08,492 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err24REQUIRES_VIOLATIONMEMORY_DEREFERENCE (91 of 117 remaining) [2023-11-30 04:32:08,492 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err25ASSERT_VIOLATIONARRAY_INDEX (90 of 117 remaining) [2023-11-30 04:32:08,492 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err26REQUIRES_VIOLATIONMEMORY_DEREFERENCE (89 of 117 remaining) [2023-11-30 04:32:08,492 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err27REQUIRES_VIOLATIONMEMORY_DEREFERENCE (88 of 117 remaining) [2023-11-30 04:32:08,492 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err28REQUIRES_VIOLATIONMEMORY_DEREFERENCE (87 of 117 remaining) [2023-11-30 04:32:08,493 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err29REQUIRES_VIOLATIONMEMORY_DEREFERENCE (86 of 117 remaining) [2023-11-30 04:32:08,493 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err30REQUIRES_VIOLATIONMEMORY_DEREFERENCE (85 of 117 remaining) [2023-11-30 04:32:08,493 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err31REQUIRES_VIOLATIONMEMORY_DEREFERENCE (84 of 117 remaining) [2023-11-30 04:32:08,493 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err32REQUIRES_VIOLATIONMEMORY_DEREFERENCE (83 of 117 remaining) [2023-11-30 04:32:08,493 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err33REQUIRES_VIOLATIONMEMORY_DEREFERENCE (82 of 117 remaining) [2023-11-30 04:32:08,493 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err34REQUIRES_VIOLATIONMEMORY_DEREFERENCE (81 of 117 remaining) [2023-11-30 04:32:08,493 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err35REQUIRES_VIOLATIONMEMORY_DEREFERENCE (80 of 117 remaining) [2023-11-30 04:32:08,493 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err36REQUIRES_VIOLATIONMEMORY_DEREFERENCE (79 of 117 remaining) [2023-11-30 04:32:08,493 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err37REQUIRES_VIOLATIONMEMORY_DEREFERENCE (78 of 117 remaining) [2023-11-30 04:32:08,494 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (77 of 117 remaining) [2023-11-30 04:32:08,494 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (76 of 117 remaining) [2023-11-30 04:32:08,494 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (75 of 117 remaining) [2023-11-30 04:32:08,494 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (74 of 117 remaining) [2023-11-30 04:32:08,494 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (73 of 117 remaining) [2023-11-30 04:32:08,494 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (72 of 117 remaining) [2023-11-30 04:32:08,494 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (71 of 117 remaining) [2023-11-30 04:32:08,494 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (70 of 117 remaining) [2023-11-30 04:32:08,494 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (69 of 117 remaining) [2023-11-30 04:32:08,495 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (68 of 117 remaining) [2023-11-30 04:32:08,495 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (67 of 117 remaining) [2023-11-30 04:32:08,495 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err9REQUIRES_VIOLATIONMEMORY_DEREFERENCE (66 of 117 remaining) [2023-11-30 04:32:08,495 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err10REQUIRES_VIOLATIONMEMORY_DEREFERENCE (65 of 117 remaining) [2023-11-30 04:32:08,495 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err11REQUIRES_VIOLATIONMEMORY_DEREFERENCE (64 of 117 remaining) [2023-11-30 04:32:08,495 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err12REQUIRES_VIOLATIONMEMORY_DEREFERENCE (63 of 117 remaining) [2023-11-30 04:32:08,495 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err13REQUIRES_VIOLATIONMEMORY_DEREFERENCE (62 of 117 remaining) [2023-11-30 04:32:08,495 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err14REQUIRES_VIOLATIONMEMORY_DEREFERENCE (61 of 117 remaining) [2023-11-30 04:32:08,495 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err15REQUIRES_VIOLATIONMEMORY_DEREFERENCE (60 of 117 remaining) [2023-11-30 04:32:08,495 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err16REQUIRES_VIOLATIONMEMORY_DEREFERENCE (59 of 117 remaining) [2023-11-30 04:32:08,496 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err17REQUIRES_VIOLATIONMEMORY_DEREFERENCE (58 of 117 remaining) [2023-11-30 04:32:08,496 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err18REQUIRES_VIOLATIONMEMORY_DEREFERENCE (57 of 117 remaining) [2023-11-30 04:32:08,496 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err19REQUIRES_VIOLATIONMEMORY_DEREFERENCE (56 of 117 remaining) [2023-11-30 04:32:08,496 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err20REQUIRES_VIOLATIONMEMORY_DEREFERENCE (55 of 117 remaining) [2023-11-30 04:32:08,496 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err21REQUIRES_VIOLATIONMEMORY_DEREFERENCE (54 of 117 remaining) [2023-11-30 04:32:08,496 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err22ASSERT_VIOLATIONARRAY_INDEX (53 of 117 remaining) [2023-11-30 04:32:08,496 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err23REQUIRES_VIOLATIONMEMORY_DEREFERENCE (52 of 117 remaining) [2023-11-30 04:32:08,496 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err24REQUIRES_VIOLATIONMEMORY_DEREFERENCE (51 of 117 remaining) [2023-11-30 04:32:08,496 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err25ASSERT_VIOLATIONARRAY_INDEX (50 of 117 remaining) [2023-11-30 04:32:08,497 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err26REQUIRES_VIOLATIONMEMORY_DEREFERENCE (49 of 117 remaining) [2023-11-30 04:32:08,497 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err27REQUIRES_VIOLATIONMEMORY_DEREFERENCE (48 of 117 remaining) [2023-11-30 04:32:08,497 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err28REQUIRES_VIOLATIONMEMORY_DEREFERENCE (47 of 117 remaining) [2023-11-30 04:32:08,497 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err29REQUIRES_VIOLATIONMEMORY_DEREFERENCE (46 of 117 remaining) [2023-11-30 04:32:08,497 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err30REQUIRES_VIOLATIONMEMORY_DEREFERENCE (45 of 117 remaining) [2023-11-30 04:32:08,497 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err31REQUIRES_VIOLATIONMEMORY_DEREFERENCE (44 of 117 remaining) [2023-11-30 04:32:08,497 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err32REQUIRES_VIOLATIONMEMORY_DEREFERENCE (43 of 117 remaining) [2023-11-30 04:32:08,497 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err33REQUIRES_VIOLATIONMEMORY_DEREFERENCE (42 of 117 remaining) [2023-11-30 04:32:08,497 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err34REQUIRES_VIOLATIONMEMORY_DEREFERENCE (41 of 117 remaining) [2023-11-30 04:32:08,497 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err35REQUIRES_VIOLATIONMEMORY_DEREFERENCE (40 of 117 remaining) [2023-11-30 04:32:08,498 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err36REQUIRES_VIOLATIONMEMORY_DEREFERENCE (39 of 117 remaining) [2023-11-30 04:32:08,498 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err37REQUIRES_VIOLATIONMEMORY_DEREFERENCE (38 of 117 remaining) [2023-11-30 04:32:08,498 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (37 of 117 remaining) [2023-11-30 04:32:08,498 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (36 of 117 remaining) [2023-11-30 04:32:08,498 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (35 of 117 remaining) [2023-11-30 04:32:08,498 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (34 of 117 remaining) [2023-11-30 04:32:08,498 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (33 of 117 remaining) [2023-11-30 04:32:08,498 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (32 of 117 remaining) [2023-11-30 04:32:08,498 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (31 of 117 remaining) [2023-11-30 04:32:08,498 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (30 of 117 remaining) [2023-11-30 04:32:08,499 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (29 of 117 remaining) [2023-11-30 04:32:08,499 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err9REQUIRES_VIOLATIONMEMORY_DEREFERENCE (28 of 117 remaining) [2023-11-30 04:32:08,499 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err10REQUIRES_VIOLATIONMEMORY_DEREFERENCE (27 of 117 remaining) [2023-11-30 04:32:08,499 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err11REQUIRES_VIOLATIONMEMORY_DEREFERENCE (26 of 117 remaining) [2023-11-30 04:32:08,499 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err12REQUIRES_VIOLATIONMEMORY_DEREFERENCE (25 of 117 remaining) [2023-11-30 04:32:08,499 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err13REQUIRES_VIOLATIONMEMORY_DEREFERENCE (24 of 117 remaining) [2023-11-30 04:32:08,499 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err14REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 117 remaining) [2023-11-30 04:32:08,499 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err15REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 117 remaining) [2023-11-30 04:32:08,499 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err16REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 117 remaining) [2023-11-30 04:32:08,499 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err17REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 117 remaining) [2023-11-30 04:32:08,500 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err18REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 117 remaining) [2023-11-30 04:32:08,500 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err19REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 117 remaining) [2023-11-30 04:32:08,500 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err20REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 117 remaining) [2023-11-30 04:32:08,500 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err21REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 117 remaining) [2023-11-30 04:32:08,500 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err22ASSERT_VIOLATIONARRAY_INDEX (15 of 117 remaining) [2023-11-30 04:32:08,500 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err23REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 117 remaining) [2023-11-30 04:32:08,500 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err24REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 117 remaining) [2023-11-30 04:32:08,500 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err25ASSERT_VIOLATIONARRAY_INDEX (12 of 117 remaining) [2023-11-30 04:32:08,500 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err26REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 117 remaining) [2023-11-30 04:32:08,501 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err27REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 117 remaining) [2023-11-30 04:32:08,501 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err28REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 117 remaining) [2023-11-30 04:32:08,501 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err29REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 117 remaining) [2023-11-30 04:32:08,501 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err30REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 117 remaining) [2023-11-30 04:32:08,501 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err31REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 117 remaining) [2023-11-30 04:32:08,501 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err32REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 117 remaining) [2023-11-30 04:32:08,501 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err33REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 117 remaining) [2023-11-30 04:32:08,501 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err34REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 117 remaining) [2023-11-30 04:32:08,501 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err35REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 117 remaining) [2023-11-30 04:32:08,502 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err36REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 117 remaining) [2023-11-30 04:32:08,502 INFO L810 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err37REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 117 remaining) [2023-11-30 04:32:08,502 WARN L482 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-30 04:32:08,502 INFO L457 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2023-11-30 04:32:08,503 WARN L227 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-11-30 04:32:08,503 INFO L508 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-11-30 04:32:08,610 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-11-30 04:32:08,613 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 373 places, 397 transitions, 812 flow [2023-11-30 04:32:08,685 INFO L124 PetriNetUnfolderBase]: 34/440 cut-off events. [2023-11-30 04:32:08,686 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-11-30 04:32:08,697 INFO L83 FinitePrefix]: Finished finitePrefix Result has 453 conditions, 440 events. 34/440 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 1652 event pairs, 0 based on Foata normal form. 0/280 useless extension candidates. Maximal degree in co-relation 372. Up to 8 conditions per place. [2023-11-30 04:32:08,698 INFO L82 GeneralOperation]: Start removeDead. Operand has 373 places, 397 transitions, 812 flow [2023-11-30 04:32:08,709 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 373 places, 397 transitions, 812 flow [2023-11-30 04:32:08,711 INFO L361 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-30 04:32:08,711 INFO L362 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=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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;@4c603946, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-30 04:32:08,711 INFO L363 AbstractCegarLoop]: Starting to check reachability of 155 error locations. [2023-11-30 04:32:08,713 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-30 04:32:08,713 INFO L124 PetriNetUnfolderBase]: 1/29 cut-off events. [2023-11-30 04:32:08,713 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-30 04:32:08,713 INFO L224 CegarLoopForPetriNet]: Found error trace [2023-11-30 04:32:08,713 INFO L232 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-30 04:32:08,713 INFO L425 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 152 more)] === [2023-11-30 04:32:08,714 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-30 04:32:08,714 INFO L85 PathProgramCache]: Analyzing trace with hash 848533092, now seen corresponding path program 1 times [2023-11-30 04:32:08,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-30 04:32:08,714 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249823807] [2023-11-30 04:32:08,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-30 04:32:08,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-30 04:32:08,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-30 04:32:08,746 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-30 04:32:08,746 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-30 04:32:08,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249823807] [2023-11-30 04:32:08,746 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249823807] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-30 04:32:08,746 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-30 04:32:08,747 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-30 04:32:08,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178856528] [2023-11-30 04:32:08,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-30 04:32:08,747 INFO L576 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-30 04:32:08,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-30 04:32:08,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-30 04:32:08,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-30 04:32:08,749 INFO L497 CegarLoopForPetriNet]: Number of universal loopers: 219 out of 397 [2023-11-30 04:32:08,749 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 373 places, 397 transitions, 812 flow. Second operand has 3 states, 3 states have (on average 222.0) internal successors, (666), 3 states have internal predecessors, (666), 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) [2023-11-30 04:32:08,749 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-30 04:32:08,749 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 219 of 397 [2023-11-30 04:32:08,750 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand