/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf --traceabstraction.order.of.the.error.locations.to.be.checked INSUFFICIENT_FIRST -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml --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/goblint-regression/28-race_reach_74-tricky_address1_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 16:01:00,881 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 16:01:00,963 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf [2023-08-26 16:01:00,968 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 16:01:00,968 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 16:01:00,998 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 16:01:00,999 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 16:01:00,999 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 16:01:01,000 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 16:01:01,004 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 16:01:01,004 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 16:01:01,004 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 16:01:01,005 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 16:01:01,006 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 16:01:01,006 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 16:01:01,006 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 16:01:01,007 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 16:01:01,007 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 16:01:01,007 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 16:01:01,007 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 16:01:01,008 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 16:01:01,008 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 16:01:01,009 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 16:01:01,009 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 16:01:01,009 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 16:01:01,010 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 16:01:01,010 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 16:01:01,010 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 16:01:01,011 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 16:01:01,011 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 16:01:01,012 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 16:01:01,012 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 16:01:01,012 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 16:01:01,012 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 16:01:01,012 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 16:01:01,013 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> INSUFFICIENT_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 16:01:01,322 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 16:01:01,342 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 16:01:01,345 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 16:01:01,346 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 16:01:01,346 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 16:01:01,347 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_74-tricky_address1_racefree.i [2023-08-26 16:01:02,624 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 16:01:02,871 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 16:01:02,872 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_74-tricky_address1_racefree.i [2023-08-26 16:01:02,900 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/817dc0777/35704f8b6f5246e5accd94478ee93080/FLAG0087e80f1 [2023-08-26 16:01:02,910 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/817dc0777/35704f8b6f5246e5accd94478ee93080 [2023-08-26 16:01:02,912 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 16:01:02,913 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 16:01:02,914 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 16:01:02,914 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 16:01:02,917 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 16:01:02,917 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 04:01:02" (1/1) ... [2023-08-26 16:01:02,918 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5ee608fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:02, skipping insertion in model container [2023-08-26 16:01:02,918 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 04:01:02" (1/1) ... [2023-08-26 16:01:02,964 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 16:01:03,406 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 16:01:03,430 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 16:01:03,458 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 16:01:03,460 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 16:01:03,465 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: unsigned short [736] [2023-08-26 16:01:03,498 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 16:01:03,558 INFO L206 MainTranslator]: Completed translation [2023-08-26 16:01:03,558 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03 WrapperNode [2023-08-26 16:01:03,559 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 16:01:03,560 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 16:01:03,560 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 16:01:03,560 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 16:01:03,565 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03" (1/1) ... [2023-08-26 16:01:03,597 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03" (1/1) ... [2023-08-26 16:01:03,620 INFO L138 Inliner]: procedures = 270, calls = 42, calls flagged for inlining = 7, calls inlined = 8, statements flattened = 199 [2023-08-26 16:01:03,620 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 16:01:03,621 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 16:01:03,621 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 16:01:03,621 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 16:01:03,628 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03" (1/1) ... [2023-08-26 16:01:03,629 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03" (1/1) ... [2023-08-26 16:01:03,632 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03" (1/1) ... [2023-08-26 16:01:03,632 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03" (1/1) ... [2023-08-26 16:01:03,640 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03" (1/1) ... [2023-08-26 16:01:03,644 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03" (1/1) ... [2023-08-26 16:01:03,646 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03" (1/1) ... [2023-08-26 16:01:03,647 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03" (1/1) ... [2023-08-26 16:01:03,650 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 16:01:03,651 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 16:01:03,651 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 16:01:03,651 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 16:01:03,652 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03" (1/1) ... [2023-08-26 16:01:03,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 16:01:03,667 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:03,678 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-26 16:01:03,693 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-26 16:01:03,724 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 16:01:03,724 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 16:01:03,724 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 16:01:03,724 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 16:01:03,724 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 16:01:03,724 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 16:01:03,724 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 16:01:03,725 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 16:01:03,725 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 16:01:03,725 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 16:01:03,725 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 16:01:03,726 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-26 16:01:03,858 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 16:01:03,859 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 16:01:04,111 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 16:01:04,118 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 16:01:04,118 INFO L302 CfgBuilder]: Removed 23 assume(true) statements. [2023-08-26 16:01:04,120 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 04:01:04 BoogieIcfgContainer [2023-08-26 16:01:04,120 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 16:01:04,122 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 16:01:04,122 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 16:01:04,125 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 16:01:04,125 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 04:01:02" (1/3) ... [2023-08-26 16:01:04,126 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18fcec83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 04:01:04, skipping insertion in model container [2023-08-26 16:01:04,126 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:03" (2/3) ... [2023-08-26 16:01:04,126 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18fcec83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 04:01:04, skipping insertion in model container [2023-08-26 16:01:04,126 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 04:01:04" (3/3) ... [2023-08-26 16:01:04,127 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_74-tricky_address1_racefree.i [2023-08-26 16:01:04,142 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 16:01:04,142 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 26 error locations. [2023-08-26 16:01:04,142 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 16:01:04,215 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 16:01:04,247 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 195 places, 225 transitions, 458 flow [2023-08-26 16:01:04,338 INFO L124 PetriNetUnfolderBase]: 48/315 cut-off events. [2023-08-26 16:01:04,338 INFO L125 PetriNetUnfolderBase]: For 1/2 co-relation queries the response was YES. [2023-08-26 16:01:04,345 INFO L83 FinitePrefix]: Finished finitePrefix Result has 321 conditions, 315 events. 48/315 cut-off events. For 1/2 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 1244 event pairs, 0 based on Foata normal form. 0/223 useless extension candidates. Maximal degree in co-relation 177. Up to 8 conditions per place. [2023-08-26 16:01:04,345 INFO L82 GeneralOperation]: Start removeDead. Operand has 195 places, 225 transitions, 458 flow [2023-08-26 16:01:04,350 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 191 places, 220 transitions, 445 flow [2023-08-26 16:01:04,354 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:01:04,361 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 191 places, 220 transitions, 445 flow [2023-08-26 16:01:04,364 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 191 places, 220 transitions, 445 flow [2023-08-26 16:01:04,364 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 191 places, 220 transitions, 445 flow [2023-08-26 16:01:04,455 INFO L124 PetriNetUnfolderBase]: 47/310 cut-off events. [2023-08-26 16:01:04,455 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:01:04,461 INFO L83 FinitePrefix]: Finished finitePrefix Result has 315 conditions, 310 events. 47/310 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 1197 event pairs, 0 based on Foata normal form. 0/218 useless extension candidates. Maximal degree in co-relation 177. Up to 8 conditions per place. [2023-08-26 16:01:04,470 INFO L119 LiptonReduction]: Number of co-enabled transitions 15744 [2023-08-26 16:01:08,126 INFO L134 LiptonReduction]: Checked pairs total: 29669 [2023-08-26 16:01:08,127 INFO L136 LiptonReduction]: Total number of compositions: 211 [2023-08-26 16:01:08,140 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 16:01:08,146 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5c25dfe, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:01:08,146 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 16:01:08,151 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:01:08,152 INFO L124 PetriNetUnfolderBase]: 13/59 cut-off events. [2023-08-26 16:01:08,152 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:01:08,152 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:08,153 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1] [2023-08-26 16:01:08,153 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:08,157 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:08,158 INFO L85 PathProgramCache]: Analyzing trace with hash 1847090313, now seen corresponding path program 1 times [2023-08-26 16:01:08,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:08,166 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564172056] [2023-08-26 16:01:08,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:08,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:08,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:08,419 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 16:01:08,420 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:08,420 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564172056] [2023-08-26 16:01:08,421 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [564172056] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:01:08,421 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:01:08,421 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:01:08,422 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264845631] [2023-08-26 16:01:08,423 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:01:08,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:01:08,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:08,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:01:08,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:01:08,454 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 184 out of 436 [2023-08-26 16:01:08,456 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 91 transitions, 187 flow. Second operand has 3 states, 3 states have (on average 185.66666666666666) internal successors, (557), 3 states have internal predecessors, (557), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:08,457 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:08,457 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 184 of 436 [2023-08-26 16:01:08,458 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:08,703 INFO L124 PetriNetUnfolderBase]: 616/1350 cut-off events. [2023-08-26 16:01:08,704 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:01:08,705 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2569 conditions, 1350 events. 616/1350 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 92. Compared 8595 event pairs, 567 based on Foata normal form. 102/966 useless extension candidates. Maximal degree in co-relation 2496. Up to 1213 conditions per place. [2023-08-26 16:01:08,708 INFO L140 encePairwiseOnDemand]: 404/436 looper letters, 29 selfloop transitions, 2 changer transitions 26/63 dead transitions. [2023-08-26 16:01:08,708 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 64 places, 63 transitions, 237 flow [2023-08-26 16:01:08,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:01:08,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:01:08,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 635 transitions. [2023-08-26 16:01:08,722 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48547400611620795 [2023-08-26 16:01:08,722 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 635 transitions. [2023-08-26 16:01:08,723 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 635 transitions. [2023-08-26 16:01:08,724 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:08,726 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 635 transitions. [2023-08-26 16:01:08,730 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 211.66666666666666) internal successors, (635), 3 states have internal predecessors, (635), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:08,736 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 436.0) internal successors, (1744), 4 states have internal predecessors, (1744), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:08,737 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 436.0) internal successors, (1744), 4 states have internal predecessors, (1744), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:08,738 INFO L175 Difference]: Start difference. First operand has 69 places, 91 transitions, 187 flow. Second operand 3 states and 635 transitions. [2023-08-26 16:01:08,739 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 64 places, 63 transitions, 237 flow [2023-08-26 16:01:08,741 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 64 places, 63 transitions, 237 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 16:01:08,743 INFO L231 Difference]: Finished difference. Result has 65 places, 37 transitions, 89 flow [2023-08-26 16:01:08,745 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=436, PETRI_DIFFERENCE_MINUEND_FLOW=129, PETRI_DIFFERENCE_MINUEND_PLACES=62, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=62, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=60, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=89, PETRI_PLACES=65, PETRI_TRANSITIONS=37} [2023-08-26 16:01:08,747 INFO L281 CegarLoopForPetriNet]: 69 programPoint places, -4 predicate places. [2023-08-26 16:01:08,748 INFO L495 AbstractCegarLoop]: Abstraction has has 65 places, 37 transitions, 89 flow [2023-08-26 16:01:08,748 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 185.66666666666666) internal successors, (557), 3 states have internal predecessors, (557), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:08,748 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:08,748 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2023-08-26 16:01:08,749 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 16:01:08,749 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:08,750 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:08,750 INFO L85 PathProgramCache]: Analyzing trace with hash -855119977, now seen corresponding path program 1 times [2023-08-26 16:01:08,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:08,750 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946349710] [2023-08-26 16:01:08,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:08,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:08,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:08,840 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 16:01:08,840 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:08,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946349710] [2023-08-26 16:01:08,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946349710] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:01:08,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678908176] [2023-08-26 16:01:08,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:08,842 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:08,842 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:08,849 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:01:08,878 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-26 16:01:08,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:08,940 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-26 16:01:08,943 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:01:08,983 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 16:01:08,983 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:01:08,997 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 16:01:08,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678908176] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:01:08,998 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:01:08,998 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-26 16:01:08,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502426428] [2023-08-26 16:01:08,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:01:09,000 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 16:01:09,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:09,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 16:01:09,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-26 16:01:09,003 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 184 out of 436 [2023-08-26 16:01:09,005 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 65 places, 37 transitions, 89 flow. Second operand has 7 states, 7 states have (on average 185.57142857142858) internal successors, (1299), 7 states have internal predecessors, (1299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:09,005 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:09,005 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 184 of 436 [2023-08-26 16:01:09,005 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:09,100 INFO L124 PetriNetUnfolderBase]: 112/279 cut-off events. [2023-08-26 16:01:09,100 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:01:09,101 INFO L83 FinitePrefix]: Finished finitePrefix Result has 543 conditions, 279 events. 112/279 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 28. Compared 1148 event pairs, 105 based on Foata normal form. 0/167 useless extension candidates. Maximal degree in co-relation 531. Up to 245 conditions per place. [2023-08-26 16:01:09,102 INFO L140 encePairwiseOnDemand]: 433/436 looper letters, 29 selfloop transitions, 5 changer transitions 0/40 dead transitions. [2023-08-26 16:01:09,102 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 40 transitions, 169 flow [2023-08-26 16:01:09,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 16:01:09,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 16:01:09,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1141 transitions. [2023-08-26 16:01:09,106 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43616207951070335 [2023-08-26 16:01:09,106 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1141 transitions. [2023-08-26 16:01:09,106 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1141 transitions. [2023-08-26 16:01:09,107 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:09,107 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1141 transitions. [2023-08-26 16:01:09,109 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 190.16666666666666) internal successors, (1141), 6 states have internal predecessors, (1141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:09,114 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 436.0) internal successors, (3052), 7 states have internal predecessors, (3052), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:09,115 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 436.0) internal successors, (3052), 7 states have internal predecessors, (3052), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:09,115 INFO L175 Difference]: Start difference. First operand has 65 places, 37 transitions, 89 flow. Second operand 6 states and 1141 transitions. [2023-08-26 16:01:09,115 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 40 transitions, 169 flow [2023-08-26 16:01:09,116 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 44 places, 40 transitions, 165 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-26 16:01:09,117 INFO L231 Difference]: Finished difference. Result has 47 places, 40 transitions, 121 flow [2023-08-26 16:01:09,117 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=436, PETRI_DIFFERENCE_MINUEND_FLOW=85, PETRI_DIFFERENCE_MINUEND_PLACES=39, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=37, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=121, PETRI_PLACES=47, PETRI_TRANSITIONS=40} [2023-08-26 16:01:09,118 INFO L281 CegarLoopForPetriNet]: 69 programPoint places, -22 predicate places. [2023-08-26 16:01:09,118 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 40 transitions, 121 flow [2023-08-26 16:01:09,119 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 185.57142857142858) internal successors, (1299), 7 states have internal predecessors, (1299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:09,119 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:09,119 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:09,135 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-08-26 16:01:09,329 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:09,329 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:09,330 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:09,330 INFO L85 PathProgramCache]: Analyzing trace with hash 1932111881, now seen corresponding path program 2 times [2023-08-26 16:01:09,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:09,330 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612644422] [2023-08-26 16:01:09,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:09,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:09,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:09,490 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 16:01:09,491 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:09,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612644422] [2023-08-26 16:01:09,491 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1612644422] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:01:09,492 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651437657] [2023-08-26 16:01:09,492 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 16:01:09,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:09,492 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:09,502 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:01:09,506 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-26 16:01:09,583 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 16:01:09,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 16:01:09,584 INFO L262 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-26 16:01:09,585 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:01:09,602 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 16:01:09,602 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:01:09,651 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 16:01:09,652 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651437657] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:01:09,652 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:01:09,652 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-26 16:01:09,652 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653729145] [2023-08-26 16:01:09,652 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:01:09,653 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-26 16:01:09,653 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:09,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-26 16:01:09,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-26 16:01:09,657 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 184 out of 436 [2023-08-26 16:01:09,660 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 47 places, 40 transitions, 121 flow. Second operand has 13 states, 13 states have (on average 185.30769230769232) internal successors, (2409), 13 states have internal predecessors, (2409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:09,660 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:09,660 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 184 of 436 [2023-08-26 16:01:09,660 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:09,768 INFO L124 PetriNetUnfolderBase]: 112/285 cut-off events. [2023-08-26 16:01:09,768 INFO L125 PetriNetUnfolderBase]: For 20/20 co-relation queries the response was YES. [2023-08-26 16:01:09,769 INFO L83 FinitePrefix]: Finished finitePrefix Result has 580 conditions, 285 events. 112/285 cut-off events. For 20/20 co-relation queries the response was YES. Maximal size of possible extension queue 28. Compared 1148 event pairs, 105 based on Foata normal form. 6/180 useless extension candidates. Maximal degree in co-relation 522. Up to 245 conditions per place. [2023-08-26 16:01:09,770 INFO L140 encePairwiseOnDemand]: 433/436 looper letters, 29 selfloop transitions, 11 changer transitions 0/46 dead transitions. [2023-08-26 16:01:09,770 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 46 transitions, 237 flow [2023-08-26 16:01:09,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-08-26 16:01:09,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-08-26 16:01:09,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 2254 transitions. [2023-08-26 16:01:09,776 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4308103975535168 [2023-08-26 16:01:09,776 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 2254 transitions. [2023-08-26 16:01:09,776 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 2254 transitions. [2023-08-26 16:01:09,777 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:09,777 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 2254 transitions. [2023-08-26 16:01:09,782 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 187.83333333333334) internal successors, (2254), 12 states have internal predecessors, (2254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:09,789 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 436.0) internal successors, (5668), 13 states have internal predecessors, (5668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:09,792 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 436.0) internal successors, (5668), 13 states have internal predecessors, (5668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:09,792 INFO L175 Difference]: Start difference. First operand has 47 places, 40 transitions, 121 flow. Second operand 12 states and 2254 transitions. [2023-08-26 16:01:09,792 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 46 transitions, 237 flow [2023-08-26 16:01:09,794 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 57 places, 46 transitions, 223 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-08-26 16:01:09,795 INFO L231 Difference]: Finished difference. Result has 63 places, 46 transitions, 191 flow [2023-08-26 16:01:09,795 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=436, PETRI_DIFFERENCE_MINUEND_FLOW=107, PETRI_DIFFERENCE_MINUEND_PLACES=46, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=191, PETRI_PLACES=63, PETRI_TRANSITIONS=46} [2023-08-26 16:01:09,796 INFO L281 CegarLoopForPetriNet]: 69 programPoint places, -6 predicate places. [2023-08-26 16:01:09,796 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 46 transitions, 191 flow [2023-08-26 16:01:09,797 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 185.30769230769232) internal successors, (2409), 13 states have internal predecessors, (2409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:09,797 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:09,797 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:09,808 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-26 16:01:10,008 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-08-26 16:01:10,009 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:10,009 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:10,009 INFO L85 PathProgramCache]: Analyzing trace with hash -1632049847, now seen corresponding path program 3 times [2023-08-26 16:01:10,010 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:10,010 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764139527] [2023-08-26 16:01:10,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:10,010 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:10,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:01:10,044 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 16:01:10,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:01:10,076 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 16:01:10,076 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 16:01:10,077 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 16:01:10,078 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 16:01:10,078 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-08-26 16:01:10,080 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-26 16:01:10,081 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 16:01:10,081 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 16:01:10,113 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 16:01:10,117 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 266 places, 309 transitions, 636 flow [2023-08-26 16:01:10,204 INFO L124 PetriNetUnfolderBase]: 80/516 cut-off events. [2023-08-26 16:01:10,204 INFO L125 PetriNetUnfolderBase]: For 6/8 co-relation queries the response was YES. [2023-08-26 16:01:10,209 INFO L83 FinitePrefix]: Finished finitePrefix Result has 530 conditions, 516 events. 80/516 cut-off events. For 6/8 co-relation queries the response was YES. Maximal size of possible extension queue 21. Compared 2399 event pairs, 0 based on Foata normal form. 0/363 useless extension candidates. Maximal degree in co-relation 317. Up to 12 conditions per place. [2023-08-26 16:01:10,209 INFO L82 GeneralOperation]: Start removeDead. Operand has 266 places, 309 transitions, 636 flow [2023-08-26 16:01:10,213 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 266 places, 309 transitions, 636 flow [2023-08-26 16:01:10,214 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:01:10,214 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 266 places, 309 transitions, 636 flow [2023-08-26 16:01:10,214 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 266 places, 309 transitions, 636 flow [2023-08-26 16:01:10,214 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 266 places, 309 transitions, 636 flow [2023-08-26 16:01:10,265 INFO L124 PetriNetUnfolderBase]: 80/516 cut-off events. [2023-08-26 16:01:10,265 INFO L125 PetriNetUnfolderBase]: For 6/8 co-relation queries the response was YES. [2023-08-26 16:01:10,270 INFO L83 FinitePrefix]: Finished finitePrefix Result has 530 conditions, 516 events. 80/516 cut-off events. For 6/8 co-relation queries the response was YES. Maximal size of possible extension queue 21. Compared 2399 event pairs, 0 based on Foata normal form. 0/363 useless extension candidates. Maximal degree in co-relation 317. Up to 12 conditions per place. [2023-08-26 16:01:10,292 INFO L119 LiptonReduction]: Number of co-enabled transitions 46740 [2023-08-26 16:01:14,555 INFO L134 LiptonReduction]: Checked pairs total: 94531 [2023-08-26 16:01:14,555 INFO L136 LiptonReduction]: Total number of compositions: 294 [2023-08-26 16:01:14,557 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 16:01:14,558 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5c25dfe, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:01:14,558 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 16:01:14,568 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:01:14,568 INFO L124 PetriNetUnfolderBase]: 39/158 cut-off events. [2023-08-26 16:01:14,568 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 16:01:14,568 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:14,569 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:14,569 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:14,569 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:14,569 INFO L85 PathProgramCache]: Analyzing trace with hash -244941564, now seen corresponding path program 1 times [2023-08-26 16:01:14,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:14,570 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872174344] [2023-08-26 16:01:14,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:14,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:14,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:14,599 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-26 16:01:14,599 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:14,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872174344] [2023-08-26 16:01:14,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872174344] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:01:14,599 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:01:14,600 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:01:14,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042100124] [2023-08-26 16:01:14,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:01:14,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:01:14,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:14,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:01:14,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:01:14,601 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 252 out of 603 [2023-08-26 16:01:14,602 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 102 places, 136 transitions, 290 flow. Second operand has 3 states, 3 states have (on average 254.0) internal successors, (762), 3 states have internal predecessors, (762), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:14,602 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:14,602 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 252 of 603 [2023-08-26 16:01:14,602 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:17,977 INFO L124 PetriNetUnfolderBase]: 27259/43852 cut-off events. [2023-08-26 16:01:17,978 INFO L125 PetriNetUnfolderBase]: For 147/147 co-relation queries the response was YES. [2023-08-26 16:01:18,040 INFO L83 FinitePrefix]: Finished finitePrefix Result has 84013 conditions, 43852 events. 27259/43852 cut-off events. For 147/147 co-relation queries the response was YES. Maximal size of possible extension queue 1805. Compared 360238 event pairs, 25814 based on Foata normal form. 3534/31366 useless extension candidates. Maximal degree in co-relation 34169. Up to 40029 conditions per place. [2023-08-26 16:01:18,097 INFO L140 encePairwiseOnDemand]: 559/603 looper letters, 50 selfloop transitions, 2 changer transitions 31/96 dead transitions. [2023-08-26 16:01:18,097 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 96 places, 96 transitions, 366 flow [2023-08-26 16:01:18,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:01:18,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:01:18,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 876 transitions. [2023-08-26 16:01:18,100 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4842454394693201 [2023-08-26 16:01:18,101 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 876 transitions. [2023-08-26 16:01:18,101 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 876 transitions. [2023-08-26 16:01:18,101 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:18,101 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 876 transitions. [2023-08-26 16:01:18,103 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 292.0) internal successors, (876), 3 states have internal predecessors, (876), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:18,105 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 603.0) internal successors, (2412), 4 states have internal predecessors, (2412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:18,106 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 603.0) internal successors, (2412), 4 states have internal predecessors, (2412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:18,106 INFO L175 Difference]: Start difference. First operand has 102 places, 136 transitions, 290 flow. Second operand 3 states and 876 transitions. [2023-08-26 16:01:18,106 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 96 places, 96 transitions, 366 flow [2023-08-26 16:01:18,108 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 96 places, 96 transitions, 366 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 16:01:18,110 INFO L231 Difference]: Finished difference. Result has 97 places, 65 transitions, 152 flow [2023-08-26 16:01:18,110 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=603, PETRI_DIFFERENCE_MINUEND_FLOW=208, PETRI_DIFFERENCE_MINUEND_PLACES=94, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=95, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=93, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=152, PETRI_PLACES=97, PETRI_TRANSITIONS=65} [2023-08-26 16:01:18,111 INFO L281 CegarLoopForPetriNet]: 102 programPoint places, -5 predicate places. [2023-08-26 16:01:18,111 INFO L495 AbstractCegarLoop]: Abstraction has has 97 places, 65 transitions, 152 flow [2023-08-26 16:01:18,111 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 254.0) internal successors, (762), 3 states have internal predecessors, (762), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:18,111 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:18,112 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 16:01:18,112 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 16:01:18,112 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:18,112 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:18,112 INFO L85 PathProgramCache]: Analyzing trace with hash 1114177120, now seen corresponding path program 1 times [2023-08-26 16:01:18,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:18,112 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618584094] [2023-08-26 16:01:18,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:18,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:18,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:18,149 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-26 16:01:18,149 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:18,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618584094] [2023-08-26 16:01:18,150 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618584094] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:01:18,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596644967] [2023-08-26 16:01:18,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:18,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:18,150 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:18,151 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:01:18,160 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-08-26 16:01:18,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:18,243 INFO L262 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-26 16:01:18,244 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:01:18,251 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-26 16:01:18,251 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:01:18,266 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-26 16:01:18,269 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596644967] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:01:18,269 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:01:18,270 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-26 16:01:18,270 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698612350] [2023-08-26 16:01:18,270 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:01:18,271 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 16:01:18,271 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:18,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 16:01:18,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-26 16:01:18,273 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 252 out of 603 [2023-08-26 16:01:18,275 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 97 places, 65 transitions, 152 flow. Second operand has 7 states, 7 states have (on average 253.71428571428572) internal successors, (1776), 7 states have internal predecessors, (1776), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:18,275 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:18,275 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 252 of 603 [2023-08-26 16:01:18,275 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:18,925 INFO L124 PetriNetUnfolderBase]: 5186/8629 cut-off events. [2023-08-26 16:01:18,925 INFO L125 PetriNetUnfolderBase]: For 70/70 co-relation queries the response was YES. [2023-08-26 16:01:18,938 INFO L83 FinitePrefix]: Finished finitePrefix Result has 16580 conditions, 8629 events. 5186/8629 cut-off events. For 70/70 co-relation queries the response was YES. Maximal size of possible extension queue 428. Compared 59667 event pairs, 4945 based on Foata normal form. 0/5200 useless extension candidates. Maximal degree in co-relation 16567. Up to 7851 conditions per place. [2023-08-26 16:01:18,957 INFO L140 encePairwiseOnDemand]: 600/603 looper letters, 50 selfloop transitions, 5 changer transitions 0/68 dead transitions. [2023-08-26 16:01:18,957 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 68 transitions, 274 flow [2023-08-26 16:01:18,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 16:01:18,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 16:01:18,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1570 transitions. [2023-08-26 16:01:18,963 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43394140409065785 [2023-08-26 16:01:18,964 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1570 transitions. [2023-08-26 16:01:18,964 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1570 transitions. [2023-08-26 16:01:18,964 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:18,965 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1570 transitions. [2023-08-26 16:01:18,967 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 261.6666666666667) internal successors, (1570), 6 states have internal predecessors, (1570), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:18,973 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 603.0) internal successors, (4221), 7 states have internal predecessors, (4221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:18,973 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 603.0) internal successors, (4221), 7 states have internal predecessors, (4221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:18,974 INFO L175 Difference]: Start difference. First operand has 97 places, 65 transitions, 152 flow. Second operand 6 states and 1570 transitions. [2023-08-26 16:01:18,974 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 68 transitions, 274 flow [2023-08-26 16:01:18,975 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 68 transitions, 268 flow, removed 2 selfloop flow, removed 1 redundant places. [2023-08-26 16:01:18,976 INFO L231 Difference]: Finished difference. Result has 76 places, 68 transitions, 182 flow [2023-08-26 16:01:18,976 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=603, PETRI_DIFFERENCE_MINUEND_FLOW=146, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=65, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=62, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=182, PETRI_PLACES=76, PETRI_TRANSITIONS=68} [2023-08-26 16:01:18,976 INFO L281 CegarLoopForPetriNet]: 102 programPoint places, -26 predicate places. [2023-08-26 16:01:18,977 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 68 transitions, 182 flow [2023-08-26 16:01:18,977 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 253.71428571428572) internal successors, (1776), 7 states have internal predecessors, (1776), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:18,977 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:18,978 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:18,986 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-08-26 16:01:19,183 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:19,184 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:19,184 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:19,184 INFO L85 PathProgramCache]: Analyzing trace with hash 1588196356, now seen corresponding path program 2 times [2023-08-26 16:01:19,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:19,184 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758312583] [2023-08-26 16:01:19,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:19,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:19,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:19,274 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-26 16:01:19,274 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:19,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758312583] [2023-08-26 16:01:19,276 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758312583] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:01:19,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1441829149] [2023-08-26 16:01:19,276 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 16:01:19,276 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:19,276 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:19,277 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:01:19,278 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-08-26 16:01:19,396 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 16:01:19,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 16:01:19,397 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-26 16:01:19,398 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:01:19,419 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-26 16:01:19,419 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:01:19,470 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-26 16:01:19,470 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1441829149] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:01:19,470 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:01:19,470 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-26 16:01:19,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171225969] [2023-08-26 16:01:19,471 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:01:19,471 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-26 16:01:19,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:19,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-26 16:01:19,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-26 16:01:19,474 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 252 out of 603 [2023-08-26 16:01:19,478 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 68 transitions, 182 flow. Second operand has 13 states, 13 states have (on average 253.3846153846154) internal successors, (3294), 13 states have internal predecessors, (3294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:19,478 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:19,478 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 252 of 603 [2023-08-26 16:01:19,478 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:20,147 INFO L124 PetriNetUnfolderBase]: 5186/8635 cut-off events. [2023-08-26 16:01:20,147 INFO L125 PetriNetUnfolderBase]: For 81/81 co-relation queries the response was YES. [2023-08-26 16:01:20,158 INFO L83 FinitePrefix]: Finished finitePrefix Result has 16608 conditions, 8635 events. 5186/8635 cut-off events. For 81/81 co-relation queries the response was YES. Maximal size of possible extension queue 428. Compared 59658 event pairs, 4945 based on Foata normal form. 6/5213 useless extension candidates. Maximal degree in co-relation 16549. Up to 7851 conditions per place. [2023-08-26 16:01:20,177 INFO L140 encePairwiseOnDemand]: 600/603 looper letters, 50 selfloop transitions, 11 changer transitions 0/74 dead transitions. [2023-08-26 16:01:20,177 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 87 places, 74 transitions, 340 flow [2023-08-26 16:01:20,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-08-26 16:01:20,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-08-26 16:01:20,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 3091 transitions. [2023-08-26 16:01:20,186 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4271697070204533 [2023-08-26 16:01:20,186 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 3091 transitions. [2023-08-26 16:01:20,186 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 3091 transitions. [2023-08-26 16:01:20,188 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:20,188 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 3091 transitions. [2023-08-26 16:01:20,194 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 257.5833333333333) internal successors, (3091), 12 states have internal predecessors, (3091), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:20,205 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 603.0) internal successors, (7839), 13 states have internal predecessors, (7839), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:20,207 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 603.0) internal successors, (7839), 13 states have internal predecessors, (7839), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:20,207 INFO L175 Difference]: Start difference. First operand has 76 places, 68 transitions, 182 flow. Second operand 12 states and 3091 transitions. [2023-08-26 16:01:20,207 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 87 places, 74 transitions, 340 flow [2023-08-26 16:01:20,208 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 86 places, 74 transitions, 326 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-08-26 16:01:20,209 INFO L231 Difference]: Finished difference. Result has 92 places, 74 transitions, 252 flow [2023-08-26 16:01:20,209 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=603, PETRI_DIFFERENCE_MINUEND_FLOW=168, PETRI_DIFFERENCE_MINUEND_PLACES=75, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=68, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=62, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=252, PETRI_PLACES=92, PETRI_TRANSITIONS=74} [2023-08-26 16:01:20,210 INFO L281 CegarLoopForPetriNet]: 102 programPoint places, -10 predicate places. [2023-08-26 16:01:20,210 INFO L495 AbstractCegarLoop]: Abstraction has has 92 places, 74 transitions, 252 flow [2023-08-26 16:01:20,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 253.3846153846154) internal successors, (3294), 13 states have internal predecessors, (3294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:20,211 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:20,211 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 3, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:20,224 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-08-26 16:01:20,417 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:20,417 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:20,418 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:20,418 INFO L85 PathProgramCache]: Analyzing trace with hash 1887868548, now seen corresponding path program 3 times [2023-08-26 16:01:20,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:20,418 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436406556] [2023-08-26 16:01:20,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:20,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:20,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:01:20,448 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 16:01:20,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:01:20,487 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 16:01:20,488 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 16:01:20,488 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 16:01:20,488 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 16:01:20,488 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-08-26 16:01:20,489 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-26 16:01:20,489 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 16:01:20,489 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 16:01:20,543 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 16:01:20,547 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 337 places, 393 transitions, 816 flow [2023-08-26 16:01:20,669 INFO L124 PetriNetUnfolderBase]: 117/754 cut-off events. [2023-08-26 16:01:20,670 INFO L125 PetriNetUnfolderBase]: For 19/22 co-relation queries the response was YES. [2023-08-26 16:01:20,684 INFO L83 FinitePrefix]: Finished finitePrefix Result has 782 conditions, 754 events. 117/754 cut-off events. For 19/22 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 3809 event pairs, 1 based on Foata normal form. 0/532 useless extension candidates. Maximal degree in co-relation 524. Up to 16 conditions per place. [2023-08-26 16:01:20,684 INFO L82 GeneralOperation]: Start removeDead. Operand has 337 places, 393 transitions, 816 flow [2023-08-26 16:01:20,691 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 337 places, 393 transitions, 816 flow [2023-08-26 16:01:20,692 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:01:20,692 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 337 places, 393 transitions, 816 flow [2023-08-26 16:01:20,692 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 337 places, 393 transitions, 816 flow [2023-08-26 16:01:20,692 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 337 places, 393 transitions, 816 flow [2023-08-26 16:01:20,805 INFO L124 PetriNetUnfolderBase]: 117/754 cut-off events. [2023-08-26 16:01:20,805 INFO L125 PetriNetUnfolderBase]: For 19/22 co-relation queries the response was YES. [2023-08-26 16:01:20,819 INFO L83 FinitePrefix]: Finished finitePrefix Result has 782 conditions, 754 events. 117/754 cut-off events. For 19/22 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 3809 event pairs, 1 based on Foata normal form. 0/532 useless extension candidates. Maximal degree in co-relation 524. Up to 16 conditions per place. [2023-08-26 16:01:20,859 INFO L119 LiptonReduction]: Number of co-enabled transitions 91020 [2023-08-26 16:01:25,712 INFO L134 LiptonReduction]: Checked pairs total: 188612 [2023-08-26 16:01:25,712 INFO L136 LiptonReduction]: Total number of compositions: 362 [2023-08-26 16:01:25,713 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 16:01:25,714 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5c25dfe, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:01:25,714 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 16:01:25,727 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:01:25,727 INFO L124 PetriNetUnfolderBase]: 59/245 cut-off events. [2023-08-26 16:01:25,727 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 16:01:25,727 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:25,727 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-08-26 16:01:25,728 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:25,728 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:25,728 INFO L85 PathProgramCache]: Analyzing trace with hash 1066022097, now seen corresponding path program 1 times [2023-08-26 16:01:25,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:25,728 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060438849] [2023-08-26 16:01:25,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:25,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:25,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:25,753 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-08-26 16:01:25,754 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:25,754 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2060438849] [2023-08-26 16:01:25,754 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2060438849] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:01:25,754 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:01:25,754 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:01:25,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245187233] [2023-08-26 16:01:25,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:01:25,754 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:01:25,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:25,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:01:25,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:01:25,756 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 320 out of 755 [2023-08-26 16:01:25,757 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 132 places, 174 transitions, 378 flow. Second operand has 3 states, 3 states have (on average 322.3333333333333) internal successors, (967), 3 states have internal predecessors, (967), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:01:25,757 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:25,757 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 320 of 755 [2023-08-26 16:01:25,757 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:02:36,533 INFO L124 PetriNetUnfolderBase]: 750749/1083918 cut-off events. [2023-08-26 16:02:36,533 INFO L125 PetriNetUnfolderBase]: For 5759/5759 co-relation queries the response was YES. [2023-08-26 16:02:38,453 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2070681 conditions, 1083918 events. 750749/1083918 cut-off events. For 5759/5759 co-relation queries the response was YES. Maximal size of possible extension queue 35987. Compared 10483238 event pairs, 720613 based on Foata normal form. 93120/834167 useless extension candidates. Maximal degree in co-relation 214968. Up to 983120 conditions per place. [2023-08-26 16:02:39,561 INFO L140 encePairwiseOnDemand]: 701/755 looper letters, 68 selfloop transitions, 2 changer transitions 32/124 dead transitions. [2023-08-26 16:02:39,562 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 124 places, 124 transitions, 472 flow [2023-08-26 16:02:39,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:02:39,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:02:39,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1109 transitions. [2023-08-26 16:02:39,565 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4896247240618102 [2023-08-26 16:02:39,565 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1109 transitions. [2023-08-26 16:02:39,565 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1109 transitions. [2023-08-26 16:02:39,566 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:02:39,566 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1109 transitions. [2023-08-26 16:02:39,568 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 369.6666666666667) internal successors, (1109), 3 states have internal predecessors, (1109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:02:39,571 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 755.0) internal successors, (3020), 4 states have internal predecessors, (3020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:02:39,572 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 755.0) internal successors, (3020), 4 states have internal predecessors, (3020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:02:39,572 INFO L175 Difference]: Start difference. First operand has 132 places, 174 transitions, 378 flow. Second operand 3 states and 1109 transitions. [2023-08-26 16:02:39,572 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 124 places, 124 transitions, 472 flow [2023-08-26 16:02:39,580 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 124 places, 124 transitions, 472 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 16:02:39,581 INFO L231 Difference]: Finished difference. Result has 125 places, 92 transitions, 215 flow [2023-08-26 16:02:39,582 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=755, PETRI_DIFFERENCE_MINUEND_FLOW=276, PETRI_DIFFERENCE_MINUEND_PLACES=122, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=123, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=121, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=215, PETRI_PLACES=125, PETRI_TRANSITIONS=92} [2023-08-26 16:02:39,582 INFO L281 CegarLoopForPetriNet]: 132 programPoint places, -7 predicate places. [2023-08-26 16:02:39,582 INFO L495 AbstractCegarLoop]: Abstraction has has 125 places, 92 transitions, 215 flow [2023-08-26 16:02:39,583 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 322.3333333333333) internal successors, (967), 3 states have internal predecessors, (967), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:02:39,583 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:02:39,583 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:02:39,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 16:02:39,584 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:02:39,584 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:02:39,584 INFO L85 PathProgramCache]: Analyzing trace with hash 1794920196, now seen corresponding path program 1 times [2023-08-26 16:02:39,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:02:39,584 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678640964] [2023-08-26 16:02:39,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:02:39,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:02:39,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:02:39,617 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-08-26 16:02:39,617 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:02:39,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678640964] [2023-08-26 16:02:39,618 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678640964] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:02:39,618 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066247229] [2023-08-26 16:02:39,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:02:39,618 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:02:39,618 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:02:39,624 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:02:39,625 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-08-26 16:02:39,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:02:39,722 INFO L262 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-26 16:02:39,723 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:02:39,735 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-08-26 16:02:39,735 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:02:39,755 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-08-26 16:02:39,755 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066247229] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:02:39,755 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:02:39,756 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-26 16:02:39,756 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848662435] [2023-08-26 16:02:39,756 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:02:39,756 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 16:02:39,756 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:02:39,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 16:02:39,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-26 16:02:39,758 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 320 out of 755 [2023-08-26 16:02:39,760 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 125 places, 92 transitions, 215 flow. Second operand has 7 states, 7 states have (on average 321.85714285714283) internal successors, (2253), 7 states have internal predecessors, (2253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:02:39,760 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:02:39,760 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 320 of 755 [2023-08-26 16:02:39,760 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:02:52,676 INFO L124 PetriNetUnfolderBase]: 146240/213986 cut-off events. [2023-08-26 16:02:52,676 INFO L125 PetriNetUnfolderBase]: For 3082/3082 co-relation queries the response was YES. [2023-08-26 16:02:53,081 INFO L83 FinitePrefix]: Finished finitePrefix Result has 409606 conditions, 213986 events. 146240/213986 cut-off events. For 3082/3082 co-relation queries the response was YES. Maximal size of possible extension queue 8333. Compared 1831355 event pairs, 140275 based on Foata normal form. 0/141483 useless extension candidates. Maximal degree in co-relation 409592. Up to 193329 conditions per place. [2023-08-26 16:02:53,427 INFO L140 encePairwiseOnDemand]: 752/755 looper letters, 68 selfloop transitions, 5 changer transitions 0/95 dead transitions. [2023-08-26 16:02:53,428 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 102 places, 95 transitions, 373 flow [2023-08-26 16:02:53,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 16:02:53,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 16:02:53,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1996 transitions. [2023-08-26 16:02:53,433 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4406181015452539 [2023-08-26 16:02:53,433 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1996 transitions. [2023-08-26 16:02:53,433 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1996 transitions. [2023-08-26 16:02:53,434 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:02:53,434 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1996 transitions. [2023-08-26 16:02:53,438 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 332.6666666666667) internal successors, (1996), 6 states have internal predecessors, (1996), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:02:53,443 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 755.0) internal successors, (5285), 7 states have internal predecessors, (5285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:02:53,444 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 755.0) internal successors, (5285), 7 states have internal predecessors, (5285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:02:53,444 INFO L175 Difference]: Start difference. First operand has 125 places, 92 transitions, 215 flow. Second operand 6 states and 1996 transitions. [2023-08-26 16:02:53,444 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 102 places, 95 transitions, 373 flow [2023-08-26 16:02:53,447 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 101 places, 95 transitions, 363 flow, removed 4 selfloop flow, removed 1 redundant places. [2023-08-26 16:02:53,448 INFO L231 Difference]: Finished difference. Result has 104 places, 95 transitions, 241 flow [2023-08-26 16:02:53,449 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=755, PETRI_DIFFERENCE_MINUEND_FLOW=205, PETRI_DIFFERENCE_MINUEND_PLACES=96, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=92, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=89, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=241, PETRI_PLACES=104, PETRI_TRANSITIONS=95} [2023-08-26 16:02:53,449 INFO L281 CegarLoopForPetriNet]: 132 programPoint places, -28 predicate places. [2023-08-26 16:02:53,449 INFO L495 AbstractCegarLoop]: Abstraction has has 104 places, 95 transitions, 241 flow [2023-08-26 16:02:53,450 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 321.85714285714283) internal successors, (2253), 7 states have internal predecessors, (2253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:02:53,450 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:02:53,450 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-08-26 16:02:53,456 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-08-26 16:02:53,655 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-08-26 16:02:53,656 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:02:53,656 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:02:53,656 INFO L85 PathProgramCache]: Analyzing trace with hash -1739019887, now seen corresponding path program 2 times [2023-08-26 16:02:53,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:02:53,657 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942692534] [2023-08-26 16:02:53,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:02:53,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:02:53,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:02:53,735 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-08-26 16:02:53,735 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:02:53,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942692534] [2023-08-26 16:02:53,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942692534] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:02:53,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330610333] [2023-08-26 16:02:53,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 16:02:53,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:02:53,736 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:02:53,736 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:02:53,739 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-08-26 16:02:53,838 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 16:02:53,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 16:02:53,840 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-26 16:02:53,841 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:02:53,857 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-08-26 16:02:53,858 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:02:53,900 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-08-26 16:02:53,901 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330610333] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:02:53,901 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:02:53,901 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-26 16:02:53,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259465956] [2023-08-26 16:02:53,901 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:02:53,901 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-26 16:02:53,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:02:53,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-26 16:02:53,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-26 16:02:53,904 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 320 out of 755 [2023-08-26 16:02:53,906 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 104 places, 95 transitions, 241 flow. Second operand has 13 states, 13 states have (on average 321.46153846153845) internal successors, (4179), 13 states have internal predecessors, (4179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:02:53,907 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:02:53,907 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 320 of 755 [2023-08-26 16:02:53,907 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:03:07,315 INFO L124 PetriNetUnfolderBase]: 146240/213992 cut-off events. [2023-08-26 16:03:07,315 INFO L125 PetriNetUnfolderBase]: For 1323/1323 co-relation queries the response was YES. [2023-08-26 16:03:08,114 INFO L83 FinitePrefix]: Finished finitePrefix Result has 408871 conditions, 213992 events. 146240/213992 cut-off events. For 1323/1323 co-relation queries the response was YES. Maximal size of possible extension queue 8347. Compared 1831938 event pairs, 140275 based on Foata normal form. 6/141496 useless extension candidates. Maximal degree in co-relation 408811. Up to 193329 conditions per place. [2023-08-26 16:03:08,445 INFO L140 encePairwiseOnDemand]: 752/755 looper letters, 68 selfloop transitions, 11 changer transitions 0/101 dead transitions. [2023-08-26 16:03:08,445 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 115 places, 101 transitions, 435 flow [2023-08-26 16:03:08,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-08-26 16:03:08,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-08-26 16:03:08,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 3925 transitions. [2023-08-26 16:03:08,453 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43322295805739514 [2023-08-26 16:03:08,453 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 3925 transitions. [2023-08-26 16:03:08,453 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 3925 transitions. [2023-08-26 16:03:08,455 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:03:08,455 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 3925 transitions. [2023-08-26 16:03:08,461 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 327.0833333333333) internal successors, (3925), 12 states have internal predecessors, (3925), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:03:08,471 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 755.0) internal successors, (9815), 13 states have internal predecessors, (9815), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:03:08,472 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 755.0) internal successors, (9815), 13 states have internal predecessors, (9815), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:03:08,472 INFO L175 Difference]: Start difference. First operand has 104 places, 95 transitions, 241 flow. Second operand 12 states and 3925 transitions. [2023-08-26 16:03:08,472 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 115 places, 101 transitions, 435 flow [2023-08-26 16:03:08,475 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 114 places, 101 transitions, 421 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-08-26 16:03:08,476 INFO L231 Difference]: Finished difference. Result has 120 places, 101 transitions, 311 flow [2023-08-26 16:03:08,476 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=755, PETRI_DIFFERENCE_MINUEND_FLOW=227, PETRI_DIFFERENCE_MINUEND_PLACES=103, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=95, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=89, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=311, PETRI_PLACES=120, PETRI_TRANSITIONS=101} [2023-08-26 16:03:08,477 INFO L281 CegarLoopForPetriNet]: 132 programPoint places, -12 predicate places. [2023-08-26 16:03:08,477 INFO L495 AbstractCegarLoop]: Abstraction has has 120 places, 101 transitions, 311 flow [2023-08-26 16:03:08,478 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 321.46153846153845) internal successors, (4179), 13 states have internal predecessors, (4179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:03:08,478 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:03:08,478 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-08-26 16:03:08,485 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-08-26 16:03:08,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:03:08,683 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:03:08,684 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:03:08,684 INFO L85 PathProgramCache]: Analyzing trace with hash 312845489, now seen corresponding path program 3 times [2023-08-26 16:03:08,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:03:08,684 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908828230] [2023-08-26 16:03:08,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:03:08,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:03:08,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:03:08,707 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 16:03:08,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:03:08,728 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 16:03:08,729 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 16:03:08,729 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 16:03:08,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 16:03:08,729 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-08-26 16:03:08,730 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-26 16:03:08,730 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 16:03:08,730 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 16:03:08,772 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 16:03:08,776 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 408 places, 477 transitions, 998 flow [2023-08-26 16:03:08,932 INFO L124 PetriNetUnfolderBase]: 166/1068 cut-off events. [2023-08-26 16:03:08,933 INFO L125 PetriNetUnfolderBase]: For 48/52 co-relation queries the response was YES. [2023-08-26 16:03:08,953 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1123 conditions, 1068 events. 166/1068 cut-off events. For 48/52 co-relation queries the response was YES. Maximal size of possible extension queue 24. Compared 5810 event pairs, 6 based on Foata normal form. 0/761 useless extension candidates. Maximal degree in co-relation 774. Up to 32 conditions per place. [2023-08-26 16:03:08,954 INFO L82 GeneralOperation]: Start removeDead. Operand has 408 places, 477 transitions, 998 flow [2023-08-26 16:03:08,961 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 408 places, 477 transitions, 998 flow [2023-08-26 16:03:08,961 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:03:08,961 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 408 places, 477 transitions, 998 flow [2023-08-26 16:03:08,961 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 408 places, 477 transitions, 998 flow [2023-08-26 16:03:08,962 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 408 places, 477 transitions, 998 flow [2023-08-26 16:03:09,088 INFO L124 PetriNetUnfolderBase]: 166/1068 cut-off events. [2023-08-26 16:03:09,088 INFO L125 PetriNetUnfolderBase]: For 48/52 co-relation queries the response was YES. [2023-08-26 16:03:09,109 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1123 conditions, 1068 events. 166/1068 cut-off events. For 48/52 co-relation queries the response was YES. Maximal size of possible extension queue 24. Compared 5810 event pairs, 6 based on Foata normal form. 0/761 useless extension candidates. Maximal degree in co-relation 774. Up to 32 conditions per place. [2023-08-26 16:03:09,171 INFO L119 LiptonReduction]: Number of co-enabled transitions 149240 [2023-08-26 16:03:15,204 INFO L134 LiptonReduction]: Checked pairs total: 322104 [2023-08-26 16:03:15,204 INFO L136 LiptonReduction]: Total number of compositions: 443 [2023-08-26 16:03:15,206 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 16:03:15,206 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5c25dfe, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:03:15,206 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 16:03:15,231 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:03:15,231 INFO L124 PetriNetUnfolderBase]: 86/338 cut-off events. [2023-08-26 16:03:15,232 INFO L125 PetriNetUnfolderBase]: For 23/23 co-relation queries the response was YES. [2023-08-26 16:03:15,232 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:03:15,232 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:03:15,232 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:03:15,232 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:03:15,232 INFO L85 PathProgramCache]: Analyzing trace with hash -1204651345, now seen corresponding path program 1 times [2023-08-26 16:03:15,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:03:15,232 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725495413] [2023-08-26 16:03:15,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:03:15,233 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:03:15,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:03:15,261 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-08-26 16:03:15,261 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:03:15,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725495413] [2023-08-26 16:03:15,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1725495413] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:03:15,261 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:03:15,261 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:03:15,261 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832996153] [2023-08-26 16:03:15,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:03:15,262 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:03:15,262 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:03:15,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:03:15,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:03:15,263 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 388 out of 920 [2023-08-26 16:03:15,264 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 162 places, 216 transitions, 476 flow. Second operand has 3 states, 3 states have (on average 390.6666666666667) internal successors, (1172), 3 states have internal predecessors, (1172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 16:03:15,264 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:03:15,264 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 388 of 920 [2023-08-26 16:03:15,264 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand