/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_76-tricky_address3_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 16:01:13,672 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 16:01:13,747 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 16:01:13,751 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 16:01:13,752 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 16:01:13,787 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 16:01:13,788 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 16:01:13,788 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 16:01:13,789 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 16:01:13,794 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 16:01:13,794 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 16:01:13,794 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 16:01:13,794 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 16:01:13,795 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 16:01:13,795 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 16:01:13,795 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 16:01:13,795 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 16:01:13,795 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 16:01:13,796 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 16:01:13,796 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 16:01:13,796 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 16:01:13,797 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 16:01:13,797 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 16:01:13,798 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 16:01:13,798 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 16:01:13,798 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 16:01:13,798 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 16:01:13,799 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 16:01:13,799 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 16:01:13,799 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 16:01:13,800 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 16:01:13,801 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 16:01:13,801 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 16:01:13,801 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 16:01:13,801 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 16:01:13,801 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> INSUFFICIENT_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 16:01:14,101 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 16:01:14,126 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 16:01:14,129 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 16:01:14,130 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 16:01:14,131 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 16:01:14,132 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_76-tricky_address3_racefree.i [2023-08-26 16:01:15,273 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 16:01:15,584 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 16:01:15,584 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_76-tricky_address3_racefree.i [2023-08-26 16:01:15,600 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0fc76835d/bb69eadff84d4ffaa22bd8ed238daae2/FLAG2564676f9 [2023-08-26 16:01:15,613 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0fc76835d/bb69eadff84d4ffaa22bd8ed238daae2 [2023-08-26 16:01:15,615 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 16:01:15,616 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 16:01:15,617 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 16:01:15,617 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 16:01:15,620 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 16:01:15,620 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 04:01:15" (1/1) ... [2023-08-26 16:01:15,621 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b1c650f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:15, skipping insertion in model container [2023-08-26 16:01:15,621 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 04:01:15" (1/1) ... [2023-08-26 16:01:15,653 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 16:01:16,080 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 16:01:16,102 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 16:01:16,121 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 16:01:16,123 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 16:01:16,129 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: unsigned short [736] [2023-08-26 16:01:16,145 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 16:01:16,199 INFO L206 MainTranslator]: Completed translation [2023-08-26 16:01:16,199 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16 WrapperNode [2023-08-26 16:01:16,199 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 16:01:16,200 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 16:01:16,200 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 16:01:16,200 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 16:01:16,206 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16" (1/1) ... [2023-08-26 16:01:16,238 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16" (1/1) ... [2023-08-26 16:01:16,260 INFO L138 Inliner]: procedures = 270, calls = 42, calls flagged for inlining = 7, calls inlined = 8, statements flattened = 202 [2023-08-26 16:01:16,260 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 16:01:16,261 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 16:01:16,261 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 16:01:16,261 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 16:01:16,269 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16" (1/1) ... [2023-08-26 16:01:16,269 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16" (1/1) ... [2023-08-26 16:01:16,273 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16" (1/1) ... [2023-08-26 16:01:16,273 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16" (1/1) ... [2023-08-26 16:01:16,281 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16" (1/1) ... [2023-08-26 16:01:16,286 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16" (1/1) ... [2023-08-26 16:01:16,288 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16" (1/1) ... [2023-08-26 16:01:16,289 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16" (1/1) ... [2023-08-26 16:01:16,292 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 16:01:16,293 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 16:01:16,293 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 16:01:16,293 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 16:01:16,294 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16" (1/1) ... [2023-08-26 16:01:16,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 16:01:16,311 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:16,322 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 16:01:16,335 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 16:01:16,360 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 16:01:16,363 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 16:01:16,363 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 16:01:16,363 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 16:01:16,364 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 16:01:16,364 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 16:01:16,364 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 16:01:16,364 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 16:01:16,364 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 16:01:16,364 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 16:01:16,365 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 16:01:16,366 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 16:01:16,491 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 16:01:16,493 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 16:01:16,936 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 16:01:16,946 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 16:01:16,947 INFO L302 CfgBuilder]: Removed 23 assume(true) statements. [2023-08-26 16:01:16,949 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 04:01:16 BoogieIcfgContainer [2023-08-26 16:01:16,949 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 16:01:16,952 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 16:01:16,952 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 16:01:16,954 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 16:01:16,955 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 04:01:15" (1/3) ... [2023-08-26 16:01:16,956 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7910dc47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 04:01:16, skipping insertion in model container [2023-08-26 16:01:16,956 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:16" (2/3) ... [2023-08-26 16:01:16,957 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7910dc47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 04:01:16, skipping insertion in model container [2023-08-26 16:01:16,957 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 04:01:16" (3/3) ... [2023-08-26 16:01:16,958 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_76-tricky_address3_racefree.i [2023-08-26 16:01:16,981 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 16:01:16,981 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 26 error locations. [2023-08-26 16:01:16,981 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 16:01:17,064 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 16:01:17,101 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 198 places, 228 transitions, 464 flow [2023-08-26 16:01:17,177 INFO L124 PetriNetUnfolderBase]: 48/318 cut-off events. [2023-08-26 16:01:17,178 INFO L125 PetriNetUnfolderBase]: For 1/2 co-relation queries the response was YES. [2023-08-26 16:01:17,187 INFO L83 FinitePrefix]: Finished finitePrefix Result has 324 conditions, 318 events. 48/318 cut-off events. For 1/2 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 1193 event pairs, 0 based on Foata normal form. 0/226 useless extension candidates. Maximal degree in co-relation 180. Up to 8 conditions per place. [2023-08-26 16:01:17,187 INFO L82 GeneralOperation]: Start removeDead. Operand has 198 places, 228 transitions, 464 flow [2023-08-26 16:01:17,193 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 194 places, 223 transitions, 451 flow [2023-08-26 16:01:17,196 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:01:17,203 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 194 places, 223 transitions, 451 flow [2023-08-26 16:01:17,206 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 194 places, 223 transitions, 451 flow [2023-08-26 16:01:17,206 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 194 places, 223 transitions, 451 flow [2023-08-26 16:01:17,250 INFO L124 PetriNetUnfolderBase]: 47/313 cut-off events. [2023-08-26 16:01:17,251 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:01:17,253 INFO L83 FinitePrefix]: Finished finitePrefix Result has 318 conditions, 313 events. 47/313 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 1156 event pairs, 0 based on Foata normal form. 0/221 useless extension candidates. Maximal degree in co-relation 180. Up to 8 conditions per place. [2023-08-26 16:01:17,261 INFO L119 LiptonReduction]: Number of co-enabled transitions 16320 [2023-08-26 16:01:20,989 INFO L134 LiptonReduction]: Checked pairs total: 30424 [2023-08-26 16:01:20,990 INFO L136 LiptonReduction]: Total number of compositions: 213 [2023-08-26 16:01:21,001 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 16:01:21,007 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;@53180cfb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:01:21,007 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 16:01:21,022 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:01:21,025 INFO L124 PetriNetUnfolderBase]: 12/57 cut-off events. [2023-08-26 16:01:21,025 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:01:21,025 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:21,025 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1] [2023-08-26 16:01:21,026 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:21,030 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:21,030 INFO L85 PathProgramCache]: Analyzing trace with hash 2135239003, now seen corresponding path program 1 times [2023-08-26 16:01:21,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:21,038 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [455557450] [2023-08-26 16:01:21,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:21,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:21,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:21,293 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 16:01:21,294 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:21,294 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [455557450] [2023-08-26 16:01:21,294 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [455557450] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:01:21,294 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:01:21,295 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:01:21,296 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477390412] [2023-08-26 16:01:21,296 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:01:21,303 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:01:21,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:21,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:01:21,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:01:21,330 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 187 out of 441 [2023-08-26 16:01:21,334 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 91 transitions, 187 flow. Second operand has 3 states, 3 states have (on average 188.66666666666666) internal successors, (566), 3 states have internal predecessors, (566), 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 16:01:21,334 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:21,334 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 187 of 441 [2023-08-26 16:01:21,335 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:21,559 INFO L124 PetriNetUnfolderBase]: 542/1246 cut-off events. [2023-08-26 16:01:21,559 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:01:21,562 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2315 conditions, 1246 events. 542/1246 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 85. Compared 8132 event pairs, 494 based on Foata normal form. 96/917 useless extension candidates. Maximal degree in co-relation 2243. Up to 1063 conditions per place. [2023-08-26 16:01:21,566 INFO L140 encePairwiseOnDemand]: 409/441 looper letters, 27 selfloop transitions, 2 changer transitions 26/63 dead transitions. [2023-08-26 16:01:21,566 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 64 places, 63 transitions, 231 flow [2023-08-26 16:01:21,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:01:21,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:01:21,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 641 transitions. [2023-08-26 16:01:21,579 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48450491307634164 [2023-08-26 16:01:21,579 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 641 transitions. [2023-08-26 16:01:21,580 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 641 transitions. [2023-08-26 16:01:21,582 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:21,583 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 641 transitions. [2023-08-26 16:01:21,587 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 213.66666666666666) internal successors, (641), 3 states have internal predecessors, (641), 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 16:01:21,592 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 441.0) internal successors, (1764), 4 states have internal predecessors, (1764), 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 16:01:21,593 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 441.0) internal successors, (1764), 4 states have internal predecessors, (1764), 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 16:01:21,595 INFO L175 Difference]: Start difference. First operand has 69 places, 91 transitions, 187 flow. Second operand 3 states and 641 transitions. [2023-08-26 16:01:21,596 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 64 places, 63 transitions, 231 flow [2023-08-26 16:01:21,598 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 64 places, 63 transitions, 231 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 16:01:21,599 INFO L231 Difference]: Finished difference. Result has 65 places, 37 transitions, 89 flow [2023-08-26 16:01:21,601 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=441, 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 16:01:21,604 INFO L281 CegarLoopForPetriNet]: 69 programPoint places, -4 predicate places. [2023-08-26 16:01:21,604 INFO L495 AbstractCegarLoop]: Abstraction has has 65 places, 37 transitions, 89 flow [2023-08-26 16:01:21,604 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 188.66666666666666) internal successors, (566), 3 states have internal predecessors, (566), 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 16:01:21,605 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:21,605 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2023-08-26 16:01:21,605 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 16:01:21,605 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:21,606 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:21,606 INFO L85 PathProgramCache]: Analyzing trace with hash 1456270241, now seen corresponding path program 1 times [2023-08-26 16:01:21,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:21,606 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224684383] [2023-08-26 16:01:21,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:21,606 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:21,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:21,707 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 16:01:21,707 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:21,707 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224684383] [2023-08-26 16:01:21,707 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224684383] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:01:21,708 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992347056] [2023-08-26 16:01:21,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:21,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:21,708 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:21,711 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 16:01:21,721 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 16:01:21,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:21,802 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-26 16:01:21,806 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:01:21,837 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 16:01:21,837 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:01:21,852 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 16:01:21,853 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992347056] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:01:21,853 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:01:21,853 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-26 16:01:21,854 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384647889] [2023-08-26 16:01:21,854 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:01:21,854 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 16:01:21,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:21,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 16:01:21,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-26 16:01:21,857 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 187 out of 441 [2023-08-26 16:01:21,859 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 65 places, 37 transitions, 89 flow. Second operand has 7 states, 7 states have (on average 188.57142857142858) internal successors, (1320), 7 states have internal predecessors, (1320), 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 16:01:21,859 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:21,859 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 187 of 441 [2023-08-26 16:01:21,859 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:21,943 INFO L124 PetriNetUnfolderBase]: 102/269 cut-off events. [2023-08-26 16:01:21,943 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:01:21,944 INFO L83 FinitePrefix]: Finished finitePrefix Result has 511 conditions, 269 events. 102/269 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 29. Compared 1136 event pairs, 95 based on Foata normal form. 0/163 useless extension candidates. Maximal degree in co-relation 499. Up to 223 conditions per place. [2023-08-26 16:01:21,945 INFO L140 encePairwiseOnDemand]: 438/441 looper letters, 27 selfloop transitions, 5 changer transitions 0/40 dead transitions. [2023-08-26 16:01:21,945 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 40 transitions, 165 flow [2023-08-26 16:01:21,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 16:01:21,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 16:01:21,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1157 transitions. [2023-08-26 16:01:21,948 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43726379440665153 [2023-08-26 16:01:21,948 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1157 transitions. [2023-08-26 16:01:21,948 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1157 transitions. [2023-08-26 16:01:21,949 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:21,949 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1157 transitions. [2023-08-26 16:01:21,951 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 192.83333333333334) internal successors, (1157), 6 states have internal predecessors, (1157), 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 16:01:21,956 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 441.0) internal successors, (3087), 7 states have internal predecessors, (3087), 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 16:01:21,957 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 441.0) internal successors, (3087), 7 states have internal predecessors, (3087), 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 16:01:21,957 INFO L175 Difference]: Start difference. First operand has 65 places, 37 transitions, 89 flow. Second operand 6 states and 1157 transitions. [2023-08-26 16:01:21,958 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 40 transitions, 165 flow [2023-08-26 16:01:21,958 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 44 places, 40 transitions, 161 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-26 16:01:21,959 INFO L231 Difference]: Finished difference. Result has 47 places, 40 transitions, 121 flow [2023-08-26 16:01:21,959 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=441, 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 16:01:21,960 INFO L281 CegarLoopForPetriNet]: 69 programPoint places, -22 predicate places. [2023-08-26 16:01:21,960 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 40 transitions, 121 flow [2023-08-26 16:01:21,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 188.57142857142858) internal successors, (1320), 7 states have internal predecessors, (1320), 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 16:01:21,961 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:21,962 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:21,973 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 16:01:22,168 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 16:01:22,168 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:22,169 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:22,169 INFO L85 PathProgramCache]: Analyzing trace with hash 71731931, now seen corresponding path program 2 times [2023-08-26 16:01:22,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:22,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423917767] [2023-08-26 16:01:22,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:22,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:22,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:22,278 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 16:01:22,278 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:22,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423917767] [2023-08-26 16:01:22,278 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1423917767] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:01:22,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [218062486] [2023-08-26 16:01:22,279 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 16:01:22,279 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:22,279 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:22,280 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 16:01:22,289 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 16:01:22,362 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 16:01:22,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 16:01:22,363 INFO L262 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-26 16:01:22,364 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:01:22,389 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 16:01:22,389 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:01:22,442 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 16:01:22,443 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [218062486] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:01:22,443 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:01:22,443 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-26 16:01:22,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193987277] [2023-08-26 16:01:22,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:01:22,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-26 16:01:22,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:22,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-26 16:01:22,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-26 16:01:22,448 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 187 out of 441 [2023-08-26 16:01:22,451 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 47 places, 40 transitions, 121 flow. Second operand has 13 states, 13 states have (on average 188.30769230769232) internal successors, (2448), 13 states have internal predecessors, (2448), 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 16:01:22,451 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:22,451 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 187 of 441 [2023-08-26 16:01:22,451 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:22,570 INFO L124 PetriNetUnfolderBase]: 102/275 cut-off events. [2023-08-26 16:01:22,571 INFO L125 PetriNetUnfolderBase]: For 20/20 co-relation queries the response was YES. [2023-08-26 16:01:22,571 INFO L83 FinitePrefix]: Finished finitePrefix Result has 548 conditions, 275 events. 102/275 cut-off events. For 20/20 co-relation queries the response was YES. Maximal size of possible extension queue 29. Compared 1136 event pairs, 95 based on Foata normal form. 6/176 useless extension candidates. Maximal degree in co-relation 490. Up to 223 conditions per place. [2023-08-26 16:01:22,572 INFO L140 encePairwiseOnDemand]: 438/441 looper letters, 27 selfloop transitions, 11 changer transitions 0/46 dead transitions. [2023-08-26 16:01:22,572 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 46 transitions, 233 flow [2023-08-26 16:01:22,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-08-26 16:01:22,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-08-26 16:01:22,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 2288 transitions. [2023-08-26 16:01:22,578 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4323507180650038 [2023-08-26 16:01:22,578 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 2288 transitions. [2023-08-26 16:01:22,579 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 2288 transitions. [2023-08-26 16:01:22,580 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:22,580 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 2288 transitions. [2023-08-26 16:01:22,585 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 190.66666666666666) internal successors, (2288), 12 states have internal predecessors, (2288), 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 16:01:22,593 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 441.0) internal successors, (5733), 13 states have internal predecessors, (5733), 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 16:01:22,596 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 441.0) internal successors, (5733), 13 states have internal predecessors, (5733), 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 16:01:22,596 INFO L175 Difference]: Start difference. First operand has 47 places, 40 transitions, 121 flow. Second operand 12 states and 2288 transitions. [2023-08-26 16:01:22,596 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 46 transitions, 233 flow [2023-08-26 16:01:22,598 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 57 places, 46 transitions, 219 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-08-26 16:01:22,599 INFO L231 Difference]: Finished difference. Result has 63 places, 46 transitions, 191 flow [2023-08-26 16:01:22,599 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=441, 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 16:01:22,600 INFO L281 CegarLoopForPetriNet]: 69 programPoint places, -6 predicate places. [2023-08-26 16:01:22,600 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 46 transitions, 191 flow [2023-08-26 16:01:22,601 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 188.30769230769232) internal successors, (2448), 13 states have internal predecessors, (2448), 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 16:01:22,601 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:22,601 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:22,612 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 16:01:22,812 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 16:01:22,812 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:22,813 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:22,813 INFO L85 PathProgramCache]: Analyzing trace with hash 1782494491, now seen corresponding path program 3 times [2023-08-26 16:01:22,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:22,813 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113736943] [2023-08-26 16:01:22,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:22,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:22,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:01:22,867 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 16:01:22,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:01:22,910 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 16:01:22,911 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 16:01:22,911 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 16:01:22,913 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 16:01:22,913 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-08-26 16:01:22,915 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-26 16:01:22,915 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 16:01:22,915 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 16:01:22,957 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 16:01:22,960 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 272 places, 315 transitions, 648 flow [2023-08-26 16:01:23,038 INFO L124 PetriNetUnfolderBase]: 80/522 cut-off events. [2023-08-26 16:01:23,038 INFO L125 PetriNetUnfolderBase]: For 6/8 co-relation queries the response was YES. [2023-08-26 16:01:23,044 INFO L83 FinitePrefix]: Finished finitePrefix Result has 536 conditions, 522 events. 80/522 cut-off events. For 6/8 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2395 event pairs, 0 based on Foata normal form. 0/369 useless extension candidates. Maximal degree in co-relation 320. Up to 12 conditions per place. [2023-08-26 16:01:23,044 INFO L82 GeneralOperation]: Start removeDead. Operand has 272 places, 315 transitions, 648 flow [2023-08-26 16:01:23,048 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 272 places, 315 transitions, 648 flow [2023-08-26 16:01:23,049 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:01:23,049 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 272 places, 315 transitions, 648 flow [2023-08-26 16:01:23,049 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 272 places, 315 transitions, 648 flow [2023-08-26 16:01:23,049 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 272 places, 315 transitions, 648 flow [2023-08-26 16:01:23,102 INFO L124 PetriNetUnfolderBase]: 80/522 cut-off events. [2023-08-26 16:01:23,102 INFO L125 PetriNetUnfolderBase]: For 6/8 co-relation queries the response was YES. [2023-08-26 16:01:23,108 INFO L83 FinitePrefix]: Finished finitePrefix Result has 536 conditions, 522 events. 80/522 cut-off events. For 6/8 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2395 event pairs, 0 based on Foata normal form. 0/369 useless extension candidates. Maximal degree in co-relation 320. Up to 12 conditions per place. [2023-08-26 16:01:23,131 INFO L119 LiptonReduction]: Number of co-enabled transitions 48960 [2023-08-26 16:01:27,521 INFO L134 LiptonReduction]: Checked pairs total: 97395 [2023-08-26 16:01:27,521 INFO L136 LiptonReduction]: Total number of compositions: 291 [2023-08-26 16:01:27,525 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 16:01:27,525 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;@53180cfb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:01:27,525 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 16:01:27,536 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:01:27,536 INFO L124 PetriNetUnfolderBase]: 41/158 cut-off events. [2023-08-26 16:01:27,536 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 16:01:27,536 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:27,537 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:27,537 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:27,537 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:27,537 INFO L85 PathProgramCache]: Analyzing trace with hash 441894105, now seen corresponding path program 1 times [2023-08-26 16:01:27,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:27,538 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493657789] [2023-08-26 16:01:27,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:27,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:27,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:27,563 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 16:01:27,564 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:27,564 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493657789] [2023-08-26 16:01:27,564 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493657789] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:01:27,564 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:01:27,564 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:01:27,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410787208] [2023-08-26 16:01:27,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:01:27,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:01:27,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:27,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:01:27,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:01:27,566 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 258 out of 606 [2023-08-26 16:01:27,567 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 102 places, 136 transitions, 290 flow. Second operand has 3 states, 3 states have (on average 260.0) internal successors, (780), 3 states have internal predecessors, (780), 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 16:01:27,567 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:27,567 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 258 of 606 [2023-08-26 16:01:27,567 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:30,637 INFO L124 PetriNetUnfolderBase]: 22825/38051 cut-off events. [2023-08-26 16:01:30,637 INFO L125 PetriNetUnfolderBase]: For 132/132 co-relation queries the response was YES. [2023-08-26 16:01:30,704 INFO L83 FinitePrefix]: Finished finitePrefix Result has 71674 conditions, 38051 events. 22825/38051 cut-off events. For 132/132 co-relation queries the response was YES. Maximal size of possible extension queue 1545. Compared 320296 event pairs, 21546 based on Foata normal form. 3152/29199 useless extension candidates. Maximal degree in co-relation 30523. Up to 33499 conditions per place. [2023-08-26 16:01:30,753 INFO L140 encePairwiseOnDemand]: 562/606 looper letters, 47 selfloop transitions, 2 changer transitions 31/96 dead transitions. [2023-08-26 16:01:30,753 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 96 places, 96 transitions, 358 flow [2023-08-26 16:01:30,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:01:30,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:01:30,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 890 transitions. [2023-08-26 16:01:30,756 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48954895489548955 [2023-08-26 16:01:30,756 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 890 transitions. [2023-08-26 16:01:30,756 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 890 transitions. [2023-08-26 16:01:30,757 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:30,757 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 890 transitions. [2023-08-26 16:01:30,759 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 296.6666666666667) internal successors, (890), 3 states have internal predecessors, (890), 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 16:01:30,762 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 606.0) internal successors, (2424), 4 states have internal predecessors, (2424), 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 16:01:30,762 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 606.0) internal successors, (2424), 4 states have internal predecessors, (2424), 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 16:01:30,762 INFO L175 Difference]: Start difference. First operand has 102 places, 136 transitions, 290 flow. Second operand 3 states and 890 transitions. [2023-08-26 16:01:30,763 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 96 places, 96 transitions, 358 flow [2023-08-26 16:01:30,770 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 96 places, 96 transitions, 358 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 16:01:30,772 INFO L231 Difference]: Finished difference. Result has 97 places, 65 transitions, 152 flow [2023-08-26 16:01:30,772 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=606, 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 16:01:30,774 INFO L281 CegarLoopForPetriNet]: 102 programPoint places, -5 predicate places. [2023-08-26 16:01:30,774 INFO L495 AbstractCegarLoop]: Abstraction has has 97 places, 65 transitions, 152 flow [2023-08-26 16:01:30,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 260.0) internal successors, (780), 3 states have internal predecessors, (780), 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 16:01:30,775 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:30,775 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 16:01:30,775 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 16:01:30,775 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:30,775 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:30,775 INFO L85 PathProgramCache]: Analyzing trace with hash 1565852261, now seen corresponding path program 1 times [2023-08-26 16:01:30,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:30,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761098669] [2023-08-26 16:01:30,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:30,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:30,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:30,830 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 16:01:30,830 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:30,831 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761098669] [2023-08-26 16:01:30,831 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761098669] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:01:30,831 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094407958] [2023-08-26 16:01:30,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:30,831 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:30,831 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:30,833 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 16:01:30,834 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 16:01:30,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:30,945 INFO L262 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-26 16:01:30,946 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:01:30,959 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 16:01:30,959 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:01:30,974 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 16:01:30,976 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1094407958] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:01:30,977 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:01:30,977 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-26 16:01:30,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305510828] [2023-08-26 16:01:30,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:01:30,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 16:01:30,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:30,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 16:01:30,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-26 16:01:30,979 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 258 out of 606 [2023-08-26 16:01:30,981 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 97 places, 65 transitions, 152 flow. Second operand has 7 states, 7 states have (on average 259.7142857142857) internal successors, (1818), 7 states have internal predecessors, (1818), 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 16:01:30,982 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:30,982 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 258 of 606 [2023-08-26 16:01:30,982 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:31,574 INFO L124 PetriNetUnfolderBase]: 4492/7777 cut-off events. [2023-08-26 16:01:31,575 INFO L125 PetriNetUnfolderBase]: For 66/66 co-relation queries the response was YES. [2023-08-26 16:01:31,585 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14675 conditions, 7777 events. 4492/7777 cut-off events. For 66/66 co-relation queries the response was YES. Maximal size of possible extension queue 361. Compared 54572 event pairs, 4275 based on Foata normal form. 0/5054 useless extension candidates. Maximal degree in co-relation 14662. Up to 6803 conditions per place. [2023-08-26 16:01:31,603 INFO L140 encePairwiseOnDemand]: 603/606 looper letters, 47 selfloop transitions, 5 changer transitions 0/68 dead transitions. [2023-08-26 16:01:31,604 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 68 transitions, 268 flow [2023-08-26 16:01:31,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 16:01:31,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 16:01:31,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1603 transitions. [2023-08-26 16:01:31,609 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44086908690869087 [2023-08-26 16:01:31,609 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1603 transitions. [2023-08-26 16:01:31,609 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1603 transitions. [2023-08-26 16:01:31,610 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:31,610 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1603 transitions. [2023-08-26 16:01:31,614 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 267.1666666666667) internal successors, (1603), 6 states have internal predecessors, (1603), 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 16:01:31,619 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 606.0) internal successors, (4242), 7 states have internal predecessors, (4242), 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 16:01:31,620 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 606.0) internal successors, (4242), 7 states have internal predecessors, (4242), 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 16:01:31,620 INFO L175 Difference]: Start difference. First operand has 97 places, 65 transitions, 152 flow. Second operand 6 states and 1603 transitions. [2023-08-26 16:01:31,620 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 68 transitions, 268 flow [2023-08-26 16:01:31,621 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 68 transitions, 262 flow, removed 2 selfloop flow, removed 1 redundant places. [2023-08-26 16:01:31,622 INFO L231 Difference]: Finished difference. Result has 76 places, 68 transitions, 182 flow [2023-08-26 16:01:31,622 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=606, 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 16:01:31,623 INFO L281 CegarLoopForPetriNet]: 102 programPoint places, -26 predicate places. [2023-08-26 16:01:31,623 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 68 transitions, 182 flow [2023-08-26 16:01:31,624 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 259.7142857142857) internal successors, (1818), 7 states have internal predecessors, (1818), 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 16:01:31,624 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:31,624 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:31,630 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-08-26 16:01:31,829 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 16:01:31,830 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:31,830 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:31,830 INFO L85 PathProgramCache]: Analyzing trace with hash 113231833, now seen corresponding path program 2 times [2023-08-26 16:01:31,830 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:31,830 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806397372] [2023-08-26 16:01:31,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:31,830 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:31,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:31,915 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 16:01:31,915 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:31,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806397372] [2023-08-26 16:01:31,916 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1806397372] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:01:31,916 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313398068] [2023-08-26 16:01:31,916 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 16:01:31,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:31,916 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:31,917 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 16:01:31,921 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 16:01:32,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 16:01:32,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 16:01:32,023 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-26 16:01:32,025 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:01:32,037 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 16:01:32,038 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:01:32,079 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 16:01:32,079 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [313398068] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:01:32,079 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:01:32,080 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-26 16:01:32,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725355928] [2023-08-26 16:01:32,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:01:32,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-26 16:01:32,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:32,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-26 16:01:32,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-26 16:01:32,083 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 258 out of 606 [2023-08-26 16:01:32,086 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 68 transitions, 182 flow. Second operand has 13 states, 13 states have (on average 259.38461538461536) internal successors, (3372), 13 states have internal predecessors, (3372), 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 16:01:32,086 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:32,086 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 258 of 606 [2023-08-26 16:01:32,086 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:32,626 INFO L124 PetriNetUnfolderBase]: 4492/7783 cut-off events. [2023-08-26 16:01:32,626 INFO L125 PetriNetUnfolderBase]: For 78/78 co-relation queries the response was YES. [2023-08-26 16:01:32,639 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14704 conditions, 7783 events. 4492/7783 cut-off events. For 78/78 co-relation queries the response was YES. Maximal size of possible extension queue 361. Compared 54599 event pairs, 4275 based on Foata normal form. 6/5067 useless extension candidates. Maximal degree in co-relation 14645. Up to 6803 conditions per place. [2023-08-26 16:01:32,659 INFO L140 encePairwiseOnDemand]: 603/606 looper letters, 47 selfloop transitions, 11 changer transitions 0/74 dead transitions. [2023-08-26 16:01:32,659 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 87 places, 74 transitions, 334 flow [2023-08-26 16:01:32,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-08-26 16:01:32,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-08-26 16:01:32,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 3160 transitions. [2023-08-26 16:01:32,669 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43454345434543457 [2023-08-26 16:01:32,669 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 3160 transitions. [2023-08-26 16:01:32,669 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 3160 transitions. [2023-08-26 16:01:32,671 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:32,671 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 3160 transitions. [2023-08-26 16:01:32,677 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 263.3333333333333) internal successors, (3160), 12 states have internal predecessors, (3160), 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 16:01:32,685 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 606.0) internal successors, (7878), 13 states have internal predecessors, (7878), 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 16:01:32,687 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 606.0) internal successors, (7878), 13 states have internal predecessors, (7878), 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 16:01:32,687 INFO L175 Difference]: Start difference. First operand has 76 places, 68 transitions, 182 flow. Second operand 12 states and 3160 transitions. [2023-08-26 16:01:32,687 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 87 places, 74 transitions, 334 flow [2023-08-26 16:01:32,690 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 86 places, 74 transitions, 320 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-08-26 16:01:32,692 INFO L231 Difference]: Finished difference. Result has 92 places, 74 transitions, 252 flow [2023-08-26 16:01:32,692 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=606, 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 16:01:32,693 INFO L281 CegarLoopForPetriNet]: 102 programPoint places, -10 predicate places. [2023-08-26 16:01:32,693 INFO L495 AbstractCegarLoop]: Abstraction has has 92 places, 74 transitions, 252 flow [2023-08-26 16:01:32,695 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 259.38461538461536) internal successors, (3372), 13 states have internal predecessors, (3372), 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 16:01:32,695 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:32,696 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 3, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:32,705 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 16:01:32,904 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 16:01:32,904 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:32,905 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:32,905 INFO L85 PathProgramCache]: Analyzing trace with hash -592610215, now seen corresponding path program 3 times [2023-08-26 16:01:32,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:32,905 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668245211] [2023-08-26 16:01:32,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:32,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:32,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:01:32,923 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 16:01:32,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:01:32,947 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 16:01:32,948 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 16:01:32,948 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 16:01:32,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 16:01:32,948 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-08-26 16:01:32,949 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-26 16:01:32,949 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 16:01:32,949 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 16:01:33,003 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 16:01:33,007 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 346 places, 402 transitions, 834 flow [2023-08-26 16:01:33,115 INFO L124 PetriNetUnfolderBase]: 117/763 cut-off events. [2023-08-26 16:01:33,115 INFO L125 PetriNetUnfolderBase]: For 19/22 co-relation queries the response was YES. [2023-08-26 16:01:33,126 INFO L83 FinitePrefix]: Finished finitePrefix Result has 791 conditions, 763 events. 117/763 cut-off events. For 19/22 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 3821 event pairs, 1 based on Foata normal form. 0/541 useless extension candidates. Maximal degree in co-relation 530. Up to 16 conditions per place. [2023-08-26 16:01:33,126 INFO L82 GeneralOperation]: Start removeDead. Operand has 346 places, 402 transitions, 834 flow [2023-08-26 16:01:33,134 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 346 places, 402 transitions, 834 flow [2023-08-26 16:01:33,134 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:01:33,135 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 346 places, 402 transitions, 834 flow [2023-08-26 16:01:33,135 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 346 places, 402 transitions, 834 flow [2023-08-26 16:01:33,135 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 346 places, 402 transitions, 834 flow [2023-08-26 16:01:33,229 INFO L124 PetriNetUnfolderBase]: 117/763 cut-off events. [2023-08-26 16:01:33,229 INFO L125 PetriNetUnfolderBase]: For 19/22 co-relation queries the response was YES. [2023-08-26 16:01:33,240 INFO L83 FinitePrefix]: Finished finitePrefix Result has 791 conditions, 763 events. 117/763 cut-off events. For 19/22 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 3821 event pairs, 1 based on Foata normal form. 0/541 useless extension candidates. Maximal degree in co-relation 530. Up to 16 conditions per place. [2023-08-26 16:01:33,270 INFO L119 LiptonReduction]: Number of co-enabled transitions 95880 [2023-08-26 16:01:38,671 INFO L134 LiptonReduction]: Checked pairs total: 192639 [2023-08-26 16:01:38,671 INFO L136 LiptonReduction]: Total number of compositions: 376 [2023-08-26 16:01:38,673 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 16:01:38,673 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;@53180cfb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:01:38,673 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 16:01:38,684 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:01:38,684 INFO L124 PetriNetUnfolderBase]: 62/244 cut-off events. [2023-08-26 16:01:38,684 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 16:01:38,684 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:38,684 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-08-26 16:01:38,685 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:38,685 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:38,685 INFO L85 PathProgramCache]: Analyzing trace with hash 497599104, now seen corresponding path program 1 times [2023-08-26 16:01:38,685 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:38,685 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808081517] [2023-08-26 16:01:38,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:38,685 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:38,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:38,720 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 16:01:38,721 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:38,721 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808081517] [2023-08-26 16:01:38,721 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808081517] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:01:38,721 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:01:38,721 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:01:38,721 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833873256] [2023-08-26 16:01:38,721 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:01:38,721 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:01:38,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:38,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:01:38,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:01:38,723 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 329 out of 778 [2023-08-26 16:01:38,724 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 132 places, 175 transitions, 380 flow. Second operand has 3 states, 3 states have (on average 331.3333333333333) internal successors, (994), 3 states have internal predecessors, (994), 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 16:01:38,724 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:38,724 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 329 of 778 [2023-08-26 16:01:38,724 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:02:50,625 INFO L124 PetriNetUnfolderBase]: 758121/1080698 cut-off events. [2023-08-26 16:02:50,625 INFO L125 PetriNetUnfolderBase]: For 5917/5917 co-relation queries the response was YES. [2023-08-26 16:02:52,548 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2080011 conditions, 1080698 events. 758121/1080698 cut-off events. For 5917/5917 co-relation queries the response was YES. Maximal size of possible extension queue 34172. Compared 10241697 event pairs, 730010 based on Foata normal form. 93714/790932 useless extension candidates. Maximal degree in co-relation 243365. Up to 995663 conditions per place. [2023-08-26 16:02:53,742 INFO L140 encePairwiseOnDemand]: 723/778 looper letters, 69 selfloop transitions, 2 changer transitions 32/124 dead transitions. [2023-08-26 16:02:53,742 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 124 places, 124 transitions, 472 flow [2023-08-26 16:02:53,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:02:53,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:02:53,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1137 transitions. [2023-08-26 16:02:53,747 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.487146529562982 [2023-08-26 16:02:53,747 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1137 transitions. [2023-08-26 16:02:53,747 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1137 transitions. [2023-08-26 16:02:53,747 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:02:53,748 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1137 transitions. [2023-08-26 16:02:53,751 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 379.0) internal successors, (1137), 3 states have internal predecessors, (1137), 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 16:02:53,754 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 778.0) internal successors, (3112), 4 states have internal predecessors, (3112), 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 16:02:53,766 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 778.0) internal successors, (3112), 4 states have internal predecessors, (3112), 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 16:02:53,766 INFO L175 Difference]: Start difference. First operand has 132 places, 175 transitions, 380 flow. Second operand 3 states and 1137 transitions. [2023-08-26 16:02:53,766 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 124 places, 124 transitions, 472 flow [2023-08-26 16:02:53,772 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 16:02:53,776 INFO L231 Difference]: Finished difference. Result has 125 places, 92 transitions, 215 flow [2023-08-26 16:02:53,777 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=778, 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 16:02:53,778 INFO L281 CegarLoopForPetriNet]: 132 programPoint places, -7 predicate places. [2023-08-26 16:02:53,778 INFO L495 AbstractCegarLoop]: Abstraction has has 125 places, 92 transitions, 215 flow [2023-08-26 16:02:53,779 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 331.3333333333333) internal successors, (994), 3 states have internal predecessors, (994), 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 16:02:53,779 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:02:53,779 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:02:53,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 16:02:53,779 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:02:53,779 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:02:53,779 INFO L85 PathProgramCache]: Analyzing trace with hash -1553503490, now seen corresponding path program 1 times [2023-08-26 16:02:53,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:02:53,781 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075198888] [2023-08-26 16:02:53,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:02:53,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:02:53,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:02:53,838 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 16:02:53,838 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:02:53,838 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075198888] [2023-08-26 16:02:53,838 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075198888] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:02:53,838 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [211958651] [2023-08-26 16:02:53,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:02:53,839 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:02:53,839 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:02:53,841 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 16:02:53,842 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 16:02:53,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:02:53,945 INFO L262 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-26 16:02:53,946 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:02:53,955 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 16:02:53,955 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:02:53,972 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 16:02:53,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [211958651] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:02:53,973 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:02:53,973 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-26 16:02:53,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929544516] [2023-08-26 16:02:53,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:02:53,974 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 16:02:53,974 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:02:53,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 16:02:53,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-26 16:02:53,976 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 329 out of 778 [2023-08-26 16:02:53,977 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 125 places, 92 transitions, 215 flow. Second operand has 7 states, 7 states have (on average 330.85714285714283) internal successors, (2316), 7 states have internal predecessors, (2316), 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 16:02:53,977 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:02:53,977 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 329 of 778 [2023-08-26 16:02:53,978 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:03:07,188 INFO L124 PetriNetUnfolderBase]: 152906/220679 cut-off events. [2023-08-26 16:03:07,188 INFO L125 PetriNetUnfolderBase]: For 3043/3043 co-relation queries the response was YES. [2023-08-26 16:03:07,612 INFO L83 FinitePrefix]: Finished finitePrefix Result has 425665 conditions, 220679 events. 152906/220679 cut-off events. For 3043/3043 co-relation queries the response was YES. Maximal size of possible extension queue 8010. Compared 1851584 event pairs, 147163 based on Foata normal form. 0/135910 useless extension candidates. Maximal degree in co-relation 425651. Up to 202731 conditions per place. [2023-08-26 16:03:08,177 INFO L140 encePairwiseOnDemand]: 775/778 looper letters, 69 selfloop transitions, 5 changer transitions 0/95 dead transitions. [2023-08-26 16:03:08,178 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 102 places, 95 transitions, 375 flow [2023-08-26 16:03:08,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 16:03:08,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 16:03:08,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 2051 transitions. [2023-08-26 16:03:08,183 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4393744644387318 [2023-08-26 16:03:08,183 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 2051 transitions. [2023-08-26 16:03:08,183 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 2051 transitions. [2023-08-26 16:03:08,184 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:03:08,184 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 2051 transitions. [2023-08-26 16:03:08,187 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 341.8333333333333) internal successors, (2051), 6 states have internal predecessors, (2051), 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 16:03:08,192 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 778.0) internal successors, (5446), 7 states have internal predecessors, (5446), 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 16:03:08,193 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 778.0) internal successors, (5446), 7 states have internal predecessors, (5446), 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 16:03:08,193 INFO L175 Difference]: Start difference. First operand has 125 places, 92 transitions, 215 flow. Second operand 6 states and 2051 transitions. [2023-08-26 16:03:08,196 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 102 places, 95 transitions, 375 flow [2023-08-26 16:03:08,199 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 101 places, 95 transitions, 365 flow, removed 4 selfloop flow, removed 1 redundant places. [2023-08-26 16:03:08,200 INFO L231 Difference]: Finished difference. Result has 104 places, 95 transitions, 241 flow [2023-08-26 16:03:08,200 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=778, 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 16:03:08,203 INFO L281 CegarLoopForPetriNet]: 132 programPoint places, -28 predicate places. [2023-08-26 16:03:08,203 INFO L495 AbstractCegarLoop]: Abstraction has has 104 places, 95 transitions, 241 flow [2023-08-26 16:03:08,203 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 330.85714285714283) internal successors, (2316), 7 states have internal predecessors, (2316), 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 16:03:08,204 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:03:08,204 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-08-26 16:03:08,211 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-08-26 16:03:08,411 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 16:03:08,412 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:03:08,412 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:03:08,413 INFO L85 PathProgramCache]: Analyzing trace with hash -330436096, now seen corresponding path program 2 times [2023-08-26 16:03:08,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:03:08,413 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084759831] [2023-08-26 16:03:08,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:03:08,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:03:08,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:03:08,496 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 16:03:08,496 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:03:08,496 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084759831] [2023-08-26 16:03:08,496 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084759831] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:03:08,496 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36891787] [2023-08-26 16:03:08,496 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 16:03:08,496 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:03:08,497 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:03:08,498 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 16:03:08,500 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 16:03:08,591 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 16:03:08,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 16:03:08,592 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-26 16:03:08,593 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:03:08,613 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 16:03:08,614 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:03:08,653 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 16:03:08,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36891787] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:03:08,654 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:03:08,654 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-26 16:03:08,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164837583] [2023-08-26 16:03:08,654 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:03:08,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-26 16:03:08,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:03:08,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-26 16:03:08,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-26 16:03:08,658 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 329 out of 778 [2023-08-26 16:03:08,660 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 104 places, 95 transitions, 241 flow. Second operand has 13 states, 13 states have (on average 330.46153846153845) internal successors, (4296), 13 states have internal predecessors, (4296), 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 16:03:08,660 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:03:08,661 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 329 of 778 [2023-08-26 16:03:08,661 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:03:22,385 INFO L124 PetriNetUnfolderBase]: 152906/220685 cut-off events. [2023-08-26 16:03:22,386 INFO L125 PetriNetUnfolderBase]: For 1318/1318 co-relation queries the response was YES. [2023-08-26 16:03:22,986 INFO L83 FinitePrefix]: Finished finitePrefix Result has 424952 conditions, 220685 events. 152906/220685 cut-off events. For 1318/1318 co-relation queries the response was YES. Maximal size of possible extension queue 8010. Compared 1851371 event pairs, 147163 based on Foata normal form. 6/135923 useless extension candidates. Maximal degree in co-relation 424892. Up to 202731 conditions per place. [2023-08-26 16:03:23,334 INFO L140 encePairwiseOnDemand]: 775/778 looper letters, 69 selfloop transitions, 11 changer transitions 0/101 dead transitions. [2023-08-26 16:03:23,334 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 115 places, 101 transitions, 437 flow [2023-08-26 16:03:23,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-08-26 16:03:23,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-08-26 16:03:23,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 4034 transitions. [2023-08-26 16:03:23,343 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43209083119108826 [2023-08-26 16:03:23,343 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 4034 transitions. [2023-08-26 16:03:23,343 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 4034 transitions. [2023-08-26 16:03:23,345 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:03:23,345 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 4034 transitions. [2023-08-26 16:03:23,351 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 336.1666666666667) internal successors, (4034), 12 states have internal predecessors, (4034), 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 16:03:23,362 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 778.0) internal successors, (10114), 13 states have internal predecessors, (10114), 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 16:03:23,364 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 778.0) internal successors, (10114), 13 states have internal predecessors, (10114), 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 16:03:23,364 INFO L175 Difference]: Start difference. First operand has 104 places, 95 transitions, 241 flow. Second operand 12 states and 4034 transitions. [2023-08-26 16:03:23,364 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 115 places, 101 transitions, 437 flow [2023-08-26 16:03:23,365 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 114 places, 101 transitions, 423 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-08-26 16:03:23,366 INFO L231 Difference]: Finished difference. Result has 120 places, 101 transitions, 311 flow [2023-08-26 16:03:23,367 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=778, 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 16:03:23,367 INFO L281 CegarLoopForPetriNet]: 132 programPoint places, -12 predicate places. [2023-08-26 16:03:23,367 INFO L495 AbstractCegarLoop]: Abstraction has has 120 places, 101 transitions, 311 flow [2023-08-26 16:03:23,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 330.46153846153845) internal successors, (4296), 13 states have internal predecessors, (4296), 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 16:03:23,368 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:03:23,369 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-08-26 16:03:23,378 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 16:03:23,575 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 16:03:23,575 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:03:23,575 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:03:23,576 INFO L85 PathProgramCache]: Analyzing trace with hash -965168832, now seen corresponding path program 3 times [2023-08-26 16:03:23,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:03:23,576 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368745741] [2023-08-26 16:03:23,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:03:23,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:03:23,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:03:23,601 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 16:03:23,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:03:23,641 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 16:03:23,641 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 16:03:23,641 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 16:03:23,641 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 16:03:23,641 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-08-26 16:03:23,642 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-26 16:03:23,642 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 16:03:23,642 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 16:03:23,686 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 16:03:23,690 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 420 places, 489 transitions, 1022 flow [2023-08-26 16:03:24,039 INFO L124 PetriNetUnfolderBase]: 166/1080 cut-off events. [2023-08-26 16:03:24,039 INFO L125 PetriNetUnfolderBase]: For 48/52 co-relation queries the response was YES. [2023-08-26 16:03:24,053 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1135 conditions, 1080 events. 166/1080 cut-off events. For 48/52 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 5817 event pairs, 6 based on Foata normal form. 0/773 useless extension candidates. Maximal degree in co-relation 783. Up to 32 conditions per place. [2023-08-26 16:03:24,053 INFO L82 GeneralOperation]: Start removeDead. Operand has 420 places, 489 transitions, 1022 flow [2023-08-26 16:03:24,062 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 420 places, 489 transitions, 1022 flow [2023-08-26 16:03:24,062 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:03:24,062 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 420 places, 489 transitions, 1022 flow [2023-08-26 16:03:24,063 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 420 places, 489 transitions, 1022 flow [2023-08-26 16:03:24,063 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 420 places, 489 transitions, 1022 flow [2023-08-26 16:03:24,207 INFO L124 PetriNetUnfolderBase]: 166/1080 cut-off events. [2023-08-26 16:03:24,208 INFO L125 PetriNetUnfolderBase]: For 48/52 co-relation queries the response was YES. [2023-08-26 16:03:24,224 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1135 conditions, 1080 events. 166/1080 cut-off events. For 48/52 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 5817 event pairs, 6 based on Foata normal form. 0/773 useless extension candidates. Maximal degree in co-relation 783. Up to 32 conditions per place. [2023-08-26 16:03:24,285 INFO L119 LiptonReduction]: Number of co-enabled transitions 157760 [2023-08-26 16:03:30,073 INFO L134 LiptonReduction]: Checked pairs total: 355376 [2023-08-26 16:03:30,073 INFO L136 LiptonReduction]: Total number of compositions: 457 [2023-08-26 16:03:30,075 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 16:03:30,075 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;@53180cfb, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:03:30,075 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 16:03:30,100 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:03:30,101 INFO L124 PetriNetUnfolderBase]: 87/348 cut-off events. [2023-08-26 16:03:30,101 INFO L125 PetriNetUnfolderBase]: For 23/23 co-relation queries the response was YES. [2023-08-26 16:03:30,101 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:03:30,101 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:03:30,101 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:03:30,101 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:03:30,101 INFO L85 PathProgramCache]: Analyzing trace with hash 126057815, now seen corresponding path program 1 times [2023-08-26 16:03:30,102 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:03:30,102 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989350386] [2023-08-26 16:03:30,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:03:30,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:03:30,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:03:30,131 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 16:03:30,131 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:03:30,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989350386] [2023-08-26 16:03:30,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989350386] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:03:30,131 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:03:30,131 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:03:30,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108079692] [2023-08-26 16:03:30,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:03:30,132 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:03:30,132 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:03:30,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:03:30,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:03:30,133 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 400 out of 946 [2023-08-26 16:03:30,134 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 162 places, 216 transitions, 476 flow. Second operand has 3 states, 3 states have (on average 402.6666666666667) internal successors, (1208), 3 states have internal predecessors, (1208), 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 16:03:30,134 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:03:30,134 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 400 of 946 [2023-08-26 16:03:30,134 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand