/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_77-tricky_address4_racing.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 16:01:33,109 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 16:01:33,177 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 16:01:33,180 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 16:01:33,180 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 16:01:33,206 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 16:01:33,207 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 16:01:33,210 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 16:01:33,211 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 16:01:33,214 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 16:01:33,214 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 16:01:33,214 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 16:01:33,214 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 16:01:33,215 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 16:01:33,215 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 16:01:33,215 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 16:01:33,215 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 16:01:33,215 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 16:01:33,216 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 16:01:33,216 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 16:01:33,216 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 16:01:33,216 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 16:01:33,217 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 16:01:33,217 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 16:01:33,217 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 16:01:33,217 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 16:01:33,217 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 16:01:33,217 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 16:01:33,218 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 16:01:33,218 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 16:01:33,218 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 16:01:33,219 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 16:01:33,219 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 16:01:33,219 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 16:01:33,219 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 16:01:33,219 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> INSUFFICIENT_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 16:01:33,463 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 16:01:33,485 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 16:01:33,486 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 16:01:33,487 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 16:01:33,488 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 16:01:33,489 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_77-tricky_address4_racing.i [2023-08-26 16:01:34,402 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 16:01:34,588 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 16:01:34,594 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_77-tricky_address4_racing.i [2023-08-26 16:01:34,606 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d599c54ed/7ae46b0cda614c9598903153424484f3/FLAG73d06d973 [2023-08-26 16:01:34,617 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d599c54ed/7ae46b0cda614c9598903153424484f3 [2023-08-26 16:01:34,618 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 16:01:34,619 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 16:01:34,620 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 16:01:34,620 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 16:01:34,622 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 16:01:34,622 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 04:01:34" (1/1) ... [2023-08-26 16:01:34,622 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@457e43c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:34, skipping insertion in model container [2023-08-26 16:01:34,623 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 04:01:34" (1/1) ... [2023-08-26 16:01:34,659 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 16:01:34,982 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 16:01:35,001 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 16:01:35,021 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 16:01:35,022 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 16:01:35,027 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: unsigned short [736] [2023-08-26 16:01:35,037 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 16:01:35,116 INFO L206 MainTranslator]: Completed translation [2023-08-26 16:01:35,116 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35 WrapperNode [2023-08-26 16:01:35,117 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 16:01:35,118 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 16:01:35,118 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 16:01:35,118 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 16:01:35,122 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35" (1/1) ... [2023-08-26 16:01:35,153 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35" (1/1) ... [2023-08-26 16:01:35,172 INFO L138 Inliner]: procedures = 270, calls = 42, calls flagged for inlining = 7, calls inlined = 8, statements flattened = 202 [2023-08-26 16:01:35,172 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 16:01:35,173 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 16:01:35,173 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 16:01:35,173 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 16:01:35,178 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35" (1/1) ... [2023-08-26 16:01:35,178 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35" (1/1) ... [2023-08-26 16:01:35,180 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35" (1/1) ... [2023-08-26 16:01:35,181 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35" (1/1) ... [2023-08-26 16:01:35,191 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35" (1/1) ... [2023-08-26 16:01:35,194 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35" (1/1) ... [2023-08-26 16:01:35,196 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35" (1/1) ... [2023-08-26 16:01:35,197 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35" (1/1) ... [2023-08-26 16:01:35,200 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 16:01:35,201 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 16:01:35,201 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 16:01:35,201 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 16:01:35,205 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35" (1/1) ... [2023-08-26 16:01:35,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 16:01:35,219 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:35,229 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 16:01:35,235 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 16:01:35,257 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 16:01:35,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 16:01:35,257 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 16:01:35,257 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 16:01:35,257 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 16:01:35,257 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 16:01:35,258 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 16:01:35,258 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 16:01:35,258 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 16:01:35,258 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 16:01:35,259 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 16:01:35,260 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 16:01:35,370 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 16:01:35,372 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 16:01:35,649 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 16:01:35,655 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 16:01:35,655 INFO L302 CfgBuilder]: Removed 23 assume(true) statements. [2023-08-26 16:01:35,656 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 04:01:35 BoogieIcfgContainer [2023-08-26 16:01:35,656 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 16:01:35,658 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 16:01:35,658 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 16:01:35,662 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 16:01:35,663 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 04:01:34" (1/3) ... [2023-08-26 16:01:35,663 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c72795d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 04:01:35, skipping insertion in model container [2023-08-26 16:01:35,663 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:01:35" (2/3) ... [2023-08-26 16:01:35,663 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c72795d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 04:01:35, skipping insertion in model container [2023-08-26 16:01:35,664 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 04:01:35" (3/3) ... [2023-08-26 16:01:35,665 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_77-tricky_address4_racing.i [2023-08-26 16:01:35,677 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 16:01:35,677 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 26 error locations. [2023-08-26 16:01:35,677 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 16:01:35,758 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 16:01:35,792 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 198 places, 228 transitions, 464 flow [2023-08-26 16:01:35,893 INFO L124 PetriNetUnfolderBase]: 48/318 cut-off events. [2023-08-26 16:01:35,893 INFO L125 PetriNetUnfolderBase]: For 1/2 co-relation queries the response was YES. [2023-08-26 16:01:35,902 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 16:01:35,902 INFO L82 GeneralOperation]: Start removeDead. Operand has 198 places, 228 transitions, 464 flow [2023-08-26 16:01:35,911 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 194 places, 223 transitions, 451 flow [2023-08-26 16:01:35,914 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:01:35,923 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 194 places, 223 transitions, 451 flow [2023-08-26 16:01:35,926 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 194 places, 223 transitions, 451 flow [2023-08-26 16:01:35,926 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 194 places, 223 transitions, 451 flow [2023-08-26 16:01:35,980 INFO L124 PetriNetUnfolderBase]: 47/313 cut-off events. [2023-08-26 16:01:35,980 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:01:35,984 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 16:01:35,990 INFO L119 LiptonReduction]: Number of co-enabled transitions 16320 [2023-08-26 16:01:39,316 INFO L134 LiptonReduction]: Checked pairs total: 30424 [2023-08-26 16:01:39,317 INFO L136 LiptonReduction]: Total number of compositions: 213 [2023-08-26 16:01:39,325 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 16:01:39,329 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;@4eff9c30, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:01:39,329 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 16:01:39,333 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:01:39,333 INFO L124 PetriNetUnfolderBase]: 12/57 cut-off events. [2023-08-26 16:01:39,333 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:01:39,333 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:39,334 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1] [2023-08-26 16:01:39,334 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:39,337 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:39,337 INFO L85 PathProgramCache]: Analyzing trace with hash 2135239003, now seen corresponding path program 1 times [2023-08-26 16:01:39,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:39,342 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963144865] [2023-08-26 16:01:39,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:39,343 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:39,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:39,496 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 16:01:39,496 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:39,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [963144865] [2023-08-26 16:01:39,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [963144865] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:01:39,497 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:01:39,497 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:01:39,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226699585] [2023-08-26 16:01:39,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:01:39,503 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:01:39,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:39,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:01:39,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:01:39,520 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 187 out of 441 [2023-08-26 16:01:39,525 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 16:01:39,526 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:39,526 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 187 of 441 [2023-08-26 16:01:39,526 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:39,707 INFO L124 PetriNetUnfolderBase]: 542/1246 cut-off events. [2023-08-26 16:01:39,707 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:01:39,708 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 16:01:39,710 INFO L140 encePairwiseOnDemand]: 409/441 looper letters, 27 selfloop transitions, 2 changer transitions 26/63 dead transitions. [2023-08-26 16:01:39,711 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 64 places, 63 transitions, 231 flow [2023-08-26 16:01:39,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:01:39,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:01:39,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 641 transitions. [2023-08-26 16:01:39,723 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48450491307634164 [2023-08-26 16:01:39,724 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 641 transitions. [2023-08-26 16:01:39,724 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 641 transitions. [2023-08-26 16:01:39,726 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:39,728 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 641 transitions. [2023-08-26 16:01:39,732 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 16:01:39,736 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 16:01:39,737 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 16:01:39,738 INFO L175 Difference]: Start difference. First operand has 69 places, 91 transitions, 187 flow. Second operand 3 states and 641 transitions. [2023-08-26 16:01:39,739 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 64 places, 63 transitions, 231 flow [2023-08-26 16:01:39,740 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 16:01:39,742 INFO L231 Difference]: Finished difference. Result has 65 places, 37 transitions, 89 flow [2023-08-26 16:01:39,743 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 16:01:39,745 INFO L281 CegarLoopForPetriNet]: 69 programPoint places, -4 predicate places. [2023-08-26 16:01:39,745 INFO L495 AbstractCegarLoop]: Abstraction has has 65 places, 37 transitions, 89 flow [2023-08-26 16:01:39,746 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 16:01:39,746 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:39,746 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2023-08-26 16:01:39,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 16:01:39,746 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:39,752 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:39,752 INFO L85 PathProgramCache]: Analyzing trace with hash 1456270241, now seen corresponding path program 1 times [2023-08-26 16:01:39,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:39,753 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082239892] [2023-08-26 16:01:39,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:39,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:39,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:39,814 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 16:01:39,815 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:39,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082239892] [2023-08-26 16:01:39,815 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1082239892] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:01:39,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21496635] [2023-08-26 16:01:39,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:39,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:39,815 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:39,817 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 16:01:39,864 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 16:01:39,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:39,921 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-26 16:01:39,924 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:01:39,973 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 16:01:39,973 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:01:39,984 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 16:01:39,984 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [21496635] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:01:39,985 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:01:39,985 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-26 16:01:39,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543368921] [2023-08-26 16:01:39,985 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:01:39,986 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 16:01:39,986 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:39,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 16:01:39,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-26 16:01:39,988 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 187 out of 441 [2023-08-26 16:01:39,990 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 16:01:39,990 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:39,990 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 187 of 441 [2023-08-26 16:01:39,990 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:40,051 INFO L124 PetriNetUnfolderBase]: 102/269 cut-off events. [2023-08-26 16:01:40,051 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:01:40,052 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 16:01:40,052 INFO L140 encePairwiseOnDemand]: 438/441 looper letters, 27 selfloop transitions, 5 changer transitions 0/40 dead transitions. [2023-08-26 16:01:40,052 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 40 transitions, 165 flow [2023-08-26 16:01:40,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 16:01:40,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 16:01:40,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1157 transitions. [2023-08-26 16:01:40,055 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43726379440665153 [2023-08-26 16:01:40,055 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1157 transitions. [2023-08-26 16:01:40,055 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1157 transitions. [2023-08-26 16:01:40,055 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:40,055 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1157 transitions. [2023-08-26 16:01:40,057 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 16:01:40,060 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 16:01:40,061 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 16:01:40,061 INFO L175 Difference]: Start difference. First operand has 65 places, 37 transitions, 89 flow. Second operand 6 states and 1157 transitions. [2023-08-26 16:01:40,062 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 40 transitions, 165 flow [2023-08-26 16:01:40,062 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 16:01:40,063 INFO L231 Difference]: Finished difference. Result has 47 places, 40 transitions, 121 flow [2023-08-26 16:01:40,063 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 16:01:40,064 INFO L281 CegarLoopForPetriNet]: 69 programPoint places, -22 predicate places. [2023-08-26 16:01:40,064 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 40 transitions, 121 flow [2023-08-26 16:01:40,064 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 16:01:40,065 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:40,065 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:40,070 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-08-26 16:01:40,269 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 16:01:40,270 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:40,270 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:40,270 INFO L85 PathProgramCache]: Analyzing trace with hash 71731931, now seen corresponding path program 2 times [2023-08-26 16:01:40,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:40,270 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059241864] [2023-08-26 16:01:40,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:40,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:40,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:40,335 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 16:01:40,335 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:40,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059241864] [2023-08-26 16:01:40,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2059241864] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:01:40,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743851680] [2023-08-26 16:01:40,336 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 16:01:40,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:40,336 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:40,341 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 16:01:40,378 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 16:01:40,413 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 16:01:40,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 16:01:40,414 INFO L262 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-26 16:01:40,415 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:01:40,429 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 16:01:40,429 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:01:40,464 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 16:01:40,464 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [743851680] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:01:40,464 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:01:40,465 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-26 16:01:40,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813461905] [2023-08-26 16:01:40,465 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:01:40,466 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-26 16:01:40,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:40,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-26 16:01:40,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-26 16:01:40,469 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 187 out of 441 [2023-08-26 16:01:40,471 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 16:01:40,471 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:40,471 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 187 of 441 [2023-08-26 16:01:40,472 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:40,562 INFO L124 PetriNetUnfolderBase]: 102/275 cut-off events. [2023-08-26 16:01:40,562 INFO L125 PetriNetUnfolderBase]: For 20/20 co-relation queries the response was YES. [2023-08-26 16:01:40,563 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 16:01:40,564 INFO L140 encePairwiseOnDemand]: 438/441 looper letters, 27 selfloop transitions, 11 changer transitions 0/46 dead transitions. [2023-08-26 16:01:40,564 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 46 transitions, 233 flow [2023-08-26 16:01:40,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-08-26 16:01:40,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-08-26 16:01:40,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 2288 transitions. [2023-08-26 16:01:40,568 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4323507180650038 [2023-08-26 16:01:40,568 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 2288 transitions. [2023-08-26 16:01:40,569 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 2288 transitions. [2023-08-26 16:01:40,570 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:40,570 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 2288 transitions. [2023-08-26 16:01:40,573 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 16:01:40,580 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 16:01:40,582 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 16:01:40,582 INFO L175 Difference]: Start difference. First operand has 47 places, 40 transitions, 121 flow. Second operand 12 states and 2288 transitions. [2023-08-26 16:01:40,582 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 46 transitions, 233 flow [2023-08-26 16:01:40,584 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 16:01:40,585 INFO L231 Difference]: Finished difference. Result has 63 places, 46 transitions, 191 flow [2023-08-26 16:01:40,585 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 16:01:40,586 INFO L281 CegarLoopForPetriNet]: 69 programPoint places, -6 predicate places. [2023-08-26 16:01:40,586 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 46 transitions, 191 flow [2023-08-26 16:01:40,588 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 16:01:40,588 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:40,588 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:40,599 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 16:01:40,793 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 16:01:40,793 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:40,794 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:40,794 INFO L85 PathProgramCache]: Analyzing trace with hash 1782494491, now seen corresponding path program 3 times [2023-08-26 16:01:40,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:40,794 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919662281] [2023-08-26 16:01:40,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:40,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:40,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:01:40,821 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 16:01:40,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:01:40,852 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 16:01:40,852 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 16:01:40,853 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 16:01:40,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 16:01:40,854 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-08-26 16:01:40,855 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-26 16:01:40,856 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 16:01:40,856 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 16:01:40,895 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 16:01:40,900 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 272 places, 315 transitions, 648 flow [2023-08-26 16:01:40,952 INFO L124 PetriNetUnfolderBase]: 80/522 cut-off events. [2023-08-26 16:01:40,953 INFO L125 PetriNetUnfolderBase]: For 6/8 co-relation queries the response was YES. [2023-08-26 16:01:40,956 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 16:01:40,956 INFO L82 GeneralOperation]: Start removeDead. Operand has 272 places, 315 transitions, 648 flow [2023-08-26 16:01:40,959 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 272 places, 315 transitions, 648 flow [2023-08-26 16:01:40,959 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:01:40,959 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 272 places, 315 transitions, 648 flow [2023-08-26 16:01:40,959 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 272 places, 315 transitions, 648 flow [2023-08-26 16:01:40,960 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 272 places, 315 transitions, 648 flow [2023-08-26 16:01:41,000 INFO L124 PetriNetUnfolderBase]: 80/522 cut-off events. [2023-08-26 16:01:41,001 INFO L125 PetriNetUnfolderBase]: For 6/8 co-relation queries the response was YES. [2023-08-26 16:01:41,005 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 16:01:41,021 INFO L119 LiptonReduction]: Number of co-enabled transitions 48960 [2023-08-26 16:01:44,565 INFO L134 LiptonReduction]: Checked pairs total: 97395 [2023-08-26 16:01:44,565 INFO L136 LiptonReduction]: Total number of compositions: 291 [2023-08-26 16:01:44,566 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 16:01:44,567 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;@4eff9c30, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:01:44,567 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 16:01:44,574 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:01:44,574 INFO L124 PetriNetUnfolderBase]: 41/158 cut-off events. [2023-08-26 16:01:44,574 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 16:01:44,574 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:44,574 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:44,575 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:44,575 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:44,575 INFO L85 PathProgramCache]: Analyzing trace with hash 441894105, now seen corresponding path program 1 times [2023-08-26 16:01:44,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:44,575 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1861498135] [2023-08-26 16:01:44,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:44,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:44,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:44,603 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 16:01:44,603 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:44,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1861498135] [2023-08-26 16:01:44,603 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1861498135] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:01:44,603 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:01:44,603 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:01:44,603 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409657469] [2023-08-26 16:01:44,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:01:44,604 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:01:44,604 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:44,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:01:44,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:01:44,605 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 258 out of 606 [2023-08-26 16:01:44,605 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 16:01:44,605 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:44,605 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 258 of 606 [2023-08-26 16:01:44,605 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:46,791 INFO L124 PetriNetUnfolderBase]: 22825/38051 cut-off events. [2023-08-26 16:01:46,791 INFO L125 PetriNetUnfolderBase]: For 132/132 co-relation queries the response was YES. [2023-08-26 16:01:46,834 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 16:01:46,873 INFO L140 encePairwiseOnDemand]: 562/606 looper letters, 47 selfloop transitions, 2 changer transitions 31/96 dead transitions. [2023-08-26 16:01:46,873 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 96 places, 96 transitions, 358 flow [2023-08-26 16:01:46,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:01:46,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:01:46,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 890 transitions. [2023-08-26 16:01:46,875 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48954895489548955 [2023-08-26 16:01:46,875 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 890 transitions. [2023-08-26 16:01:46,875 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 890 transitions. [2023-08-26 16:01:46,875 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:46,875 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 890 transitions. [2023-08-26 16:01:46,877 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 16:01:46,879 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 16:01:46,879 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 16:01:46,879 INFO L175 Difference]: Start difference. First operand has 102 places, 136 transitions, 290 flow. Second operand 3 states and 890 transitions. [2023-08-26 16:01:46,879 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 96 places, 96 transitions, 358 flow [2023-08-26 16:01:46,884 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 16:01:46,886 INFO L231 Difference]: Finished difference. Result has 97 places, 65 transitions, 152 flow [2023-08-26 16:01:46,886 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 16:01:46,887 INFO L281 CegarLoopForPetriNet]: 102 programPoint places, -5 predicate places. [2023-08-26 16:01:46,887 INFO L495 AbstractCegarLoop]: Abstraction has has 97 places, 65 transitions, 152 flow [2023-08-26 16:01:46,887 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 16:01:46,887 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:46,887 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 16:01:46,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 16:01:46,888 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:46,888 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:46,888 INFO L85 PathProgramCache]: Analyzing trace with hash 1565852261, now seen corresponding path program 1 times [2023-08-26 16:01:46,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:46,888 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369061356] [2023-08-26 16:01:46,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:46,888 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:46,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:46,941 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 16:01:46,941 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:46,943 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369061356] [2023-08-26 16:01:46,943 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369061356] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:01:46,944 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729259645] [2023-08-26 16:01:46,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:46,944 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:46,944 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:46,945 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 16:01:46,948 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 16:01:47,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:47,013 INFO L262 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-26 16:01:47,013 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:01:47,020 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 16:01:47,020 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:01:47,029 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 16:01:47,030 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1729259645] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:01:47,030 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:01:47,030 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-26 16:01:47,030 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311678031] [2023-08-26 16:01:47,030 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:01:47,030 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 16:01:47,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:47,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 16:01:47,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-26 16:01:47,032 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 258 out of 606 [2023-08-26 16:01:47,033 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 16:01:47,033 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:47,033 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 258 of 606 [2023-08-26 16:01:47,033 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:47,497 INFO L124 PetriNetUnfolderBase]: 4492/7777 cut-off events. [2023-08-26 16:01:47,498 INFO L125 PetriNetUnfolderBase]: For 66/66 co-relation queries the response was YES. [2023-08-26 16:01:47,506 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 16:01:47,518 INFO L140 encePairwiseOnDemand]: 603/606 looper letters, 47 selfloop transitions, 5 changer transitions 0/68 dead transitions. [2023-08-26 16:01:47,518 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 68 transitions, 268 flow [2023-08-26 16:01:47,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 16:01:47,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 16:01:47,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1603 transitions. [2023-08-26 16:01:47,521 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44086908690869087 [2023-08-26 16:01:47,521 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1603 transitions. [2023-08-26 16:01:47,521 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1603 transitions. [2023-08-26 16:01:47,522 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:47,522 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1603 transitions. [2023-08-26 16:01:47,524 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 16:01:47,527 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 16:01:47,528 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 16:01:47,528 INFO L175 Difference]: Start difference. First operand has 97 places, 65 transitions, 152 flow. Second operand 6 states and 1603 transitions. [2023-08-26 16:01:47,528 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 68 transitions, 268 flow [2023-08-26 16:01:47,529 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 16:01:47,529 INFO L231 Difference]: Finished difference. Result has 76 places, 68 transitions, 182 flow [2023-08-26 16:01:47,529 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 16:01:47,530 INFO L281 CegarLoopForPetriNet]: 102 programPoint places, -26 predicate places. [2023-08-26 16:01:47,530 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 68 transitions, 182 flow [2023-08-26 16:01:47,531 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 16:01:47,531 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:47,531 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:47,537 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-08-26 16:01:47,734 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 16:01:47,735 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:47,735 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:47,735 INFO L85 PathProgramCache]: Analyzing trace with hash 113231833, now seen corresponding path program 2 times [2023-08-26 16:01:47,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:47,735 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482773778] [2023-08-26 16:01:47,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:47,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:47,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:47,809 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 16:01:47,810 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:47,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482773778] [2023-08-26 16:01:47,810 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1482773778] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:01:47,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2022457591] [2023-08-26 16:01:47,810 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 16:01:47,810 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:01:47,810 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:01:47,817 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 16:01:47,832 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 16:01:47,885 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 16:01:47,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 16:01:47,887 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-26 16:01:47,888 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:01:47,901 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 16:01:47,901 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:01:47,941 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 16:01:47,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2022457591] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:01:47,941 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:01:47,941 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-26 16:01:47,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823694304] [2023-08-26 16:01:47,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:01:47,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-26 16:01:47,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:47,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-26 16:01:47,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-26 16:01:47,944 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 258 out of 606 [2023-08-26 16:01:47,947 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 16:01:47,947 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:47,947 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 258 of 606 [2023-08-26 16:01:47,947 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:01:48,427 INFO L124 PetriNetUnfolderBase]: 4492/7783 cut-off events. [2023-08-26 16:01:48,427 INFO L125 PetriNetUnfolderBase]: For 78/78 co-relation queries the response was YES. [2023-08-26 16:01:48,434 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 16:01:48,444 INFO L140 encePairwiseOnDemand]: 603/606 looper letters, 47 selfloop transitions, 11 changer transitions 0/74 dead transitions. [2023-08-26 16:01:48,445 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 87 places, 74 transitions, 334 flow [2023-08-26 16:01:48,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-08-26 16:01:48,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-08-26 16:01:48,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 3160 transitions. [2023-08-26 16:01:48,451 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43454345434543457 [2023-08-26 16:01:48,451 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 3160 transitions. [2023-08-26 16:01:48,451 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 3160 transitions. [2023-08-26 16:01:48,452 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:01:48,452 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 3160 transitions. [2023-08-26 16:01:48,456 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 16:01:48,463 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 16:01:48,464 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 16:01:48,464 INFO L175 Difference]: Start difference. First operand has 76 places, 68 transitions, 182 flow. Second operand 12 states and 3160 transitions. [2023-08-26 16:01:48,464 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 87 places, 74 transitions, 334 flow [2023-08-26 16:01:48,465 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 16:01:48,466 INFO L231 Difference]: Finished difference. Result has 92 places, 74 transitions, 252 flow [2023-08-26 16:01:48,466 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 16:01:48,466 INFO L281 CegarLoopForPetriNet]: 102 programPoint places, -10 predicate places. [2023-08-26 16:01:48,466 INFO L495 AbstractCegarLoop]: Abstraction has has 92 places, 74 transitions, 252 flow [2023-08-26 16:01:48,467 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 16:01:48,467 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:48,467 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 3, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 16:01:48,471 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-08-26 16:01:48,671 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 16:01:48,671 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:48,672 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:48,672 INFO L85 PathProgramCache]: Analyzing trace with hash -592610215, now seen corresponding path program 3 times [2023-08-26 16:01:48,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:48,672 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323557912] [2023-08-26 16:01:48,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:48,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:48,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:01:48,707 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 16:01:48,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:01:48,731 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 16:01:48,732 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 16:01:48,732 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 16:01:48,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 16:01:48,732 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-08-26 16:01:48,732 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-26 16:01:48,733 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 16:01:48,733 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 16:01:48,765 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 16:01:48,768 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 346 places, 402 transitions, 834 flow [2023-08-26 16:01:48,851 INFO L124 PetriNetUnfolderBase]: 117/763 cut-off events. [2023-08-26 16:01:48,851 INFO L125 PetriNetUnfolderBase]: For 19/22 co-relation queries the response was YES. [2023-08-26 16:01:48,860 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 16:01:48,860 INFO L82 GeneralOperation]: Start removeDead. Operand has 346 places, 402 transitions, 834 flow [2023-08-26 16:01:48,867 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 346 places, 402 transitions, 834 flow [2023-08-26 16:01:48,867 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:01:48,867 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 346 places, 402 transitions, 834 flow [2023-08-26 16:01:48,867 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 346 places, 402 transitions, 834 flow [2023-08-26 16:01:48,867 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 346 places, 402 transitions, 834 flow [2023-08-26 16:01:48,950 INFO L124 PetriNetUnfolderBase]: 117/763 cut-off events. [2023-08-26 16:01:48,950 INFO L125 PetriNetUnfolderBase]: For 19/22 co-relation queries the response was YES. [2023-08-26 16:01:48,960 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 16:01:48,987 INFO L119 LiptonReduction]: Number of co-enabled transitions 95880 [2023-08-26 16:01:53,649 INFO L134 LiptonReduction]: Checked pairs total: 192639 [2023-08-26 16:01:53,650 INFO L136 LiptonReduction]: Total number of compositions: 376 [2023-08-26 16:01:53,651 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 16:01:53,651 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;@4eff9c30, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:01:53,651 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 16:01:53,662 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:01:53,663 INFO L124 PetriNetUnfolderBase]: 62/244 cut-off events. [2023-08-26 16:01:53,663 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 16:01:53,663 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:01:53,663 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-08-26 16:01:53,663 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:01:53,663 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:01:53,663 INFO L85 PathProgramCache]: Analyzing trace with hash 497599104, now seen corresponding path program 1 times [2023-08-26 16:01:53,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:01:53,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608649928] [2023-08-26 16:01:53,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:01:53,664 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:01:53,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:01:53,684 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 16:01:53,684 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:01:53,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608649928] [2023-08-26 16:01:53,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608649928] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:01:53,684 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:01:53,685 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:01:53,685 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770374657] [2023-08-26 16:01:53,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:01:53,685 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:01:53,685 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:01:53,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:01:53,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:01:53,686 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 329 out of 778 [2023-08-26 16:01:53,687 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 16:01:53,687 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:01:53,687 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 329 of 778 [2023-08-26 16:01:53,687 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:02:57,048 INFO L124 PetriNetUnfolderBase]: 758121/1080698 cut-off events. [2023-08-26 16:02:57,048 INFO L125 PetriNetUnfolderBase]: For 5917/5917 co-relation queries the response was YES. [2023-08-26 16:02:58,913 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 16:02:59,739 INFO L140 encePairwiseOnDemand]: 723/778 looper letters, 69 selfloop transitions, 2 changer transitions 32/124 dead transitions. [2023-08-26 16:02:59,739 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 124 places, 124 transitions, 472 flow [2023-08-26 16:02:59,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:02:59,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:02:59,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1137 transitions. [2023-08-26 16:02:59,742 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.487146529562982 [2023-08-26 16:02:59,742 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1137 transitions. [2023-08-26 16:02:59,742 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1137 transitions. [2023-08-26 16:02:59,743 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:02:59,743 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1137 transitions. [2023-08-26 16:02:59,745 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 16:02:59,747 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 16:02:59,757 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 16:02:59,757 INFO L175 Difference]: Start difference. First operand has 132 places, 175 transitions, 380 flow. Second operand 3 states and 1137 transitions. [2023-08-26 16:02:59,757 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 124 places, 124 transitions, 472 flow [2023-08-26 16:02:59,760 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 16:02:59,762 INFO L231 Difference]: Finished difference. Result has 125 places, 92 transitions, 215 flow [2023-08-26 16:02:59,762 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 16:02:59,763 INFO L281 CegarLoopForPetriNet]: 132 programPoint places, -7 predicate places. [2023-08-26 16:02:59,763 INFO L495 AbstractCegarLoop]: Abstraction has has 125 places, 92 transitions, 215 flow [2023-08-26 16:02:59,764 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 16:02:59,764 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:02:59,764 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:02:59,764 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 16:02:59,764 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:02:59,765 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:02:59,765 INFO L85 PathProgramCache]: Analyzing trace with hash -1553503490, now seen corresponding path program 1 times [2023-08-26 16:02:59,765 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:02:59,765 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443373260] [2023-08-26 16:02:59,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:02:59,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:02:59,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:02:59,808 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 16:02:59,808 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:02:59,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443373260] [2023-08-26 16:02:59,808 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443373260] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:02:59,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [616824696] [2023-08-26 16:02:59,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:02:59,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:02:59,809 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:02:59,811 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 16:02:59,812 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 16:02:59,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:02:59,894 INFO L262 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-26 16:02:59,895 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:02:59,900 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 16:02:59,900 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:02:59,909 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 16:02:59,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [616824696] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:02:59,909 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:02:59,909 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-26 16:02:59,910 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259571435] [2023-08-26 16:02:59,910 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:02:59,910 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 16:02:59,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:02:59,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 16:02:59,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-26 16:02:59,911 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 329 out of 778 [2023-08-26 16:02:59,912 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 16:02:59,912 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:02:59,912 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 329 of 778 [2023-08-26 16:02:59,913 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:03:11,813 INFO L124 PetriNetUnfolderBase]: 152906/220679 cut-off events. [2023-08-26 16:03:11,814 INFO L125 PetriNetUnfolderBase]: For 3043/3043 co-relation queries the response was YES. [2023-08-26 16:03:12,192 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 16:03:12,528 INFO L140 encePairwiseOnDemand]: 775/778 looper letters, 69 selfloop transitions, 5 changer transitions 0/95 dead transitions. [2023-08-26 16:03:12,529 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 102 places, 95 transitions, 375 flow [2023-08-26 16:03:12,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 16:03:12,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 16:03:12,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 2051 transitions. [2023-08-26 16:03:12,536 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4393744644387318 [2023-08-26 16:03:12,536 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 2051 transitions. [2023-08-26 16:03:12,536 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 2051 transitions. [2023-08-26 16:03:12,538 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:03:12,538 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 2051 transitions. [2023-08-26 16:03:12,542 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 16:03:12,547 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 16:03:12,548 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 16:03:12,548 INFO L175 Difference]: Start difference. First operand has 125 places, 92 transitions, 215 flow. Second operand 6 states and 2051 transitions. [2023-08-26 16:03:12,548 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 102 places, 95 transitions, 375 flow [2023-08-26 16:03:12,550 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 16:03:12,551 INFO L231 Difference]: Finished difference. Result has 104 places, 95 transitions, 241 flow [2023-08-26 16:03:12,551 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 16:03:12,553 INFO L281 CegarLoopForPetriNet]: 132 programPoint places, -28 predicate places. [2023-08-26 16:03:12,553 INFO L495 AbstractCegarLoop]: Abstraction has has 104 places, 95 transitions, 241 flow [2023-08-26 16:03:12,554 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 16:03:12,554 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:03:12,554 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-08-26 16:03:12,565 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 16:03:12,758 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 16:03:12,759 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:03:12,759 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:03:12,759 INFO L85 PathProgramCache]: Analyzing trace with hash -330436096, now seen corresponding path program 2 times [2023-08-26 16:03:12,759 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:03:12,759 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259657462] [2023-08-26 16:03:12,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:03:12,759 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:03:12,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:03:12,818 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 16:03:12,818 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:03:12,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259657462] [2023-08-26 16:03:12,818 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259657462] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:03:12,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013578441] [2023-08-26 16:03:12,819 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 16:03:12,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:03:12,819 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:03:12,820 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 16:03:13,041 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 16:03:13,117 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 16:03:13,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 16:03:13,118 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-26 16:03:13,119 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:03:13,138 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 16:03:13,138 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:03:13,180 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 16:03:13,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2013578441] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:03:13,181 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:03:13,181 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-26 16:03:13,181 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749356975] [2023-08-26 16:03:13,181 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:03:13,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-26 16:03:13,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:03:13,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-26 16:03:13,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-26 16:03:13,183 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 329 out of 778 [2023-08-26 16:03:13,185 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 16:03:13,185 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:03:13,185 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 329 of 778 [2023-08-26 16:03:13,185 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:03:25,755 INFO L124 PetriNetUnfolderBase]: 152906/220685 cut-off events. [2023-08-26 16:03:25,755 INFO L125 PetriNetUnfolderBase]: For 1318/1318 co-relation queries the response was YES. [2023-08-26 16:03:26,277 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 16:03:26,612 INFO L140 encePairwiseOnDemand]: 775/778 looper letters, 69 selfloop transitions, 11 changer transitions 0/101 dead transitions. [2023-08-26 16:03:26,612 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 115 places, 101 transitions, 437 flow [2023-08-26 16:03:26,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-08-26 16:03:26,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-08-26 16:03:26,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 4034 transitions. [2023-08-26 16:03:26,619 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43209083119108826 [2023-08-26 16:03:26,619 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 4034 transitions. [2023-08-26 16:03:26,619 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 4034 transitions. [2023-08-26 16:03:26,621 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:03:26,621 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 4034 transitions. [2023-08-26 16:03:26,626 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 16:03:26,633 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 16:03:26,634 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 16:03:26,634 INFO L175 Difference]: Start difference. First operand has 104 places, 95 transitions, 241 flow. Second operand 12 states and 4034 transitions. [2023-08-26 16:03:26,634 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 115 places, 101 transitions, 437 flow [2023-08-26 16:03:26,635 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 16:03:26,636 INFO L231 Difference]: Finished difference. Result has 120 places, 101 transitions, 311 flow [2023-08-26 16:03:26,637 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 16:03:26,637 INFO L281 CegarLoopForPetriNet]: 132 programPoint places, -12 predicate places. [2023-08-26 16:03:26,637 INFO L495 AbstractCegarLoop]: Abstraction has has 120 places, 101 transitions, 311 flow [2023-08-26 16:03:26,638 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 16:03:26,638 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:03:26,638 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-08-26 16:03:26,645 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-08-26 16:03:26,842 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 16:03:26,843 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:03:26,843 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:03:26,843 INFO L85 PathProgramCache]: Analyzing trace with hash -965168832, now seen corresponding path program 3 times [2023-08-26 16:03:26,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:03:26,843 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088189596] [2023-08-26 16:03:26,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:03:26,843 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:03:26,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:03:26,876 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 16:03:26,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 16:03:26,902 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 16:03:26,903 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 16:03:26,903 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 16:03:26,903 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 16:03:26,903 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-08-26 16:03:26,904 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-26 16:03:26,904 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 16:03:26,904 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 16:03:26,934 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 16:03:26,937 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 420 places, 489 transitions, 1022 flow [2023-08-26 16:03:27,054 INFO L124 PetriNetUnfolderBase]: 166/1080 cut-off events. [2023-08-26 16:03:27,054 INFO L125 PetriNetUnfolderBase]: For 48/52 co-relation queries the response was YES. [2023-08-26 16:03:27,072 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 16:03:27,072 INFO L82 GeneralOperation]: Start removeDead. Operand has 420 places, 489 transitions, 1022 flow [2023-08-26 16:03:27,078 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 420 places, 489 transitions, 1022 flow [2023-08-26 16:03:27,078 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:03:27,078 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 420 places, 489 transitions, 1022 flow [2023-08-26 16:03:27,079 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 420 places, 489 transitions, 1022 flow [2023-08-26 16:03:27,079 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 420 places, 489 transitions, 1022 flow [2023-08-26 16:03:27,355 INFO L124 PetriNetUnfolderBase]: 166/1080 cut-off events. [2023-08-26 16:03:27,355 INFO L125 PetriNetUnfolderBase]: For 48/52 co-relation queries the response was YES. [2023-08-26 16:03:27,366 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 16:03:27,401 INFO L119 LiptonReduction]: Number of co-enabled transitions 157760 [2023-08-26 16:03:32,466 INFO L134 LiptonReduction]: Checked pairs total: 355376 [2023-08-26 16:03:32,466 INFO L136 LiptonReduction]: Total number of compositions: 457 [2023-08-26 16:03:32,467 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 16:03:32,467 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;@4eff9c30, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:03:32,467 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 16:03:32,486 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:03:32,486 INFO L124 PetriNetUnfolderBase]: 87/348 cut-off events. [2023-08-26 16:03:32,486 INFO L125 PetriNetUnfolderBase]: For 23/23 co-relation queries the response was YES. [2023-08-26 16:03:32,486 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:03:32,486 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:03:32,486 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 16:03:32,486 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:03:32,486 INFO L85 PathProgramCache]: Analyzing trace with hash 126057815, now seen corresponding path program 1 times [2023-08-26 16:03:32,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:03:32,486 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [635203782] [2023-08-26 16:03:32,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:03:32,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:03:32,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:03:32,508 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 16:03:32,508 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:03:32,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [635203782] [2023-08-26 16:03:32,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [635203782] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:03:32,508 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:03:32,508 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:03:32,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437337629] [2023-08-26 16:03:32,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:03:32,508 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:03:32,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:03:32,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:03:32,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:03:32,510 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 400 out of 946 [2023-08-26 16:03:32,510 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 16:03:32,510 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:03:32,510 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 400 of 946 [2023-08-26 16:03:32,511 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand