/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/pthread-complex/safestack_relacy.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 15:26:42,929 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 15:26:43,010 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 15:26:43,017 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 15:26:43,018 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 15:26:43,048 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 15:26:43,049 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 15:26:43,049 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 15:26:43,050 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 15:26:43,053 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 15:26:43,053 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 15:26:43,053 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 15:26:43,054 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 15:26:43,055 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 15:26:43,055 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 15:26:43,055 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 15:26:43,055 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 15:26:43,056 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 15:26:43,056 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 15:26:43,056 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 15:26:43,056 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 15:26:43,056 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 15:26:43,057 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 15:26:43,057 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 15:26:43,057 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 15:26:43,058 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 15:26:43,058 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 15:26:43,058 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 15:26:43,058 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 15:26:43,058 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 15:26:43,059 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 15:26:43,060 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 15:26:43,060 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 15:26:43,060 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 15:26:43,060 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 15:26:43,060 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> INSUFFICIENT_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 15:26:43,365 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 15:26:43,383 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 15:26:43,386 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 15:26:43,386 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 15:26:43,388 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 15:26:43,390 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread-complex/safestack_relacy.i [2023-08-26 15:26:44,581 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 15:26:44,953 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 15:26:44,954 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread-complex/safestack_relacy.i [2023-08-26 15:26:44,977 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/96794e8c8/1916aea3b773477e8e1a7c0b4dca7e03/FLAG7e8a3b552 [2023-08-26 15:26:44,992 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/96794e8c8/1916aea3b773477e8e1a7c0b4dca7e03 [2023-08-26 15:26:44,997 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 15:26:44,998 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 15:26:45,001 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 15:26:45,001 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 15:26:45,004 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 15:26:45,004 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 03:26:44" (1/1) ... [2023-08-26 15:26:45,005 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@598d0067 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45, skipping insertion in model container [2023-08-26 15:26:45,005 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 03:26:44" (1/1) ... [2023-08-26 15:26:45,073 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 15:26:45,588 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 15:26:45,598 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 15:26:45,609 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: unsigned short [127] [2023-08-26 15:26:45,619 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [573] [2023-08-26 15:26:45,620 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [574] [2023-08-26 15:26:45,666 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 15:26:45,756 WARN L669 CHandler]: The function __VERIFIER_atomic_begin is called, but not defined or handled by StandardFunctionHandler. [2023-08-26 15:26:45,756 WARN L669 CHandler]: The function __VERIFIER_atomic_end is called, but not defined or handled by StandardFunctionHandler. [2023-08-26 15:26:45,763 INFO L206 MainTranslator]: Completed translation [2023-08-26 15:26:45,764 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45 WrapperNode [2023-08-26 15:26:45,764 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 15:26:45,765 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 15:26:45,765 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 15:26:45,765 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 15:26:45,770 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45" (1/1) ... [2023-08-26 15:26:45,794 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45" (1/1) ... [2023-08-26 15:26:45,823 INFO L138 Inliner]: procedures = 481, calls = 75, calls flagged for inlining = 20, calls inlined = 20, statements flattened = 289 [2023-08-26 15:26:45,824 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 15:26:45,825 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 15:26:45,825 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 15:26:45,825 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 15:26:45,832 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45" (1/1) ... [2023-08-26 15:26:45,832 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45" (1/1) ... [2023-08-26 15:26:45,838 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45" (1/1) ... [2023-08-26 15:26:45,838 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45" (1/1) ... [2023-08-26 15:26:45,851 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45" (1/1) ... [2023-08-26 15:26:45,855 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45" (1/1) ... [2023-08-26 15:26:45,859 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45" (1/1) ... [2023-08-26 15:26:45,861 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45" (1/1) ... [2023-08-26 15:26:45,866 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 15:26:45,867 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 15:26:45,867 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 15:26:45,867 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 15:26:45,868 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45" (1/1) ... [2023-08-26 15:26:45,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 15:26:45,887 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 15:26:45,899 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 15:26:45,934 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 15:26:45,951 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2023-08-26 15:26:45,951 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 15:26:45,951 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2023-08-26 15:26:45,951 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 15:26:45,952 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 15:26:45,952 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2023-08-26 15:26:45,952 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2023-08-26 15:26:45,952 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 15:26:45,952 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 15:26:45,952 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 15:26:45,953 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 15:26:45,953 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 15:26:45,954 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 15:26:46,211 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 15:26:46,213 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 15:26:46,578 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 15:26:46,757 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 15:26:46,758 INFO L302 CfgBuilder]: Removed 7 assume(true) statements. [2023-08-26 15:26:46,761 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 03:26:46 BoogieIcfgContainer [2023-08-26 15:26:46,761 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 15:26:46,763 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 15:26:46,763 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 15:26:46,766 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 15:26:46,766 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 03:26:44" (1/3) ... [2023-08-26 15:26:46,767 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ab91c39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 03:26:46, skipping insertion in model container [2023-08-26 15:26:46,767 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:26:45" (2/3) ... [2023-08-26 15:26:46,768 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ab91c39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 03:26:46, skipping insertion in model container [2023-08-26 15:26:46,768 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 03:26:46" (3/3) ... [2023-08-26 15:26:46,769 INFO L112 eAbstractionObserver]: Analyzing ICFG safestack_relacy.i [2023-08-26 15:26:46,784 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 15:26:46,784 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 67 error locations. [2023-08-26 15:26:46,785 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 15:26:46,932 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 15:26:46,976 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 306 places, 321 transitions, 650 flow [2023-08-26 15:26:47,115 INFO L124 PetriNetUnfolderBase]: 20/339 cut-off events. [2023-08-26 15:26:47,116 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 15:26:47,125 INFO L83 FinitePrefix]: Finished finitePrefix Result has 345 conditions, 339 events. 20/339 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 821 event pairs, 0 based on Foata normal form. 0/245 useless extension candidates. Maximal degree in co-relation 247. Up to 4 conditions per place. [2023-08-26 15:26:47,125 INFO L82 GeneralOperation]: Start removeDead. Operand has 306 places, 321 transitions, 650 flow [2023-08-26 15:26:47,135 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 294 places, 308 transitions, 621 flow [2023-08-26 15:26:47,138 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 15:26:47,156 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 294 places, 308 transitions, 621 flow [2023-08-26 15:26:47,160 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 294 places, 308 transitions, 621 flow [2023-08-26 15:26:47,160 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 294 places, 308 transitions, 621 flow [2023-08-26 15:26:47,226 INFO L124 PetriNetUnfolderBase]: 19/326 cut-off events. [2023-08-26 15:26:47,227 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 15:26:47,228 INFO L83 FinitePrefix]: Finished finitePrefix Result has 331 conditions, 326 events. 19/326 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 744 event pairs, 0 based on Foata normal form. 0/240 useless extension candidates. Maximal degree in co-relation 247. Up to 4 conditions per place. [2023-08-26 15:26:47,233 INFO L119 LiptonReduction]: Number of co-enabled transitions 10752 [2023-08-26 15:27:00,182 INFO L134 LiptonReduction]: Checked pairs total: 16756 [2023-08-26 15:27:00,183 INFO L136 LiptonReduction]: Total number of compositions: 410 [2023-08-26 15:27:00,201 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 15:27:00,208 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;@15279d69, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 15:27:00,208 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 15:27:00,213 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 15:27:00,214 INFO L124 PetriNetUnfolderBase]: 1/22 cut-off events. [2023-08-26 15:27:00,214 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 15:27:00,214 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 15:27:00,214 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1] [2023-08-26 15:27:00,215 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 15:27:00,219 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 15:27:00,219 INFO L85 PathProgramCache]: Analyzing trace with hash 1917254530, now seen corresponding path program 1 times [2023-08-26 15:27:00,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 15:27:00,227 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131518329] [2023-08-26 15:27:00,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 15:27:00,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 15:27:00,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 15:27:00,690 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 15:27:00,690 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 15:27:00,690 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131518329] [2023-08-26 15:27:00,691 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131518329] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 15:27:00,691 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 15:27:00,691 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 15:27:00,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720950829] [2023-08-26 15:27:00,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 15:27:00,699 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 15:27:00,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 15:27:00,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 15:27:00,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 15:27:00,733 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 263 out of 731 [2023-08-26 15:27:00,740 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 94 places, 101 transitions, 207 flow. Second operand has 3 states, 3 states have (on average 264.6666666666667) internal successors, (794), 3 states have internal predecessors, (794), 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 15:27:00,740 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 15:27:00,740 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 263 of 731 [2023-08-26 15:27:00,741 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 15:27:00,971 INFO L124 PetriNetUnfolderBase]: 364/782 cut-off events. [2023-08-26 15:27:00,971 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 15:27:00,973 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1529 conditions, 782 events. 364/782 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 75. Compared 3929 event pairs, 315 based on Foata normal form. 8/298 useless extension candidates. Maximal degree in co-relation 1500. Up to 741 conditions per place. [2023-08-26 15:27:00,977 INFO L140 encePairwiseOnDemand]: 696/731 looper letters, 56 selfloop transitions, 2 changer transitions 5/69 dead transitions. [2023-08-26 15:27:00,977 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 66 places, 69 transitions, 269 flow [2023-08-26 15:27:00,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 15:27:00,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 15:27:00,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 885 transitions. [2023-08-26 15:27:00,996 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.40355677154582764 [2023-08-26 15:27:00,997 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 885 transitions. [2023-08-26 15:27:00,998 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 885 transitions. [2023-08-26 15:27:01,002 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 15:27:01,004 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 885 transitions. [2023-08-26 15:27:01,011 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 295.0) internal successors, (885), 3 states have internal predecessors, (885), 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 15:27:01,019 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 731.0) internal successors, (2924), 4 states have internal predecessors, (2924), 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 15:27:01,021 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 731.0) internal successors, (2924), 4 states have internal predecessors, (2924), 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 15:27:01,023 INFO L175 Difference]: Start difference. First operand has 94 places, 101 transitions, 207 flow. Second operand 3 states and 885 transitions. [2023-08-26 15:27:01,023 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 66 places, 69 transitions, 269 flow [2023-08-26 15:27:01,026 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 66 places, 69 transitions, 269 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 15:27:01,028 INFO L231 Difference]: Finished difference. Result has 67 places, 64 transitions, 143 flow [2023-08-26 15:27:01,030 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=731, PETRI_DIFFERENCE_MINUEND_FLOW=141, PETRI_DIFFERENCE_MINUEND_PLACES=64, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=68, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=66, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=143, PETRI_PLACES=67, PETRI_TRANSITIONS=64} [2023-08-26 15:27:01,033 INFO L281 CegarLoopForPetriNet]: 94 programPoint places, -27 predicate places. [2023-08-26 15:27:01,034 INFO L495 AbstractCegarLoop]: Abstraction has has 67 places, 64 transitions, 143 flow [2023-08-26 15:27:01,034 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 264.6666666666667) internal successors, (794), 3 states have internal predecessors, (794), 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 15:27:01,035 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 15:27:01,035 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2023-08-26 15:27:01,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 15:27:01,035 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 15:27:01,042 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 15:27:01,043 INFO L85 PathProgramCache]: Analyzing trace with hash -1498291834, now seen corresponding path program 1 times [2023-08-26 15:27:01,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 15:27:01,043 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782791520] [2023-08-26 15:27:01,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 15:27:01,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 15:27:01,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 15:27:01,211 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 15:27:01,211 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 15:27:01,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782791520] [2023-08-26 15:27:01,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782791520] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 15:27:01,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1167213942] [2023-08-26 15:27:01,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 15:27:01,212 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 15:27:01,212 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 15:27:01,217 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 15:27:01,242 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 15:27:01,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 15:27:01,348 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 5 conjunts are in the unsatisfiable core [2023-08-26 15:27:01,352 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 15:27:01,400 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 15:27:01,400 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 15:27:01,417 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 15:27:01,418 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1167213942] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 15:27:01,418 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 15:27:01,418 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-26 15:27:01,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700308677] [2023-08-26 15:27:01,419 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 15:27:01,419 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 15:27:01,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 15:27:01,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 15:27:01,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2023-08-26 15:27:01,422 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 263 out of 731 [2023-08-26 15:27:01,424 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 67 places, 64 transitions, 143 flow. Second operand has 7 states, 7 states have (on average 264.57142857142856) internal successors, (1852), 7 states have internal predecessors, (1852), 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 15:27:01,424 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 15:27:01,424 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 263 of 731 [2023-08-26 15:27:01,425 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 15:27:01,580 INFO L124 PetriNetUnfolderBase]: 109/268 cut-off events. [2023-08-26 15:27:01,580 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 15:27:01,580 INFO L83 FinitePrefix]: Finished finitePrefix Result has 534 conditions, 268 events. 109/268 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 25. Compared 1019 event pairs, 90 based on Foata normal form. 0/171 useless extension candidates. Maximal degree in co-relation 522. Up to 251 conditions per place. [2023-08-26 15:27:01,581 INFO L140 encePairwiseOnDemand]: 728/731 looper letters, 56 selfloop transitions, 3 changer transitions 0/65 dead transitions. [2023-08-26 15:27:01,581 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 65 transitions, 265 flow [2023-08-26 15:27:01,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 15:27:01,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 15:27:01,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 1112 transitions. [2023-08-26 15:27:01,585 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3803009575923393 [2023-08-26 15:27:01,586 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 1112 transitions. [2023-08-26 15:27:01,586 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 1112 transitions. [2023-08-26 15:27:01,586 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 15:27:01,586 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 1112 transitions. [2023-08-26 15:27:01,589 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 278.0) internal successors, (1112), 4 states have internal predecessors, (1112), 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 15:27:01,594 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 731.0) internal successors, (3655), 5 states have internal predecessors, (3655), 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 15:27:01,596 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 731.0) internal successors, (3655), 5 states have internal predecessors, (3655), 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 15:27:01,596 INFO L175 Difference]: Start difference. First operand has 67 places, 64 transitions, 143 flow. Second operand 4 states and 1112 transitions. [2023-08-26 15:27:01,596 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 65 transitions, 265 flow [2023-08-26 15:27:01,597 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 64 places, 65 transitions, 261 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-26 15:27:01,599 INFO L231 Difference]: Finished difference. Result has 65 places, 65 transitions, 155 flow [2023-08-26 15:27:01,599 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=731, PETRI_DIFFERENCE_MINUEND_FLOW=139, PETRI_DIFFERENCE_MINUEND_PLACES=61, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=64, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=61, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=155, PETRI_PLACES=65, PETRI_TRANSITIONS=65} [2023-08-26 15:27:01,600 INFO L281 CegarLoopForPetriNet]: 94 programPoint places, -29 predicate places. [2023-08-26 15:27:01,600 INFO L495 AbstractCegarLoop]: Abstraction has has 65 places, 65 transitions, 155 flow [2023-08-26 15:27:01,601 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 264.57142857142856) internal successors, (1852), 7 states have internal predecessors, (1852), 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 15:27:01,601 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 15:27:01,601 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2023-08-26 15:27:01,617 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-08-26 15:27:01,808 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 15:27:01,808 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 15:27:01,809 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 15:27:01,809 INFO L85 PathProgramCache]: Analyzing trace with hash -6046718, now seen corresponding path program 2 times [2023-08-26 15:27:01,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 15:27:01,809 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211600978] [2023-08-26 15:27:01,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 15:27:01,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 15:27:01,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 15:27:01,846 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 15:27:01,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 15:27:01,908 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 15:27:01,909 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 15:27:01,909 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 15:27:01,911 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-08-26 15:27:01,911 INFO L445 BasicCegarLoop]: Path program histogram: [2, 1] [2023-08-26 15:27:01,913 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-26 15:27:01,914 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 15:27:01,914 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 15:27:02,010 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 15:27:02,014 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 520 places, 547 transitions, 1112 flow [2023-08-26 15:27:02,129 INFO L124 PetriNetUnfolderBase]: 38/607 cut-off events. [2023-08-26 15:27:02,129 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 15:27:02,141 INFO L83 FinitePrefix]: Finished finitePrefix Result has 621 conditions, 607 events. 38/607 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 2432 event pairs, 0 based on Foata normal form. 0/433 useless extension candidates. Maximal degree in co-relation 486. Up to 8 conditions per place. [2023-08-26 15:27:02,141 INFO L82 GeneralOperation]: Start removeDead. Operand has 520 places, 547 transitions, 1112 flow [2023-08-26 15:27:02,146 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 512 places, 539 transitions, 1096 flow [2023-08-26 15:27:02,146 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 15:27:02,147 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 512 places, 539 transitions, 1096 flow [2023-08-26 15:27:02,147 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 512 places, 539 transitions, 1096 flow [2023-08-26 15:27:02,147 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 512 places, 539 transitions, 1096 flow [2023-08-26 15:27:02,270 INFO L124 PetriNetUnfolderBase]: 38/599 cut-off events. [2023-08-26 15:27:02,270 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 15:27:02,281 INFO L83 FinitePrefix]: Finished finitePrefix Result has 613 conditions, 599 events. 38/599 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 2406 event pairs, 0 based on Foata normal form. 0/433 useless extension candidates. Maximal degree in co-relation 486. Up to 8 conditions per place. [2023-08-26 15:27:02,322 INFO L119 LiptonReduction]: Number of co-enabled transitions 126784 [2023-08-26 15:27:18,962 INFO L134 LiptonReduction]: Checked pairs total: 262351 [2023-08-26 15:27:18,962 INFO L136 LiptonReduction]: Total number of compositions: 676 [2023-08-26 15:27:18,964 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 15:27:18,965 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;@15279d69, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 15:27:18,965 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 15:27:18,972 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 15:27:18,973 INFO L124 PetriNetUnfolderBase]: 6/78 cut-off events. [2023-08-26 15:27:18,973 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 15:27:18,973 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 15:27:18,973 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 15:27:18,973 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 15:27:18,973 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 15:27:18,973 INFO L85 PathProgramCache]: Analyzing trace with hash 783791890, now seen corresponding path program 1 times [2023-08-26 15:27:18,974 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 15:27:18,974 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80668659] [2023-08-26 15:27:18,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 15:27:18,974 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 15:27:18,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 15:27:19,050 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 15:27:19,051 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 15:27:19,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80668659] [2023-08-26 15:27:19,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80668659] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 15:27:19,051 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 15:27:19,051 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 15:27:19,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524182019] [2023-08-26 15:27:19,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 15:27:19,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 15:27:19,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 15:27:19,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 15:27:19,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 15:27:19,054 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 445 out of 1223 [2023-08-26 15:27:19,056 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 182 places, 199 transitions, 416 flow. Second operand has 3 states, 3 states have (on average 447.0) internal successors, (1341), 3 states have internal predecessors, (1341), 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 15:27:19,056 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 15:27:19,056 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 445 of 1223 [2023-08-26 15:27:19,056 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 15:27:24,695 INFO L124 PetriNetUnfolderBase]: 50497/77426 cut-off events. [2023-08-26 15:27:24,696 INFO L125 PetriNetUnfolderBase]: For 408/408 co-relation queries the response was YES. [2023-08-26 15:27:24,784 INFO L83 FinitePrefix]: Finished finitePrefix Result has 152536 conditions, 77426 events. 50497/77426 cut-off events. For 408/408 co-relation queries the response was YES. Maximal size of possible extension queue 2281. Compared 592872 event pairs, 44524 based on Foata normal form. 987/31773 useless extension candidates. Maximal degree in co-relation 136829. Up to 74851 conditions per place. [2023-08-26 15:27:24,913 INFO L140 encePairwiseOnDemand]: 1165/1223 looper letters, 113 selfloop transitions, 2 changer transitions 11/142 dead transitions. [2023-08-26 15:27:24,913 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 133 places, 142 transitions, 552 flow [2023-08-26 15:27:24,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 15:27:24,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 15:27:24,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1516 transitions. [2023-08-26 15:27:24,921 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.41319160534205507 [2023-08-26 15:27:24,922 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1516 transitions. [2023-08-26 15:27:24,922 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1516 transitions. [2023-08-26 15:27:24,923 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 15:27:24,923 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1516 transitions. [2023-08-26 15:27:24,926 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 505.3333333333333) internal successors, (1516), 3 states have internal predecessors, (1516), 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 15:27:24,933 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1223.0) internal successors, (4892), 4 states have internal predecessors, (4892), 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 15:27:24,935 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1223.0) internal successors, (4892), 4 states have internal predecessors, (4892), 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 15:27:24,936 INFO L175 Difference]: Start difference. First operand has 182 places, 199 transitions, 416 flow. Second operand 3 states and 1516 transitions. [2023-08-26 15:27:24,936 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 133 places, 142 transitions, 552 flow [2023-08-26 15:27:24,940 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 133 places, 142 transitions, 552 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 15:27:24,943 INFO L231 Difference]: Finished difference. Result has 134 places, 131 transitions, 284 flow [2023-08-26 15:27:24,943 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1223, PETRI_DIFFERENCE_MINUEND_FLOW=300, PETRI_DIFFERENCE_MINUEND_PLACES=131, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=141, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=139, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=284, PETRI_PLACES=134, PETRI_TRANSITIONS=131} [2023-08-26 15:27:24,945 INFO L281 CegarLoopForPetriNet]: 182 programPoint places, -48 predicate places. [2023-08-26 15:27:24,945 INFO L495 AbstractCegarLoop]: Abstraction has has 134 places, 131 transitions, 284 flow [2023-08-26 15:27:24,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 447.0) internal successors, (1341), 3 states have internal predecessors, (1341), 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 15:27:24,946 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 15:27:24,947 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 15:27:24,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 15:27:24,947 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 15:27:24,947 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 15:27:24,947 INFO L85 PathProgramCache]: Analyzing trace with hash 632813503, now seen corresponding path program 1 times [2023-08-26 15:27:24,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 15:27:24,948 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202495803] [2023-08-26 15:27:24,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 15:27:24,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 15:27:24,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 15:27:25,058 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 15:27:25,058 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 15:27:25,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202495803] [2023-08-26 15:27:25,058 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202495803] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 15:27:25,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [211502864] [2023-08-26 15:27:25,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 15:27:25,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 15:27:25,062 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 15:27:25,063 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 15:27:25,066 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 15:27:25,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 15:27:25,212 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 5 conjunts are in the unsatisfiable core [2023-08-26 15:27:25,213 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 15:27:25,245 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 15:27:25,246 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 15:27:25,271 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 15:27:25,272 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [211502864] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 15:27:25,272 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 15:27:25,272 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2023-08-26 15:27:25,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229623220] [2023-08-26 15:27:25,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 15:27:25,273 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 15:27:25,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 15:27:25,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 15:27:25,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2023-08-26 15:27:25,277 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 445 out of 1223 [2023-08-26 15:27:25,281 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 134 places, 131 transitions, 284 flow. Second operand has 8 states, 8 states have (on average 446.625) internal successors, (3573), 8 states have internal predecessors, (3573), 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 15:27:25,281 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 15:27:25,281 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 445 of 1223 [2023-08-26 15:27:25,282 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 15:27:27,130 INFO L124 PetriNetUnfolderBase]: 13376/21336 cut-off events. [2023-08-26 15:27:27,130 INFO L125 PetriNetUnfolderBase]: For 147/147 co-relation queries the response was YES. [2023-08-26 15:27:27,156 INFO L83 FinitePrefix]: Finished finitePrefix Result has 42085 conditions, 21336 events. 13376/21336 cut-off events. For 147/147 co-relation queries the response was YES. Maximal size of possible extension queue 766. Compared 151831 event pairs, 11611 based on Foata normal form. 0/11782 useless extension candidates. Maximal degree in co-relation 42072. Up to 20580 conditions per place. [2023-08-26 15:27:27,209 INFO L140 encePairwiseOnDemand]: 1220/1223 looper letters, 113 selfloop transitions, 3 changer transitions 0/132 dead transitions. [2023-08-26 15:27:27,210 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 128 places, 132 transitions, 520 flow [2023-08-26 15:27:27,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 15:27:27,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 15:27:27,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 1897 transitions. [2023-08-26 15:27:27,215 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.38777596075224857 [2023-08-26 15:27:27,215 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 1897 transitions. [2023-08-26 15:27:27,215 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 1897 transitions. [2023-08-26 15:27:27,217 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 15:27:27,217 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 1897 transitions. [2023-08-26 15:27:27,221 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 474.25) internal successors, (1897), 4 states have internal predecessors, (1897), 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 15:27:27,228 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 1223.0) internal successors, (6115), 5 states have internal predecessors, (6115), 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 15:27:27,231 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 1223.0) internal successors, (6115), 5 states have internal predecessors, (6115), 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 15:27:27,231 INFO L175 Difference]: Start difference. First operand has 134 places, 131 transitions, 284 flow. Second operand 4 states and 1897 transitions. [2023-08-26 15:27:27,231 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 128 places, 132 transitions, 520 flow [2023-08-26 15:27:27,232 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 127 places, 132 transitions, 514 flow, removed 2 selfloop flow, removed 1 redundant places. [2023-08-26 15:27:27,234 INFO L231 Difference]: Finished difference. Result has 128 places, 132 transitions, 294 flow [2023-08-26 15:27:27,234 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1223, PETRI_DIFFERENCE_MINUEND_FLOW=278, PETRI_DIFFERENCE_MINUEND_PLACES=124, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=131, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=128, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=294, PETRI_PLACES=128, PETRI_TRANSITIONS=132} [2023-08-26 15:27:27,235 INFO L281 CegarLoopForPetriNet]: 182 programPoint places, -54 predicate places. [2023-08-26 15:27:27,235 INFO L495 AbstractCegarLoop]: Abstraction has has 128 places, 132 transitions, 294 flow [2023-08-26 15:27:27,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 446.625) internal successors, (3573), 8 states have internal predecessors, (3573), 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 15:27:27,237 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 15:27:27,237 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 15:27:27,246 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-08-26 15:27:27,443 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 15:27:27,444 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 15:27:27,444 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 15:27:27,444 INFO L85 PathProgramCache]: Analyzing trace with hash 247450802, now seen corresponding path program 2 times [2023-08-26 15:27:27,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 15:27:27,444 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138556040] [2023-08-26 15:27:27,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 15:27:27,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 15:27:27,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 15:27:27,479 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 15:27:27,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 15:27:27,524 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 15:27:27,524 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 15:27:27,525 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 15:27:27,525 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 15:27:27,525 INFO L445 BasicCegarLoop]: Path program histogram: [2, 1] [2023-08-26 15:27:27,525 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-26 15:27:27,526 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 15:27:27,526 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 15:27:27,621 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 15:27:27,626 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 734 places, 773 transitions, 1576 flow [2023-08-26 15:27:27,867 INFO L124 PetriNetUnfolderBase]: 61/906 cut-off events. [2023-08-26 15:27:27,867 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 15:27:27,900 INFO L83 FinitePrefix]: Finished finitePrefix Result has 934 conditions, 906 events. 61/906 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 27. Compared 4614 event pairs, 1 based on Foata normal form. 0/644 useless extension candidates. Maximal degree in co-relation 742. Up to 16 conditions per place. [2023-08-26 15:27:27,901 INFO L82 GeneralOperation]: Start removeDead. Operand has 734 places, 773 transitions, 1576 flow [2023-08-26 15:27:27,909 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 726 places, 765 transitions, 1560 flow [2023-08-26 15:27:27,909 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 15:27:27,909 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 726 places, 765 transitions, 1560 flow [2023-08-26 15:27:27,910 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 726 places, 765 transitions, 1560 flow [2023-08-26 15:27:27,910 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 726 places, 765 transitions, 1560 flow [2023-08-26 15:27:28,084 INFO L124 PetriNetUnfolderBase]: 61/898 cut-off events. [2023-08-26 15:27:28,084 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 15:27:28,107 INFO L83 FinitePrefix]: Finished finitePrefix Result has 926 conditions, 898 events. 61/898 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 27. Compared 4580 event pairs, 1 based on Foata normal form. 0/644 useless extension candidates. Maximal degree in co-relation 742. Up to 16 conditions per place. [2023-08-26 15:27:28,199 INFO L119 LiptonReduction]: Number of co-enabled transitions 342720 [2023-08-26 15:27:49,703 INFO L134 LiptonReduction]: Checked pairs total: 692382 [2023-08-26 15:27:49,704 INFO L136 LiptonReduction]: Total number of compositions: 909 [2023-08-26 15:27:49,713 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 15:27:49,718 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;@15279d69, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 15:27:49,718 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 15:27:49,741 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 15:27:49,741 INFO L124 PetriNetUnfolderBase]: 16/183 cut-off events. [2023-08-26 15:27:49,741 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 15:27:49,741 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 15:27:49,741 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-08-26 15:27:49,742 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 15:27:49,742 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 15:27:49,742 INFO L85 PathProgramCache]: Analyzing trace with hash -745279966, now seen corresponding path program 1 times [2023-08-26 15:27:49,742 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 15:27:49,742 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593943217] [2023-08-26 15:27:49,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 15:27:49,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 15:27:49,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 15:27:49,815 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 15:27:49,815 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 15:27:49,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593943217] [2023-08-26 15:27:49,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1593943217] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 15:27:49,816 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 15:27:49,816 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 15:27:49,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259277007] [2023-08-26 15:27:49,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 15:27:49,816 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 15:27:49,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 15:27:49,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 15:27:49,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 15:27:49,819 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 627 out of 1682 [2023-08-26 15:27:49,821 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 265 places, 289 transitions, 608 flow. Second operand has 3 states, 3 states have (on average 629.3333333333334) internal successors, (1888), 3 states have internal predecessors, (1888), 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 15:27:49,821 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 15:27:49,821 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 627 of 1682 [2023-08-26 15:27:49,822 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand