/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 PROGRAM_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_02-simple_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 18:41:26,568 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 18:41:26,639 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 18:41:26,643 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 18:41:26,644 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 18:41:26,683 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 18:41:26,684 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 18:41:26,689 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 18:41:26,689 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 18:41:26,690 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 18:41:26,690 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 18:41:26,691 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 18:41:26,691 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 18:41:26,691 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 18:41:26,691 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 18:41:26,692 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 18:41:26,692 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 18:41:26,692 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 18:41:26,693 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 18:41:26,693 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 18:41:26,693 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 18:41:26,697 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 18:41:26,697 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 18:41:26,697 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 18:41:26,700 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 18:41:26,700 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 18:41:26,700 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 18:41:26,701 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:41:26,701 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 18:41:26,701 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 18:41:26,702 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 18:41:26,702 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 18:41:26,702 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 18:41:26,703 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 18:41:26,703 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 18:41:26,703 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 18:41:27,045 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 18:41:27,068 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 18:41:27,070 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 18:41:27,071 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 18:41:27,072 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 18:41:27,073 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_02-simple_racefree.i [2023-08-26 18:41:28,149 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 18:41:28,407 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 18:41:28,408 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_02-simple_racefree.i [2023-08-26 18:41:28,430 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0dada31c3/7acbf7bd65534eccbaddd545bab83297/FLAGd44df2785 [2023-08-26 18:41:28,441 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0dada31c3/7acbf7bd65534eccbaddd545bab83297 [2023-08-26 18:41:28,443 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 18:41:28,444 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 18:41:28,445 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 18:41:28,445 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 18:41:28,447 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 18:41:28,448 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,449 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57f2c2d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28, skipping insertion in model container [2023-08-26 18:41:28,449 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,489 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 18:41:28,836 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:41:28,852 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 18:41:28,880 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 18:41:28,882 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 18:41:28,902 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:41:28,951 INFO L206 MainTranslator]: Completed translation [2023-08-26 18:41:28,951 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28 WrapperNode [2023-08-26 18:41:28,952 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 18:41:28,953 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 18:41:28,953 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 18:41:28,953 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 18:41:28,958 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,986 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:29,013 INFO L138 Inliner]: procedures = 170, calls = 31, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 85 [2023-08-26 18:41:29,014 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 18:41:29,014 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 18:41:29,015 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 18:41:29,015 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 18:41:29,022 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:29,023 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:29,035 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:29,036 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:29,044 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:29,047 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:29,049 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:29,050 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:29,052 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 18:41:29,063 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 18:41:29,064 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 18:41:29,064 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 18:41:29,064 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:29,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:41:29,084 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:41:29,098 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 18:41:29,118 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 18:41:29,140 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 18:41:29,140 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 18:41:29,140 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 18:41:29,141 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 18:41:29,141 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 18:41:29,141 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 18:41:29,141 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 18:41:29,141 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 18:41:29,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 18:41:29,142 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 18:41:29,142 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 18:41:29,143 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 18:41:29,299 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 18:41:29,301 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 18:41:29,508 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 18:41:29,515 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 18:41:29,515 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-08-26 18:41:29,517 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:41:29 BoogieIcfgContainer [2023-08-26 18:41:29,517 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 18:41:29,519 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 18:41:29,519 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 18:41:29,522 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 18:41:29,522 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 06:41:28" (1/3) ... [2023-08-26 18:41:29,523 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15cb57b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:41:29, skipping insertion in model container [2023-08-26 18:41:29,523 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (2/3) ... [2023-08-26 18:41:29,523 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15cb57b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:41:29, skipping insertion in model container [2023-08-26 18:41:29,523 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:41:29" (3/3) ... [2023-08-26 18:41:29,525 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_02-simple_racefree.i [2023-08-26 18:41:29,541 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 18:41:29,541 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-08-26 18:41:29,542 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 18:41:29,638 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 18:41:29,676 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 108 places, 118 transitions, 244 flow [2023-08-26 18:41:29,760 INFO L124 PetriNetUnfolderBase]: 19/161 cut-off events. [2023-08-26 18:41:29,761 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:41:29,766 INFO L83 FinitePrefix]: Finished finitePrefix Result has 167 conditions, 161 events. 19/161 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 394 event pairs, 0 based on Foata normal form. 0/129 useless extension candidates. Maximal degree in co-relation 78. Up to 4 conditions per place. [2023-08-26 18:41:29,766 INFO L82 GeneralOperation]: Start removeDead. Operand has 108 places, 118 transitions, 244 flow [2023-08-26 18:41:29,772 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 108 places, 118 transitions, 244 flow [2023-08-26 18:41:29,777 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:29,788 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 108 places, 118 transitions, 244 flow [2023-08-26 18:41:29,791 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 108 places, 118 transitions, 244 flow [2023-08-26 18:41:29,792 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 108 places, 118 transitions, 244 flow [2023-08-26 18:41:29,849 INFO L124 PetriNetUnfolderBase]: 19/161 cut-off events. [2023-08-26 18:41:29,849 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:41:29,851 INFO L83 FinitePrefix]: Finished finitePrefix Result has 167 conditions, 161 events. 19/161 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 394 event pairs, 0 based on Foata normal form. 0/129 useless extension candidates. Maximal degree in co-relation 78. Up to 4 conditions per place. [2023-08-26 18:41:29,853 INFO L119 LiptonReduction]: Number of co-enabled transitions 2744 [2023-08-26 18:41:32,864 INFO L134 LiptonReduction]: Checked pairs total: 4871 [2023-08-26 18:41:32,865 INFO L136 LiptonReduction]: Total number of compositions: 107 [2023-08-26 18:41:32,876 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:41:32,882 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;@26fdd7c2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:41:32,882 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:41:32,884 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:41:32,885 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:41:32,885 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:41:32,885 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:32,885 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:32,886 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:32,890 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:32,890 INFO L85 PathProgramCache]: Analyzing trace with hash 14664, now seen corresponding path program 1 times [2023-08-26 18:41:32,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:32,898 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369064721] [2023-08-26 18:41:32,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:32,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:32,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:33,095 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:33,096 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:33,096 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369064721] [2023-08-26 18:41:33,096 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [369064721] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:33,096 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:33,097 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:33,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003954204] [2023-08-26 18:41:33,098 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:33,104 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:33,108 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:33,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:33,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:33,125 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 88 out of 225 [2023-08-26 18:41:33,127 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 31 places, 38 transitions, 84 flow. Second operand has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 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 18:41:33,127 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:33,128 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 88 of 225 [2023-08-26 18:41:33,128 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:33,208 INFO L124 PetriNetUnfolderBase]: 89/220 cut-off events. [2023-08-26 18:41:33,208 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:41:33,208 INFO L83 FinitePrefix]: Finished finitePrefix Result has 436 conditions, 220 events. 89/220 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 806 event pairs, 80 based on Foata normal form. 12/180 useless extension candidates. Maximal degree in co-relation 399. Up to 191 conditions per place. [2023-08-26 18:41:33,210 INFO L140 encePairwiseOnDemand]: 212/225 looper letters, 21 selfloop transitions, 1 changer transitions 10/34 dead transitions. [2023-08-26 18:41:33,210 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 30 places, 34 transitions, 138 flow [2023-08-26 18:41:33,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:33,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:33,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 312 transitions. [2023-08-26 18:41:33,229 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4622222222222222 [2023-08-26 18:41:33,230 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 312 transitions. [2023-08-26 18:41:33,231 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 312 transitions. [2023-08-26 18:41:33,234 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:33,236 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 312 transitions. [2023-08-26 18:41:33,240 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 104.0) internal successors, (312), 3 states have internal predecessors, (312), 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 18:41:33,245 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 225.0) internal successors, (900), 4 states have internal predecessors, (900), 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 18:41:33,245 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 225.0) internal successors, (900), 4 states have internal predecessors, (900), 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 18:41:33,247 INFO L175 Difference]: Start difference. First operand has 31 places, 38 transitions, 84 flow. Second operand 3 states and 312 transitions. [2023-08-26 18:41:33,248 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 30 places, 34 transitions, 138 flow [2023-08-26 18:41:33,250 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 34 transitions, 138 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:41:33,251 INFO L231 Difference]: Finished difference. Result has 30 places, 24 transitions, 56 flow [2023-08-26 18:41:33,252 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=225, PETRI_DIFFERENCE_MINUEND_FLOW=60, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=56, PETRI_PLACES=30, PETRI_TRANSITIONS=24} [2023-08-26 18:41:33,256 INFO L281 CegarLoopForPetriNet]: 31 programPoint places, -1 predicate places. [2023-08-26 18:41:33,256 INFO L495 AbstractCegarLoop]: Abstraction has has 30 places, 24 transitions, 56 flow [2023-08-26 18:41:33,256 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 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 18:41:33,256 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:33,257 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:33,257 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 18:41:33,257 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:33,265 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:33,265 INFO L85 PathProgramCache]: Analyzing trace with hash 14662, now seen corresponding path program 1 times [2023-08-26 18:41:33,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:33,266 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24983389] [2023-08-26 18:41:33,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:33,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:33,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:33,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:33,437 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:33,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [24983389] [2023-08-26 18:41:33,438 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [24983389] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:33,438 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:33,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:33,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170316186] [2023-08-26 18:41:33,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:33,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:33,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:33,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:33,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:33,443 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 83 out of 225 [2023-08-26 18:41:33,444 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 24 transitions, 56 flow. Second operand has 3 states, 3 states have (on average 83.66666666666667) internal successors, (251), 3 states have internal predecessors, (251), 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 18:41:33,444 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:33,444 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 83 of 225 [2023-08-26 18:41:33,444 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:33,517 INFO L124 PetriNetUnfolderBase]: 80/189 cut-off events. [2023-08-26 18:41:33,517 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:41:33,520 INFO L83 FinitePrefix]: Finished finitePrefix Result has 382 conditions, 189 events. 80/189 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 635 event pairs, 63 based on Foata normal form. 0/151 useless extension candidates. Maximal degree in co-relation 375. Up to 175 conditions per place. [2023-08-26 18:41:33,523 INFO L140 encePairwiseOnDemand]: 221/225 looper letters, 28 selfloop transitions, 2 changer transitions 1/33 dead transitions. [2023-08-26 18:41:33,523 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 30 places, 33 transitions, 136 flow [2023-08-26 18:41:33,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:33,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:33,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 282 transitions. [2023-08-26 18:41:33,526 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4177777777777778 [2023-08-26 18:41:33,526 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 282 transitions. [2023-08-26 18:41:33,526 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 282 transitions. [2023-08-26 18:41:33,526 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:33,527 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 282 transitions. [2023-08-26 18:41:33,528 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 94.0) internal successors, (282), 3 states have internal predecessors, (282), 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 18:41:33,531 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 225.0) internal successors, (900), 4 states have internal predecessors, (900), 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 18:41:33,532 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 225.0) internal successors, (900), 4 states have internal predecessors, (900), 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 18:41:33,532 INFO L175 Difference]: Start difference. First operand has 30 places, 24 transitions, 56 flow. Second operand 3 states and 282 transitions. [2023-08-26 18:41:33,532 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 30 places, 33 transitions, 136 flow [2023-08-26 18:41:33,533 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 33 transitions, 133 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:41:33,533 INFO L231 Difference]: Finished difference. Result has 29 places, 24 transitions, 63 flow [2023-08-26 18:41:33,533 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=225, PETRI_DIFFERENCE_MINUEND_FLOW=53, PETRI_DIFFERENCE_MINUEND_PLACES=26, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=24, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=63, PETRI_PLACES=29, PETRI_TRANSITIONS=24} [2023-08-26 18:41:33,534 INFO L281 CegarLoopForPetriNet]: 31 programPoint places, -2 predicate places. [2023-08-26 18:41:33,535 INFO L495 AbstractCegarLoop]: Abstraction has has 29 places, 24 transitions, 63 flow [2023-08-26 18:41:33,536 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 83.66666666666667) internal successors, (251), 3 states have internal predecessors, (251), 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 18:41:33,536 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:33,538 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 18:41:33,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 18:41:33,539 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:33,542 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:33,542 INFO L85 PathProgramCache]: Analyzing trace with hash 437147150, now seen corresponding path program 1 times [2023-08-26 18:41:33,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:33,543 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838050797] [2023-08-26 18:41:33,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:33,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:33,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:33,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:33,691 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:33,691 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838050797] [2023-08-26 18:41:33,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [838050797] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:41:33,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016810135] [2023-08-26 18:41:33,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:33,694 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:33,694 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:41:33,699 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 18:41:33,725 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 18:41:33,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:33,769 INFO L262 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:41:33,783 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:41:33,863 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:41:33,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:33,904 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:41:33,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:33,950 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016810135] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:41:33,950 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:41:33,950 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:41:33,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882582342] [2023-08-26 18:41:33,950 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:41:33,950 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:41:33,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:33,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:41:33,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:41:33,952 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 83 out of 225 [2023-08-26 18:41:33,953 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 24 transitions, 63 flow. Second operand has 8 states, 8 states have (on average 84.875) internal successors, (679), 8 states have internal predecessors, (679), 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 18:41:33,953 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:33,953 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 83 of 225 [2023-08-26 18:41:33,953 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:34,017 INFO L124 PetriNetUnfolderBase]: 16/46 cut-off events. [2023-08-26 18:41:34,017 INFO L125 PetriNetUnfolderBase]: For 8/8 co-relation queries the response was YES. [2023-08-26 18:41:34,018 INFO L83 FinitePrefix]: Finished finitePrefix Result has 117 conditions, 46 events. 16/46 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 81 event pairs, 0 based on Foata normal form. 9/55 useless extension candidates. Maximal degree in co-relation 108. Up to 34 conditions per place. [2023-08-26 18:41:34,018 INFO L140 encePairwiseOnDemand]: 221/225 looper letters, 0 selfloop transitions, 0 changer transitions 22/22 dead transitions. [2023-08-26 18:41:34,018 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 22 transitions, 95 flow [2023-08-26 18:41:34,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:41:34,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:41:34,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 355 transitions. [2023-08-26 18:41:34,020 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.39444444444444443 [2023-08-26 18:41:34,020 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 355 transitions. [2023-08-26 18:41:34,020 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 355 transitions. [2023-08-26 18:41:34,020 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:34,020 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 355 transitions. [2023-08-26 18:41:34,021 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 88.75) internal successors, (355), 4 states have internal predecessors, (355), 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 18:41:34,023 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 225.0) internal successors, (1125), 5 states have internal predecessors, (1125), 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 18:41:34,023 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 225.0) internal successors, (1125), 5 states have internal predecessors, (1125), 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 18:41:34,023 INFO L175 Difference]: Start difference. First operand has 29 places, 24 transitions, 63 flow. Second operand 4 states and 355 transitions. [2023-08-26 18:41:34,024 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 22 transitions, 95 flow [2023-08-26 18:41:34,024 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 19 places, 22 transitions, 89 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-26 18:41:34,024 INFO L231 Difference]: Finished difference. Result has 19 places, 0 transitions, 0 flow [2023-08-26 18:41:34,024 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=225, PETRI_DIFFERENCE_MINUEND_FLOW=29, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=13, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=19, PETRI_TRANSITIONS=0} [2023-08-26 18:41:34,025 INFO L281 CegarLoopForPetriNet]: 31 programPoint places, -12 predicate places. [2023-08-26 18:41:34,025 INFO L495 AbstractCegarLoop]: Abstraction has has 19 places, 0 transitions, 0 flow [2023-08-26 18:41:34,026 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 84.875) internal successors, (679), 8 states have internal predecessors, (679), 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 18:41:34,028 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:41:34,028 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:41:34,029 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:41:34,029 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:41:34,029 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:41:34,038 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 18:41:34,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:34,234 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-26 18:41:34,236 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:41:34,239 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 108 places, 118 transitions, 244 flow [2023-08-26 18:41:34,256 INFO L124 PetriNetUnfolderBase]: 19/161 cut-off events. [2023-08-26 18:41:34,256 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:41:34,257 INFO L83 FinitePrefix]: Finished finitePrefix Result has 167 conditions, 161 events. 19/161 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 394 event pairs, 0 based on Foata normal form. 0/129 useless extension candidates. Maximal degree in co-relation 78. Up to 4 conditions per place. [2023-08-26 18:41:34,257 INFO L82 GeneralOperation]: Start removeDead. Operand has 108 places, 118 transitions, 244 flow [2023-08-26 18:41:34,258 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 104 places, 113 transitions, 231 flow [2023-08-26 18:41:34,258 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:34,258 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 104 places, 113 transitions, 231 flow [2023-08-26 18:41:34,258 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 104 places, 113 transitions, 231 flow [2023-08-26 18:41:34,258 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 104 places, 113 transitions, 231 flow [2023-08-26 18:41:34,271 INFO L124 PetriNetUnfolderBase]: 18/156 cut-off events. [2023-08-26 18:41:34,271 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:41:34,271 INFO L83 FinitePrefix]: Finished finitePrefix Result has 161 conditions, 156 events. 18/156 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 376 event pairs, 0 based on Foata normal form. 0/124 useless extension candidates. Maximal degree in co-relation 78. Up to 4 conditions per place. [2023-08-26 18:41:34,273 INFO L119 LiptonReduction]: Number of co-enabled transitions 2744 [2023-08-26 18:41:36,685 INFO L134 LiptonReduction]: Checked pairs total: 4827 [2023-08-26 18:41:36,685 INFO L136 LiptonReduction]: Total number of compositions: 100 [2023-08-26 18:41:36,687 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:41:36,687 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;@26fdd7c2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:41:36,687 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:41:36,690 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:41:36,691 INFO L124 PetriNetUnfolderBase]: 4/30 cut-off events. [2023-08-26 18:41:36,691 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:41:36,691 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:36,691 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 18:41:36,691 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:41:36,691 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:36,691 INFO L85 PathProgramCache]: Analyzing trace with hash -665553328, now seen corresponding path program 1 times [2023-08-26 18:41:36,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:36,692 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014351350] [2023-08-26 18:41:36,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:36,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:36,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:41:36,716 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:41:36,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:41:36,755 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:41:36,755 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:41:36,755 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:41:36,756 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 18:41:36,756 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:41:36,757 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:41:36,757 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:41:36,757 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 18:41:36,779 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 18:41:36,783 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 133 places, 148 transitions, 314 flow [2023-08-26 18:41:36,813 INFO L124 PetriNetUnfolderBase]: 34/261 cut-off events. [2023-08-26 18:41:36,813 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:41:36,815 INFO L83 FinitePrefix]: Finished finitePrefix Result has 275 conditions, 261 events. 34/261 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 778 event pairs, 0 based on Foata normal form. 0/206 useless extension candidates. Maximal degree in co-relation 163. Up to 8 conditions per place. [2023-08-26 18:41:36,815 INFO L82 GeneralOperation]: Start removeDead. Operand has 133 places, 148 transitions, 314 flow [2023-08-26 18:41:36,816 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 133 places, 148 transitions, 314 flow [2023-08-26 18:41:36,817 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:36,817 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 133 places, 148 transitions, 314 flow [2023-08-26 18:41:36,817 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 133 places, 148 transitions, 314 flow [2023-08-26 18:41:36,818 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 133 places, 148 transitions, 314 flow [2023-08-26 18:41:36,848 INFO L124 PetriNetUnfolderBase]: 34/261 cut-off events. [2023-08-26 18:41:36,848 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:41:36,850 INFO L83 FinitePrefix]: Finished finitePrefix Result has 275 conditions, 261 events. 34/261 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 778 event pairs, 0 based on Foata normal form. 0/206 useless extension candidates. Maximal degree in co-relation 163. Up to 8 conditions per place. [2023-08-26 18:41:36,854 INFO L119 LiptonReduction]: Number of co-enabled transitions 7672 [2023-08-26 18:41:39,439 INFO L134 LiptonReduction]: Checked pairs total: 20199 [2023-08-26 18:41:39,439 INFO L136 LiptonReduction]: Total number of compositions: 112 [2023-08-26 18:41:39,441 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:41:39,442 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;@26fdd7c2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:41:39,442 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:41:39,444 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:41:39,444 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:41:39,444 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:41:39,444 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:39,444 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:39,444 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:39,444 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:39,445 INFO L85 PathProgramCache]: Analyzing trace with hash 27140, now seen corresponding path program 1 times [2023-08-26 18:41:39,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:39,445 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760122197] [2023-08-26 18:41:39,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:39,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:39,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:39,508 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:39,508 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:39,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760122197] [2023-08-26 18:41:39,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760122197] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:39,508 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:39,508 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:39,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573623748] [2023-08-26 18:41:39,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:39,509 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:39,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:39,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:39,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:39,511 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 105 out of 260 [2023-08-26 18:41:39,512 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 50 places, 63 transitions, 144 flow. Second operand has 3 states, 3 states have (on average 105.66666666666667) internal successors, (317), 3 states have internal predecessors, (317), 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 18:41:39,512 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:39,512 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 105 of 260 [2023-08-26 18:41:39,512 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:39,849 INFO L124 PetriNetUnfolderBase]: 1740/3196 cut-off events. [2023-08-26 18:41:39,849 INFO L125 PetriNetUnfolderBase]: For 41/41 co-relation queries the response was YES. [2023-08-26 18:41:39,852 INFO L83 FinitePrefix]: Finished finitePrefix Result has 6109 conditions, 3196 events. 1740/3196 cut-off events. For 41/41 co-relation queries the response was YES. Maximal size of possible extension queue 141. Compared 20274 event pairs, 1577 based on Foata normal form. 705/3260 useless extension candidates. Maximal degree in co-relation 3159. Up to 2851 conditions per place. [2023-08-26 18:41:39,863 INFO L140 encePairwiseOnDemand]: 240/260 looper letters, 39 selfloop transitions, 2 changer transitions 3/55 dead transitions. [2023-08-26 18:41:39,863 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 51 places, 55 transitions, 214 flow [2023-08-26 18:41:39,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:39,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:39,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 382 transitions. [2023-08-26 18:41:39,865 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4897435897435897 [2023-08-26 18:41:39,865 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 382 transitions. [2023-08-26 18:41:39,866 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 382 transitions. [2023-08-26 18:41:39,866 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:39,866 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 382 transitions. [2023-08-26 18:41:39,867 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 127.33333333333333) internal successors, (382), 3 states have internal predecessors, (382), 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 18:41:39,868 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 260.0) internal successors, (1040), 4 states have internal predecessors, (1040), 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 18:41:39,869 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 260.0) internal successors, (1040), 4 states have internal predecessors, (1040), 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 18:41:39,869 INFO L175 Difference]: Start difference. First operand has 50 places, 63 transitions, 144 flow. Second operand 3 states and 382 transitions. [2023-08-26 18:41:39,869 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 51 places, 55 transitions, 214 flow [2023-08-26 18:41:39,873 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 51 places, 55 transitions, 214 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:41:39,874 INFO L231 Difference]: Finished difference. Result has 52 places, 44 transitions, 114 flow [2023-08-26 18:41:39,874 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=260, PETRI_DIFFERENCE_MINUEND_FLOW=110, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=46, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=44, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=114, PETRI_PLACES=52, PETRI_TRANSITIONS=44} [2023-08-26 18:41:39,878 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, 2 predicate places. [2023-08-26 18:41:39,878 INFO L495 AbstractCegarLoop]: Abstraction has has 52 places, 44 transitions, 114 flow [2023-08-26 18:41:39,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 105.66666666666667) internal successors, (317), 3 states have internal predecessors, (317), 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 18:41:39,878 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:39,878 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:39,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 18:41:39,879 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:39,879 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:39,879 INFO L85 PathProgramCache]: Analyzing trace with hash 27139, now seen corresponding path program 1 times [2023-08-26 18:41:39,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:39,879 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4953429] [2023-08-26 18:41:39,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:39,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:39,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:39,916 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:39,916 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:39,916 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4953429] [2023-08-26 18:41:39,916 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [4953429] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:39,916 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:39,917 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:39,917 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126050172] [2023-08-26 18:41:39,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:39,917 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:39,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:39,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:39,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:39,919 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 110 out of 260 [2023-08-26 18:41:39,919 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 52 places, 44 transitions, 114 flow. Second operand has 3 states, 3 states have (on average 110.66666666666667) internal successors, (332), 3 states have internal predecessors, (332), 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 18:41:39,922 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:39,922 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 110 of 260 [2023-08-26 18:41:39,922 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:40,127 INFO L124 PetriNetUnfolderBase]: 1260/2312 cut-off events. [2023-08-26 18:41:40,128 INFO L125 PetriNetUnfolderBase]: For 178/178 co-relation queries the response was YES. [2023-08-26 18:41:40,131 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4656 conditions, 2312 events. 1260/2312 cut-off events. For 178/178 co-relation queries the response was YES. Maximal size of possible extension queue 101. Compared 13883 event pairs, 1252 based on Foata normal form. 0/2051 useless extension candidates. Maximal degree in co-relation 4595. Up to 2079 conditions per place. [2023-08-26 18:41:40,140 INFO L140 encePairwiseOnDemand]: 257/260 looper letters, 30 selfloop transitions, 1 changer transitions 0/42 dead transitions. [2023-08-26 18:41:40,140 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 42 transitions, 172 flow [2023-08-26 18:41:40,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:40,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:40,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 362 transitions. [2023-08-26 18:41:40,142 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4641025641025641 [2023-08-26 18:41:40,142 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 362 transitions. [2023-08-26 18:41:40,142 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 362 transitions. [2023-08-26 18:41:40,142 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:40,142 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 362 transitions. [2023-08-26 18:41:40,143 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 120.66666666666667) internal successors, (362), 3 states have internal predecessors, (362), 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 18:41:40,144 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 260.0) internal successors, (1040), 4 states have internal predecessors, (1040), 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 18:41:40,145 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 260.0) internal successors, (1040), 4 states have internal predecessors, (1040), 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 18:41:40,145 INFO L175 Difference]: Start difference. First operand has 52 places, 44 transitions, 114 flow. Second operand 3 states and 362 transitions. [2023-08-26 18:41:40,145 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 42 transitions, 172 flow [2023-08-26 18:41:40,148 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 47 places, 42 transitions, 168 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:41:40,149 INFO L231 Difference]: Finished difference. Result has 47 places, 42 transitions, 108 flow [2023-08-26 18:41:40,150 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=260, PETRI_DIFFERENCE_MINUEND_FLOW=106, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=42, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=41, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=108, PETRI_PLACES=47, PETRI_TRANSITIONS=42} [2023-08-26 18:41:40,151 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, -3 predicate places. [2023-08-26 18:41:40,151 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 42 transitions, 108 flow [2023-08-26 18:41:40,152 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 110.66666666666667) internal successors, (332), 3 states have internal predecessors, (332), 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 18:41:40,152 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:40,152 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:41:40,152 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 18:41:40,152 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:40,152 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:40,152 INFO L85 PathProgramCache]: Analyzing trace with hash -682940394, now seen corresponding path program 1 times [2023-08-26 18:41:40,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:40,158 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487285890] [2023-08-26 18:41:40,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:40,158 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:40,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:40,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:40,253 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:40,255 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487285890] [2023-08-26 18:41:40,255 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [487285890] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:41:40,255 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797045151] [2023-08-26 18:41:40,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:40,256 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:40,256 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:41:40,257 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 18:41:40,289 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-26 18:41:40,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:40,325 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:41:40,326 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:41:40,335 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:41:40,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:40,370 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:41:40,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:40,408 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797045151] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:41:40,408 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:41:40,408 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-08-26 18:41:40,408 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507037179] [2023-08-26 18:41:40,408 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:41:40,408 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 18:41:40,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:40,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 18:41:40,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-08-26 18:41:40,409 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 105 out of 260 [2023-08-26 18:41:40,410 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 47 places, 42 transitions, 108 flow. Second operand has 7 states, 7 states have (on average 106.71428571428571) internal successors, (747), 7 states have internal predecessors, (747), 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 18:41:40,410 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:40,411 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 105 of 260 [2023-08-26 18:41:40,411 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:40,653 INFO L124 PetriNetUnfolderBase]: 1113/1962 cut-off events. [2023-08-26 18:41:40,653 INFO L125 PetriNetUnfolderBase]: For 136/136 co-relation queries the response was YES. [2023-08-26 18:41:40,656 INFO L83 FinitePrefix]: Finished finitePrefix Result has 3971 conditions, 1962 events. 1113/1962 cut-off events. For 136/136 co-relation queries the response was YES. Maximal size of possible extension queue 92. Compared 11566 event pairs, 50 based on Foata normal form. 7/1826 useless extension candidates. Maximal degree in co-relation 3961. Up to 1337 conditions per place. [2023-08-26 18:41:40,663 INFO L140 encePairwiseOnDemand]: 256/260 looper letters, 61 selfloop transitions, 4 changer transitions 1/77 dead transitions. [2023-08-26 18:41:40,664 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 50 places, 77 transitions, 308 flow [2023-08-26 18:41:40,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 18:41:40,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 18:41:40,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 594 transitions. [2023-08-26 18:41:40,666 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45692307692307693 [2023-08-26 18:41:40,666 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 594 transitions. [2023-08-26 18:41:40,666 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 594 transitions. [2023-08-26 18:41:40,666 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:40,666 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 594 transitions. [2023-08-26 18:41:40,668 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 118.8) internal successors, (594), 5 states have internal predecessors, (594), 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 18:41:40,670 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 260.0) internal successors, (1560), 6 states have internal predecessors, (1560), 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 18:41:40,670 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 260.0) internal successors, (1560), 6 states have internal predecessors, (1560), 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 18:41:40,670 INFO L175 Difference]: Start difference. First operand has 47 places, 42 transitions, 108 flow. Second operand 5 states and 594 transitions. [2023-08-26 18:41:40,670 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 50 places, 77 transitions, 308 flow [2023-08-26 18:41:40,671 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 49 places, 77 transitions, 307 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:41:40,672 INFO L231 Difference]: Finished difference. Result has 49 places, 41 transitions, 111 flow [2023-08-26 18:41:40,672 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=260, PETRI_DIFFERENCE_MINUEND_FLOW=103, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=37, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=111, PETRI_PLACES=49, PETRI_TRANSITIONS=41} [2023-08-26 18:41:40,673 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, -1 predicate places. [2023-08-26 18:41:40,673 INFO L495 AbstractCegarLoop]: Abstraction has has 49 places, 41 transitions, 111 flow [2023-08-26 18:41:40,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 106.71428571428571) internal successors, (747), 7 states have internal predecessors, (747), 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 18:41:40,673 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:40,674 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 18:41:40,684 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 18:41:40,878 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,SelfDestructingSolverStorable6 [2023-08-26 18:41:40,878 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:40,879 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:40,879 INFO L85 PathProgramCache]: Analyzing trace with hash -2100604833, now seen corresponding path program 1 times [2023-08-26 18:41:40,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:40,879 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223043496] [2023-08-26 18:41:40,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:40,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:40,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:40,937 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 18:41:40,937 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:40,937 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223043496] [2023-08-26 18:41:40,937 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223043496] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:40,937 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:40,937 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:40,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359479027] [2023-08-26 18:41:40,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:40,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:40,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:40,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:40,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:40,939 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 115 out of 260 [2023-08-26 18:41:40,939 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 41 transitions, 111 flow. Second operand has 3 states, 3 states have (on average 117.66666666666667) internal successors, (353), 3 states have internal predecessors, (353), 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 18:41:40,939 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:40,939 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 115 of 260 [2023-08-26 18:41:40,939 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:41,221 INFO L124 PetriNetUnfolderBase]: 2159/3821 cut-off events. [2023-08-26 18:41:41,221 INFO L125 PetriNetUnfolderBase]: For 621/621 co-relation queries the response was YES. [2023-08-26 18:41:41,227 INFO L83 FinitePrefix]: Finished finitePrefix Result has 7840 conditions, 3821 events. 2159/3821 cut-off events. For 621/621 co-relation queries the response was YES. Maximal size of possible extension queue 155. Compared 23144 event pairs, 711 based on Foata normal form. 0/3520 useless extension candidates. Maximal degree in co-relation 7829. Up to 2468 conditions per place. [2023-08-26 18:41:41,243 INFO L140 encePairwiseOnDemand]: 253/260 looper letters, 57 selfloop transitions, 6 changer transitions 0/71 dead transitions. [2023-08-26 18:41:41,243 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 51 places, 71 transitions, 318 flow [2023-08-26 18:41:41,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:41,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:41,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 407 transitions. [2023-08-26 18:41:41,245 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5217948717948718 [2023-08-26 18:41:41,245 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 407 transitions. [2023-08-26 18:41:41,245 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 407 transitions. [2023-08-26 18:41:41,245 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:41,245 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 407 transitions. [2023-08-26 18:41:41,246 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 135.66666666666666) internal successors, (407), 3 states have internal predecessors, (407), 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 18:41:41,247 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 260.0) internal successors, (1040), 4 states have internal predecessors, (1040), 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 18:41:41,248 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 260.0) internal successors, (1040), 4 states have internal predecessors, (1040), 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 18:41:41,248 INFO L175 Difference]: Start difference. First operand has 49 places, 41 transitions, 111 flow. Second operand 3 states and 407 transitions. [2023-08-26 18:41:41,248 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 51 places, 71 transitions, 318 flow [2023-08-26 18:41:41,249 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 48 places, 71 transitions, 301 flow, removed 4 selfloop flow, removed 3 redundant places. [2023-08-26 18:41:41,250 INFO L231 Difference]: Finished difference. Result has 50 places, 46 transitions, 147 flow [2023-08-26 18:41:41,250 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=260, PETRI_DIFFERENCE_MINUEND_FLOW=101, PETRI_DIFFERENCE_MINUEND_PLACES=46, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=35, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=147, PETRI_PLACES=50, PETRI_TRANSITIONS=46} [2023-08-26 18:41:41,251 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, 0 predicate places. [2023-08-26 18:41:41,251 INFO L495 AbstractCegarLoop]: Abstraction has has 50 places, 46 transitions, 147 flow [2023-08-26 18:41:41,251 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 117.66666666666667) internal successors, (353), 3 states have internal predecessors, (353), 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 18:41:41,251 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:41,251 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:41:41,251 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 18:41:41,251 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:41,252 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:41,252 INFO L85 PathProgramCache]: Analyzing trace with hash -1444912192, now seen corresponding path program 1 times [2023-08-26 18:41:41,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:41,252 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814798528] [2023-08-26 18:41:41,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:41,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:41,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:41,351 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 18:41:41,352 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:41,352 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814798528] [2023-08-26 18:41:41,352 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814798528] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:41,352 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:41,352 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:41:41,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524426292] [2023-08-26 18:41:41,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:41,353 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:41:41,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:41,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:41:41,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:41:41,354 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 105 out of 260 [2023-08-26 18:41:41,355 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 50 places, 46 transitions, 147 flow. Second operand has 4 states, 4 states have (on average 107.5) internal successors, (430), 4 states have internal predecessors, (430), 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 18:41:41,355 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:41,355 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 105 of 260 [2023-08-26 18:41:41,355 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:41,572 INFO L124 PetriNetUnfolderBase]: 1456/2757 cut-off events. [2023-08-26 18:41:41,572 INFO L125 PetriNetUnfolderBase]: For 622/628 co-relation queries the response was YES. [2023-08-26 18:41:41,577 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5987 conditions, 2757 events. 1456/2757 cut-off events. For 622/628 co-relation queries the response was YES. Maximal size of possible extension queue 122. Compared 16796 event pairs, 912 based on Foata normal form. 0/2701 useless extension candidates. Maximal degree in co-relation 5975. Up to 1651 conditions per place. [2023-08-26 18:41:41,588 INFO L140 encePairwiseOnDemand]: 256/260 looper letters, 50 selfloop transitions, 3 changer transitions 0/66 dead transitions. [2023-08-26 18:41:41,588 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 53 places, 66 transitions, 310 flow [2023-08-26 18:41:41,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:41:41,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:41:41,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 468 transitions. [2023-08-26 18:41:41,590 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45 [2023-08-26 18:41:41,590 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 468 transitions. [2023-08-26 18:41:41,590 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 468 transitions. [2023-08-26 18:41:41,590 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:41,590 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 468 transitions. [2023-08-26 18:41:41,591 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 117.0) internal successors, (468), 4 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:41,593 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 260.0) internal successors, (1300), 5 states have internal predecessors, (1300), 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 18:41:41,593 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 260.0) internal successors, (1300), 5 states have internal predecessors, (1300), 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 18:41:41,593 INFO L175 Difference]: Start difference. First operand has 50 places, 46 transitions, 147 flow. Second operand 4 states and 468 transitions. [2023-08-26 18:41:41,594 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 53 places, 66 transitions, 310 flow [2023-08-26 18:41:41,598 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 51 places, 66 transitions, 294 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:41:41,600 INFO L231 Difference]: Finished difference. Result has 52 places, 47 transitions, 149 flow [2023-08-26 18:41:41,600 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=260, PETRI_DIFFERENCE_MINUEND_FLOW=135, PETRI_DIFFERENCE_MINUEND_PLACES=48, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=46, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=43, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=149, PETRI_PLACES=52, PETRI_TRANSITIONS=47} [2023-08-26 18:41:41,601 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, 2 predicate places. [2023-08-26 18:41:41,602 INFO L495 AbstractCegarLoop]: Abstraction has has 52 places, 47 transitions, 149 flow [2023-08-26 18:41:41,602 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 107.5) internal successors, (430), 4 states have internal predecessors, (430), 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 18:41:41,602 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:41,602 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:41:41,602 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 18:41:41,602 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:41,603 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:41,603 INFO L85 PathProgramCache]: Analyzing trace with hash -652196159, now seen corresponding path program 1 times [2023-08-26 18:41:41,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:41,604 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747496478] [2023-08-26 18:41:41,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:41,605 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:41,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:41,655 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:41,655 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:41,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747496478] [2023-08-26 18:41:41,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747496478] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:41:41,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963102852] [2023-08-26 18:41:41,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:41,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:41,656 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:41:41,657 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 18:41:41,659 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 18:41:41,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:41,731 INFO L262 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:41:41,732 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:41:41,757 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:41,757 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:41:41,794 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:41,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963102852] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:41:41,795 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:41:41,795 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-08-26 18:41:41,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454515913] [2023-08-26 18:41:41,795 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:41:41,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-08-26 18:41:41,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:41,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-08-26 18:41:41,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2023-08-26 18:41:41,799 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 116 out of 260 [2023-08-26 18:41:41,800 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 52 places, 47 transitions, 149 flow. Second operand has 9 states, 9 states have (on average 118.88888888888889) internal successors, (1070), 9 states have internal predecessors, (1070), 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 18:41:41,800 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:41,800 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 116 of 260 [2023-08-26 18:41:41,800 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:41,912 INFO L124 PetriNetUnfolderBase]: 326/627 cut-off events. [2023-08-26 18:41:41,912 INFO L125 PetriNetUnfolderBase]: For 162/162 co-relation queries the response was YES. [2023-08-26 18:41:41,913 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1374 conditions, 627 events. 326/627 cut-off events. For 162/162 co-relation queries the response was YES. Maximal size of possible extension queue 34. Compared 2872 event pairs, 111 based on Foata normal form. 73/690 useless extension candidates. Maximal degree in co-relation 1367. Up to 398 conditions per place. [2023-08-26 18:41:41,914 INFO L140 encePairwiseOnDemand]: 257/260 looper letters, 0 selfloop transitions, 0 changer transitions 54/54 dead transitions. [2023-08-26 18:41:41,914 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 54 transitions, 231 flow [2023-08-26 18:41:41,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 18:41:41,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 18:41:41,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 623 transitions. [2023-08-26 18:41:41,916 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47923076923076924 [2023-08-26 18:41:41,916 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 623 transitions. [2023-08-26 18:41:41,916 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 623 transitions. [2023-08-26 18:41:41,917 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:41,917 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 623 transitions. [2023-08-26 18:41:41,918 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 124.6) internal successors, (623), 5 states have internal predecessors, (623), 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 18:41:41,920 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 260.0) internal successors, (1560), 6 states have internal predecessors, (1560), 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 18:41:41,920 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 260.0) internal successors, (1560), 6 states have internal predecessors, (1560), 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 18:41:41,920 INFO L175 Difference]: Start difference. First operand has 52 places, 47 transitions, 149 flow. Second operand 5 states and 623 transitions. [2023-08-26 18:41:41,920 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 54 transitions, 231 flow [2023-08-26 18:41:41,921 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 44 places, 54 transitions, 230 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:41:41,921 INFO L231 Difference]: Finished difference. Result has 44 places, 0 transitions, 0 flow [2023-08-26 18:41:41,921 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=260, PETRI_DIFFERENCE_MINUEND_FLOW=90, PETRI_DIFFERENCE_MINUEND_PLACES=40, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=44, PETRI_TRANSITIONS=0} [2023-08-26 18:41:41,922 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, -6 predicate places. [2023-08-26 18:41:41,922 INFO L495 AbstractCegarLoop]: Abstraction has has 44 places, 0 transitions, 0 flow [2023-08-26 18:41:41,923 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 118.88888888888889) internal successors, (1070), 9 states have internal predecessors, (1070), 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 18:41:41,923 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:41:41,923 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:41:41,923 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:41:41,923 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:41:41,923 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:41:41,931 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 18:41:42,128 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:42,128 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2023-08-26 18:41:42,129 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:41:42,130 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 133 places, 148 transitions, 314 flow [2023-08-26 18:41:42,150 INFO L124 PetriNetUnfolderBase]: 34/261 cut-off events. [2023-08-26 18:41:42,150 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:41:42,152 INFO L83 FinitePrefix]: Finished finitePrefix Result has 275 conditions, 261 events. 34/261 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 778 event pairs, 0 based on Foata normal form. 0/206 useless extension candidates. Maximal degree in co-relation 163. Up to 8 conditions per place. [2023-08-26 18:41:42,152 INFO L82 GeneralOperation]: Start removeDead. Operand has 133 places, 148 transitions, 314 flow [2023-08-26 18:41:42,153 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 133 places, 148 transitions, 314 flow [2023-08-26 18:41:42,153 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:42,153 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 133 places, 148 transitions, 314 flow [2023-08-26 18:41:42,153 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 133 places, 148 transitions, 314 flow [2023-08-26 18:41:42,154 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 133 places, 148 transitions, 314 flow [2023-08-26 18:41:42,170 INFO L124 PetriNetUnfolderBase]: 34/261 cut-off events. [2023-08-26 18:41:42,171 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:41:42,172 INFO L83 FinitePrefix]: Finished finitePrefix Result has 275 conditions, 261 events. 34/261 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 778 event pairs, 0 based on Foata normal form. 0/206 useless extension candidates. Maximal degree in co-relation 163. Up to 8 conditions per place. [2023-08-26 18:41:42,176 INFO L119 LiptonReduction]: Number of co-enabled transitions 7672 [2023-08-26 18:41:44,583 INFO L134 LiptonReduction]: Checked pairs total: 18112 [2023-08-26 18:41:44,584 INFO L136 LiptonReduction]: Total number of compositions: 112 [2023-08-26 18:41:44,585 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:41:44,585 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;@26fdd7c2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:41:44,586 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:41:44,590 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:41:44,591 INFO L124 PetriNetUnfolderBase]: 14/71 cut-off events. [2023-08-26 18:41:44,591 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 18:41:44,591 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:44,591 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 18:41:44,591 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:41:44,591 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:44,591 INFO L85 PathProgramCache]: Analyzing trace with hash 656575478, now seen corresponding path program 1 times [2023-08-26 18:41:44,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:44,592 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356340435] [2023-08-26 18:41:44,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:44,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:44,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:41:44,603 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:41:44,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:41:44,613 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:41:44,613 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:41:44,614 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:41:44,614 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-08-26 18:41:44,614 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:41:44,614 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:41:44,615 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:41:44,615 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 18:41:44,629 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 18:41:44,631 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 178 transitions, 386 flow [2023-08-26 18:41:44,658 INFO L124 PetriNetUnfolderBase]: 54/398 cut-off events. [2023-08-26 18:41:44,658 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:41:44,661 INFO L83 FinitePrefix]: Finished finitePrefix Result has 426 conditions, 398 events. 54/398 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1364 event pairs, 1 based on Foata normal form. 0/312 useless extension candidates. Maximal degree in co-relation 269. Up to 16 conditions per place. [2023-08-26 18:41:44,661 INFO L82 GeneralOperation]: Start removeDead. Operand has 158 places, 178 transitions, 386 flow [2023-08-26 18:41:44,663 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 158 places, 178 transitions, 386 flow [2023-08-26 18:41:44,663 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:44,663 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 158 places, 178 transitions, 386 flow [2023-08-26 18:41:44,664 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 158 places, 178 transitions, 386 flow [2023-08-26 18:41:44,664 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 178 transitions, 386 flow [2023-08-26 18:41:44,691 INFO L124 PetriNetUnfolderBase]: 54/398 cut-off events. [2023-08-26 18:41:44,691 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:41:44,694 INFO L83 FinitePrefix]: Finished finitePrefix Result has 426 conditions, 398 events. 54/398 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1364 event pairs, 1 based on Foata normal form. 0/312 useless extension candidates. Maximal degree in co-relation 269. Up to 16 conditions per place. [2023-08-26 18:41:44,704 INFO L119 LiptonReduction]: Number of co-enabled transitions 14112 [2023-08-26 18:41:47,010 INFO L134 LiptonReduction]: Checked pairs total: 36428 [2023-08-26 18:41:47,010 INFO L136 LiptonReduction]: Total number of compositions: 127 [2023-08-26 18:41:47,012 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:41:47,012 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;@26fdd7c2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:41:47,012 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:41:47,013 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:41:47,013 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:41:47,013 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:41:47,013 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:47,013 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:47,013 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:47,014 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:47,014 INFO L85 PathProgramCache]: Analyzing trace with hash 41439, now seen corresponding path program 1 times [2023-08-26 18:41:47,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:47,014 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391797666] [2023-08-26 18:41:47,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:47,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:47,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:47,057 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:47,057 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:47,057 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391797666] [2023-08-26 18:41:47,057 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391797666] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:47,058 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:47,058 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:47,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258510361] [2023-08-26 18:41:47,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:47,058 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:47,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:47,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:47,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:47,059 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 127 out of 305 [2023-08-26 18:41:47,059 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 80 transitions, 190 flow. Second operand has 3 states, 3 states have (on average 127.66666666666667) internal successors, (383), 3 states have internal predecessors, (383), 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 18:41:47,059 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:47,059 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 127 of 305 [2023-08-26 18:41:47,060 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:50,169 INFO L124 PetriNetUnfolderBase]: 34903/51887 cut-off events. [2023-08-26 18:41:50,169 INFO L125 PetriNetUnfolderBase]: For 1017/1017 co-relation queries the response was YES. [2023-08-26 18:41:50,266 INFO L83 FinitePrefix]: Finished finitePrefix Result has 101776 conditions, 51887 events. 34903/51887 cut-off events. For 1017/1017 co-relation queries the response was YES. Maximal size of possible extension queue 1401. Compared 368125 event pairs, 33267 based on Foata normal form. 11197/55546 useless extension candidates. Maximal degree in co-relation 39812. Up to 49175 conditions per place. [2023-08-26 18:41:50,545 INFO L140 encePairwiseOnDemand]: 280/305 looper letters, 54 selfloop transitions, 2 changer transitions 3/70 dead transitions. [2023-08-26 18:41:50,546 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 70 transitions, 286 flow [2023-08-26 18:41:50,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:50,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:50,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 468 transitions. [2023-08-26 18:41:50,548 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5114754098360655 [2023-08-26 18:41:50,548 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 468 transitions. [2023-08-26 18:41:50,548 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 468 transitions. [2023-08-26 18:41:50,548 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:50,548 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 468 transitions. [2023-08-26 18:41:50,549 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 156.0) internal successors, (468), 3 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:50,551 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 305.0) internal successors, (1220), 4 states have internal predecessors, (1220), 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 18:41:50,551 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 305.0) internal successors, (1220), 4 states have internal predecessors, (1220), 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 18:41:50,551 INFO L175 Difference]: Start difference. First operand has 63 places, 80 transitions, 190 flow. Second operand 3 states and 468 transitions. [2023-08-26 18:41:50,551 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 70 transitions, 286 flow [2023-08-26 18:41:50,554 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 65 places, 70 transitions, 286 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:41:50,555 INFO L231 Difference]: Finished difference. Result has 66 places, 57 transitions, 150 flow [2023-08-26 18:41:50,555 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=305, PETRI_DIFFERENCE_MINUEND_FLOW=148, PETRI_DIFFERENCE_MINUEND_PLACES=63, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=150, PETRI_PLACES=66, PETRI_TRANSITIONS=57} [2023-08-26 18:41:50,556 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, 3 predicate places. [2023-08-26 18:41:50,556 INFO L495 AbstractCegarLoop]: Abstraction has has 66 places, 57 transitions, 150 flow [2023-08-26 18:41:50,557 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 127.66666666666667) internal successors, (383), 3 states have internal predecessors, (383), 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 18:41:50,557 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:50,557 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:50,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 18:41:50,557 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:50,560 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:50,560 INFO L85 PathProgramCache]: Analyzing trace with hash 41437, now seen corresponding path program 1 times [2023-08-26 18:41:50,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:50,560 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968471899] [2023-08-26 18:41:50,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:50,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:50,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:50,594 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:50,595 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:50,595 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968471899] [2023-08-26 18:41:50,595 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1968471899] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:50,595 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:50,595 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:50,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999714684] [2023-08-26 18:41:50,597 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:50,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:50,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:50,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:50,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:50,598 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 132 out of 305 [2023-08-26 18:41:50,599 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 66 places, 57 transitions, 150 flow. Second operand has 3 states, 3 states have (on average 132.66666666666666) internal successors, (398), 3 states have internal predecessors, (398), 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 18:41:50,599 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:50,599 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 132 of 305 [2023-08-26 18:41:50,599 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:52,769 INFO L124 PetriNetUnfolderBase]: 25911/38609 cut-off events. [2023-08-26 18:41:52,769 INFO L125 PetriNetUnfolderBase]: For 2589/2589 co-relation queries the response was YES. [2023-08-26 18:41:52,820 INFO L83 FinitePrefix]: Finished finitePrefix Result has 78291 conditions, 38609 events. 25911/38609 cut-off events. For 2589/2589 co-relation queries the response was YES. Maximal size of possible extension queue 1068. Compared 264946 event pairs, 25801 based on Foata normal form. 0/35561 useless extension candidates. Maximal degree in co-relation 78219. Up to 36555 conditions per place. [2023-08-26 18:41:52,954 INFO L140 encePairwiseOnDemand]: 302/305 looper letters, 43 selfloop transitions, 1 changer transitions 0/55 dead transitions. [2023-08-26 18:41:52,954 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 55 transitions, 234 flow [2023-08-26 18:41:52,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:52,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:52,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 441 transitions. [2023-08-26 18:41:52,956 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4819672131147541 [2023-08-26 18:41:52,956 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 441 transitions. [2023-08-26 18:41:52,956 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 441 transitions. [2023-08-26 18:41:52,956 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:52,956 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 441 transitions. [2023-08-26 18:41:52,958 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 147.0) internal successors, (441), 3 states have internal predecessors, (441), 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 18:41:52,959 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 305.0) internal successors, (1220), 4 states have internal predecessors, (1220), 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 18:41:52,960 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 305.0) internal successors, (1220), 4 states have internal predecessors, (1220), 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 18:41:52,960 INFO L175 Difference]: Start difference. First operand has 66 places, 57 transitions, 150 flow. Second operand 3 states and 441 transitions. [2023-08-26 18:41:52,960 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 55 transitions, 234 flow [2023-08-26 18:41:52,970 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 55 transitions, 230 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:41:52,971 INFO L231 Difference]: Finished difference. Result has 61 places, 55 transitions, 144 flow [2023-08-26 18:41:52,971 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=305, PETRI_DIFFERENCE_MINUEND_FLOW=142, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=55, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=54, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=144, PETRI_PLACES=61, PETRI_TRANSITIONS=55} [2023-08-26 18:41:52,971 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, -2 predicate places. [2023-08-26 18:41:52,971 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 55 transitions, 144 flow [2023-08-26 18:41:52,972 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 132.66666666666666) internal successors, (398), 3 states have internal predecessors, (398), 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 18:41:52,972 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:52,972 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:41:52,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 18:41:52,972 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:52,972 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:52,972 INFO L85 PathProgramCache]: Analyzing trace with hash -351052228, now seen corresponding path program 1 times [2023-08-26 18:41:52,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:52,973 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769129327] [2023-08-26 18:41:52,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:52,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:52,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:53,050 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:53,050 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:53,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769129327] [2023-08-26 18:41:53,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769129327] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:41:53,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019675866] [2023-08-26 18:41:53,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:53,050 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:53,051 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:41:53,052 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 18:41:53,054 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 18:41:53,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:53,119 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:41:53,120 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:41:53,132 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:41:53,177 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:53,177 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:41:53,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:53,218 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019675866] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:41:53,219 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:41:53,219 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:41:53,219 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16178198] [2023-08-26 18:41:53,219 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:41:53,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:41:53,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:53,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:41:53,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:41:53,221 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 127 out of 305 [2023-08-26 18:41:53,223 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 55 transitions, 144 flow. Second operand has 8 states, 8 states have (on average 128.875) internal successors, (1031), 8 states have internal predecessors, (1031), 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 18:41:53,224 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:53,224 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 127 of 305 [2023-08-26 18:41:53,224 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:53,856 INFO L124 PetriNetUnfolderBase]: 5560/8248 cut-off events. [2023-08-26 18:41:53,856 INFO L125 PetriNetUnfolderBase]: For 1296/1296 co-relation queries the response was YES. [2023-08-26 18:41:53,865 INFO L83 FinitePrefix]: Finished finitePrefix Result has 17367 conditions, 8248 events. 5560/8248 cut-off events. For 1296/1296 co-relation queries the response was YES. Maximal size of possible extension queue 273. Compared 47449 event pairs, 630 based on Foata normal form. 819/9048 useless extension candidates. Maximal degree in co-relation 17356. Up to 5346 conditions per place. [2023-08-26 18:41:53,871 INFO L140 encePairwiseOnDemand]: 301/305 looper letters, 0 selfloop transitions, 0 changer transitions 93/93 dead transitions. [2023-08-26 18:41:53,871 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 93 transitions, 376 flow [2023-08-26 18:41:53,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:41:53,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:41:53,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 851 transitions. [2023-08-26 18:41:53,875 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46502732240437156 [2023-08-26 18:41:53,875 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 851 transitions. [2023-08-26 18:41:53,875 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 851 transitions. [2023-08-26 18:41:53,876 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:53,876 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 851 transitions. [2023-08-26 18:41:53,879 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 141.83333333333334) internal successors, (851), 6 states have internal predecessors, (851), 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 18:41:53,881 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 305.0) internal successors, (2135), 7 states have internal predecessors, (2135), 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 18:41:53,882 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 305.0) internal successors, (2135), 7 states have internal predecessors, (2135), 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 18:41:53,882 INFO L175 Difference]: Start difference. First operand has 61 places, 55 transitions, 144 flow. Second operand 6 states and 851 transitions. [2023-08-26 18:41:53,882 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 93 transitions, 376 flow [2023-08-26 18:41:53,883 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 93 transitions, 373 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-26 18:41:53,884 INFO L231 Difference]: Finished difference. Result has 54 places, 0 transitions, 0 flow [2023-08-26 18:41:53,884 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=305, PETRI_DIFFERENCE_MINUEND_FLOW=101, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=41, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=54, PETRI_TRANSITIONS=0} [2023-08-26 18:41:53,884 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, -9 predicate places. [2023-08-26 18:41:53,884 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 0 transitions, 0 flow [2023-08-26 18:41:53,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 128.875) internal successors, (1031), 8 states have internal predecessors, (1031), 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 18:41:53,885 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:41:53,885 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:41:53,885 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:41:53,885 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:41:53,885 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:41:53,893 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-08-26 18:41:54,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:54,090 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-26 18:41:54,091 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:41:54,092 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 178 transitions, 386 flow [2023-08-26 18:41:54,120 INFO L124 PetriNetUnfolderBase]: 54/398 cut-off events. [2023-08-26 18:41:54,120 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:41:54,122 INFO L83 FinitePrefix]: Finished finitePrefix Result has 426 conditions, 398 events. 54/398 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1364 event pairs, 1 based on Foata normal form. 0/312 useless extension candidates. Maximal degree in co-relation 269. Up to 16 conditions per place. [2023-08-26 18:41:54,123 INFO L82 GeneralOperation]: Start removeDead. Operand has 158 places, 178 transitions, 386 flow [2023-08-26 18:41:54,124 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 158 places, 178 transitions, 386 flow [2023-08-26 18:41:54,124 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:54,124 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 158 places, 178 transitions, 386 flow [2023-08-26 18:41:54,125 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 158 places, 178 transitions, 386 flow [2023-08-26 18:41:54,125 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 178 transitions, 386 flow [2023-08-26 18:41:54,152 INFO L124 PetriNetUnfolderBase]: 54/398 cut-off events. [2023-08-26 18:41:54,152 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:41:54,155 INFO L83 FinitePrefix]: Finished finitePrefix Result has 426 conditions, 398 events. 54/398 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1364 event pairs, 1 based on Foata normal form. 0/312 useless extension candidates. Maximal degree in co-relation 269. Up to 16 conditions per place. [2023-08-26 18:41:54,163 INFO L119 LiptonReduction]: Number of co-enabled transitions 14112 [2023-08-26 18:41:56,505 INFO L134 LiptonReduction]: Checked pairs total: 36371 [2023-08-26 18:41:56,506 INFO L136 LiptonReduction]: Total number of compositions: 127 [2023-08-26 18:41:56,507 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:41:56,507 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;@26fdd7c2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:41:56,507 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:41:56,513 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:41:56,513 INFO L124 PetriNetUnfolderBase]: 24/112 cut-off events. [2023-08-26 18:41:56,513 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 18:41:56,513 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:56,513 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 18:41:56,514 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:41:56,514 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:56,514 INFO L85 PathProgramCache]: Analyzing trace with hash 892460370, now seen corresponding path program 1 times [2023-08-26 18:41:56,514 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:56,514 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104418500] [2023-08-26 18:41:56,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:56,514 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:56,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:41:56,529 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:41:56,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:41:56,552 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:41:56,552 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:41:56,552 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:41:56,552 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-26 18:41:56,553 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:41:56,554 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:41:56,555 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:41:56,555 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 18:41:56,579 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 18:41:56,583 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 183 places, 208 transitions, 460 flow [2023-08-26 18:41:56,636 INFO L124 PetriNetUnfolderBase]: 86/611 cut-off events. [2023-08-26 18:41:56,636 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:41:56,642 INFO L83 FinitePrefix]: Finished finitePrefix Result has 666 conditions, 611 events. 86/611 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2437 event pairs, 6 based on Foata normal form. 0/478 useless extension candidates. Maximal degree in co-relation 418. Up to 32 conditions per place. [2023-08-26 18:41:56,642 INFO L82 GeneralOperation]: Start removeDead. Operand has 183 places, 208 transitions, 460 flow [2023-08-26 18:41:56,648 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 183 places, 208 transitions, 460 flow [2023-08-26 18:41:56,649 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:56,649 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 183 places, 208 transitions, 460 flow [2023-08-26 18:41:56,649 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 183 places, 208 transitions, 460 flow [2023-08-26 18:41:56,649 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 183 places, 208 transitions, 460 flow [2023-08-26 18:41:56,704 INFO L124 PetriNetUnfolderBase]: 86/611 cut-off events. [2023-08-26 18:41:56,704 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:41:56,709 INFO L83 FinitePrefix]: Finished finitePrefix Result has 666 conditions, 611 events. 86/611 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2437 event pairs, 6 based on Foata normal form. 0/478 useless extension candidates. Maximal degree in co-relation 418. Up to 32 conditions per place. [2023-08-26 18:41:56,722 INFO L119 LiptonReduction]: Number of co-enabled transitions 22288 [2023-08-26 18:41:59,277 INFO L134 LiptonReduction]: Checked pairs total: 61475 [2023-08-26 18:41:59,277 INFO L136 LiptonReduction]: Total number of compositions: 142 [2023-08-26 18:41:59,279 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:41:59,279 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;@26fdd7c2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:41:59,279 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:41:59,280 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:41:59,280 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:41:59,280 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:41:59,280 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:59,281 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:59,281 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:59,281 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:59,281 INFO L85 PathProgramCache]: Analyzing trace with hash 57666, now seen corresponding path program 1 times [2023-08-26 18:41:59,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:59,281 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190635092] [2023-08-26 18:41:59,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:59,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:59,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:59,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:59,308 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:59,308 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190635092] [2023-08-26 18:41:59,308 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190635092] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:59,308 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:59,308 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:59,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951883817] [2023-08-26 18:41:59,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:59,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:59,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:59,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:59,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:59,310 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 154 out of 350 [2023-08-26 18:41:59,310 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 78 places, 101 transitions, 246 flow. Second operand has 3 states, 3 states have (on average 154.66666666666666) internal successors, (464), 3 states have internal predecessors, (464), 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 18:41:59,310 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:59,310 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 154 of 350 [2023-08-26 18:41:59,310 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:42:24,006 INFO L124 PetriNetUnfolderBase]: 271023/375828 cut-off events. [2023-08-26 18:42:24,007 INFO L125 PetriNetUnfolderBase]: For 12213/12213 co-relation queries the response was YES. [2023-08-26 18:42:24,669 INFO L83 FinitePrefix]: Finished finitePrefix Result has 737397 conditions, 375828 events. 271023/375828 cut-off events. For 12213/12213 co-relation queries the response was YES. Maximal size of possible extension queue 8528. Compared 2974774 event pairs, 247361 based on Foata normal form. 69698/407305 useless extension candidates. Maximal degree in co-relation 71084. Up to 324662 conditions per place. [2023-08-26 18:42:25,755 INFO L140 encePairwiseOnDemand]: 318/350 looper letters, 49 selfloop transitions, 1 changer transitions 32/99 dead transitions. [2023-08-26 18:42:25,755 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 77 places, 99 transitions, 404 flow [2023-08-26 18:42:25,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:42:25,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:42:25,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 597 transitions. [2023-08-26 18:42:25,757 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5685714285714286 [2023-08-26 18:42:25,758 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 597 transitions. [2023-08-26 18:42:25,758 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 597 transitions. [2023-08-26 18:42:25,758 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:42:25,758 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 597 transitions. [2023-08-26 18:42:25,759 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 199.0) internal successors, (597), 3 states have internal predecessors, (597), 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 18:42:25,761 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 350.0) internal successors, (1400), 4 states have internal predecessors, (1400), 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 18:42:25,761 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 350.0) internal successors, (1400), 4 states have internal predecessors, (1400), 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 18:42:25,761 INFO L175 Difference]: Start difference. First operand has 78 places, 101 transitions, 246 flow. Second operand 3 states and 597 transitions. [2023-08-26 18:42:25,761 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 77 places, 99 transitions, 404 flow [2023-08-26 18:42:25,764 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 77 places, 99 transitions, 404 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:42:25,766 INFO L231 Difference]: Finished difference. Result has 77 places, 67 transitions, 172 flow [2023-08-26 18:42:25,766 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=350, PETRI_DIFFERENCE_MINUEND_FLOW=184, PETRI_DIFFERENCE_MINUEND_PLACES=75, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=69, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=172, PETRI_PLACES=77, PETRI_TRANSITIONS=67} [2023-08-26 18:42:25,766 INFO L281 CegarLoopForPetriNet]: 78 programPoint places, -1 predicate places. [2023-08-26 18:42:25,766 INFO L495 AbstractCegarLoop]: Abstraction has has 77 places, 67 transitions, 172 flow [2023-08-26 18:42:25,767 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 154.66666666666666) internal successors, (464), 3 states have internal predecessors, (464), 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 18:42:25,767 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:42:25,767 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:42:25,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-08-26 18:42:25,767 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:42:25,767 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:42:25,767 INFO L85 PathProgramCache]: Analyzing trace with hash 57667, now seen corresponding path program 1 times [2023-08-26 18:42:25,767 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:42:25,768 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444523606] [2023-08-26 18:42:25,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:42:25,768 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:42:25,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:42:25,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:42:25,805 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:42:25,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444523606] [2023-08-26 18:42:25,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444523606] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:42:25,806 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:42:25,806 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:42:25,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151623575] [2023-08-26 18:42:25,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:42:25,806 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:42:25,806 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:42:25,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:42:25,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:42:25,808 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 149 out of 350 [2023-08-26 18:42:25,808 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 77 places, 67 transitions, 172 flow. Second operand has 3 states, 3 states have (on average 149.66666666666666) internal successors, (449), 3 states have internal predecessors, (449), 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 18:42:25,808 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:42:25,808 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 149 of 350 [2023-08-26 18:42:25,808 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:42:44,744 INFO L124 PetriNetUnfolderBase]: 230525/320549 cut-off events. [2023-08-26 18:42:44,745 INFO L125 PetriNetUnfolderBase]: For 10944/10944 co-relation queries the response was YES. [2023-08-26 18:42:45,312 INFO L83 FinitePrefix]: Finished finitePrefix Result has 628365 conditions, 320549 events. 230525/320549 cut-off events. For 10944/10944 co-relation queries the response was YES. Maximal size of possible extension queue 7286. Compared 2501064 event pairs, 187184 based on Foata normal form. 0/294947 useless extension candidates. Maximal degree in co-relation 628355. Up to 301798 conditions per place. [2023-08-26 18:42:46,212 INFO L140 encePairwiseOnDemand]: 346/350 looper letters, 57 selfloop transitions, 2 changer transitions 0/76 dead transitions. [2023-08-26 18:42:46,212 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 76 places, 76 transitions, 308 flow [2023-08-26 18:42:46,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:42:46,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:42:46,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 508 transitions. [2023-08-26 18:42:46,214 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4838095238095238 [2023-08-26 18:42:46,214 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 508 transitions. [2023-08-26 18:42:46,214 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 508 transitions. [2023-08-26 18:42:46,214 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:42:46,214 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 508 transitions. [2023-08-26 18:42:46,215 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 169.33333333333334) internal successors, (508), 3 states have internal predecessors, (508), 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 18:42:46,216 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 350.0) internal successors, (1400), 4 states have internal predecessors, (1400), 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 18:42:46,217 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 350.0) internal successors, (1400), 4 states have internal predecessors, (1400), 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 18:42:46,217 INFO L175 Difference]: Start difference. First operand has 77 places, 67 transitions, 172 flow. Second operand 3 states and 508 transitions. [2023-08-26 18:42:46,217 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 76 places, 76 transitions, 308 flow [2023-08-26 18:42:46,255 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 76 transitions, 305 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:42:46,256 INFO L231 Difference]: Finished difference. Result has 75 places, 68 transitions, 183 flow [2023-08-26 18:42:46,256 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=350, PETRI_DIFFERENCE_MINUEND_FLOW=169, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=67, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=65, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=183, PETRI_PLACES=75, PETRI_TRANSITIONS=68} [2023-08-26 18:42:46,257 INFO L281 CegarLoopForPetriNet]: 78 programPoint places, -3 predicate places. [2023-08-26 18:42:46,257 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 68 transitions, 183 flow [2023-08-26 18:42:46,257 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 149.66666666666666) internal successors, (449), 3 states have internal predecessors, (449), 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 18:42:46,257 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:42:46,257 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:42:46,257 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-26 18:42:46,257 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:42:46,258 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:42:46,258 INFO L85 PathProgramCache]: Analyzing trace with hash 1765078734, now seen corresponding path program 1 times [2023-08-26 18:42:46,258 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:42:46,258 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830305062] [2023-08-26 18:42:46,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:42:46,258 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:42:46,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:42:46,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:42:46,313 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:42:46,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830305062] [2023-08-26 18:42:46,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830305062] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:42:46,314 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538381581] [2023-08-26 18:42:46,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:42:46,314 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:42:46,314 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:42:46,315 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 18:42:46,321 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 18:42:46,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:42:46,390 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:42:46,391 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:42:46,399 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:42:46,426 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:42:46,426 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:42:46,457 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:42:46,458 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538381581] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:42:46,458 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:42:46,458 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-08-26 18:42:46,458 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542296854] [2023-08-26 18:42:46,458 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:42:46,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 18:42:46,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:42:46,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 18:42:46,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-08-26 18:42:46,462 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 149 out of 350 [2023-08-26 18:42:46,463 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 68 transitions, 183 flow. Second operand has 7 states, 7 states have (on average 150.71428571428572) internal successors, (1055), 7 states have internal predecessors, (1055), 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 18:42:46,463 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:42:46,463 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 149 of 350 [2023-08-26 18:42:46,463 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:43:04,495 INFO L124 PetriNetUnfolderBase]: 229019/311287 cut-off events. [2023-08-26 18:43:04,495 INFO L125 PetriNetUnfolderBase]: For 16852/16852 co-relation queries the response was YES. [2023-08-26 18:43:05,177 INFO L83 FinitePrefix]: Finished finitePrefix Result has 631455 conditions, 311287 events. 229019/311287 cut-off events. For 16852/16852 co-relation queries the response was YES. Maximal size of possible extension queue 7182. Compared 2344258 event pairs, 39105 based on Foata normal form. 8/294076 useless extension candidates. Maximal degree in co-relation 631443. Up to 256542 conditions per place. [2023-08-26 18:43:06,331 INFO L140 encePairwiseOnDemand]: 345/350 looper letters, 122 selfloop transitions, 7 changer transitions 1/147 dead transitions. [2023-08-26 18:43:06,331 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 147 transitions, 609 flow [2023-08-26 18:43:06,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:43:06,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:43:06,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1028 transitions. [2023-08-26 18:43:06,334 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4895238095238095 [2023-08-26 18:43:06,334 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1028 transitions. [2023-08-26 18:43:06,334 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1028 transitions. [2023-08-26 18:43:06,334 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:43:06,334 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1028 transitions. [2023-08-26 18:43:06,336 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 171.33333333333334) internal successors, (1028), 6 states have internal predecessors, (1028), 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 18:43:06,339 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 350.0) internal successors, (2450), 7 states have internal predecessors, (2450), 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 18:43:06,340 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 350.0) internal successors, (2450), 7 states have internal predecessors, (2450), 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 18:43:06,340 INFO L175 Difference]: Start difference. First operand has 75 places, 68 transitions, 183 flow. Second operand 6 states and 1028 transitions. [2023-08-26 18:43:06,340 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 80 places, 147 transitions, 609 flow [2023-08-26 18:43:06,343 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 147 transitions, 607 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:43:06,344 INFO L231 Difference]: Finished difference. Result has 83 places, 72 transitions, 233 flow [2023-08-26 18:43:06,344 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=350, PETRI_DIFFERENCE_MINUEND_FLOW=181, PETRI_DIFFERENCE_MINUEND_PLACES=74, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=68, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=64, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=233, PETRI_PLACES=83, PETRI_TRANSITIONS=72} [2023-08-26 18:43:06,345 INFO L281 CegarLoopForPetriNet]: 78 programPoint places, 5 predicate places. [2023-08-26 18:43:06,345 INFO L495 AbstractCegarLoop]: Abstraction has has 83 places, 72 transitions, 233 flow [2023-08-26 18:43:06,345 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 150.71428571428572) internal successors, (1055), 7 states have internal predecessors, (1055), 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 18:43:06,345 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:43:06,345 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 18:43:06,353 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 18:43:06,550 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,SelfDestructingSolverStorable17 [2023-08-26 18:43:06,550 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:43:06,550 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:43:06,550 INFO L85 PathProgramCache]: Analyzing trace with hash 1067113285, now seen corresponding path program 1 times [2023-08-26 18:43:06,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:43:06,551 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159256990] [2023-08-26 18:43:06,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:43:06,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:43:06,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:43:06,592 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 18:43:06,592 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:43:06,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159256990] [2023-08-26 18:43:06,593 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159256990] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:43:06,593 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:43:06,593 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:43:06,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123717718] [2023-08-26 18:43:06,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:43:06,595 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:43:06,604 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:43:06,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:43:06,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:43:06,605 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 151 out of 350 [2023-08-26 18:43:06,605 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 83 places, 72 transitions, 233 flow. Second operand has 3 states, 3 states have (on average 153.66666666666666) internal successors, (461), 3 states have internal predecessors, (461), 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 18:43:06,605 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:43:06,605 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 151 of 350 [2023-08-26 18:43:06,606 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:43:46,159 INFO L124 PetriNetUnfolderBase]: 501874/670602 cut-off events. [2023-08-26 18:43:46,160 INFO L125 PetriNetUnfolderBase]: For 245929/245929 co-relation queries the response was YES. [2023-08-26 18:43:48,001 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1440915 conditions, 670602 events. 501874/670602 cut-off events. For 245929/245929 co-relation queries the response was YES. Maximal size of possible extension queue 11928. Compared 4838546 event pairs, 241187 based on Foata normal form. 0/642334 useless extension candidates. Maximal degree in co-relation 1440898. Up to 644826 conditions per place. [2023-08-26 18:43:50,258 INFO L140 encePairwiseOnDemand]: 344/350 looper letters, 90 selfloop transitions, 5 changer transitions 0/104 dead transitions. [2023-08-26 18:43:50,258 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 85 places, 104 transitions, 556 flow [2023-08-26 18:43:50,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:43:50,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:43:50,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 539 transitions. [2023-08-26 18:43:50,260 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5133333333333333 [2023-08-26 18:43:50,260 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 539 transitions. [2023-08-26 18:43:50,260 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 539 transitions. [2023-08-26 18:43:50,261 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:43:50,261 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 539 transitions. [2023-08-26 18:43:50,262 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 179.66666666666666) internal successors, (539), 3 states have internal predecessors, (539), 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 18:43:50,263 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 350.0) internal successors, (1400), 4 states have internal predecessors, (1400), 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 18:43:50,264 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 350.0) internal successors, (1400), 4 states have internal predecessors, (1400), 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 18:43:50,264 INFO L175 Difference]: Start difference. First operand has 83 places, 72 transitions, 233 flow. Second operand 3 states and 539 transitions. [2023-08-26 18:43:50,264 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 85 places, 104 transitions, 556 flow [2023-08-26 18:43:50,366 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 83 places, 104 transitions, 530 flow, removed 10 selfloop flow, removed 2 redundant places. [2023-08-26 18:43:50,367 INFO L231 Difference]: Finished difference. Result has 84 places, 76 transitions, 252 flow [2023-08-26 18:43:50,367 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=350, PETRI_DIFFERENCE_MINUEND_FLOW=219, PETRI_DIFFERENCE_MINUEND_PLACES=81, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=72, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=67, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=252, PETRI_PLACES=84, PETRI_TRANSITIONS=76} [2023-08-26 18:43:50,367 INFO L281 CegarLoopForPetriNet]: 78 programPoint places, 6 predicate places. [2023-08-26 18:43:50,367 INFO L495 AbstractCegarLoop]: Abstraction has has 84 places, 76 transitions, 252 flow [2023-08-26 18:43:50,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 153.66666666666666) internal successors, (461), 3 states have internal predecessors, (461), 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 18:43:50,368 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:43:50,368 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:43:50,368 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-08-26 18:43:50,368 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:43:50,368 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:43:50,368 INFO L85 PathProgramCache]: Analyzing trace with hash -978340487, now seen corresponding path program 1 times [2023-08-26 18:43:50,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:43:50,368 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555448303] [2023-08-26 18:43:50,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:43:50,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:43:50,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:43:50,449 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-08-26 18:43:50,449 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:43:50,449 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555448303] [2023-08-26 18:43:50,450 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555448303] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:43:50,450 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1424436962] [2023-08-26 18:43:50,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:43:50,450 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:43:50,450 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:43:50,451 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 18:43:50,461 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 18:43:50,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:43:50,526 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:43:50,527 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:43:50,552 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:43:50,552 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:43:50,579 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:43:50,579 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1424436962] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:43:50,579 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:43:50,579 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 11 [2023-08-26 18:43:50,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207355177] [2023-08-26 18:43:50,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:43:50,579 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-08-26 18:43:50,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:43:50,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-08-26 18:43:50,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2023-08-26 18:43:50,581 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 143 out of 350 [2023-08-26 18:43:50,582 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 84 places, 76 transitions, 252 flow. Second operand has 12 states, 12 states have (on average 145.83333333333334) internal successors, (1750), 12 states have internal predecessors, (1750), 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 18:43:50,582 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:43:50,582 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 143 of 350 [2023-08-26 18:43:50,582 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:43:55,411 INFO L124 PetriNetUnfolderBase]: 53660/74377 cut-off events. [2023-08-26 18:43:55,412 INFO L125 PetriNetUnfolderBase]: For 78704/78704 co-relation queries the response was YES. [2023-08-26 18:43:55,622 INFO L83 FinitePrefix]: Finished finitePrefix Result has 187302 conditions, 74377 events. 53660/74377 cut-off events. For 78704/78704 co-relation queries the response was YES. Maximal size of possible extension queue 2050. Compared 507646 event pairs, 6049 based on Foata normal form. 5748/79779 useless extension candidates. Maximal degree in co-relation 187284. Up to 46151 conditions per place. [2023-08-26 18:43:55,856 INFO L140 encePairwiseOnDemand]: 347/350 looper letters, 118 selfloop transitions, 5 changer transitions 0/140 dead transitions. [2023-08-26 18:43:55,856 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 140 transitions, 641 flow [2023-08-26 18:43:55,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 18:43:55,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 18:43:55,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1118 transitions. [2023-08-26 18:43:55,859 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4563265306122449 [2023-08-26 18:43:55,859 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1118 transitions. [2023-08-26 18:43:55,859 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1118 transitions. [2023-08-26 18:43:55,860 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:43:55,860 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1118 transitions. [2023-08-26 18:43:55,862 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 159.71428571428572) internal successors, (1118), 7 states have internal predecessors, (1118), 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 18:43:55,865 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 350.0) internal successors, (2800), 8 states have internal predecessors, (2800), 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 18:43:55,865 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 350.0) internal successors, (2800), 8 states have internal predecessors, (2800), 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 18:43:55,866 INFO L175 Difference]: Start difference. First operand has 84 places, 76 transitions, 252 flow. Second operand 7 states and 1118 transitions. [2023-08-26 18:43:55,866 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 80 places, 140 transitions, 641 flow [2023-08-26 18:43:55,884 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 78 places, 140 transitions, 621 flow, removed 3 selfloop flow, removed 2 redundant places. [2023-08-26 18:43:55,886 INFO L231 Difference]: Finished difference. Result has 78 places, 60 transitions, 193 flow [2023-08-26 18:43:55,886 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=350, PETRI_DIFFERENCE_MINUEND_FLOW=183, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=60, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=193, PETRI_PLACES=78, PETRI_TRANSITIONS=60} [2023-08-26 18:43:55,886 INFO L281 CegarLoopForPetriNet]: 78 programPoint places, 0 predicate places. [2023-08-26 18:43:55,886 INFO L495 AbstractCegarLoop]: Abstraction has has 78 places, 60 transitions, 193 flow [2023-08-26 18:43:55,887 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 145.83333333333334) internal successors, (1750), 12 states have internal predecessors, (1750), 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 18:43:55,887 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:43:55,887 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 18:43:55,896 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-08-26 18:43:56,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:43:56,092 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:43:56,093 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:43:56,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1362419031, now seen corresponding path program 1 times [2023-08-26 18:43:56,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:43:56,093 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943441303] [2023-08-26 18:43:56,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:43:56,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:43:56,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:43:56,256 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:43:56,256 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:43:56,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943441303] [2023-08-26 18:43:56,257 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943441303] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:43:56,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [914056983] [2023-08-26 18:43:56,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:43:56,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:43:56,257 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:43:56,261 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:43:56,278 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-08-26 18:43:56,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:43:56,345 INFO L262 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 15 conjunts are in the unsatisfiable core [2023-08-26 18:43:56,346 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:43:56,355 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:43:56,462 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:43:56,462 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:43:56,579 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:43:56,579 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [914056983] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:43:56,579 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:43:56,579 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 14 [2023-08-26 18:43:56,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241157468] [2023-08-26 18:43:56,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:43:56,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-08-26 18:43:56,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:43:56,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-08-26 18:43:56,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2023-08-26 18:43:56,582 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 149 out of 350 [2023-08-26 18:43:56,584 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 78 places, 60 transitions, 193 flow. Second operand has 16 states, 16 states have (on average 151.4375) internal successors, (2423), 16 states have internal predecessors, (2423), 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 18:43:56,584 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:43:56,584 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 149 of 350 [2023-08-26 18:43:56,584 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:43:59,800 INFO L124 PetriNetUnfolderBase]: 35763/50286 cut-off events. [2023-08-26 18:43:59,800 INFO L125 PetriNetUnfolderBase]: For 55678/55678 co-relation queries the response was YES. [2023-08-26 18:43:59,950 INFO L83 FinitePrefix]: Finished finitePrefix Result has 116858 conditions, 50286 events. 35763/50286 cut-off events. For 55678/55678 co-relation queries the response was YES. Maximal size of possible extension queue 1409. Compared 335771 event pairs, 2082 based on Foata normal form. 5157/55172 useless extension candidates. Maximal degree in co-relation 116840. Up to 23225 conditions per place. [2023-08-26 18:43:59,978 INFO L140 encePairwiseOnDemand]: 347/350 looper letters, 0 selfloop transitions, 0 changer transitions 139/139 dead transitions. [2023-08-26 18:43:59,978 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 83 places, 139 transitions, 619 flow [2023-08-26 18:43:59,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 18:43:59,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 18:43:59,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1157 transitions. [2023-08-26 18:43:59,981 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4722448979591837 [2023-08-26 18:43:59,981 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1157 transitions. [2023-08-26 18:43:59,981 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1157 transitions. [2023-08-26 18:43:59,982 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:43:59,982 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1157 transitions. [2023-08-26 18:43:59,985 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 165.28571428571428) internal successors, (1157), 7 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 18:43:59,987 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 350.0) internal successors, (2800), 8 states have internal predecessors, (2800), 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 18:43:59,988 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 350.0) internal successors, (2800), 8 states have internal predecessors, (2800), 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 18:43:59,988 INFO L175 Difference]: Start difference. First operand has 78 places, 60 transitions, 193 flow. Second operand 7 states and 1157 transitions. [2023-08-26 18:43:59,988 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 83 places, 139 transitions, 619 flow [2023-08-26 18:43:59,998 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 139 transitions, 602 flow, removed 0 selfloop flow, removed 9 redundant places. [2023-08-26 18:43:59,999 INFO L231 Difference]: Finished difference. Result has 74 places, 0 transitions, 0 flow [2023-08-26 18:43:59,999 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=350, PETRI_DIFFERENCE_MINUEND_FLOW=166, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=59, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=0, PETRI_PLACES=74, PETRI_TRANSITIONS=0} [2023-08-26 18:43:59,999 INFO L281 CegarLoopForPetriNet]: 78 programPoint places, -4 predicate places. [2023-08-26 18:43:59,999 INFO L495 AbstractCegarLoop]: Abstraction has has 74 places, 0 transitions, 0 flow [2023-08-26 18:44:00,000 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 151.4375) internal successors, (2423), 16 states have internal predecessors, (2423), 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 18:44:00,000 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:44:00,000 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:44:00,000 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:44:00,001 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:44:00,001 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:44:00,012 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-08-26 18:44:00,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:44:00,206 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2023-08-26 18:44:00,207 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:44:00,208 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 183 places, 208 transitions, 460 flow [2023-08-26 18:44:00,243 INFO L124 PetriNetUnfolderBase]: 86/611 cut-off events. [2023-08-26 18:44:00,243 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:44:00,248 INFO L83 FinitePrefix]: Finished finitePrefix Result has 666 conditions, 611 events. 86/611 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2437 event pairs, 6 based on Foata normal form. 0/478 useless extension candidates. Maximal degree in co-relation 418. Up to 32 conditions per place. [2023-08-26 18:44:00,248 INFO L82 GeneralOperation]: Start removeDead. Operand has 183 places, 208 transitions, 460 flow [2023-08-26 18:44:00,250 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 183 places, 208 transitions, 460 flow [2023-08-26 18:44:00,250 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:44:00,250 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 183 places, 208 transitions, 460 flow [2023-08-26 18:44:00,250 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 183 places, 208 transitions, 460 flow [2023-08-26 18:44:00,250 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 183 places, 208 transitions, 460 flow [2023-08-26 18:44:00,285 INFO L124 PetriNetUnfolderBase]: 86/611 cut-off events. [2023-08-26 18:44:00,285 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:44:00,289 INFO L83 FinitePrefix]: Finished finitePrefix Result has 666 conditions, 611 events. 86/611 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2437 event pairs, 6 based on Foata normal form. 0/478 useless extension candidates. Maximal degree in co-relation 418. Up to 32 conditions per place. [2023-08-26 18:44:00,300 INFO L119 LiptonReduction]: Number of co-enabled transitions 22288 [2023-08-26 18:44:02,988 INFO L134 LiptonReduction]: Checked pairs total: 67064 [2023-08-26 18:44:02,988 INFO L136 LiptonReduction]: Total number of compositions: 142 [2023-08-26 18:44:02,989 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:44:02,989 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;@26fdd7c2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:44:02,990 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:44:02,998 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:44:02,998 INFO L124 PetriNetUnfolderBase]: 33/156 cut-off events. [2023-08-26 18:44:02,998 INFO L125 PetriNetUnfolderBase]: For 23/23 co-relation queries the response was YES. [2023-08-26 18:44:02,998 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:44:02,998 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 18:44:02,999 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:44:02,999 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:44:02,999 INFO L85 PathProgramCache]: Analyzing trace with hash -780746580, now seen corresponding path program 1 times [2023-08-26 18:44:02,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:44:02,999 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008192329] [2023-08-26 18:44:02,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:44:02,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:44:03,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:44:03,011 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:44:03,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:44:03,022 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:44:03,022 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:44:03,022 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:44:03,022 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-08-26 18:44:03,022 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:44:03,023 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:44:03,023 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:44:03,023 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-26 18:44:03,040 INFO L144 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2023-08-26 18:44:03,042 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 208 places, 238 transitions, 536 flow [2023-08-26 18:44:03,138 INFO L124 PetriNetUnfolderBase]: 146/980 cut-off events. [2023-08-26 18:44:03,139 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-26 18:44:03,150 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1091 conditions, 980 events. 146/980 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 4709 event pairs, 23 based on Foata normal form. 0/768 useless extension candidates. Maximal degree in co-relation 656. Up to 80 conditions per place. [2023-08-26 18:44:03,150 INFO L82 GeneralOperation]: Start removeDead. Operand has 208 places, 238 transitions, 536 flow [2023-08-26 18:44:03,155 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 208 places, 238 transitions, 536 flow [2023-08-26 18:44:03,155 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:44:03,155 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 208 places, 238 transitions, 536 flow [2023-08-26 18:44:03,155 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 208 places, 238 transitions, 536 flow [2023-08-26 18:44:03,155 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 208 places, 238 transitions, 536 flow [2023-08-26 18:44:03,229 INFO L124 PetriNetUnfolderBase]: 146/980 cut-off events. [2023-08-26 18:44:03,229 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-26 18:44:03,238 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1091 conditions, 980 events. 146/980 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 4709 event pairs, 23 based on Foata normal form. 0/768 useless extension candidates. Maximal degree in co-relation 656. Up to 80 conditions per place. [2023-08-26 18:44:03,256 INFO L119 LiptonReduction]: Number of co-enabled transitions 32200 [2023-08-26 18:44:05,907 INFO L134 LiptonReduction]: Checked pairs total: 89918 [2023-08-26 18:44:05,907 INFO L136 LiptonReduction]: Total number of compositions: 157 [2023-08-26 18:44:05,909 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:44:05,911 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;@26fdd7c2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:44:05,911 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:44:05,913 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:44:05,913 INFO L124 PetriNetUnfolderBase]: 0/3 cut-off events. [2023-08-26 18:44:05,913 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:44:05,913 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:44:05,913 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:44:05,913 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:44:05,913 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:44:05,914 INFO L85 PathProgramCache]: Analyzing trace with hash 75796, now seen corresponding path program 1 times [2023-08-26 18:44:05,914 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:44:05,914 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591637641] [2023-08-26 18:44:05,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:44:05,914 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:44:05,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:44:05,955 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:44:05,955 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:44:05,956 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591637641] [2023-08-26 18:44:05,956 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591637641] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:44:05,956 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:44:05,956 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:44:05,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165456646] [2023-08-26 18:44:05,956 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:44:05,958 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:44:05,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:44:05,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:44:05,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:44:05,959 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 171 out of 395 [2023-08-26 18:44:05,960 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 92 places, 120 transitions, 300 flow. Second operand has 3 states, 3 states have (on average 171.66666666666666) internal successors, (515), 3 states have internal predecessors, (515), 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 18:44:05,960 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:44:05,960 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 171 of 395 [2023-08-26 18:44:05,960 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand