/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 -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_01-simple_racing.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 12:28:37,170 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 12:28:37,255 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 12:28:37,262 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 12:28:37,263 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 12:28:37,298 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 12:28:37,299 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 12:28:37,304 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 12:28:37,304 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 12:28:37,308 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 12:28:37,308 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 12:28:37,309 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 12:28:37,309 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 12:28:37,309 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 12:28:37,310 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 12:28:37,310 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 12:28:37,310 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 12:28:37,310 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 12:28:37,310 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 12:28:37,311 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 12:28:37,311 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 12:28:37,312 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 12:28:37,312 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 12:28:37,313 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 12:28:37,313 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 12:28:37,313 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 12:28:37,314 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 12:28:37,314 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 12:28:37,314 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 12:28:37,314 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 12:28:37,315 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 12:28:37,315 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 12:28:37,315 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 12:28:37,316 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 12:28:37,316 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 12:28:37,316 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 12:28:37,611 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 12:28:37,631 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 12:28:37,633 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 12:28:37,634 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 12:28:37,634 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 12:28:37,636 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_01-simple_racing.i [2023-08-26 12:28:38,791 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 12:28:39,032 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 12:28:39,032 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_01-simple_racing.i [2023-08-26 12:28:39,051 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6de8a5b95/1e8898cd8de14ffe8991b36da582e8d9/FLAG2a4d7ce33 [2023-08-26 12:28:39,061 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6de8a5b95/1e8898cd8de14ffe8991b36da582e8d9 [2023-08-26 12:28:39,063 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 12:28:39,064 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 12:28:39,065 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 12:28:39,065 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 12:28:39,068 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 12:28:39,068 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,069 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47292d40 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39, skipping insertion in model container [2023-08-26 12:28:39,069 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,117 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 12:28:39,428 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 12:28:39,443 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 12:28:39,470 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 12:28:39,472 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 12:28:39,501 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 12:28:39,543 INFO L206 MainTranslator]: Completed translation [2023-08-26 12:28:39,544 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39 WrapperNode [2023-08-26 12:28:39,544 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 12:28:39,545 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 12:28:39,545 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 12:28:39,545 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 12:28:39,551 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,577 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,599 INFO L138 Inliner]: procedures = 170, calls = 37, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 84 [2023-08-26 12:28:39,601 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 12:28:39,603 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 12:28:39,603 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 12:28:39,603 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 12:28:39,610 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,611 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,622 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,624 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,632 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,636 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,637 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,638 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,640 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 12:28:39,650 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 12:28:39,650 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 12:28:39,650 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 12:28:39,651 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39" (1/1) ... [2023-08-26 12:28:39,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 12:28:39,670 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:28:39,681 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 12:28:39,694 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 12:28:39,717 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 12:28:39,717 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 12:28:39,717 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 12:28:39,718 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 12:28:39,718 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 12:28:39,718 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 12:28:39,718 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 12:28:39,718 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 12:28:39,718 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 12:28:39,719 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 12:28:39,719 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 12:28:39,720 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 12:28:39,875 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 12:28:39,881 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 12:28:40,149 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 12:28:40,158 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 12:28:40,158 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-08-26 12:28:40,161 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 12:28:40 BoogieIcfgContainer [2023-08-26 12:28:40,162 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 12:28:40,164 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 12:28:40,164 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 12:28:40,167 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 12:28:40,167 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 12:28:39" (1/3) ... [2023-08-26 12:28:40,168 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f09f89d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 12:28:40, skipping insertion in model container [2023-08-26 12:28:40,168 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:28:39" (2/3) ... [2023-08-26 12:28:40,169 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f09f89d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 12:28:40, skipping insertion in model container [2023-08-26 12:28:40,169 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 12:28:40" (3/3) ... [2023-08-26 12:28:40,170 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_01-simple_racing.i [2023-08-26 12:28:40,187 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 12:28:40,188 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-08-26 12:28:40,188 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 12:28:40,259 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 12:28:40,304 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 106 places, 116 transitions, 240 flow [2023-08-26 12:28:40,407 INFO L124 PetriNetUnfolderBase]: 19/159 cut-off events. [2023-08-26 12:28:40,407 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 12:28:40,413 INFO L83 FinitePrefix]: Finished finitePrefix Result has 165 conditions, 159 events. 19/159 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 392 event pairs, 0 based on Foata normal form. 0/127 useless extension candidates. Maximal degree in co-relation 76. Up to 4 conditions per place. [2023-08-26 12:28:40,413 INFO L82 GeneralOperation]: Start removeDead. Operand has 106 places, 116 transitions, 240 flow [2023-08-26 12:28:40,418 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 106 places, 116 transitions, 240 flow [2023-08-26 12:28:40,421 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:28:40,434 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 106 places, 116 transitions, 240 flow [2023-08-26 12:28:40,437 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 106 places, 116 transitions, 240 flow [2023-08-26 12:28:40,438 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 106 places, 116 transitions, 240 flow [2023-08-26 12:28:40,484 INFO L124 PetriNetUnfolderBase]: 19/159 cut-off events. [2023-08-26 12:28:40,484 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 12:28:40,485 INFO L83 FinitePrefix]: Finished finitePrefix Result has 165 conditions, 159 events. 19/159 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 392 event pairs, 0 based on Foata normal form. 0/127 useless extension candidates. Maximal degree in co-relation 76. Up to 4 conditions per place. [2023-08-26 12:28:40,487 INFO L119 LiptonReduction]: Number of co-enabled transitions 2744 [2023-08-26 12:28:43,590 INFO L134 LiptonReduction]: Checked pairs total: 4869 [2023-08-26 12:28:43,590 INFO L136 LiptonReduction]: Total number of compositions: 101 [2023-08-26 12:28:43,601 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:28:43,607 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;@79138053, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:28:43,607 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:28:43,609 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:28:43,609 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 12:28:43,610 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:28:43,610 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:28:43,610 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:28:43,611 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:28:43,615 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:28:43,615 INFO L85 PathProgramCache]: Analyzing trace with hash 14337, now seen corresponding path program 1 times [2023-08-26 12:28:43,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:28:43,626 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970042913] [2023-08-26 12:28:43,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:43,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:28:43,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:28:43,916 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 12:28:43,917 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:28:43,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970042913] [2023-08-26 12:28:43,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970042913] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:28:43,918 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:28:43,918 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:28:43,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548246763] [2023-08-26 12:28:43,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:28:43,926 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:28:43,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:28:43,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:28:43,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:28:43,948 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 80 out of 217 [2023-08-26 12:28:43,951 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 31 places, 38 transitions, 84 flow. Second operand has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 3 states have internal predecessors, (242), 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 12:28:43,951 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:28:43,951 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 80 of 217 [2023-08-26 12:28:43,952 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:28:44,058 INFO L124 PetriNetUnfolderBase]: 120/283 cut-off events. [2023-08-26 12:28:44,058 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 12:28:44,061 INFO L83 FinitePrefix]: Finished finitePrefix Result has 571 conditions, 283 events. 120/283 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 21. Compared 1308 event pairs, 0 based on Foata normal form. 25/232 useless extension candidates. Maximal degree in co-relation 527. Up to 262 conditions per place. [2023-08-26 12:28:44,065 INFO L140 encePairwiseOnDemand]: 204/217 looper letters, 33 selfloop transitions, 2 changer transitions 2/39 dead transitions. [2023-08-26 12:28:44,066 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 39 transitions, 160 flow [2023-08-26 12:28:44,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:28:44,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:28:44,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 294 transitions. [2023-08-26 12:28:44,084 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45161290322580644 [2023-08-26 12:28:44,085 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 294 transitions. [2023-08-26 12:28:44,085 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 294 transitions. [2023-08-26 12:28:44,088 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:28:44,090 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 294 transitions. [2023-08-26 12:28:44,095 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 98.0) internal successors, (294), 3 states have internal predecessors, (294), 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 12:28:44,101 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 217.0) internal successors, (868), 4 states have internal predecessors, (868), 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 12:28:44,102 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 217.0) internal successors, (868), 4 states have internal predecessors, (868), 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 12:28:44,104 INFO L175 Difference]: Start difference. First operand has 31 places, 38 transitions, 84 flow. Second operand 3 states and 294 transitions. [2023-08-26 12:28:44,104 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 39 transitions, 160 flow [2023-08-26 12:28:44,107 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 39 transitions, 160 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 12:28:44,109 INFO L231 Difference]: Finished difference. Result has 34 places, 27 transitions, 72 flow [2023-08-26 12:28:44,110 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=217, PETRI_DIFFERENCE_MINUEND_FLOW=66, PETRI_DIFFERENCE_MINUEND_PLACES=31, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=72, PETRI_PLACES=34, PETRI_TRANSITIONS=27} [2023-08-26 12:28:44,113 INFO L281 CegarLoopForPetriNet]: 31 programPoint places, 3 predicate places. [2023-08-26 12:28:44,113 INFO L495 AbstractCegarLoop]: Abstraction has has 34 places, 27 transitions, 72 flow [2023-08-26 12:28:44,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 3 states have internal predecessors, (242), 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 12:28:44,114 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:28:44,114 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:28:44,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 12:28:44,114 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:28:44,122 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:28:44,122 INFO L85 PathProgramCache]: Analyzing trace with hash 14336, now seen corresponding path program 1 times [2023-08-26 12:28:44,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:28:44,122 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505630475] [2023-08-26 12:28:44,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:44,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:28:44,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:28:44,200 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 12:28:44,200 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:28:44,200 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505630475] [2023-08-26 12:28:44,201 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505630475] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:28:44,201 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:28:44,201 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:28:44,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018730560] [2023-08-26 12:28:44,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:28:44,202 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:28:44,202 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:28:44,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:28:44,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:28:44,204 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 85 out of 217 [2023-08-26 12:28:44,204 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 34 places, 27 transitions, 72 flow. Second operand has 3 states, 3 states have (on average 85.66666666666667) internal successors, (257), 3 states have internal predecessors, (257), 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 12:28:44,205 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:28:44,205 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 85 of 217 [2023-08-26 12:28:44,205 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:28:44,287 INFO L124 PetriNetUnfolderBase]: 88/206 cut-off events. [2023-08-26 12:28:44,287 INFO L125 PetriNetUnfolderBase]: For 17/17 co-relation queries the response was YES. [2023-08-26 12:28:44,288 INFO L83 FinitePrefix]: Finished finitePrefix Result has 454 conditions, 206 events. 88/206 cut-off events. For 17/17 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 702 event pairs, 88 based on Foata normal form. 0/176 useless extension candidates. Maximal degree in co-relation 429. Up to 202 conditions per place. [2023-08-26 12:28:44,290 INFO L140 encePairwiseOnDemand]: 214/217 looper letters, 22 selfloop transitions, 1 changer transitions 0/25 dead transitions. [2023-08-26 12:28:44,290 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 32 places, 25 transitions, 114 flow [2023-08-26 12:28:44,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:28:44,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:28:44,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 280 transitions. [2023-08-26 12:28:44,293 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43010752688172044 [2023-08-26 12:28:44,294 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 280 transitions. [2023-08-26 12:28:44,294 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 280 transitions. [2023-08-26 12:28:44,295 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:28:44,295 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 280 transitions. [2023-08-26 12:28:44,298 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 93.33333333333333) internal successors, (280), 3 states have internal predecessors, (280), 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 12:28:44,302 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 217.0) internal successors, (868), 4 states have internal predecessors, (868), 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 12:28:44,303 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 217.0) internal successors, (868), 4 states have internal predecessors, (868), 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 12:28:44,303 INFO L175 Difference]: Start difference. First operand has 34 places, 27 transitions, 72 flow. Second operand 3 states and 280 transitions. [2023-08-26 12:28:44,303 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 32 places, 25 transitions, 114 flow [2023-08-26 12:28:44,304 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 25 transitions, 110 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:28:44,305 INFO L231 Difference]: Finished difference. Result has 30 places, 25 transitions, 66 flow [2023-08-26 12:28:44,305 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=217, PETRI_DIFFERENCE_MINUEND_FLOW=64, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=25, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=66, PETRI_PLACES=30, PETRI_TRANSITIONS=25} [2023-08-26 12:28:44,306 INFO L281 CegarLoopForPetriNet]: 31 programPoint places, -1 predicate places. [2023-08-26 12:28:44,307 INFO L495 AbstractCegarLoop]: Abstraction has has 30 places, 25 transitions, 66 flow [2023-08-26 12:28:44,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 85.66666666666667) internal successors, (257), 3 states have internal predecessors, (257), 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 12:28:44,308 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:28:44,308 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 12:28:44,310 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 12:28:44,311 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:28:44,313 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:28:44,313 INFO L85 PathProgramCache]: Analyzing trace with hash 427461030, now seen corresponding path program 1 times [2023-08-26 12:28:44,314 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:28:44,314 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477862147] [2023-08-26 12:28:44,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:44,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:28:44,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:28:44,453 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 12:28:44,454 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:28:44,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477862147] [2023-08-26 12:28:44,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477862147] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:28:44,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410189685] [2023-08-26 12:28:44,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:44,454 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:28:44,455 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:28:44,481 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 12:28:44,482 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 12:28:44,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:28:44,547 INFO L262 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 12:28:44,550 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:28:44,616 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 12:28:44,672 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 12:28:44,672 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:28:44,715 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 12:28:44,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410189685] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:28:44,715 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:28:44,715 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 12:28:44,715 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534297280] [2023-08-26 12:28:44,716 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:28:44,716 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 12:28:44,716 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:28:44,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 12:28:44,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 12:28:44,718 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 80 out of 217 [2023-08-26 12:28:44,719 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 25 transitions, 66 flow. Second operand has 8 states, 8 states have (on average 81.875) internal successors, (655), 8 states have internal predecessors, (655), 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 12:28:44,719 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:28:44,719 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 80 of 217 [2023-08-26 12:28:44,719 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:28:44,781 INFO L124 PetriNetUnfolderBase]: 16/55 cut-off events. [2023-08-26 12:28:44,781 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:28:44,781 INFO L83 FinitePrefix]: Finished finitePrefix Result has 126 conditions, 55 events. 16/55 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 126 event pairs, 0 based on Foata normal form. 9/64 useless extension candidates. Maximal degree in co-relation 118. Up to 34 conditions per place. [2023-08-26 12:28:44,782 INFO L140 encePairwiseOnDemand]: 213/217 looper letters, 19 selfloop transitions, 2 changer transitions 0/23 dead transitions. [2023-08-26 12:28:44,782 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 23 places, 23 transitions, 97 flow [2023-08-26 12:28:44,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 12:28:44,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 12:28:44,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 343 transitions. [2023-08-26 12:28:44,783 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3951612903225806 [2023-08-26 12:28:44,783 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 343 transitions. [2023-08-26 12:28:44,784 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 343 transitions. [2023-08-26 12:28:44,784 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:28:44,784 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 343 transitions. [2023-08-26 12:28:44,785 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 85.75) internal successors, (343), 4 states have internal predecessors, (343), 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 12:28:44,786 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 217.0) internal successors, (1085), 5 states have internal predecessors, (1085), 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 12:28:44,787 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 217.0) internal successors, (1085), 5 states have internal predecessors, (1085), 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 12:28:44,787 INFO L175 Difference]: Start difference. First operand has 30 places, 25 transitions, 66 flow. Second operand 4 states and 343 transitions. [2023-08-26 12:28:44,787 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 23 places, 23 transitions, 97 flow [2023-08-26 12:28:44,788 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 23 transitions, 94 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:28:44,788 INFO L231 Difference]: Finished difference. Result has 21 places, 14 transitions, 38 flow [2023-08-26 12:28:44,788 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=217, PETRI_DIFFERENCE_MINUEND_FLOW=34, PETRI_DIFFERENCE_MINUEND_PLACES=18, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=14, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=12, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=38, PETRI_PLACES=21, PETRI_TRANSITIONS=14} [2023-08-26 12:28:44,789 INFO L281 CegarLoopForPetriNet]: 31 programPoint places, -10 predicate places. [2023-08-26 12:28:44,789 INFO L495 AbstractCegarLoop]: Abstraction has has 21 places, 14 transitions, 38 flow [2023-08-26 12:28:44,789 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 81.875) internal successors, (655), 8 states have internal predecessors, (655), 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 12:28:44,790 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:28:44,790 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 12:28:44,799 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 12:28:44,996 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 12:28:44,996 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:28:44,996 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:28:44,996 INFO L85 PathProgramCache]: Analyzing trace with hash 366390389, now seen corresponding path program 1 times [2023-08-26 12:28:44,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:28:44,997 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [739794571] [2023-08-26 12:28:44,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:44,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:28:45,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:28:45,015 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:28:45,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:28:45,039 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:28:45,040 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:28:45,041 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (5 of 6 remaining) [2023-08-26 12:28:45,042 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 6 remaining) [2023-08-26 12:28:45,042 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 6 remaining) [2023-08-26 12:28:45,042 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 6 remaining) [2023-08-26 12:28:45,043 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 6 remaining) [2023-08-26 12:28:45,043 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (0 of 6 remaining) [2023-08-26 12:28:45,043 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 12:28:45,043 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 12:28:45,045 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:28:45,045 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 12:28:45,065 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 12:28:45,070 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 146 transitions, 310 flow [2023-08-26 12:28:45,097 INFO L124 PetriNetUnfolderBase]: 34/259 cut-off events. [2023-08-26 12:28:45,097 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 12:28:45,098 INFO L83 FinitePrefix]: Finished finitePrefix Result has 273 conditions, 259 events. 34/259 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. 0/204 useless extension candidates. Maximal degree in co-relation 161. Up to 8 conditions per place. [2023-08-26 12:28:45,098 INFO L82 GeneralOperation]: Start removeDead. Operand has 131 places, 146 transitions, 310 flow [2023-08-26 12:28:45,100 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 131 places, 146 transitions, 310 flow [2023-08-26 12:28:45,100 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:28:45,100 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 131 places, 146 transitions, 310 flow [2023-08-26 12:28:45,100 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 131 places, 146 transitions, 310 flow [2023-08-26 12:28:45,101 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 146 transitions, 310 flow [2023-08-26 12:28:45,121 INFO L124 PetriNetUnfolderBase]: 34/259 cut-off events. [2023-08-26 12:28:45,121 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 12:28:45,122 INFO L83 FinitePrefix]: Finished finitePrefix Result has 273 conditions, 259 events. 34/259 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. 0/204 useless extension candidates. Maximal degree in co-relation 161. Up to 8 conditions per place. [2023-08-26 12:28:45,127 INFO L119 LiptonReduction]: Number of co-enabled transitions 7672 [2023-08-26 12:28:47,931 INFO L134 LiptonReduction]: Checked pairs total: 19385 [2023-08-26 12:28:47,931 INFO L136 LiptonReduction]: Total number of compositions: 110 [2023-08-26 12:28:47,932 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:28:47,933 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;@79138053, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:28:47,933 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:28:47,934 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:28:47,935 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 12:28:47,935 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:28:47,935 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:28:47,935 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:28:47,935 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:28:47,935 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:28:47,935 INFO L85 PathProgramCache]: Analyzing trace with hash 23492, now seen corresponding path program 1 times [2023-08-26 12:28:47,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:28:47,936 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358386635] [2023-08-26 12:28:47,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:47,936 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:28:47,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:28:47,984 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 12:28:47,984 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:28:47,984 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358386635] [2023-08-26 12:28:47,984 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358386635] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:28:47,984 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:28:47,985 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:28:47,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765929174] [2023-08-26 12:28:47,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:28:47,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:28:47,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:28:47,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:28:47,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:28:47,986 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 107 out of 256 [2023-08-26 12:28:47,987 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 61 transitions, 140 flow. Second operand has 3 states, 3 states have (on average 107.66666666666667) internal successors, (323), 3 states have internal predecessors, (323), 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 12:28:47,987 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:28:47,987 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 107 of 256 [2023-08-26 12:28:47,987 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:28:48,321 INFO L124 PetriNetUnfolderBase]: 1501/2793 cut-off events. [2023-08-26 12:28:48,322 INFO L125 PetriNetUnfolderBase]: For 47/47 co-relation queries the response was YES. [2023-08-26 12:28:48,325 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5322 conditions, 2793 events. 1501/2793 cut-off events. For 47/47 co-relation queries the response was YES. Maximal size of possible extension queue 120. Compared 17629 event pairs, 1368 based on Foata normal form. 618/2932 useless extension candidates. Maximal degree in co-relation 2720. Up to 2272 conditions per place. [2023-08-26 12:28:48,335 INFO L140 encePairwiseOnDemand]: 237/256 looper letters, 29 selfloop transitions, 1 changer transitions 16/58 dead transitions. [2023-08-26 12:28:48,335 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 58 transitions, 226 flow [2023-08-26 12:28:48,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:28:48,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:28:48,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 396 transitions. [2023-08-26 12:28:48,337 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.515625 [2023-08-26 12:28:48,337 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 396 transitions. [2023-08-26 12:28:48,337 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 396 transitions. [2023-08-26 12:28:48,338 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:28:48,338 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 396 transitions. [2023-08-26 12:28:48,339 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 132.0) internal successors, (396), 3 states have internal predecessors, (396), 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 12:28:48,340 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 256.0) internal successors, (1024), 4 states have internal predecessors, (1024), 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 12:28:48,341 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 256.0) internal successors, (1024), 4 states have internal predecessors, (1024), 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 12:28:48,341 INFO L175 Difference]: Start difference. First operand has 49 places, 61 transitions, 140 flow. Second operand 3 states and 396 transitions. [2023-08-26 12:28:48,341 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 58 transitions, 226 flow [2023-08-26 12:28:48,342 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 49 places, 58 transitions, 226 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 12:28:48,343 INFO L231 Difference]: Finished difference. Result has 49 places, 42 transitions, 104 flow [2023-08-26 12:28:48,343 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=256, PETRI_DIFFERENCE_MINUEND_FLOW=106, PETRI_DIFFERENCE_MINUEND_PLACES=47, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=44, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=43, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=104, PETRI_PLACES=49, PETRI_TRANSITIONS=42} [2023-08-26 12:28:48,344 INFO L281 CegarLoopForPetriNet]: 49 programPoint places, 0 predicate places. [2023-08-26 12:28:48,344 INFO L495 AbstractCegarLoop]: Abstraction has has 49 places, 42 transitions, 104 flow [2023-08-26 12:28:48,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 107.66666666666667) internal successors, (323), 3 states have internal predecessors, (323), 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 12:28:48,344 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:28:48,345 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:28:48,345 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 12:28:48,345 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:28:48,345 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:28:48,345 INFO L85 PathProgramCache]: Analyzing trace with hash 23494, now seen corresponding path program 1 times [2023-08-26 12:28:48,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:28:48,346 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926393547] [2023-08-26 12:28:48,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:48,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:28:48,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:28:48,393 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 12:28:48,394 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:28:48,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926393547] [2023-08-26 12:28:48,394 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1926393547] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:28:48,394 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:28:48,394 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:28:48,394 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924174107] [2023-08-26 12:28:48,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:28:48,395 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:28:48,395 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:28:48,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:28:48,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:28:48,396 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 102 out of 256 [2023-08-26 12:28:48,397 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 42 transitions, 104 flow. Second operand has 3 states, 3 states have (on average 102.66666666666667) internal successors, (308), 3 states have internal predecessors, (308), 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 12:28:48,397 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:28:48,397 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 102 of 256 [2023-08-26 12:28:48,397 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:28:48,619 INFO L124 PetriNetUnfolderBase]: 1260/2305 cut-off events. [2023-08-26 12:28:48,619 INFO L125 PetriNetUnfolderBase]: For 44/44 co-relation queries the response was YES. [2023-08-26 12:28:48,622 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4445 conditions, 2305 events. 1260/2305 cut-off events. For 44/44 co-relation queries the response was YES. Maximal size of possible extension queue 109. Compared 14078 event pairs, 592 based on Foata normal form. 0/2000 useless extension candidates. Maximal degree in co-relation 4437. Up to 2071 conditions per place. [2023-08-26 12:28:48,631 INFO L140 encePairwiseOnDemand]: 252/256 looper letters, 36 selfloop transitions, 2 changer transitions 0/50 dead transitions. [2023-08-26 12:28:48,631 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 50 transitions, 196 flow [2023-08-26 12:28:48,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:28:48,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:28:48,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 346 transitions. [2023-08-26 12:28:48,633 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4505208333333333 [2023-08-26 12:28:48,633 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 346 transitions. [2023-08-26 12:28:48,633 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 346 transitions. [2023-08-26 12:28:48,633 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:28:48,634 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 346 transitions. [2023-08-26 12:28:48,634 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 115.33333333333333) internal successors, (346), 3 states have internal predecessors, (346), 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 12:28:48,636 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 256.0) internal successors, (1024), 4 states have internal predecessors, (1024), 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 12:28:48,636 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 256.0) internal successors, (1024), 4 states have internal predecessors, (1024), 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 12:28:48,636 INFO L175 Difference]: Start difference. First operand has 49 places, 42 transitions, 104 flow. Second operand 3 states and 346 transitions. [2023-08-26 12:28:48,636 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 50 transitions, 196 flow [2023-08-26 12:28:48,638 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 48 places, 50 transitions, 195 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:28:48,638 INFO L231 Difference]: Finished difference. Result has 49 places, 43 transitions, 117 flow [2023-08-26 12:28:48,639 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=256, PETRI_DIFFERENCE_MINUEND_FLOW=103, PETRI_DIFFERENCE_MINUEND_PLACES=46, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=42, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=40, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=117, PETRI_PLACES=49, PETRI_TRANSITIONS=43} [2023-08-26 12:28:48,639 INFO L281 CegarLoopForPetriNet]: 49 programPoint places, 0 predicate places. [2023-08-26 12:28:48,639 INFO L495 AbstractCegarLoop]: Abstraction has has 49 places, 43 transitions, 117 flow [2023-08-26 12:28:48,640 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 102.66666666666667) internal successors, (308), 3 states have internal predecessors, (308), 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 12:28:48,640 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:28:48,640 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 12:28:48,640 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 12:28:48,640 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:28:48,641 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:28:48,641 INFO L85 PathProgramCache]: Analyzing trace with hash 239574672, now seen corresponding path program 1 times [2023-08-26 12:28:48,641 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:28:48,641 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081212645] [2023-08-26 12:28:48,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:48,641 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:28:48,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:28:48,709 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 12:28:48,709 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:28:48,709 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081212645] [2023-08-26 12:28:48,709 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2081212645] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:28:48,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236766055] [2023-08-26 12:28:48,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:48,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:28:48,710 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:28:48,713 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 12:28:48,740 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 12:28:48,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:28:48,783 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 12:28:48,785 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:28:48,797 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 12:28:48,840 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 12:28:48,841 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:28:48,880 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 12:28:48,880 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1236766055] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:28:48,880 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:28:48,880 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 12:28:48,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390754616] [2023-08-26 12:28:48,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:28:48,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 12:28:48,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:28:48,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 12:28:48,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 12:28:48,883 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 102 out of 256 [2023-08-26 12:28:48,885 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 43 transitions, 117 flow. Second operand has 8 states, 8 states have (on average 103.875) internal successors, (831), 8 states have internal predecessors, (831), 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 12:28:48,887 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:28:48,887 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 102 of 256 [2023-08-26 12:28:48,887 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:28:49,033 INFO L124 PetriNetUnfolderBase]: 286/596 cut-off events. [2023-08-26 12:28:49,033 INFO L125 PetriNetUnfolderBase]: For 151/151 co-relation queries the response was YES. [2023-08-26 12:28:49,035 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1328 conditions, 596 events. 286/596 cut-off events. For 151/151 co-relation queries the response was YES. Maximal size of possible extension queue 34. Compared 3005 event pairs, 50 based on Foata normal form. 70/662 useless extension candidates. Maximal degree in co-relation 1318. Up to 346 conditions per place. [2023-08-26 12:28:49,037 INFO L140 encePairwiseOnDemand]: 252/256 looper letters, 39 selfloop transitions, 3 changer transitions 0/52 dead transitions. [2023-08-26 12:28:49,037 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 42 places, 52 transitions, 209 flow [2023-08-26 12:28:49,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 12:28:49,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 12:28:49,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 556 transitions. [2023-08-26 12:28:49,039 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.434375 [2023-08-26 12:28:49,040 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 556 transitions. [2023-08-26 12:28:49,040 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 556 transitions. [2023-08-26 12:28:49,040 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:28:49,040 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 556 transitions. [2023-08-26 12:28:49,041 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 111.2) internal successors, (556), 5 states have internal predecessors, (556), 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 12:28:49,043 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 256.0) internal successors, (1536), 6 states have internal predecessors, (1536), 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 12:28:49,043 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 256.0) internal successors, (1536), 6 states have internal predecessors, (1536), 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 12:28:49,044 INFO L175 Difference]: Start difference. First operand has 49 places, 43 transitions, 117 flow. Second operand 5 states and 556 transitions. [2023-08-26 12:28:49,044 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 42 places, 52 transitions, 209 flow [2023-08-26 12:28:49,045 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 41 places, 52 transitions, 205 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-26 12:28:49,046 INFO L231 Difference]: Finished difference. Result has 41 places, 30 transitions, 83 flow [2023-08-26 12:28:49,046 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=256, PETRI_DIFFERENCE_MINUEND_FLOW=77, PETRI_DIFFERENCE_MINUEND_PLACES=37, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=83, PETRI_PLACES=41, PETRI_TRANSITIONS=30} [2023-08-26 12:28:49,046 INFO L281 CegarLoopForPetriNet]: 49 programPoint places, -8 predicate places. [2023-08-26 12:28:49,046 INFO L495 AbstractCegarLoop]: Abstraction has has 41 places, 30 transitions, 83 flow [2023-08-26 12:28:49,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 103.875) internal successors, (831), 8 states have internal predecessors, (831), 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 12:28:49,047 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:28:49,047 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 12:28:49,055 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 12:28:49,257 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 12:28:49,257 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:28:49,258 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:28:49,258 INFO L85 PathProgramCache]: Analyzing trace with hash 2036283543, now seen corresponding path program 1 times [2023-08-26 12:28:49,258 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:28:49,258 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437099652] [2023-08-26 12:28:49,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:49,258 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:28:49,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:28:49,272 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:28:49,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:28:49,289 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:28:49,289 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:28:49,289 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (5 of 6 remaining) [2023-08-26 12:28:49,290 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 6 remaining) [2023-08-26 12:28:49,290 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 6 remaining) [2023-08-26 12:28:49,290 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 6 remaining) [2023-08-26 12:28:49,290 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 6 remaining) [2023-08-26 12:28:49,290 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (0 of 6 remaining) [2023-08-26 12:28:49,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 12:28:49,290 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 12:28:49,291 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:28:49,291 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 12:28:49,315 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 12:28:49,318 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 156 places, 176 transitions, 382 flow [2023-08-26 12:28:49,347 INFO L124 PetriNetUnfolderBase]: 54/396 cut-off events. [2023-08-26 12:28:49,347 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 12:28:49,350 INFO L83 FinitePrefix]: Finished finitePrefix Result has 424 conditions, 396 events. 54/396 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. 0/310 useless extension candidates. Maximal degree in co-relation 267. Up to 16 conditions per place. [2023-08-26 12:28:49,350 INFO L82 GeneralOperation]: Start removeDead. Operand has 156 places, 176 transitions, 382 flow [2023-08-26 12:28:49,352 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 156 places, 176 transitions, 382 flow [2023-08-26 12:28:49,353 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:28:49,353 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 156 places, 176 transitions, 382 flow [2023-08-26 12:28:49,353 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 156 places, 176 transitions, 382 flow [2023-08-26 12:28:49,353 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 156 places, 176 transitions, 382 flow [2023-08-26 12:28:49,383 INFO L124 PetriNetUnfolderBase]: 54/396 cut-off events. [2023-08-26 12:28:49,383 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 12:28:49,385 INFO L83 FinitePrefix]: Finished finitePrefix Result has 424 conditions, 396 events. 54/396 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. 0/310 useless extension candidates. Maximal degree in co-relation 267. Up to 16 conditions per place. [2023-08-26 12:28:49,396 INFO L119 LiptonReduction]: Number of co-enabled transitions 14112 [2023-08-26 12:28:52,104 INFO L134 LiptonReduction]: Checked pairs total: 37043 [2023-08-26 12:28:52,105 INFO L136 LiptonReduction]: Total number of compositions: 125 [2023-08-26 12:28:52,106 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:28:52,107 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;@79138053, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:28:52,107 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:28:52,108 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:28:52,108 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 12:28:52,108 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:28:52,108 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:28:52,108 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:28:52,108 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:28:52,109 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:28:52,109 INFO L85 PathProgramCache]: Analyzing trace with hash 34077, now seen corresponding path program 1 times [2023-08-26 12:28:52,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:28:52,109 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133882782] [2023-08-26 12:28:52,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:52,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:28:52,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:28:52,129 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 12:28:52,130 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:28:52,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133882782] [2023-08-26 12:28:52,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2133882782] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:28:52,130 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:28:52,130 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:28:52,130 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845273597] [2023-08-26 12:28:52,130 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:28:52,131 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:28:52,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:28:52,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:28:52,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:28:52,132 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 129 out of 301 [2023-08-26 12:28:52,132 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 82 transitions, 194 flow. Second operand has 3 states, 3 states have (on average 129.66666666666666) internal successors, (389), 3 states have internal predecessors, (389), 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 12:28:52,132 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:28:52,132 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 129 of 301 [2023-08-26 12:28:52,132 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:28:55,289 INFO L124 PetriNetUnfolderBase]: 30408/45157 cut-off events. [2023-08-26 12:28:55,289 INFO L125 PetriNetUnfolderBase]: For 1039/1039 co-relation queries the response was YES. [2023-08-26 12:28:55,369 INFO L83 FinitePrefix]: Finished finitePrefix Result has 88756 conditions, 45157 events. 30408/45157 cut-off events. For 1039/1039 co-relation queries the response was YES. Maximal size of possible extension queue 1236. Compared 316634 event pairs, 27897 based on Foata normal form. 9877/49311 useless extension candidates. Maximal degree in co-relation 20771. Up to 39478 conditions per place. [2023-08-26 12:28:55,635 INFO L140 encePairwiseOnDemand]: 275/301 looper letters, 42 selfloop transitions, 1 changer transitions 26/81 dead transitions. [2023-08-26 12:28:55,635 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 81 transitions, 330 flow [2023-08-26 12:28:55,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:28:55,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:28:55,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 498 transitions. [2023-08-26 12:28:55,637 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5514950166112956 [2023-08-26 12:28:55,637 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 498 transitions. [2023-08-26 12:28:55,637 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 498 transitions. [2023-08-26 12:28:55,638 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:28:55,638 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 498 transitions. [2023-08-26 12:28:55,639 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 166.0) internal successors, (498), 3 states have internal predecessors, (498), 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 12:28:55,640 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 301.0) internal successors, (1204), 4 states have internal predecessors, (1204), 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 12:28:55,641 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 301.0) internal successors, (1204), 4 states have internal predecessors, (1204), 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 12:28:55,641 INFO L175 Difference]: Start difference. First operand has 64 places, 82 transitions, 194 flow. Second operand 3 states and 498 transitions. [2023-08-26 12:28:55,641 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 81 transitions, 330 flow [2023-08-26 12:28:55,643 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 63 places, 81 transitions, 330 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 12:28:55,644 INFO L231 Difference]: Finished difference. Result has 63 places, 55 transitions, 142 flow [2023-08-26 12:28:55,644 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=301, PETRI_DIFFERENCE_MINUEND_FLOW=144, PETRI_DIFFERENCE_MINUEND_PLACES=61, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=57, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=56, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=142, PETRI_PLACES=63, PETRI_TRANSITIONS=55} [2023-08-26 12:28:55,644 INFO L281 CegarLoopForPetriNet]: 64 programPoint places, -1 predicate places. [2023-08-26 12:28:55,645 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 55 transitions, 142 flow [2023-08-26 12:28:55,645 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 129.66666666666666) internal successors, (389), 3 states have internal predecessors, (389), 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 12:28:55,645 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:28:55,645 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:28:55,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 12:28:55,645 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:28:55,646 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:28:55,646 INFO L85 PathProgramCache]: Analyzing trace with hash 34076, now seen corresponding path program 1 times [2023-08-26 12:28:55,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:28:55,646 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273522076] [2023-08-26 12:28:55,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:55,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:28:55,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:28:55,682 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 12:28:55,682 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:28:55,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273522076] [2023-08-26 12:28:55,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273522076] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:28:55,682 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:28:55,682 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:28:55,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861643924] [2023-08-26 12:28:55,683 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:28:55,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:28:55,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:28:55,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:28:55,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:28:55,684 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 124 out of 301 [2023-08-26 12:28:55,684 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 55 transitions, 142 flow. Second operand has 3 states, 3 states have (on average 124.66666666666667) internal successors, (374), 3 states have internal predecessors, (374), 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 12:28:55,684 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:28:55,684 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 124 of 301 [2023-08-26 12:28:55,685 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:28:57,788 INFO L124 PetriNetUnfolderBase]: 25911/38945 cut-off events. [2023-08-26 12:28:57,788 INFO L125 PetriNetUnfolderBase]: For 1071/1071 co-relation queries the response was YES. [2023-08-26 12:28:57,840 INFO L83 FinitePrefix]: Finished finitePrefix Result has 76241 conditions, 38945 events. 25911/38945 cut-off events. For 1071/1071 co-relation queries the response was YES. Maximal size of possible extension queue 1077. Compared 271003 event pairs, 16705 based on Foata normal form. 0/35127 useless extension candidates. Maximal degree in co-relation 76232. Up to 36545 conditions per place. [2023-08-26 12:28:57,965 INFO L140 encePairwiseOnDemand]: 297/301 looper letters, 51 selfloop transitions, 2 changer transitions 0/65 dead transitions. [2023-08-26 12:28:57,966 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 65 transitions, 268 flow [2023-08-26 12:28:57,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:28:57,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:28:57,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 427 transitions. [2023-08-26 12:28:57,967 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4728682170542636 [2023-08-26 12:28:57,967 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 427 transitions. [2023-08-26 12:28:57,968 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 427 transitions. [2023-08-26 12:28:57,968 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:28:57,968 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 427 transitions. [2023-08-26 12:28:57,969 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 142.33333333333334) internal successors, (427), 3 states have internal predecessors, (427), 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 12:28:57,970 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 301.0) internal successors, (1204), 4 states have internal predecessors, (1204), 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 12:28:57,971 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 301.0) internal successors, (1204), 4 states have internal predecessors, (1204), 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 12:28:57,971 INFO L175 Difference]: Start difference. First operand has 63 places, 55 transitions, 142 flow. Second operand 3 states and 427 transitions. [2023-08-26 12:28:57,971 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 65 transitions, 268 flow [2023-08-26 12:28:57,972 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 62 places, 65 transitions, 267 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:28:57,975 INFO L231 Difference]: Finished difference. Result has 63 places, 56 transitions, 155 flow [2023-08-26 12:28:57,975 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=301, PETRI_DIFFERENCE_MINUEND_FLOW=141, PETRI_DIFFERENCE_MINUEND_PLACES=60, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=55, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=53, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=155, PETRI_PLACES=63, PETRI_TRANSITIONS=56} [2023-08-26 12:28:57,977 INFO L281 CegarLoopForPetriNet]: 64 programPoint places, -1 predicate places. [2023-08-26 12:28:57,978 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 56 transitions, 155 flow [2023-08-26 12:28:57,978 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 124.66666666666667) internal successors, (374), 3 states have internal predecessors, (374), 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 12:28:57,978 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:28:57,978 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 12:28:57,978 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 12:28:57,978 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:28:57,979 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:28:57,979 INFO L85 PathProgramCache]: Analyzing trace with hash 1434750194, now seen corresponding path program 1 times [2023-08-26 12:28:57,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:28:57,981 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935426991] [2023-08-26 12:28:57,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:57,981 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:28:57,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:28:58,068 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 12:28:58,069 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:28:58,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935426991] [2023-08-26 12:28:58,069 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935426991] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:28:58,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2029172992] [2023-08-26 12:28:58,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:58,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:28:58,069 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:28:58,070 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 12:28:58,073 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 12:28:58,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:28:58,135 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 12:28:58,136 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:28:58,147 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 12:28:58,187 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 12:28:58,188 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:28:58,225 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 12:28:58,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2029172992] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:28:58,226 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:28:58,226 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 12:28:58,226 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261359960] [2023-08-26 12:28:58,226 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:28:58,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 12:28:58,227 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:28:58,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 12:28:58,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 12:28:58,228 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 124 out of 301 [2023-08-26 12:28:58,229 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 56 transitions, 155 flow. Second operand has 8 states, 8 states have (on average 125.875) internal successors, (1007), 8 states have internal predecessors, (1007), 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 12:28:58,229 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:28:58,229 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 124 of 301 [2023-08-26 12:28:58,229 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:28:58,937 INFO L124 PetriNetUnfolderBase]: 5560/9112 cut-off events. [2023-08-26 12:28:58,937 INFO L125 PetriNetUnfolderBase]: For 3258/3258 co-relation queries the response was YES. [2023-08-26 12:28:58,951 INFO L83 FinitePrefix]: Finished finitePrefix Result has 20508 conditions, 9112 events. 5560/9112 cut-off events. For 3258/3258 co-relation queries the response was YES. Maximal size of possible extension queue 312. Compared 60869 event pairs, 0 based on Foata normal form. 819/9930 useless extension candidates. Maximal degree in co-relation 20497. Up to 5346 conditions per place. [2023-08-26 12:28:58,979 INFO L140 encePairwiseOnDemand]: 297/301 looper letters, 79 selfloop transitions, 4 changer transitions 0/94 dead transitions. [2023-08-26 12:28:58,979 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 57 places, 94 transitions, 386 flow [2023-08-26 12:28:58,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 12:28:58,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 12:28:58,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 833 transitions. [2023-08-26 12:28:58,982 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46124031007751937 [2023-08-26 12:28:58,982 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 833 transitions. [2023-08-26 12:28:58,982 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 833 transitions. [2023-08-26 12:28:58,982 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:28:58,983 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 833 transitions. [2023-08-26 12:28:58,984 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 138.83333333333334) internal successors, (833), 6 states have internal predecessors, (833), 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 12:28:58,986 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 301.0) internal successors, (2107), 7 states have internal predecessors, (2107), 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 12:28:58,987 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 301.0) internal successors, (2107), 7 states have internal predecessors, (2107), 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 12:28:58,987 INFO L175 Difference]: Start difference. First operand has 63 places, 56 transitions, 155 flow. Second operand 6 states and 833 transitions. [2023-08-26 12:28:58,987 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 57 places, 94 transitions, 386 flow [2023-08-26 12:28:58,992 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 56 places, 94 transitions, 378 flow, removed 3 selfloop flow, removed 1 redundant places. [2023-08-26 12:28:58,993 INFO L231 Difference]: Finished difference. Result has 56 places, 43 transitions, 118 flow [2023-08-26 12:28:58,994 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=301, PETRI_DIFFERENCE_MINUEND_FLOW=106, PETRI_DIFFERENCE_MINUEND_PLACES=51, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=42, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=118, PETRI_PLACES=56, PETRI_TRANSITIONS=43} [2023-08-26 12:28:58,994 INFO L281 CegarLoopForPetriNet]: 64 programPoint places, -8 predicate places. [2023-08-26 12:28:58,994 INFO L495 AbstractCegarLoop]: Abstraction has has 56 places, 43 transitions, 118 flow [2023-08-26 12:28:58,995 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 125.875) internal successors, (1007), 8 states have internal predecessors, (1007), 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 12:28:58,995 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:28:58,995 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 12:28:59,001 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-08-26 12:28:59,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:28:59,200 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:28:59,200 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:28:59,201 INFO L85 PathProgramCache]: Analyzing trace with hash -1577350676, now seen corresponding path program 1 times [2023-08-26 12:28:59,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:28:59,201 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425841698] [2023-08-26 12:28:59,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:28:59,201 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:28:59,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:28:59,218 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:28:59,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:28:59,241 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:28:59,241 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:28:59,241 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (5 of 6 remaining) [2023-08-26 12:28:59,241 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 6 remaining) [2023-08-26 12:28:59,241 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 6 remaining) [2023-08-26 12:28:59,241 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 6 remaining) [2023-08-26 12:28:59,242 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 6 remaining) [2023-08-26 12:28:59,242 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (0 of 6 remaining) [2023-08-26 12:28:59,242 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 12:28:59,242 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 12:28:59,243 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:28:59,243 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 12:28:59,267 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 12:28:59,269 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 206 transitions, 456 flow [2023-08-26 12:28:59,324 INFO L124 PetriNetUnfolderBase]: 86/609 cut-off events. [2023-08-26 12:28:59,325 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 12:28:59,330 INFO L83 FinitePrefix]: Finished finitePrefix Result has 664 conditions, 609 events. 86/609 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2434 event pairs, 6 based on Foata normal form. 0/476 useless extension candidates. Maximal degree in co-relation 416. Up to 32 conditions per place. [2023-08-26 12:28:59,330 INFO L82 GeneralOperation]: Start removeDead. Operand has 181 places, 206 transitions, 456 flow [2023-08-26 12:28:59,334 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 181 places, 206 transitions, 456 flow [2023-08-26 12:28:59,334 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:28:59,334 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 181 places, 206 transitions, 456 flow [2023-08-26 12:28:59,334 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 181 places, 206 transitions, 456 flow [2023-08-26 12:28:59,334 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 206 transitions, 456 flow [2023-08-26 12:28:59,384 INFO L124 PetriNetUnfolderBase]: 86/609 cut-off events. [2023-08-26 12:28:59,385 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 12:28:59,390 INFO L83 FinitePrefix]: Finished finitePrefix Result has 664 conditions, 609 events. 86/609 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2434 event pairs, 6 based on Foata normal form. 0/476 useless extension candidates. Maximal degree in co-relation 416. Up to 32 conditions per place. [2023-08-26 12:28:59,408 INFO L119 LiptonReduction]: Number of co-enabled transitions 22288 [2023-08-26 12:29:02,314 INFO L134 LiptonReduction]: Checked pairs total: 60781 [2023-08-26 12:29:02,314 INFO L136 LiptonReduction]: Total number of compositions: 140 [2023-08-26 12:29:02,316 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:29:02,316 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;@79138053, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:29:02,316 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:29:02,317 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:29:02,317 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 12:29:02,318 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:29:02,318 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:29:02,318 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:29:02,318 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:29:02,318 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:29:02,318 INFO L85 PathProgramCache]: Analyzing trace with hash 46123, now seen corresponding path program 1 times [2023-08-26 12:29:02,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:29:02,318 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104151400] [2023-08-26 12:29:02,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:29:02,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:29:02,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:29:02,361 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 12:29:02,362 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:29:02,362 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104151400] [2023-08-26 12:29:02,362 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104151400] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:29:02,362 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:29:02,362 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:29:02,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851389642] [2023-08-26 12:29:02,362 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:29:02,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:29:02,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:29:02,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:29:02,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:29:02,364 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 146 out of 346 [2023-08-26 12:29:02,364 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 77 places, 99 transitions, 242 flow. Second operand has 3 states, 3 states have (on average 146.66666666666666) internal successors, (440), 3 states have internal predecessors, (440), 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 12:29:02,364 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:29:02,365 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 146 of 346 [2023-08-26 12:29:02,365 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:29:31,104 INFO L124 PetriNetUnfolderBase]: 311519/432997 cut-off events. [2023-08-26 12:29:31,104 INFO L125 PetriNetUnfolderBase]: For 12215/12215 co-relation queries the response was YES. [2023-08-26 12:29:31,913 INFO L83 FinitePrefix]: Finished finitePrefix Result has 847538 conditions, 432997 events. 311519/432997 cut-off events. For 12215/12215 co-relation queries the response was YES. Maximal size of possible extension queue 9792. Compared 3472827 event pairs, 230746 based on Foata normal form. 79221/461218 useless extension candidates. Maximal degree in co-relation 81597. Up to 407756 conditions per place. [2023-08-26 12:29:33,273 INFO L140 encePairwiseOnDemand]: 315/346 looper letters, 60 selfloop transitions, 2 changer transitions 2/82 dead transitions. [2023-08-26 12:29:33,274 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 79 places, 82 transitions, 336 flow [2023-08-26 12:29:33,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:29:33,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:29:33,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 537 transitions. [2023-08-26 12:29:33,276 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5173410404624278 [2023-08-26 12:29:33,276 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 537 transitions. [2023-08-26 12:29:33,276 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 537 transitions. [2023-08-26 12:29:33,276 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:29:33,276 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 537 transitions. [2023-08-26 12:29:33,277 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 179.0) internal successors, (537), 3 states have internal predecessors, (537), 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 12:29:33,279 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 346.0) internal successors, (1384), 4 states have internal predecessors, (1384), 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 12:29:33,279 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 346.0) internal successors, (1384), 4 states have internal predecessors, (1384), 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 12:29:33,279 INFO L175 Difference]: Start difference. First operand has 77 places, 99 transitions, 242 flow. Second operand 3 states and 537 transitions. [2023-08-26 12:29:33,279 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 79 places, 82 transitions, 336 flow [2023-08-26 12:29:33,283 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 82 transitions, 336 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 12:29:33,284 INFO L231 Difference]: Finished difference. Result has 80 places, 71 transitions, 198 flow [2023-08-26 12:29:33,284 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=346, PETRI_DIFFERENCE_MINUEND_FLOW=188, PETRI_DIFFERENCE_MINUEND_PLACES=77, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=72, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=70, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=198, PETRI_PLACES=80, PETRI_TRANSITIONS=71} [2023-08-26 12:29:33,285 INFO L281 CegarLoopForPetriNet]: 77 programPoint places, 3 predicate places. [2023-08-26 12:29:33,285 INFO L495 AbstractCegarLoop]: Abstraction has has 80 places, 71 transitions, 198 flow [2023-08-26 12:29:33,285 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 146.66666666666666) internal successors, (440), 3 states have internal predecessors, (440), 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 12:29:33,285 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:29:33,285 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:29:33,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 12:29:33,286 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:29:33,286 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:29:33,286 INFO L85 PathProgramCache]: Analyzing trace with hash 46122, now seen corresponding path program 1 times [2023-08-26 12:29:33,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:29:33,286 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594106804] [2023-08-26 12:29:33,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:29:33,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:29:33,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:29:33,304 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 12:29:33,304 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:29:33,304 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594106804] [2023-08-26 12:29:33,305 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1594106804] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:29:33,305 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:29:33,305 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:29:33,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078259990] [2023-08-26 12:29:33,305 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:29:33,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:29:33,305 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:29:33,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:29:33,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:29:33,306 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 151 out of 346 [2023-08-26 12:29:33,307 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 80 places, 71 transitions, 198 flow. Second operand has 3 states, 3 states have (on average 151.66666666666666) internal successors, (455), 3 states have internal predecessors, (455), 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 12:29:33,307 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:29:33,307 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 151 of 346 [2023-08-26 12:29:33,307 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:29:53,372 INFO L124 PetriNetUnfolderBase]: 230525/321334 cut-off events. [2023-08-26 12:29:53,372 INFO L125 PetriNetUnfolderBase]: For 22372/22372 co-relation queries the response was YES. [2023-08-26 12:29:54,104 INFO L83 FinitePrefix]: Finished finitePrefix Result has 645503 conditions, 321334 events. 230525/321334 cut-off events. For 22372/22372 co-relation queries the response was YES. Maximal size of possible extension queue 7315. Compared 2513058 event pairs, 229706 based on Foata normal form. 0/301068 useless extension candidates. Maximal degree in co-relation 645435. Up to 301807 conditions per place. [2023-08-26 12:29:55,361 INFO L140 encePairwiseOnDemand]: 343/346 looper letters, 50 selfloop transitions, 1 changer transitions 0/69 dead transitions. [2023-08-26 12:29:55,362 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 69 transitions, 296 flow [2023-08-26 12:29:55,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:29:55,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:29:55,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 505 transitions. [2023-08-26 12:29:55,363 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4865125240847784 [2023-08-26 12:29:55,364 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 505 transitions. [2023-08-26 12:29:55,364 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 505 transitions. [2023-08-26 12:29:55,364 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:29:55,364 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 505 transitions. [2023-08-26 12:29:55,365 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 168.33333333333334) internal successors, (505), 3 states have internal predecessors, (505), 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 12:29:55,367 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 346.0) internal successors, (1384), 4 states have internal predecessors, (1384), 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 12:29:55,367 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 346.0) internal successors, (1384), 4 states have internal predecessors, (1384), 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 12:29:55,367 INFO L175 Difference]: Start difference. First operand has 80 places, 71 transitions, 198 flow. Second operand 3 states and 505 transitions. [2023-08-26 12:29:55,367 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 69 transitions, 296 flow [2023-08-26 12:29:55,373 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 77 places, 69 transitions, 294 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:29:55,374 INFO L231 Difference]: Finished difference. Result has 77 places, 69 transitions, 194 flow [2023-08-26 12:29:55,374 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=346, PETRI_DIFFERENCE_MINUEND_FLOW=192, PETRI_DIFFERENCE_MINUEND_PLACES=75, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=69, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=68, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=194, PETRI_PLACES=77, PETRI_TRANSITIONS=69} [2023-08-26 12:29:55,374 INFO L281 CegarLoopForPetriNet]: 77 programPoint places, 0 predicate places. [2023-08-26 12:29:55,374 INFO L495 AbstractCegarLoop]: Abstraction has has 77 places, 69 transitions, 194 flow [2023-08-26 12:29:55,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 151.66666666666666) internal successors, (455), 3 states have internal predecessors, (455), 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 12:29:55,375 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:29:55,375 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 12:29:55,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-26 12:29:55,375 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:29:55,375 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:29:55,375 INFO L85 PathProgramCache]: Analyzing trace with hash -317163463, now seen corresponding path program 1 times [2023-08-26 12:29:55,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:29:55,376 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033242368] [2023-08-26 12:29:55,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:29:55,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:29:55,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:29:55,441 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 12:29:55,441 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:29:55,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033242368] [2023-08-26 12:29:55,441 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033242368] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:29:55,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [786759097] [2023-08-26 12:29:55,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:29:55,441 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:29:55,442 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:29:55,445 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 12:29:55,478 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 12:29:55,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:29:55,523 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 12:29:55,524 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:29:55,538 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 12:29:55,577 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 12:29:55,577 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:29:55,620 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 12:29:55,621 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [786759097] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:29:55,621 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:29:55,621 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 12:29:55,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837545994] [2023-08-26 12:29:55,621 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:29:55,621 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 12:29:55,622 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:29:55,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 12:29:55,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2023-08-26 12:29:55,624 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 146 out of 346 [2023-08-26 12:29:55,625 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 77 places, 69 transitions, 194 flow. Second operand has 8 states, 8 states have (on average 147.875) internal successors, (1183), 8 states have internal predecessors, (1183), 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 12:29:55,625 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:29:55,625 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 146 of 346 [2023-08-26 12:29:55,625 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:30:14,554 INFO L124 PetriNetUnfolderBase]: 229019/311676 cut-off events. [2023-08-26 12:30:14,555 INFO L125 PetriNetUnfolderBase]: For 23529/23529 co-relation queries the response was YES. [2023-08-26 12:30:15,438 INFO L83 FinitePrefix]: Finished finitePrefix Result has 635932 conditions, 311676 events. 229019/311676 cut-off events. For 23529/23529 co-relation queries the response was YES. Maximal size of possible extension queue 7286. Compared 2347176 event pairs, 41519 based on Foata normal form. 8/294409 useless extension candidates. Maximal degree in co-relation 635920. Up to 256542 conditions per place. [2023-08-26 12:30:16,892 INFO L140 encePairwiseOnDemand]: 341/346 looper letters, 122 selfloop transitions, 8 changer transitions 0/148 dead transitions. [2023-08-26 12:30:16,893 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 82 places, 148 transitions, 620 flow [2023-08-26 12:30:16,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 12:30:16,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 12:30:16,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1010 transitions. [2023-08-26 12:30:16,897 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4865125240847784 [2023-08-26 12:30:16,897 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1010 transitions. [2023-08-26 12:30:16,897 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1010 transitions. [2023-08-26 12:30:16,898 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:30:16,898 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1010 transitions. [2023-08-26 12:30:16,900 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 168.33333333333334) internal successors, (1010), 6 states have internal predecessors, (1010), 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 12:30:16,910 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 346.0) internal successors, (2422), 7 states have internal predecessors, (2422), 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 12:30:16,911 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 346.0) internal successors, (2422), 7 states have internal predecessors, (2422), 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 12:30:16,911 INFO L175 Difference]: Start difference. First operand has 77 places, 69 transitions, 194 flow. Second operand 6 states and 1010 transitions. [2023-08-26 12:30:16,911 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 82 places, 148 transitions, 620 flow [2023-08-26 12:30:16,913 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 81 places, 148 transitions, 619 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:30:16,921 INFO L231 Difference]: Finished difference. Result has 85 places, 74 transitions, 251 flow [2023-08-26 12:30:16,922 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=346, PETRI_DIFFERENCE_MINUEND_FLOW=193, PETRI_DIFFERENCE_MINUEND_PLACES=76, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=69, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=64, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=251, PETRI_PLACES=85, PETRI_TRANSITIONS=74} [2023-08-26 12:30:16,922 INFO L281 CegarLoopForPetriNet]: 77 programPoint places, 8 predicate places. [2023-08-26 12:30:16,922 INFO L495 AbstractCegarLoop]: Abstraction has has 85 places, 74 transitions, 251 flow [2023-08-26 12:30:16,923 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 147.875) internal successors, (1183), 8 states have internal predecessors, (1183), 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 12:30:16,923 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:30:16,923 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 12:30:16,928 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-08-26 12:30:17,127 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-08-26 12:30:17,129 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:30:17,130 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:30:17,130 INFO L85 PathProgramCache]: Analyzing trace with hash -1268979961, now seen corresponding path program 1 times [2023-08-26 12:30:17,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:30:17,130 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615983156] [2023-08-26 12:30:17,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:30:17,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:30:17,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:30:17,263 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 12:30:17,264 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:30:17,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615983156] [2023-08-26 12:30:17,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615983156] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:30:17,264 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:30:17,264 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:30:17,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192175272] [2023-08-26 12:30:17,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:30:17,278 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:30:17,279 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:30:17,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:30:17,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:30:17,297 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 149 out of 346 [2023-08-26 12:30:17,297 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 85 places, 74 transitions, 251 flow. Second operand has 3 states, 3 states have (on average 151.66666666666666) internal successors, (455), 3 states have internal predecessors, (455), 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 12:30:17,298 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:30:17,298 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 149 of 346 [2023-08-26 12:30:17,298 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:31:02,287 INFO L124 PetriNetUnfolderBase]: 541155/722127 cut-off events. [2023-08-26 12:31:02,288 INFO L125 PetriNetUnfolderBase]: For 280939/280939 co-relation queries the response was YES. [2023-08-26 12:31:04,793 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1566177 conditions, 722127 events. 541155/722127 cut-off events. For 280939/280939 co-relation queries the response was YES. Maximal size of possible extension queue 12944. Compared 5232176 event pairs, 258218 based on Foata normal form. 0/693770 useless extension candidates. Maximal degree in co-relation 1566160. Up to 694445 conditions per place. [2023-08-26 12:31:07,192 INFO L140 encePairwiseOnDemand]: 340/346 looper letters, 92 selfloop transitions, 5 changer transitions 0/107 dead transitions. [2023-08-26 12:31:07,192 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 87 places, 107 transitions, 585 flow [2023-08-26 12:31:07,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:31:07,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:31:07,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 533 transitions. [2023-08-26 12:31:07,194 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5134874759152216 [2023-08-26 12:31:07,194 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 533 transitions. [2023-08-26 12:31:07,194 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 533 transitions. [2023-08-26 12:31:07,194 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:31:07,194 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 533 transitions. [2023-08-26 12:31:07,195 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 177.66666666666666) internal successors, (533), 3 states have internal predecessors, (533), 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 12:31:07,196 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 346.0) internal successors, (1384), 4 states have internal predecessors, (1384), 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 12:31:07,196 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 346.0) internal successors, (1384), 4 states have internal predecessors, (1384), 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 12:31:07,196 INFO L175 Difference]: Start difference. First operand has 85 places, 74 transitions, 251 flow. Second operand 3 states and 533 transitions. [2023-08-26 12:31:07,196 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 87 places, 107 transitions, 585 flow [2023-08-26 12:31:07,355 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 86 places, 107 transitions, 562 flow, removed 10 selfloop flow, removed 1 redundant places. [2023-08-26 12:31:07,356 INFO L231 Difference]: Finished difference. Result has 87 places, 78 transitions, 272 flow [2023-08-26 12:31:07,356 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=346, PETRI_DIFFERENCE_MINUEND_FLOW=239, PETRI_DIFFERENCE_MINUEND_PLACES=84, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=74, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=69, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=272, PETRI_PLACES=87, PETRI_TRANSITIONS=78} [2023-08-26 12:31:07,357 INFO L281 CegarLoopForPetriNet]: 77 programPoint places, 10 predicate places. [2023-08-26 12:31:07,357 INFO L495 AbstractCegarLoop]: Abstraction has has 87 places, 78 transitions, 272 flow [2023-08-26 12:31:07,357 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 151.66666666666666) internal successors, (455), 3 states have internal predecessors, (455), 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 12:31:07,357 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:31:07,357 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 12:31:07,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-08-26 12:31:07,357 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:31:07,358 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:31:07,358 INFO L85 PathProgramCache]: Analyzing trace with hash 117607480, now seen corresponding path program 1 times [2023-08-26 12:31:07,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:31:07,358 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934733167] [2023-08-26 12:31:07,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:31:07,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:31:07,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:31:07,447 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 12:31:07,447 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:31:07,447 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934733167] [2023-08-26 12:31:07,447 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934733167] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:31:07,447 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302530159] [2023-08-26 12:31:07,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:31:07,447 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:31:07,447 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:31:07,448 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 12:31:07,453 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 12:31:07,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:31:07,527 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 12:31:07,528 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:31:07,553 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 12:31:07,554 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:31:07,591 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 12:31:07,591 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1302530159] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:31:07,591 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:31:07,591 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 11 [2023-08-26 12:31:07,591 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211392464] [2023-08-26 12:31:07,592 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:31:07,592 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-08-26 12:31:07,592 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:31:07,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-08-26 12:31:07,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2023-08-26 12:31:07,594 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 140 out of 346 [2023-08-26 12:31:07,595 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 87 places, 78 transitions, 272 flow. Second operand has 12 states, 12 states have (on average 142.83333333333334) internal successors, (1714), 12 states have internal predecessors, (1714), 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 12:31:07,595 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:31:07,595 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 140 of 346 [2023-08-26 12:31:07,595 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:31:14,276 INFO L124 PetriNetUnfolderBase]: 71649/99955 cut-off events. [2023-08-26 12:31:14,276 INFO L125 PetriNetUnfolderBase]: For 103974/103974 co-relation queries the response was YES. [2023-08-26 12:31:14,595 INFO L83 FinitePrefix]: Finished finitePrefix Result has 255936 conditions, 99955 events. 71649/99955 cut-off events. For 103974/103974 co-relation queries the response was YES. Maximal size of possible extension queue 2787. Compared 713068 event pairs, 9517 based on Foata normal form. 5753/105295 useless extension candidates. Maximal degree in co-relation 255917. Up to 69224 conditions per place. [2023-08-26 12:31:14,928 INFO L140 encePairwiseOnDemand]: 343/346 looper letters, 119 selfloop transitions, 5 changer transitions 0/142 dead transitions. [2023-08-26 12:31:14,928 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 83 places, 142 transitions, 661 flow [2023-08-26 12:31:14,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 12:31:14,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 12:31:14,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1098 transitions. [2023-08-26 12:31:14,931 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45334434351775393 [2023-08-26 12:31:14,931 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1098 transitions. [2023-08-26 12:31:14,932 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1098 transitions. [2023-08-26 12:31:14,932 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:31:14,932 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1098 transitions. [2023-08-26 12:31:14,934 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 156.85714285714286) internal successors, (1098), 7 states have internal predecessors, (1098), 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 12:31:14,937 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 346.0) internal successors, (2768), 8 states have internal predecessors, (2768), 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 12:31:14,938 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 346.0) internal successors, (2768), 8 states have internal predecessors, (2768), 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 12:31:14,938 INFO L175 Difference]: Start difference. First operand has 87 places, 78 transitions, 272 flow. Second operand 7 states and 1098 transitions. [2023-08-26 12:31:14,938 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 83 places, 142 transitions, 661 flow [2023-08-26 12:31:14,975 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 82 places, 142 transitions, 637 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-08-26 12:31:14,976 INFO L231 Difference]: Finished difference. Result has 82 places, 62 transitions, 207 flow [2023-08-26 12:31:14,976 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=346, PETRI_DIFFERENCE_MINUEND_FLOW=197, PETRI_DIFFERENCE_MINUEND_PLACES=76, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=62, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=207, PETRI_PLACES=82, PETRI_TRANSITIONS=62} [2023-08-26 12:31:14,977 INFO L281 CegarLoopForPetriNet]: 77 programPoint places, 5 predicate places. [2023-08-26 12:31:14,977 INFO L495 AbstractCegarLoop]: Abstraction has has 82 places, 62 transitions, 207 flow [2023-08-26 12:31:14,978 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 142.83333333333334) internal successors, (1714), 12 states have internal predecessors, (1714), 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 12:31:14,978 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:31:14,978 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 12:31:14,985 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 12:31:15,182 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,SelfDestructingSolverStorable16 [2023-08-26 12:31:15,183 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:31:15,183 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:31:15,183 INFO L85 PathProgramCache]: Analyzing trace with hash -562637155, now seen corresponding path program 1 times [2023-08-26 12:31:15,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:31:15,184 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52957106] [2023-08-26 12:31:15,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:31:15,184 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:31:15,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:31:15,368 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:31:15,368 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:31:15,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52957106] [2023-08-26 12:31:15,368 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52957106] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:31:15,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279877039] [2023-08-26 12:31:15,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:31:15,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:31:15,369 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:31:15,370 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 12:31:15,372 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 12:31:15,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:31:15,451 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 15 conjunts are in the unsatisfiable core [2023-08-26 12:31:15,452 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:31:15,459 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 12:31:15,584 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 12:31:15,585 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:31:15,717 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 12:31:15,717 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279877039] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:31:15,717 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:31:15,717 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2023-08-26 12:31:15,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37203077] [2023-08-26 12:31:15,717 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:31:15,718 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-08-26 12:31:15,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:31:15,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-08-26 12:31:15,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2023-08-26 12:31:15,720 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 146 out of 346 [2023-08-26 12:31:15,722 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 82 places, 62 transitions, 207 flow. Second operand has 17 states, 17 states have (on average 148.47058823529412) internal successors, (2524), 17 states have internal predecessors, (2524), 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 12:31:15,722 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:31:15,722 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 146 of 346 [2023-08-26 12:31:15,723 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:31:21,080 INFO L124 PetriNetUnfolderBase]: 53649/76513 cut-off events. [2023-08-26 12:31:21,080 INFO L125 PetriNetUnfolderBase]: For 93595/93595 co-relation queries the response was YES. [2023-08-26 12:31:21,343 INFO L83 FinitePrefix]: Finished finitePrefix Result has 185821 conditions, 76513 events. 53649/76513 cut-off events. For 93595/93595 co-relation queries the response was YES. Maximal size of possible extension queue 2178. Compared 553345 event pairs, 4734 based on Foata normal form. 5117/81339 useless extension candidates. Maximal degree in co-relation 185801. Up to 46146 conditions per place. [2023-08-26 12:31:21,581 INFO L140 encePairwiseOnDemand]: 343/346 looper letters, 118 selfloop transitions, 5 changer transitions 0/141 dead transitions. [2023-08-26 12:31:21,581 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 87 places, 141 transitions, 635 flow [2023-08-26 12:31:21,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 12:31:21,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 12:31:21,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1137 transitions. [2023-08-26 12:31:21,584 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4694467382328654 [2023-08-26 12:31:21,584 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1137 transitions. [2023-08-26 12:31:21,584 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1137 transitions. [2023-08-26 12:31:21,585 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:31:21,585 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1137 transitions. [2023-08-26 12:31:21,587 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 162.42857142857142) internal successors, (1137), 7 states have internal predecessors, (1137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:31:21,590 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 346.0) internal successors, (2768), 8 states have internal predecessors, (2768), 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 12:31:21,591 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 346.0) internal successors, (2768), 8 states have internal predecessors, (2768), 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 12:31:21,591 INFO L175 Difference]: Start difference. First operand has 82 places, 62 transitions, 207 flow. Second operand 7 states and 1137 transitions. [2023-08-26 12:31:21,591 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 87 places, 141 transitions, 635 flow [2023-08-26 12:31:21,609 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 78 places, 141 transitions, 616 flow, removed 0 selfloop flow, removed 9 redundant places. [2023-08-26 12:31:21,610 INFO L231 Difference]: Finished difference. Result has 78 places, 61 transitions, 188 flow [2023-08-26 12:31:21,610 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=346, PETRI_DIFFERENCE_MINUEND_FLOW=178, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=61, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=56, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=188, PETRI_PLACES=78, PETRI_TRANSITIONS=61} [2023-08-26 12:31:21,611 INFO L281 CegarLoopForPetriNet]: 77 programPoint places, 1 predicate places. [2023-08-26 12:31:21,611 INFO L495 AbstractCegarLoop]: Abstraction has has 78 places, 61 transitions, 188 flow [2023-08-26 12:31:21,612 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 148.47058823529412) internal successors, (2524), 17 states have internal predecessors, (2524), 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 12:31:21,612 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:31:21,612 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 12:31:21,620 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 12:31:21,816 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-08-26 12:31:21,817 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:31:21,817 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:31:21,817 INFO L85 PathProgramCache]: Analyzing trace with hash -261881419, now seen corresponding path program 1 times [2023-08-26 12:31:21,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:31:21,818 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484034235] [2023-08-26 12:31:21,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:31:21,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:31:21,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:31:21,832 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:31:21,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:31:21,862 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:31:21,862 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:31:21,863 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (5 of 6 remaining) [2023-08-26 12:31:21,863 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 6 remaining) [2023-08-26 12:31:21,863 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 6 remaining) [2023-08-26 12:31:21,863 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 6 remaining) [2023-08-26 12:31:21,863 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 6 remaining) [2023-08-26 12:31:21,864 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (0 of 6 remaining) [2023-08-26 12:31:21,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-08-26 12:31:21,864 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1] [2023-08-26 12:31:21,864 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:31:21,864 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-26 12:31:21,889 INFO L144 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2023-08-26 12:31:21,891 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 206 places, 236 transitions, 532 flow [2023-08-26 12:31:21,980 INFO L124 PetriNetUnfolderBase]: 146/978 cut-off events. [2023-08-26 12:31:21,980 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-26 12:31:21,989 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1089 conditions, 978 events. 146/978 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 4724 event pairs, 23 based on Foata normal form. 0/766 useless extension candidates. Maximal degree in co-relation 654. Up to 80 conditions per place. [2023-08-26 12:31:21,989 INFO L82 GeneralOperation]: Start removeDead. Operand has 206 places, 236 transitions, 532 flow [2023-08-26 12:31:21,994 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 206 places, 236 transitions, 532 flow [2023-08-26 12:31:21,994 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:31:21,994 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 206 places, 236 transitions, 532 flow [2023-08-26 12:31:21,994 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 206 places, 236 transitions, 532 flow [2023-08-26 12:31:21,994 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 206 places, 236 transitions, 532 flow [2023-08-26 12:31:22,253 INFO L124 PetriNetUnfolderBase]: 146/978 cut-off events. [2023-08-26 12:31:22,254 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-26 12:31:22,260 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1089 conditions, 978 events. 146/978 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 4724 event pairs, 23 based on Foata normal form. 0/766 useless extension candidates. Maximal degree in co-relation 654. Up to 80 conditions per place. [2023-08-26 12:31:22,284 INFO L119 LiptonReduction]: Number of co-enabled transitions 32200 [2023-08-26 12:31:25,243 INFO L134 LiptonReduction]: Checked pairs total: 97935 [2023-08-26 12:31:25,244 INFO L136 LiptonReduction]: Total number of compositions: 159 [2023-08-26 12:31:25,245 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:31:25,245 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;@79138053, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:31:25,246 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:31:25,246 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:31:25,246 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 12:31:25,247 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:31:25,247 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:31:25,247 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:31:25,247 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:31:25,247 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:31:25,247 INFO L85 PathProgramCache]: Analyzing trace with hash 59701, now seen corresponding path program 1 times [2023-08-26 12:31:25,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:31:25,247 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39871765] [2023-08-26 12:31:25,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:31:25,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:31:25,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:31:25,278 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 12:31:25,278 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:31:25,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [39871765] [2023-08-26 12:31:25,278 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [39871765] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:31:25,278 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:31:25,279 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:31:25,279 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902967976] [2023-08-26 12:31:25,279 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:31:25,279 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:31:25,279 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:31:25,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:31:25,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:31:25,280 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 168 out of 395 [2023-08-26 12:31:25,281 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 91 places, 118 transitions, 296 flow. Second operand has 3 states, 3 states have (on average 168.66666666666666) internal successors, (506), 3 states have internal predecessors, (506), 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 12:31:25,281 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:31:25,281 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 168 of 395 [2023-08-26 12:31:25,281 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand