/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf --traceabstraction.order.of.the.error.locations.to.be.checked PROGRAM_FIRST -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml --cacsl2boogietranslator.check.unreachability.of.reach_error.function false --cacsl2boogietranslator.pointer.base.address.is.valid.at.dereference ASSERTandASSUME --cacsl2boogietranslator.pointer.to.allocated.memory.at.dereference ASSERTandASSUME --cacsl2boogietranslator.check.array.bounds.for.arrays.that.are.off.heap ASSERTandASSUME --cacsl2boogietranslator.check.if.freed.pointer.was.valid true --cacsl2boogietranslator.adapt.memory.model.on.pointer.casts.if.necessary true -i ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 18:52:34,465 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 18:52:34,525 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf [2023-08-26 18:52:34,529 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 18:52:34,529 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 18:52:34,552 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 18:52:34,552 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 18:52:34,552 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 18:52:34,553 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 18:52:34,556 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 18:52:34,556 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 18:52:34,556 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 18:52:34,556 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 18:52:34,557 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 18:52:34,557 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 18:52:34,557 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 18:52:34,557 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 18:52:34,557 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 18:52:34,558 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 18:52:34,558 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 18:52:34,558 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 18:52:34,558 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 18:52:34,559 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 18:52:34,559 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 18:52:34,559 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 18:52:34,559 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 18:52:34,559 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 18:52:34,560 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:52:34,560 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 18:52:34,560 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 18:52:34,561 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 18:52:34,561 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 18:52:34,561 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 18:52:34,561 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 18:52:34,561 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 18:52:34,561 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 18:52:34,799 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 18:52:34,818 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 18:52:34,820 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 18:52:34,820 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 18:52:34,821 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 18:52:34,823 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i [2023-08-26 18:52:35,788 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 18:52:35,991 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 18:52:35,991 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i [2023-08-26 18:52:36,007 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/188bbf4b5/b7cd448ba08d4327aec0091f125484ef/FLAG2ac71236b [2023-08-26 18:52:36,020 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/188bbf4b5/b7cd448ba08d4327aec0091f125484ef [2023-08-26 18:52:36,023 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 18:52:36,024 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 18:52:36,026 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 18:52:36,026 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 18:52:36,028 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 18:52:36,028 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,029 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61993002 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36, skipping insertion in model container [2023-08-26 18:52:36,029 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,065 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 18:52:36,297 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:52:36,307 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 18:52:36,330 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 18:52:36,331 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 18:52:36,348 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:52:36,380 INFO L206 MainTranslator]: Completed translation [2023-08-26 18:52:36,381 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36 WrapperNode [2023-08-26 18:52:36,381 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 18:52:36,382 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 18:52:36,382 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 18:52:36,382 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 18:52:36,386 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,409 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,429 INFO L138 Inliner]: procedures = 170, calls = 38, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 85 [2023-08-26 18:52:36,429 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 18:52:36,430 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 18:52:36,430 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 18:52:36,430 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 18:52:36,436 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,436 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,445 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,445 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,454 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,460 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,461 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,462 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,463 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 18:52:36,464 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 18:52:36,464 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 18:52:36,464 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 18:52:36,464 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36" (1/1) ... [2023-08-26 18:52:36,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:52:36,478 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:52:36,487 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-26 18:52:36,489 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-26 18:52:36,509 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 18:52:36,509 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 18:52:36,509 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 18:52:36,509 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 18:52:36,510 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 18:52:36,510 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 18:52:36,510 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 18:52:36,510 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 18:52:36,510 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 18:52:36,510 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 18:52:36,510 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 18:52:36,511 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-26 18:52:36,604 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 18:52:36,605 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 18:52:36,818 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 18:52:36,822 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 18:52:36,823 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-08-26 18:52:36,824 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:52:36 BoogieIcfgContainer [2023-08-26 18:52:36,824 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 18:52:36,826 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 18:52:36,826 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 18:52:36,828 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 18:52:36,828 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 06:52:36" (1/3) ... [2023-08-26 18:52:36,828 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d3f3a03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:52:36, skipping insertion in model container [2023-08-26 18:52:36,828 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:52:36" (2/3) ... [2023-08-26 18:52:36,829 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d3f3a03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:52:36, skipping insertion in model container [2023-08-26 18:52:36,829 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:52:36" (3/3) ... [2023-08-26 18:52:36,829 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_36-indirect_racefree.i [2023-08-26 18:52:36,842 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 18:52:36,843 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 15 error locations. [2023-08-26 18:52:36,843 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 18:52:36,901 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 18:52:36,922 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 121 places, 131 transitions, 270 flow [2023-08-26 18:52:36,960 INFO L124 PetriNetUnfolderBase]: 19/178 cut-off events. [2023-08-26 18:52:36,960 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:52:36,970 INFO L83 FinitePrefix]: Finished finitePrefix Result has 184 conditions, 178 events. 19/178 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 535 event pairs, 0 based on Foata normal form. 0/134 useless extension candidates. Maximal degree in co-relation 92. Up to 4 conditions per place. [2023-08-26 18:52:36,970 INFO L82 GeneralOperation]: Start removeDead. Operand has 121 places, 131 transitions, 270 flow [2023-08-26 18:52:36,973 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 121 places, 131 transitions, 270 flow [2023-08-26 18:52:36,975 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:52:36,984 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 121 places, 131 transitions, 270 flow [2023-08-26 18:52:36,989 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 121 places, 131 transitions, 270 flow [2023-08-26 18:52:36,989 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 121 places, 131 transitions, 270 flow [2023-08-26 18:52:37,023 INFO L124 PetriNetUnfolderBase]: 19/178 cut-off events. [2023-08-26 18:52:37,024 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:52:37,025 INFO L83 FinitePrefix]: Finished finitePrefix Result has 184 conditions, 178 events. 19/178 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 535 event pairs, 0 based on Foata normal form. 0/134 useless extension candidates. Maximal degree in co-relation 92. Up to 4 conditions per place. [2023-08-26 18:52:37,028 INFO L119 LiptonReduction]: Number of co-enabled transitions 4240 [2023-08-26 18:52:39,855 INFO L134 LiptonReduction]: Checked pairs total: 8545 [2023-08-26 18:52:39,855 INFO L136 LiptonReduction]: Total number of compositions: 119 [2023-08-26 18:52:39,864 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:52:39,868 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;@2599faf0, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:52:39,868 INFO L358 AbstractCegarLoop]: Starting to check reachability of 23 error locations. [2023-08-26 18:52:39,869 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:52:39,869 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:52:39,869 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:52:39,869 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:39,870 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:52:39,870 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 20 more)] === [2023-08-26 18:52:39,873 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:39,873 INFO L85 PathProgramCache]: Analyzing trace with hash 16223, now seen corresponding path program 1 times [2023-08-26 18:52:39,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:39,878 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044341915] [2023-08-26 18:52:39,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:39,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:39,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:40,109 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:40,110 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:52:40,110 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044341915] [2023-08-26 18:52:40,110 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044341915] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:52:40,111 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:52:40,111 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:52:40,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875870680] [2023-08-26 18:52:40,112 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:52:40,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:52:40,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:52:40,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:52:40,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:52:40,139 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 85 out of 250 [2023-08-26 18:52:40,142 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 42 places, 49 transitions, 106 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 18:52:40,143 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:52:40,143 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 85 of 250 [2023-08-26 18:52:40,144 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:52:40,267 INFO L124 PetriNetUnfolderBase]: 192/464 cut-off events. [2023-08-26 18:52:40,268 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:52:40,268 INFO L83 FinitePrefix]: Finished finitePrefix Result has 896 conditions, 464 events. 192/464 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 36. Compared 2364 event pairs, 165 based on Foata normal form. 17/322 useless extension candidates. Maximal degree in co-relation 862. Up to 407 conditions per place. [2023-08-26 18:52:40,271 INFO L140 encePairwiseOnDemand]: 235/250 looper letters, 44 selfloop transitions, 2 changer transitions 0/52 dead transitions. [2023-08-26 18:52:40,271 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 42 places, 52 transitions, 204 flow [2023-08-26 18:52:40,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:52:40,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:52:40,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 322 transitions. [2023-08-26 18:52:40,281 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42933333333333334 [2023-08-26 18:52:40,281 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 322 transitions. [2023-08-26 18:52:40,281 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 322 transitions. [2023-08-26 18:52:40,282 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:52:40,283 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 322 transitions. [2023-08-26 18:52:40,286 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 107.33333333333333) internal successors, (322), 3 states have internal predecessors, (322), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,289 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,289 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,290 INFO L175 Difference]: Start difference. First operand has 42 places, 49 transitions, 106 flow. Second operand 3 states and 322 transitions. [2023-08-26 18:52:40,291 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 42 places, 52 transitions, 204 flow [2023-08-26 18:52:40,293 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 42 places, 52 transitions, 204 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:52:40,294 INFO L231 Difference]: Finished difference. Result has 43 places, 38 transitions, 94 flow [2023-08-26 18:52:40,295 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=84, PETRI_DIFFERENCE_MINUEND_PLACES=40, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=38, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=36, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=94, PETRI_PLACES=43, PETRI_TRANSITIONS=38} [2023-08-26 18:52:40,297 INFO L281 CegarLoopForPetriNet]: 42 programPoint places, 1 predicate places. [2023-08-26 18:52:40,297 INFO L495 AbstractCegarLoop]: Abstraction has has 43 places, 38 transitions, 94 flow [2023-08-26 18:52:40,297 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 18:52:40,297 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:40,297 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:52:40,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 18:52:40,298 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 20 more)] === [2023-08-26 18:52:40,298 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:40,298 INFO L85 PathProgramCache]: Analyzing trace with hash 16222, now seen corresponding path program 1 times [2023-08-26 18:52:40,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:40,298 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833848699] [2023-08-26 18:52:40,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:40,299 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:40,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:40,341 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:40,342 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:52:40,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833848699] [2023-08-26 18:52:40,342 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [833848699] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:52:40,342 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:52:40,342 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:52:40,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329621849] [2023-08-26 18:52:40,342 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:52:40,343 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:52:40,343 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:52:40,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:52:40,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:52:40,344 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 90 out of 250 [2023-08-26 18:52:40,345 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 43 places, 38 transitions, 94 flow. Second operand has 3 states, 3 states have (on average 90.66666666666667) internal successors, (272), 3 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,345 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:52:40,345 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 90 of 250 [2023-08-26 18:52:40,345 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:52:40,422 INFO L124 PetriNetUnfolderBase]: 210/464 cut-off events. [2023-08-26 18:52:40,422 INFO L125 PetriNetUnfolderBase]: For 27/27 co-relation queries the response was YES. [2023-08-26 18:52:40,423 INFO L83 FinitePrefix]: Finished finitePrefix Result has 999 conditions, 464 events. 210/464 cut-off events. For 27/27 co-relation queries the response was YES. Maximal size of possible extension queue 32. Compared 2229 event pairs, 195 based on Foata normal form. 0/286 useless extension candidates. Maximal degree in co-relation 964. Up to 425 conditions per place. [2023-08-26 18:52:40,424 INFO L140 encePairwiseOnDemand]: 246/250 looper letters, 43 selfloop transitions, 2 changer transitions 3/51 dead transitions. [2023-08-26 18:52:40,424 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 43 places, 51 transitions, 216 flow [2023-08-26 18:52:40,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:52:40,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:52:40,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 320 transitions. [2023-08-26 18:52:40,426 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4266666666666667 [2023-08-26 18:52:40,426 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 320 transitions. [2023-08-26 18:52:40,426 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 320 transitions. [2023-08-26 18:52:40,427 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:52:40,427 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 320 transitions. [2023-08-26 18:52:40,428 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 106.66666666666667) internal successors, (320), 3 states have internal predecessors, (320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,429 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,429 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,429 INFO L175 Difference]: Start difference. First operand has 43 places, 38 transitions, 94 flow. Second operand 3 states and 320 transitions. [2023-08-26 18:52:40,429 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 43 places, 51 transitions, 216 flow [2023-08-26 18:52:40,430 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 41 places, 51 transitions, 212 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:52:40,431 INFO L231 Difference]: Finished difference. Result has 41 places, 36 transitions, 90 flow [2023-08-26 18:52:40,431 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=86, PETRI_DIFFERENCE_MINUEND_PLACES=39, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=36, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=90, PETRI_PLACES=41, PETRI_TRANSITIONS=36} [2023-08-26 18:52:40,431 INFO L281 CegarLoopForPetriNet]: 42 programPoint places, -1 predicate places. [2023-08-26 18:52:40,432 INFO L495 AbstractCegarLoop]: Abstraction has has 41 places, 36 transitions, 90 flow [2023-08-26 18:52:40,432 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 90.66666666666667) internal successors, (272), 3 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,432 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:40,432 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 18:52:40,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 18:52:40,432 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 20 more)] === [2023-08-26 18:52:40,432 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:40,433 INFO L85 PathProgramCache]: Analyzing trace with hash 483599700, now seen corresponding path program 1 times [2023-08-26 18:52:40,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:40,433 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140380412] [2023-08-26 18:52:40,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:40,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:40,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:40,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:40,544 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:52:40,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140380412] [2023-08-26 18:52:40,545 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1140380412] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:52:40,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328873023] [2023-08-26 18:52:40,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:40,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:52:40,546 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:52:40,549 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:52:40,552 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-26 18:52:40,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:40,605 INFO L262 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:52:40,608 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:52:40,660 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:52:40,705 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:40,706 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:52:40,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:40,746 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328873023] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:52:40,746 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:52:40,747 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:52:40,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195367713] [2023-08-26 18:52:40,747 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:52:40,747 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:52:40,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:52:40,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:52:40,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:52:40,749 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 85 out of 250 [2023-08-26 18:52:40,750 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 41 places, 36 transitions, 90 flow. Second operand has 8 states, 8 states have (on average 86.875) internal successors, (695), 8 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,750 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:52:40,750 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 85 of 250 [2023-08-26 18:52:40,751 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:52:40,809 INFO L124 PetriNetUnfolderBase]: 24/83 cut-off events. [2023-08-26 18:52:40,809 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:52:40,809 INFO L83 FinitePrefix]: Finished finitePrefix Result has 182 conditions, 83 events. 24/83 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 267 event pairs, 0 based on Foata normal form. 13/89 useless extension candidates. Maximal degree in co-relation 174. Up to 50 conditions per place. [2023-08-26 18:52:40,809 INFO L140 encePairwiseOnDemand]: 246/250 looper letters, 21 selfloop transitions, 2 changer transitions 6/35 dead transitions. [2023-08-26 18:52:40,810 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 35 transitions, 137 flow [2023-08-26 18:52:40,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:52:40,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:52:40,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 371 transitions. [2023-08-26 18:52:40,811 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.371 [2023-08-26 18:52:40,811 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 371 transitions. [2023-08-26 18:52:40,811 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 371 transitions. [2023-08-26 18:52:40,812 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:52:40,812 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 371 transitions. [2023-08-26 18:52:40,813 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 92.75) internal successors, (371), 4 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,815 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 250.0) internal successors, (1250), 5 states have internal predecessors, (1250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,816 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 250.0) internal successors, (1250), 5 states have internal predecessors, (1250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,816 INFO L175 Difference]: Start difference. First operand has 41 places, 36 transitions, 90 flow. Second operand 4 states and 371 transitions. [2023-08-26 18:52:40,816 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 35 transitions, 137 flow [2023-08-26 18:52:40,817 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 35 transitions, 134 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:52:40,817 INFO L231 Difference]: Finished difference. Result has 29 places, 19 transitions, 48 flow [2023-08-26 18:52:40,818 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=50, PETRI_DIFFERENCE_MINUEND_PLACES=26, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=22, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=48, PETRI_PLACES=29, PETRI_TRANSITIONS=19} [2023-08-26 18:52:40,818 INFO L281 CegarLoopForPetriNet]: 42 programPoint places, -13 predicate places. [2023-08-26 18:52:40,819 INFO L495 AbstractCegarLoop]: Abstraction has has 29 places, 19 transitions, 48 flow [2023-08-26 18:52:40,819 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 86.875) internal successors, (695), 8 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:40,819 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:40,819 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:52:40,827 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-08-26 18:52:41,024 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:52:41,025 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 20 more)] === [2023-08-26 18:52:41,025 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:41,025 INFO L85 PathProgramCache]: Analyzing trace with hash 2106670083, now seen corresponding path program 1 times [2023-08-26 18:52:41,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:41,025 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986579409] [2023-08-26 18:52:41,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:41,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:41,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:41,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:41,098 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:52:41,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986579409] [2023-08-26 18:52:41,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986579409] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:52:41,099 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:52:41,099 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:52:41,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792466780] [2023-08-26 18:52:41,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:52:41,099 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:52:41,099 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:52:41,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:52:41,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:52:41,100 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 85 out of 250 [2023-08-26 18:52:41,101 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 19 transitions, 48 flow. Second operand has 4 states, 4 states have (on average 86.25) internal successors, (345), 4 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:41,101 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:52:41,101 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 85 of 250 [2023-08-26 18:52:41,101 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:52:41,117 INFO L124 PetriNetUnfolderBase]: 20/61 cut-off events. [2023-08-26 18:52:41,117 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 18:52:41,118 INFO L83 FinitePrefix]: Finished finitePrefix Result has 139 conditions, 61 events. 20/61 cut-off events. For 10/10 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 145 event pairs, 20 based on Foata normal form. 2/52 useless extension candidates. Maximal degree in co-relation 131. Up to 55 conditions per place. [2023-08-26 18:52:41,118 INFO L140 encePairwiseOnDemand]: 247/250 looper letters, 13 selfloop transitions, 1 changer transitions 0/17 dead transitions. [2023-08-26 18:52:41,118 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 26 places, 17 transitions, 72 flow [2023-08-26 18:52:41,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:52:41,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:52:41,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 271 transitions. [2023-08-26 18:52:41,119 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.36133333333333334 [2023-08-26 18:52:41,119 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 271 transitions. [2023-08-26 18:52:41,119 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 271 transitions. [2023-08-26 18:52:41,120 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:52:41,120 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 271 transitions. [2023-08-26 18:52:41,120 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 90.33333333333333) internal successors, (271), 3 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:41,121 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:41,122 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:41,122 INFO L175 Difference]: Start difference. First operand has 29 places, 19 transitions, 48 flow. Second operand 3 states and 271 transitions. [2023-08-26 18:52:41,122 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 26 places, 17 transitions, 72 flow [2023-08-26 18:52:41,122 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 24 places, 17 transitions, 69 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:52:41,123 INFO L231 Difference]: Finished difference. Result has 24 places, 17 transitions, 43 flow [2023-08-26 18:52:41,123 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=41, PETRI_DIFFERENCE_MINUEND_PLACES=22, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=17, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=16, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=43, PETRI_PLACES=24, PETRI_TRANSITIONS=17} [2023-08-26 18:52:41,124 INFO L281 CegarLoopForPetriNet]: 42 programPoint places, -18 predicate places. [2023-08-26 18:52:41,124 INFO L495 AbstractCegarLoop]: Abstraction has has 24 places, 17 transitions, 43 flow [2023-08-26 18:52:41,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 86.25) internal successors, (345), 4 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:41,124 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:41,124 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:52:41,124 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 18:52:41,124 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 20 more)] === [2023-08-26 18:52:41,125 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:41,125 INFO L85 PathProgramCache]: Analyzing trace with hash 882260307, now seen corresponding path program 1 times [2023-08-26 18:52:41,126 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:41,126 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407551314] [2023-08-26 18:52:41,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:41,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:41,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:41,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:41,189 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:52:41,189 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407551314] [2023-08-26 18:52:41,189 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407551314] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:52:41,189 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:52:41,190 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:52:41,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754182295] [2023-08-26 18:52:41,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:52:41,190 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:52:41,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:52:41,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:52:41,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:52:41,191 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 84 out of 250 [2023-08-26 18:52:41,191 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 17 transitions, 43 flow. Second operand has 4 states, 4 states have (on average 85.25) internal successors, (341), 4 states have internal predecessors, (341), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:41,191 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:52:41,191 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 84 of 250 [2023-08-26 18:52:41,191 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:52:41,215 INFO L124 PetriNetUnfolderBase]: 12/40 cut-off events. [2023-08-26 18:52:41,215 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:52:41,215 INFO L83 FinitePrefix]: Finished finitePrefix Result has 93 conditions, 40 events. 12/40 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 67 event pairs, 12 based on Foata normal form. 3/41 useless extension candidates. Maximal degree in co-relation 85. Up to 35 conditions per place. [2023-08-26 18:52:41,215 INFO L140 encePairwiseOnDemand]: 245/250 looper letters, 0 selfloop transitions, 0 changer transitions 13/13 dead transitions. [2023-08-26 18:52:41,215 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 13 transitions, 55 flow [2023-08-26 18:52:41,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:52:41,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:52:41,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 266 transitions. [2023-08-26 18:52:41,216 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3546666666666667 [2023-08-26 18:52:41,216 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 266 transitions. [2023-08-26 18:52:41,217 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 266 transitions. [2023-08-26 18:52:41,217 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:52:41,217 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 266 transitions. [2023-08-26 18:52:41,217 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:41,218 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:41,219 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:41,219 INFO L175 Difference]: Start difference. First operand has 24 places, 17 transitions, 43 flow. Second operand 3 states and 266 transitions. [2023-08-26 18:52:41,219 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 13 transitions, 55 flow [2023-08-26 18:52:41,219 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 13 transitions, 54 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:52:41,219 INFO L231 Difference]: Finished difference. Result has 21 places, 0 transitions, 0 flow [2023-08-26 18:52:41,219 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=34, PETRI_DIFFERENCE_MINUEND_PLACES=19, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=13, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=21, PETRI_TRANSITIONS=0} [2023-08-26 18:52:41,220 INFO L281 CegarLoopForPetriNet]: 42 programPoint places, -21 predicate places. [2023-08-26 18:52:41,220 INFO L495 AbstractCegarLoop]: Abstraction has has 21 places, 0 transitions, 0 flow [2023-08-26 18:52:41,220 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 85.25) internal successors, (341), 4 states have internal predecessors, (341), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:41,222 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 23 remaining) [2023-08-26 18:52:41,222 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 23 remaining) [2023-08-26 18:52:41,222 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 23 remaining) [2023-08-26 18:52:41,222 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 23 remaining) [2023-08-26 18:52:41,222 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 23 remaining) [2023-08-26 18:52:41,223 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONASSERT (17 of 23 remaining) [2023-08-26 18:52:41,223 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 23 remaining) [2023-08-26 18:52:41,223 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 23 remaining) [2023-08-26 18:52:41,223 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 23 remaining) [2023-08-26 18:52:41,223 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 23 remaining) [2023-08-26 18:52:41,223 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 23 remaining) [2023-08-26 18:52:41,223 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 23 remaining) [2023-08-26 18:52:41,223 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 23 remaining) [2023-08-26 18:52:41,223 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 23 remaining) [2023-08-26 18:52:41,223 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 23 remaining) [2023-08-26 18:52:41,223 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 23 remaining) [2023-08-26 18:52:41,223 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 23 remaining) [2023-08-26 18:52:41,224 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 23 remaining) [2023-08-26 18:52:41,224 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 23 remaining) [2023-08-26 18:52:41,224 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 23 remaining) [2023-08-26 18:52:41,224 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 23 remaining) [2023-08-26 18:52:41,224 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 23 remaining) [2023-08-26 18:52:41,224 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 23 remaining) [2023-08-26 18:52:41,224 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 18:52:41,224 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2023-08-26 18:52:41,225 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:52:41,229 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 121 places, 131 transitions, 270 flow [2023-08-26 18:52:41,237 INFO L124 PetriNetUnfolderBase]: 19/178 cut-off events. [2023-08-26 18:52:41,238 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:52:41,238 INFO L83 FinitePrefix]: Finished finitePrefix Result has 184 conditions, 178 events. 19/178 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 535 event pairs, 0 based on Foata normal form. 0/134 useless extension candidates. Maximal degree in co-relation 92. Up to 4 conditions per place. [2023-08-26 18:52:41,238 INFO L82 GeneralOperation]: Start removeDead. Operand has 121 places, 131 transitions, 270 flow [2023-08-26 18:52:41,239 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 117 places, 126 transitions, 257 flow [2023-08-26 18:52:41,239 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:52:41,239 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 117 places, 126 transitions, 257 flow [2023-08-26 18:52:41,254 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 117 places, 126 transitions, 257 flow [2023-08-26 18:52:41,254 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 117 places, 126 transitions, 257 flow [2023-08-26 18:52:41,262 INFO L124 PetriNetUnfolderBase]: 18/173 cut-off events. [2023-08-26 18:52:41,262 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:52:41,263 INFO L83 FinitePrefix]: Finished finitePrefix Result has 178 conditions, 173 events. 18/173 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 517 event pairs, 0 based on Foata normal form. 0/129 useless extension candidates. Maximal degree in co-relation 92. Up to 4 conditions per place. [2023-08-26 18:52:41,264 INFO L119 LiptonReduction]: Number of co-enabled transitions 4240 [2023-08-26 18:52:43,792 INFO L134 LiptonReduction]: Checked pairs total: 9180 [2023-08-26 18:52:43,792 INFO L136 LiptonReduction]: Total number of compositions: 118 [2023-08-26 18:52:43,798 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:52:43,803 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;@2599faf0, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:52:43,803 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:52:43,807 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:52:43,807 INFO L124 PetriNetUnfolderBase]: 3/28 cut-off events. [2023-08-26 18:52:43,807 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:52:43,807 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:43,807 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 18:52:43,807 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:52:43,807 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:43,807 INFO L85 PathProgramCache]: Analyzing trace with hash 1320289133, now seen corresponding path program 1 times [2023-08-26 18:52:43,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:43,808 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984750713] [2023-08-26 18:52:43,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:43,808 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:43,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:52:43,817 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:52:43,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:52:43,837 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:52:43,837 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:52:43,837 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:52:43,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 18:52:43,838 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:52:43,838 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:52:43,838 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:52:43,838 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 18:52:43,881 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 18:52:43,886 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 173 transitions, 364 flow [2023-08-26 18:52:43,914 INFO L124 PetriNetUnfolderBase]: 34/294 cut-off events. [2023-08-26 18:52:43,914 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:52:43,916 INFO L83 FinitePrefix]: Finished finitePrefix Result has 308 conditions, 294 events. 34/294 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1051 event pairs, 0 based on Foata normal form. 0/217 useless extension candidates. Maximal degree in co-relation 180. Up to 8 conditions per place. [2023-08-26 18:52:43,916 INFO L82 GeneralOperation]: Start removeDead. Operand has 158 places, 173 transitions, 364 flow [2023-08-26 18:52:43,917 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 158 places, 173 transitions, 364 flow [2023-08-26 18:52:43,917 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:52:43,918 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 158 places, 173 transitions, 364 flow [2023-08-26 18:52:43,919 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 158 places, 173 transitions, 364 flow [2023-08-26 18:52:43,919 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 173 transitions, 364 flow [2023-08-26 18:52:43,937 INFO L124 PetriNetUnfolderBase]: 34/294 cut-off events. [2023-08-26 18:52:43,937 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:52:43,938 INFO L83 FinitePrefix]: Finished finitePrefix Result has 308 conditions, 294 events. 34/294 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1051 event pairs, 0 based on Foata normal form. 0/217 useless extension candidates. Maximal degree in co-relation 180. Up to 8 conditions per place. [2023-08-26 18:52:43,942 INFO L119 LiptonReduction]: Number of co-enabled transitions 12560 [2023-08-26 18:52:46,709 INFO L134 LiptonReduction]: Checked pairs total: 30792 [2023-08-26 18:52:46,709 INFO L136 LiptonReduction]: Total number of compositions: 150 [2023-08-26 18:52:46,713 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:52:46,715 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;@2599faf0, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:52:46,715 INFO L358 AbstractCegarLoop]: Starting to check reachability of 31 error locations. [2023-08-26 18:52:46,716 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:52:46,716 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:52:46,716 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:52:46,716 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:46,716 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:52:46,716 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-08-26 18:52:46,717 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:46,717 INFO L85 PathProgramCache]: Analyzing trace with hash 31716, now seen corresponding path program 1 times [2023-08-26 18:52:46,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:46,718 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992746868] [2023-08-26 18:52:46,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:46,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:46,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:46,737 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:46,737 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:52:46,737 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992746868] [2023-08-26 18:52:46,738 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [992746868] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:52:46,738 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:52:46,738 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:52:46,738 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311726856] [2023-08-26 18:52:46,738 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:52:46,739 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:52:46,739 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:52:46,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:52:46,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:52:46,740 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 116 out of 323 [2023-08-26 18:52:46,740 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 66 places, 78 transitions, 174 flow. Second operand has 3 states, 3 states have (on average 116.66666666666667) internal successors, (350), 3 states have internal predecessors, (350), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:46,740 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:52:46,740 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 116 of 323 [2023-08-26 18:52:46,740 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:52:47,410 INFO L124 PetriNetUnfolderBase]: 7278/11869 cut-off events. [2023-08-26 18:52:47,411 INFO L125 PetriNetUnfolderBase]: For 92/92 co-relation queries the response was YES. [2023-08-26 18:52:47,420 INFO L83 FinitePrefix]: Finished finitePrefix Result has 23434 conditions, 11869 events. 7278/11869 cut-off events. For 92/92 co-relation queries the response was YES. Maximal size of possible extension queue 461. Compared 80467 event pairs, 6750 based on Foata normal form. 501/7877 useless extension candidates. Maximal degree in co-relation 18029. Up to 10670 conditions per place. [2023-08-26 18:52:47,462 INFO L140 encePairwiseOnDemand]: 300/323 looper letters, 78 selfloop transitions, 2 changer transitions 0/87 dead transitions. [2023-08-26 18:52:47,462 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 62 places, 87 transitions, 352 flow [2023-08-26 18:52:47,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:52:47,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:52:47,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 465 transitions. [2023-08-26 18:52:47,464 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47987616099071206 [2023-08-26 18:52:47,464 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 465 transitions. [2023-08-26 18:52:47,464 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 465 transitions. [2023-08-26 18:52:47,464 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:52:47,464 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 465 transitions. [2023-08-26 18:52:47,465 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 155.0) internal successors, (465), 3 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:47,467 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 323.0) internal successors, (1292), 4 states have internal predecessors, (1292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:47,467 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 323.0) internal successors, (1292), 4 states have internal predecessors, (1292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:47,467 INFO L175 Difference]: Start difference. First operand has 66 places, 78 transitions, 174 flow. Second operand 3 states and 465 transitions. [2023-08-26 18:52:47,467 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 62 places, 87 transitions, 352 flow [2023-08-26 18:52:47,469 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 62 places, 87 transitions, 352 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:52:47,470 INFO L231 Difference]: Finished difference. Result has 62 places, 57 transitions, 136 flow [2023-08-26 18:52:47,471 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=323, PETRI_DIFFERENCE_MINUEND_FLOW=132, PETRI_DIFFERENCE_MINUEND_PLACES=60, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=57, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=136, PETRI_PLACES=62, PETRI_TRANSITIONS=57} [2023-08-26 18:52:47,471 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, -4 predicate places. [2023-08-26 18:52:47,472 INFO L495 AbstractCegarLoop]: Abstraction has has 62 places, 57 transitions, 136 flow [2023-08-26 18:52:47,472 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 116.66666666666667) internal successors, (350), 3 states have internal predecessors, (350), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:47,472 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:47,472 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:52:47,472 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-26 18:52:47,472 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-08-26 18:52:47,472 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:47,472 INFO L85 PathProgramCache]: Analyzing trace with hash 31715, now seen corresponding path program 1 times [2023-08-26 18:52:47,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:47,472 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699234775] [2023-08-26 18:52:47,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:47,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:47,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:47,506 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:47,507 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:52:47,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699234775] [2023-08-26 18:52:47,507 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699234775] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:52:47,507 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:52:47,507 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:52:47,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273437885] [2023-08-26 18:52:47,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:52:47,507 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:52:47,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:52:47,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:52:47,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:52:47,508 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 111 out of 323 [2023-08-26 18:52:47,508 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 62 places, 57 transitions, 136 flow. Second operand has 3 states, 3 states have (on average 111.66666666666667) internal successors, (335), 3 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:47,509 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:52:47,509 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 111 of 323 [2023-08-26 18:52:47,509 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:52:48,106 INFO L124 PetriNetUnfolderBase]: 6386/10613 cut-off events. [2023-08-26 18:52:48,106 INFO L125 PetriNetUnfolderBase]: For 247/247 co-relation queries the response was YES. [2023-08-26 18:52:48,114 INFO L83 FinitePrefix]: Finished finitePrefix Result has 21067 conditions, 10613 events. 6386/10613 cut-off events. For 247/247 co-relation queries the response was YES. Maximal size of possible extension queue 418. Compared 73159 event pairs, 3010 based on Foata normal form. 0/7242 useless extension candidates. Maximal degree in co-relation 19380. Up to 10067 conditions per place. [2023-08-26 18:52:48,141 INFO L140 encePairwiseOnDemand]: 319/323 looper letters, 62 selfloop transitions, 2 changer transitions 0/73 dead transitions. [2023-08-26 18:52:48,142 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 64 places, 73 transitions, 296 flow [2023-08-26 18:52:48,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:52:48,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:52:48,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 399 transitions. [2023-08-26 18:52:48,143 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4117647058823529 [2023-08-26 18:52:48,143 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 399 transitions. [2023-08-26 18:52:48,143 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 399 transitions. [2023-08-26 18:52:48,144 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:52:48,144 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 399 transitions. [2023-08-26 18:52:48,144 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 133.0) internal successors, (399), 3 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:48,145 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 323.0) internal successors, (1292), 4 states have internal predecessors, (1292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:48,146 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 323.0) internal successors, (1292), 4 states have internal predecessors, (1292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:48,146 INFO L175 Difference]: Start difference. First operand has 62 places, 57 transitions, 136 flow. Second operand 3 states and 399 transitions. [2023-08-26 18:52:48,146 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 64 places, 73 transitions, 296 flow [2023-08-26 18:52:48,152 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 62 places, 73 transitions, 292 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:52:48,154 INFO L231 Difference]: Finished difference. Result has 63 places, 58 transitions, 146 flow [2023-08-26 18:52:48,154 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=323, PETRI_DIFFERENCE_MINUEND_FLOW=132, PETRI_DIFFERENCE_MINUEND_PLACES=60, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=57, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=146, PETRI_PLACES=63, PETRI_TRANSITIONS=58} [2023-08-26 18:52:48,155 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, -3 predicate places. [2023-08-26 18:52:48,155 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 58 transitions, 146 flow [2023-08-26 18:52:48,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 111.66666666666667) internal successors, (335), 3 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:48,155 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:48,155 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:52:48,155 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 18:52:48,155 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-08-26 18:52:48,155 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:48,155 INFO L85 PathProgramCache]: Analyzing trace with hash -751213575, now seen corresponding path program 1 times [2023-08-26 18:52:48,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:48,157 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398989166] [2023-08-26 18:52:48,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:48,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:48,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:48,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:48,248 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:52:48,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398989166] [2023-08-26 18:52:48,248 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1398989166] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:52:48,249 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:52:48,249 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:52:48,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778953295] [2023-08-26 18:52:48,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:52:48,249 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:52:48,249 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:52:48,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:52:48,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:52:48,250 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 107 out of 323 [2023-08-26 18:52:48,250 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 58 transitions, 146 flow. Second operand has 4 states, 4 states have (on average 108.25) internal successors, (433), 4 states have internal predecessors, (433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:48,250 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:52:48,250 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 107 of 323 [2023-08-26 18:52:48,251 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:52:48,761 INFO L124 PetriNetUnfolderBase]: 5553/9081 cut-off events. [2023-08-26 18:52:48,761 INFO L125 PetriNetUnfolderBase]: For 497/497 co-relation queries the response was YES. [2023-08-26 18:52:48,769 INFO L83 FinitePrefix]: Finished finitePrefix Result has 18606 conditions, 9081 events. 5553/9081 cut-off events. For 497/497 co-relation queries the response was YES. Maximal size of possible extension queue 338. Compared 58095 event pairs, 5148 based on Foata normal form. 441/6423 useless extension candidates. Maximal degree in co-relation 18506. Up to 8179 conditions per place. [2023-08-26 18:52:48,792 INFO L140 encePairwiseOnDemand]: 317/323 looper letters, 71 selfloop transitions, 2 changer transitions 0/80 dead transitions. [2023-08-26 18:52:48,792 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 62 places, 80 transitions, 336 flow [2023-08-26 18:52:48,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:52:48,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:52:48,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 508 transitions. [2023-08-26 18:52:48,794 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3931888544891641 [2023-08-26 18:52:48,794 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 508 transitions. [2023-08-26 18:52:48,794 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 508 transitions. [2023-08-26 18:52:48,794 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:52:48,794 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 508 transitions. [2023-08-26 18:52:48,795 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 127.0) internal successors, (508), 4 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:48,797 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 323.0) internal successors, (1615), 5 states have internal predecessors, (1615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:48,797 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 323.0) internal successors, (1615), 5 states have internal predecessors, (1615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:48,797 INFO L175 Difference]: Start difference. First operand has 63 places, 58 transitions, 146 flow. Second operand 4 states and 508 transitions. [2023-08-26 18:52:48,797 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 62 places, 80 transitions, 336 flow [2023-08-26 18:52:48,798 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 80 transitions, 334 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:52:48,799 INFO L231 Difference]: Finished difference. Result has 61 places, 54 transitions, 140 flow [2023-08-26 18:52:48,800 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=323, PETRI_DIFFERENCE_MINUEND_FLOW=136, PETRI_DIFFERENCE_MINUEND_PLACES=58, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=54, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=52, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=140, PETRI_PLACES=61, PETRI_TRANSITIONS=54} [2023-08-26 18:52:48,802 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, -5 predicate places. [2023-08-26 18:52:48,802 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 54 transitions, 140 flow [2023-08-26 18:52:48,802 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 108.25) internal successors, (433), 4 states have internal predecessors, (433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:48,802 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:48,802 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:52:48,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 18:52:48,802 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-08-26 18:52:48,802 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:48,803 INFO L85 PathProgramCache]: Analyzing trace with hash -751415319, now seen corresponding path program 1 times [2023-08-26 18:52:48,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:48,803 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182667013] [2023-08-26 18:52:48,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:48,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:48,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:48,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:48,861 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:52:48,861 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182667013] [2023-08-26 18:52:48,861 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [182667013] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:52:48,861 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:52:48,861 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:52:48,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905987538] [2023-08-26 18:52:48,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:52:48,862 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:52:48,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:52:48,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:52:48,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:52:48,862 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 111 out of 323 [2023-08-26 18:52:48,863 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 54 transitions, 140 flow. Second operand has 4 states, 4 states have (on average 112.25) internal successors, (449), 4 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:48,863 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:52:48,863 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 111 of 323 [2023-08-26 18:52:48,863 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:52:49,254 INFO L124 PetriNetUnfolderBase]: 4454/7261 cut-off events. [2023-08-26 18:52:49,256 INFO L125 PetriNetUnfolderBase]: For 392/392 co-relation queries the response was YES. [2023-08-26 18:52:49,261 INFO L83 FinitePrefix]: Finished finitePrefix Result has 15011 conditions, 7261 events. 4454/7261 cut-off events. For 392/392 co-relation queries the response was YES. Maximal size of possible extension queue 279. Compared 48921 event pairs, 312 based on Foata normal form. 0/5366 useless extension candidates. Maximal degree in co-relation 13741. Up to 5736 conditions per place. [2023-08-26 18:52:49,275 INFO L140 encePairwiseOnDemand]: 319/323 looper letters, 78 selfloop transitions, 3 changer transitions 0/90 dead transitions. [2023-08-26 18:52:49,275 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 90 transitions, 372 flow [2023-08-26 18:52:49,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:52:49,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:52:49,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 526 transitions. [2023-08-26 18:52:49,277 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4071207430340557 [2023-08-26 18:52:49,277 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 526 transitions. [2023-08-26 18:52:49,277 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 526 transitions. [2023-08-26 18:52:49,277 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:52:49,277 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 526 transitions. [2023-08-26 18:52:49,278 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 131.5) internal successors, (526), 4 states have internal predecessors, (526), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,279 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 323.0) internal successors, (1615), 5 states have internal predecessors, (1615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,280 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 323.0) internal successors, (1615), 5 states have internal predecessors, (1615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,280 INFO L175 Difference]: Start difference. First operand has 61 places, 54 transitions, 140 flow. Second operand 4 states and 526 transitions. [2023-08-26 18:52:49,280 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 90 transitions, 372 flow [2023-08-26 18:52:49,286 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 90 transitions, 369 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:52:49,287 INFO L231 Difference]: Finished difference. Result has 61 places, 53 transitions, 139 flow [2023-08-26 18:52:49,287 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=323, PETRI_DIFFERENCE_MINUEND_FLOW=133, PETRI_DIFFERENCE_MINUEND_PLACES=58, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=53, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=50, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=139, PETRI_PLACES=61, PETRI_TRANSITIONS=53} [2023-08-26 18:52:49,288 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, -5 predicate places. [2023-08-26 18:52:49,288 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 53 transitions, 139 flow [2023-08-26 18:52:49,288 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 112.25) internal successors, (449), 4 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,288 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:49,288 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:52:49,288 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 18:52:49,288 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-08-26 18:52:49,289 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:49,289 INFO L85 PathProgramCache]: Analyzing trace with hash -1812786049, now seen corresponding path program 1 times [2023-08-26 18:52:49,289 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:49,289 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251277251] [2023-08-26 18:52:49,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:49,289 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:49,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:49,350 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:49,350 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:52:49,350 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251277251] [2023-08-26 18:52:49,350 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251277251] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:52:49,350 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:52:49,350 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:52:49,350 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920933372] [2023-08-26 18:52:49,350 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:52:49,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:52:49,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:52:49,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:52:49,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:52:49,351 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 106 out of 323 [2023-08-26 18:52:49,353 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 53 transitions, 139 flow. Second operand has 4 states, 4 states have (on average 107.5) internal successors, (430), 4 states have internal predecessors, (430), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,353 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:52:49,353 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 106 of 323 [2023-08-26 18:52:49,353 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:52:49,655 INFO L124 PetriNetUnfolderBase]: 2761/4852 cut-off events. [2023-08-26 18:52:49,655 INFO L125 PetriNetUnfolderBase]: For 507/507 co-relation queries the response was YES. [2023-08-26 18:52:49,660 INFO L83 FinitePrefix]: Finished finitePrefix Result has 10014 conditions, 4852 events. 2761/4852 cut-off events. For 507/507 co-relation queries the response was YES. Maximal size of possible extension queue 173. Compared 29942 event pairs, 2419 based on Foata normal form. 0/4127 useless extension candidates. Maximal degree in co-relation 7457. Up to 3900 conditions per place. [2023-08-26 18:52:49,669 INFO L140 encePairwiseOnDemand]: 305/323 looper letters, 66 selfloop transitions, 10 changer transitions 7/89 dead transitions. [2023-08-26 18:52:49,669 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 64 places, 89 transitions, 375 flow [2023-08-26 18:52:49,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:52:49,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:52:49,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 521 transitions. [2023-08-26 18:52:49,670 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.40325077399380804 [2023-08-26 18:52:49,671 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 521 transitions. [2023-08-26 18:52:49,671 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 521 transitions. [2023-08-26 18:52:49,671 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:52:49,671 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 521 transitions. [2023-08-26 18:52:49,672 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 130.25) internal successors, (521), 4 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,673 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 323.0) internal successors, (1615), 5 states have internal predecessors, (1615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,673 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 323.0) internal successors, (1615), 5 states have internal predecessors, (1615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,673 INFO L175 Difference]: Start difference. First operand has 61 places, 53 transitions, 139 flow. Second operand 4 states and 521 transitions. [2023-08-26 18:52:49,673 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 64 places, 89 transitions, 375 flow [2023-08-26 18:52:49,674 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 62 places, 89 transitions, 371 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:52:49,675 INFO L231 Difference]: Finished difference. Result has 65 places, 60 transitions, 233 flow [2023-08-26 18:52:49,675 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=323, PETRI_DIFFERENCE_MINUEND_FLOW=135, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=53, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=43, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=233, PETRI_PLACES=65, PETRI_TRANSITIONS=60} [2023-08-26 18:52:49,675 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, -1 predicate places. [2023-08-26 18:52:49,675 INFO L495 AbstractCegarLoop]: Abstraction has has 65 places, 60 transitions, 233 flow [2023-08-26 18:52:49,676 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 107.5) internal successors, (430), 4 states have internal predecessors, (430), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,676 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:49,676 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:52:49,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-08-26 18:52:49,676 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-08-26 18:52:49,676 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:49,676 INFO L85 PathProgramCache]: Analyzing trace with hash -1819037402, now seen corresponding path program 1 times [2023-08-26 18:52:49,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:49,676 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611793584] [2023-08-26 18:52:49,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:49,676 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:49,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:49,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:49,700 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:52:49,700 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611793584] [2023-08-26 18:52:49,700 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611793584] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:52:49,700 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145274026] [2023-08-26 18:52:49,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:49,700 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:52:49,700 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:52:49,701 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:52:49,703 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-26 18:52:49,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:49,757 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-26 18:52:49,758 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:52:49,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:49,768 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:52:49,781 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:49,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145274026] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:52:49,781 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:52:49,781 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2023-08-26 18:52:49,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134201863] [2023-08-26 18:52:49,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:52:49,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-08-26 18:52:49,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:52:49,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-08-26 18:52:49,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2023-08-26 18:52:49,782 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 141 out of 323 [2023-08-26 18:52:49,783 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 65 places, 60 transitions, 233 flow. Second operand has 6 states, 6 states have (on average 142.83333333333334) internal successors, (857), 6 states have internal predecessors, (857), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,783 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:52:49,783 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 141 of 323 [2023-08-26 18:52:49,783 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:52:49,857 INFO L124 PetriNetUnfolderBase]: 417/763 cut-off events. [2023-08-26 18:52:49,857 INFO L125 PetriNetUnfolderBase]: For 289/326 co-relation queries the response was YES. [2023-08-26 18:52:49,858 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1843 conditions, 763 events. 417/763 cut-off events. For 289/326 co-relation queries the response was YES. Maximal size of possible extension queue 38. Compared 3588 event pairs, 10 based on Foata normal form. 102/857 useless extension candidates. Maximal degree in co-relation 1835. Up to 508 conditions per place. [2023-08-26 18:52:49,858 INFO L140 encePairwiseOnDemand]: 320/323 looper letters, 0 selfloop transitions, 0 changer transitions 55/55 dead transitions. [2023-08-26 18:52:49,858 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 55 transitions, 259 flow [2023-08-26 18:52:49,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 18:52:49,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 18:52:49,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 755 transitions. [2023-08-26 18:52:49,860 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4674922600619195 [2023-08-26 18:52:49,860 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 755 transitions. [2023-08-26 18:52:49,860 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 755 transitions. [2023-08-26 18:52:49,860 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:52:49,860 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 755 transitions. [2023-08-26 18:52:49,861 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 151.0) internal successors, (755), 5 states have internal predecessors, (755), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,863 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 323.0) internal successors, (1938), 6 states have internal predecessors, (1938), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,863 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 323.0) internal successors, (1938), 6 states have internal predecessors, (1938), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,863 INFO L175 Difference]: Start difference. First operand has 65 places, 60 transitions, 233 flow. Second operand 5 states and 755 transitions. [2023-08-26 18:52:49,863 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 55 transitions, 259 flow [2023-08-26 18:52:49,864 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 55 transitions, 257 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:52:49,864 INFO L231 Difference]: Finished difference. Result has 43 places, 0 transitions, 0 flow [2023-08-26 18:52:49,864 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=323, PETRI_DIFFERENCE_MINUEND_FLOW=91, PETRI_DIFFERENCE_MINUEND_PLACES=39, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=43, PETRI_TRANSITIONS=0} [2023-08-26 18:52:49,865 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, -23 predicate places. [2023-08-26 18:52:49,865 INFO L495 AbstractCegarLoop]: Abstraction has has 43 places, 0 transitions, 0 flow [2023-08-26 18:52:49,865 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 142.83333333333334) internal successors, (857), 6 states have internal predecessors, (857), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:49,866 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (30 of 31 remaining) [2023-08-26 18:52:49,866 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (29 of 31 remaining) [2023-08-26 18:52:49,866 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (28 of 31 remaining) [2023-08-26 18:52:49,866 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (27 of 31 remaining) [2023-08-26 18:52:49,866 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (26 of 31 remaining) [2023-08-26 18:52:49,866 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (25 of 31 remaining) [2023-08-26 18:52:49,866 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (24 of 31 remaining) [2023-08-26 18:52:49,866 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 31 remaining) [2023-08-26 18:52:49,866 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 31 remaining) [2023-08-26 18:52:49,866 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 31 remaining) [2023-08-26 18:52:49,866 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONASSERT (7 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 31 remaining) [2023-08-26 18:52:49,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 31 remaining) [2023-08-26 18:52:49,868 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 31 remaining) [2023-08-26 18:52:49,868 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 31 remaining) [2023-08-26 18:52:49,868 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 31 remaining) [2023-08-26 18:52:49,875 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-26 18:52:50,072 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,SelfDestructingSolverStorable11 [2023-08-26 18:52:50,072 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2023-08-26 18:52:50,073 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:52:50,074 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 173 transitions, 364 flow [2023-08-26 18:52:50,091 INFO L124 PetriNetUnfolderBase]: 34/294 cut-off events. [2023-08-26 18:52:50,091 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:52:50,092 INFO L83 FinitePrefix]: Finished finitePrefix Result has 308 conditions, 294 events. 34/294 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1051 event pairs, 0 based on Foata normal form. 0/217 useless extension candidates. Maximal degree in co-relation 180. Up to 8 conditions per place. [2023-08-26 18:52:50,092 INFO L82 GeneralOperation]: Start removeDead. Operand has 158 places, 173 transitions, 364 flow [2023-08-26 18:52:50,093 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 158 places, 173 transitions, 364 flow [2023-08-26 18:52:50,093 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:52:50,093 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 158 places, 173 transitions, 364 flow [2023-08-26 18:52:50,093 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 158 places, 173 transitions, 364 flow [2023-08-26 18:52:50,093 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 173 transitions, 364 flow [2023-08-26 18:52:50,109 INFO L124 PetriNetUnfolderBase]: 34/294 cut-off events. [2023-08-26 18:52:50,110 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:52:50,110 INFO L83 FinitePrefix]: Finished finitePrefix Result has 308 conditions, 294 events. 34/294 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1051 event pairs, 0 based on Foata normal form. 0/217 useless extension candidates. Maximal degree in co-relation 180. Up to 8 conditions per place. [2023-08-26 18:52:50,115 INFO L119 LiptonReduction]: Number of co-enabled transitions 12560 [2023-08-26 18:52:52,864 INFO L134 LiptonReduction]: Checked pairs total: 31031 [2023-08-26 18:52:52,864 INFO L136 LiptonReduction]: Total number of compositions: 152 [2023-08-26 18:52:52,865 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:52:52,865 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;@2599faf0, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:52:52,865 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:52:52,869 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:52:52,869 INFO L124 PetriNetUnfolderBase]: 14/87 cut-off events. [2023-08-26 18:52:52,870 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 18:52:52,870 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:52,870 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 18:52:52,870 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:52:52,870 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:52,870 INFO L85 PathProgramCache]: Analyzing trace with hash 1681239654, now seen corresponding path program 1 times [2023-08-26 18:52:52,870 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:52,870 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422813678] [2023-08-26 18:52:52,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:52,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:52,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:52:52,883 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:52:52,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:52:52,896 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:52:52,896 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:52:52,896 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:52:52,896 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 18:52:52,896 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:52:52,897 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:52:52,897 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:52:52,897 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 18:52:52,920 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 18:52:52,922 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 195 places, 215 transitions, 460 flow [2023-08-26 18:52:52,951 INFO L124 PetriNetUnfolderBase]: 54/447 cut-off events. [2023-08-26 18:52:52,951 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:52:52,953 INFO L83 FinitePrefix]: Finished finitePrefix Result has 475 conditions, 447 events. 54/447 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 1757 event pairs, 1 based on Foata normal form. 0/329 useless extension candidates. Maximal degree in co-relation 302. Up to 16 conditions per place. [2023-08-26 18:52:52,953 INFO L82 GeneralOperation]: Start removeDead. Operand has 195 places, 215 transitions, 460 flow [2023-08-26 18:52:52,955 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 195 places, 215 transitions, 460 flow [2023-08-26 18:52:52,955 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:52:52,955 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 195 places, 215 transitions, 460 flow [2023-08-26 18:52:52,955 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 195 places, 215 transitions, 460 flow [2023-08-26 18:52:52,956 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 195 places, 215 transitions, 460 flow [2023-08-26 18:52:52,981 INFO L124 PetriNetUnfolderBase]: 54/447 cut-off events. [2023-08-26 18:52:52,981 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:52:52,983 INFO L83 FinitePrefix]: Finished finitePrefix Result has 475 conditions, 447 events. 54/447 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 1757 event pairs, 1 based on Foata normal form. 0/329 useless extension candidates. Maximal degree in co-relation 302. Up to 16 conditions per place. [2023-08-26 18:52:52,991 INFO L119 LiptonReduction]: Number of co-enabled transitions 24000 [2023-08-26 18:52:56,097 INFO L134 LiptonReduction]: Checked pairs total: 63745 [2023-08-26 18:52:56,097 INFO L136 LiptonReduction]: Total number of compositions: 177 [2023-08-26 18:52:56,098 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:52:56,098 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;@2599faf0, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:52:56,098 INFO L358 AbstractCegarLoop]: Starting to check reachability of 39 error locations. [2023-08-26 18:52:56,099 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:52:56,099 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:52:56,099 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:52:56,099 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:52:56,099 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:52:56,099 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-08-26 18:52:56,100 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:52:56,100 INFO L85 PathProgramCache]: Analyzing trace with hash 50454, now seen corresponding path program 1 times [2023-08-26 18:52:56,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:52:56,100 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926462741] [2023-08-26 18:52:56,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:52:56,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:52:56,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:52:56,113 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:52:56,114 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:52:56,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926462741] [2023-08-26 18:52:56,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1926462741] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:52:56,114 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:52:56,114 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:52:56,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711066598] [2023-08-26 18:52:56,114 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:52:56,114 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:52:56,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:52:56,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:52:56,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:52:56,115 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 142 out of 392 [2023-08-26 18:52:56,115 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 88 places, 104 transitions, 238 flow. Second operand has 3 states, 3 states have (on average 142.66666666666666) internal successors, (428), 3 states have internal predecessors, (428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:52:56,115 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:52:56,115 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 142 of 392 [2023-08-26 18:52:56,115 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:53:10,629 INFO L124 PetriNetUnfolderBase]: 205154/284269 cut-off events. [2023-08-26 18:53:10,629 INFO L125 PetriNetUnfolderBase]: For 3440/3440 co-relation queries the response was YES. [2023-08-26 18:53:10,982 INFO L83 FinitePrefix]: Finished finitePrefix Result has 568604 conditions, 284269 events. 205154/284269 cut-off events. For 3440/3440 co-relation queries the response was YES. Maximal size of possible extension queue 7033. Compared 2123934 event pairs, 190178 based on Foata normal form. 13384/185943 useless extension candidates. Maximal degree in co-relation 138894. Up to 261952 conditions per place. [2023-08-26 18:53:12,004 INFO L140 encePairwiseOnDemand]: 362/392 looper letters, 114 selfloop transitions, 2 changer transitions 0/123 dead transitions. [2023-08-26 18:53:12,005 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 82 places, 123 transitions, 508 flow [2023-08-26 18:53:12,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:53:12,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:53:12,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 594 transitions. [2023-08-26 18:53:12,006 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5051020408163265 [2023-08-26 18:53:12,007 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 594 transitions. [2023-08-26 18:53:12,007 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 594 transitions. [2023-08-26 18:53:12,007 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:53:12,007 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 594 transitions. [2023-08-26 18:53:12,008 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 198.0) internal successors, (594), 3 states have internal predecessors, (594), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:12,009 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 392.0) internal successors, (1568), 4 states have internal predecessors, (1568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:12,010 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 392.0) internal successors, (1568), 4 states have internal predecessors, (1568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:12,010 INFO L175 Difference]: Start difference. First operand has 88 places, 104 transitions, 238 flow. Second operand 3 states and 594 transitions. [2023-08-26 18:53:12,010 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 82 places, 123 transitions, 508 flow [2023-08-26 18:53:12,013 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 82 places, 123 transitions, 508 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:53:12,015 INFO L231 Difference]: Finished difference. Result has 82 places, 76 transitions, 186 flow [2023-08-26 18:53:12,015 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=392, PETRI_DIFFERENCE_MINUEND_FLOW=182, PETRI_DIFFERENCE_MINUEND_PLACES=80, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=76, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=74, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=186, PETRI_PLACES=82, PETRI_TRANSITIONS=76} [2023-08-26 18:53:12,016 INFO L281 CegarLoopForPetriNet]: 88 programPoint places, -6 predicate places. [2023-08-26 18:53:12,016 INFO L495 AbstractCegarLoop]: Abstraction has has 82 places, 76 transitions, 186 flow [2023-08-26 18:53:12,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 142.66666666666666) internal successors, (428), 3 states have internal predecessors, (428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:12,016 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:12,016 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:53:12,016 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-26 18:53:12,017 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-08-26 18:53:12,017 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:12,017 INFO L85 PathProgramCache]: Analyzing trace with hash 50456, now seen corresponding path program 1 times [2023-08-26 18:53:12,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:12,017 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901277303] [2023-08-26 18:53:12,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:12,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:12,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:12,045 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:12,045 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:53:12,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901277303] [2023-08-26 18:53:12,045 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901277303] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:53:12,045 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:53:12,045 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:53:12,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294978343] [2023-08-26 18:53:12,046 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:53:12,046 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:53:12,046 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:53:12,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:53:12,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:53:12,047 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 137 out of 392 [2023-08-26 18:53:12,048 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 82 places, 76 transitions, 186 flow. Second operand has 3 states, 3 states have (on average 137.66666666666666) internal successors, (413), 3 states have internal predecessors, (413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:12,048 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:53:12,048 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 137 of 392 [2023-08-26 18:53:12,048 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:53:22,611 INFO L124 PetriNetUnfolderBase]: 139867/200923 cut-off events. [2023-08-26 18:53:22,612 INFO L125 PetriNetUnfolderBase]: For 5968/5968 co-relation queries the response was YES. [2023-08-26 18:53:22,876 INFO L83 FinitePrefix]: Finished finitePrefix Result has 399617 conditions, 200923 events. 139867/200923 cut-off events. For 5968/5968 co-relation queries the response was YES. Maximal size of possible extension queue 5015. Compared 1551074 event pairs, 91115 based on Foata normal form. 0/141823 useless extension candidates. Maximal degree in co-relation 367542. Up to 193028 conditions per place. [2023-08-26 18:53:23,570 INFO L140 encePairwiseOnDemand]: 388/392 looper letters, 77 selfloop transitions, 2 changer transitions 0/92 dead transitions. [2023-08-26 18:53:23,570 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 84 places, 92 transitions, 376 flow [2023-08-26 18:53:23,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:53:23,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:53:23,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 492 transitions. [2023-08-26 18:53:23,572 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.41836734693877553 [2023-08-26 18:53:23,572 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 492 transitions. [2023-08-26 18:53:23,572 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 492 transitions. [2023-08-26 18:53:23,572 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:53:23,572 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 492 transitions. [2023-08-26 18:53:23,573 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 164.0) internal successors, (492), 3 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:23,574 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 392.0) internal successors, (1568), 4 states have internal predecessors, (1568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:23,575 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 392.0) internal successors, (1568), 4 states have internal predecessors, (1568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:23,575 INFO L175 Difference]: Start difference. First operand has 82 places, 76 transitions, 186 flow. Second operand 3 states and 492 transitions. [2023-08-26 18:53:23,575 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 84 places, 92 transitions, 376 flow [2023-08-26 18:53:23,938 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 82 places, 92 transitions, 372 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:53:23,939 INFO L231 Difference]: Finished difference. Result has 83 places, 77 transitions, 196 flow [2023-08-26 18:53:23,939 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=392, PETRI_DIFFERENCE_MINUEND_FLOW=182, PETRI_DIFFERENCE_MINUEND_PLACES=80, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=76, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=74, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=196, PETRI_PLACES=83, PETRI_TRANSITIONS=77} [2023-08-26 18:53:23,940 INFO L281 CegarLoopForPetriNet]: 88 programPoint places, -5 predicate places. [2023-08-26 18:53:23,940 INFO L495 AbstractCegarLoop]: Abstraction has has 83 places, 77 transitions, 196 flow [2023-08-26 18:53:23,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 137.66666666666666) internal successors, (413), 3 states have internal predecessors, (413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:23,940 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:23,940 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:53:23,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-26 18:53:23,940 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-08-26 18:53:23,941 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:23,941 INFO L85 PathProgramCache]: Analyzing trace with hash -606468370, now seen corresponding path program 1 times [2023-08-26 18:53:23,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:23,941 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246361782] [2023-08-26 18:53:23,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:23,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:23,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:23,989 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:23,990 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:53:23,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246361782] [2023-08-26 18:53:23,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [246361782] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:53:23,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373439340] [2023-08-26 18:53:23,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:23,990 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:53:23,990 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:53:23,993 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:53:23,995 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-08-26 18:53:24,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:24,042 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:53:24,043 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:53:24,050 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:53:24,088 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:24,088 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:53:24,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:24,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373439340] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:53:24,125 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:53:24,125 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:53:24,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676203676] [2023-08-26 18:53:24,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:53:24,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:53:24,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:53:24,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:53:24,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:53:24,128 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 137 out of 392 [2023-08-26 18:53:24,129 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 83 places, 77 transitions, 196 flow. Second operand has 8 states, 8 states have (on average 138.875) internal successors, (1111), 8 states have internal predecessors, (1111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:24,129 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:53:24,129 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 137 of 392 [2023-08-26 18:53:24,129 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:53:26,232 INFO L124 PetriNetUnfolderBase]: 24481/38677 cut-off events. [2023-08-26 18:53:26,232 INFO L125 PetriNetUnfolderBase]: For 13470/13470 co-relation queries the response was YES. [2023-08-26 18:53:26,283 INFO L83 FinitePrefix]: Finished finitePrefix Result has 87020 conditions, 38677 events. 24481/38677 cut-off events. For 13470/13470 co-relation queries the response was YES. Maximal size of possible extension queue 1278. Compared 300142 event pairs, 0 based on Foata normal form. 3375/34672 useless extension candidates. Maximal degree in co-relation 8581. Up to 23910 conditions per place. [2023-08-26 18:53:26,383 INFO L140 encePairwiseOnDemand]: 388/392 looper letters, 130 selfloop transitions, 4 changer transitions 0/146 dead transitions. [2023-08-26 18:53:26,383 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 146 transitions, 591 flow [2023-08-26 18:53:26,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:53:26,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:53:26,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 962 transitions. [2023-08-26 18:53:26,385 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.40901360544217685 [2023-08-26 18:53:26,385 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 962 transitions. [2023-08-26 18:53:26,385 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 962 transitions. [2023-08-26 18:53:26,385 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:53:26,385 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 962 transitions. [2023-08-26 18:53:26,387 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 160.33333333333334) internal successors, (962), 6 states have internal predecessors, (962), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:26,389 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 392.0) internal successors, (2744), 7 states have internal predecessors, (2744), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:26,389 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 392.0) internal successors, (2744), 7 states have internal predecessors, (2744), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:26,389 INFO L175 Difference]: Start difference. First operand has 83 places, 77 transitions, 196 flow. Second operand 6 states and 962 transitions. [2023-08-26 18:53:26,389 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 146 transitions, 591 flow [2023-08-26 18:53:26,401 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 146 transitions, 583 flow, removed 3 selfloop flow, removed 1 redundant places. [2023-08-26 18:53:26,402 INFO L231 Difference]: Finished difference. Result has 73 places, 61 transitions, 153 flow [2023-08-26 18:53:26,402 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=392, PETRI_DIFFERENCE_MINUEND_FLOW=141, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=60, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=153, PETRI_PLACES=73, PETRI_TRANSITIONS=61} [2023-08-26 18:53:26,402 INFO L281 CegarLoopForPetriNet]: 88 programPoint places, -15 predicate places. [2023-08-26 18:53:26,402 INFO L495 AbstractCegarLoop]: Abstraction has has 73 places, 61 transitions, 153 flow [2023-08-26 18:53:26,403 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 138.875) internal successors, (1111), 8 states have internal predecessors, (1111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:26,403 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:26,403 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:53:26,409 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-08-26 18:53:26,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:53:26,609 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-08-26 18:53:26,609 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:26,609 INFO L85 PathProgramCache]: Analyzing trace with hash -606237361, now seen corresponding path program 1 times [2023-08-26 18:53:26,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:26,609 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436369831] [2023-08-26 18:53:26,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:26,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:26,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:26,669 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:26,669 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:53:26,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436369831] [2023-08-26 18:53:26,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436369831] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:53:26,670 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:53:26,670 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:53:26,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479492167] [2023-08-26 18:53:26,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:53:26,670 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:53:26,670 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:53:26,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:53:26,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:53:26,671 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 129 out of 392 [2023-08-26 18:53:26,671 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 61 transitions, 153 flow. Second operand has 4 states, 4 states have (on average 130.25) internal successors, (521), 4 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:26,671 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:53:26,671 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 129 of 392 [2023-08-26 18:53:26,671 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:53:28,416 INFO L124 PetriNetUnfolderBase]: 24478/34846 cut-off events. [2023-08-26 18:53:28,417 INFO L125 PetriNetUnfolderBase]: For 10786/10786 co-relation queries the response was YES. [2023-08-26 18:53:28,450 INFO L83 FinitePrefix]: Finished finitePrefix Result has 76909 conditions, 34846 events. 24478/34846 cut-off events. For 10786/10786 co-relation queries the response was YES. Maximal size of possible extension queue 1038. Compared 220098 event pairs, 24478 based on Foata normal form. 723/27373 useless extension candidates. Maximal degree in co-relation 65479. Up to 34602 conditions per place. [2023-08-26 18:53:28,554 INFO L140 encePairwiseOnDemand]: 385/392 looper letters, 48 selfloop transitions, 1 changer transitions 0/55 dead transitions. [2023-08-26 18:53:28,554 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 69 places, 55 transitions, 239 flow [2023-08-26 18:53:28,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:53:28,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:53:28,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 440 transitions. [2023-08-26 18:53:28,556 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3741496598639456 [2023-08-26 18:53:28,556 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 440 transitions. [2023-08-26 18:53:28,556 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 440 transitions. [2023-08-26 18:53:28,556 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:53:28,556 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 440 transitions. [2023-08-26 18:53:28,557 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 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 18:53:28,558 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 392.0) internal successors, (1568), 4 states have internal predecessors, (1568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:28,558 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 392.0) internal successors, (1568), 4 states have internal predecessors, (1568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:28,558 INFO L175 Difference]: Start difference. First operand has 73 places, 61 transitions, 153 flow. Second operand 3 states and 440 transitions. [2023-08-26 18:53:28,558 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 69 places, 55 transitions, 239 flow [2023-08-26 18:53:28,564 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 66 places, 55 transitions, 230 flow, removed 2 selfloop flow, removed 3 redundant places. [2023-08-26 18:53:28,565 INFO L231 Difference]: Finished difference. Result has 66 places, 55 transitions, 134 flow [2023-08-26 18:53:28,565 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=392, PETRI_DIFFERENCE_MINUEND_FLOW=132, PETRI_DIFFERENCE_MINUEND_PLACES=64, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=55, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=54, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=134, PETRI_PLACES=66, PETRI_TRANSITIONS=55} [2023-08-26 18:53:28,565 INFO L281 CegarLoopForPetriNet]: 88 programPoint places, -22 predicate places. [2023-08-26 18:53:28,566 INFO L495 AbstractCegarLoop]: Abstraction has has 66 places, 55 transitions, 134 flow [2023-08-26 18:53:28,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 130.25) internal successors, (521), 4 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:28,566 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:28,566 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:53:28,566 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-26 18:53:28,566 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-08-26 18:53:28,566 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:28,566 INFO L85 PathProgramCache]: Analyzing trace with hash -1613489494, now seen corresponding path program 1 times [2023-08-26 18:53:28,566 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:28,566 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284690318] [2023-08-26 18:53:28,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:28,567 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:28,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:28,608 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:28,608 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:53:28,608 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284690318] [2023-08-26 18:53:28,608 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284690318] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:53:28,608 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:53:28,608 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:53:28,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545676018] [2023-08-26 18:53:28,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:53:28,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:53:28,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:53:28,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:53:28,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:53:28,609 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 128 out of 392 [2023-08-26 18:53:28,610 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 66 places, 55 transitions, 134 flow. Second operand has 4 states, 4 states have (on average 129.5) internal successors, (518), 4 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:28,610 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:53:28,610 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 128 of 392 [2023-08-26 18:53:28,610 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:53:29,453 INFO L124 PetriNetUnfolderBase]: 9282/13431 cut-off events. [2023-08-26 18:53:29,453 INFO L125 PetriNetUnfolderBase]: For 1682/1682 co-relation queries the response was YES. [2023-08-26 18:53:29,463 INFO L83 FinitePrefix]: Finished finitePrefix Result has 28426 conditions, 13431 events. 9282/13431 cut-off events. For 1682/1682 co-relation queries the response was YES. Maximal size of possible extension queue 365. Compared 75511 event pairs, 9282 based on Foata normal form. 0/13395 useless extension candidates. Maximal degree in co-relation 28416. Up to 13274 conditions per place. [2023-08-26 18:53:29,467 INFO L140 encePairwiseOnDemand]: 379/392 looper letters, 0 selfloop transitions, 0 changer transitions 43/43 dead transitions. [2023-08-26 18:53:29,467 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 56 places, 43 transitions, 184 flow [2023-08-26 18:53:29,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:53:29,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:53:29,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 431 transitions. [2023-08-26 18:53:29,469 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3664965986394558 [2023-08-26 18:53:29,469 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 431 transitions. [2023-08-26 18:53:29,469 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 431 transitions. [2023-08-26 18:53:29,469 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:53:29,469 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 431 transitions. [2023-08-26 18:53:29,470 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 143.66666666666666) internal successors, (431), 3 states have internal predecessors, (431), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:29,471 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 392.0) internal successors, (1568), 4 states have internal predecessors, (1568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:29,471 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 392.0) internal successors, (1568), 4 states have internal predecessors, (1568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:29,471 INFO L175 Difference]: Start difference. First operand has 66 places, 55 transitions, 134 flow. Second operand 3 states and 431 transitions. [2023-08-26 18:53:29,471 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 56 places, 43 transitions, 184 flow [2023-08-26 18:53:29,472 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 55 places, 43 transitions, 183 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:53:29,472 INFO L231 Difference]: Finished difference. Result has 55 places, 0 transitions, 0 flow [2023-08-26 18:53:29,473 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=392, PETRI_DIFFERENCE_MINUEND_FLOW=109, PETRI_DIFFERENCE_MINUEND_PLACES=53, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=43, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=43, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=55, PETRI_TRANSITIONS=0} [2023-08-26 18:53:29,473 INFO L281 CegarLoopForPetriNet]: 88 programPoint places, -33 predicate places. [2023-08-26 18:53:29,473 INFO L495 AbstractCegarLoop]: Abstraction has has 55 places, 0 transitions, 0 flow [2023-08-26 18:53:29,473 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 129.5) internal successors, (518), 4 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:29,473 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (38 of 39 remaining) [2023-08-26 18:53:29,473 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (37 of 39 remaining) [2023-08-26 18:53:29,473 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (36 of 39 remaining) [2023-08-26 18:53:29,473 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (35 of 39 remaining) [2023-08-26 18:53:29,473 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (34 of 39 remaining) [2023-08-26 18:53:29,473 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (33 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (32 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (31 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (30 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (29 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (28 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (27 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (26 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (25 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (24 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 39 remaining) [2023-08-26 18:53:29,474 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONASSERT (9 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 39 remaining) [2023-08-26 18:53:29,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 39 remaining) [2023-08-26 18:53:29,475 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-08-26 18:53:29,475 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2023-08-26 18:53:29,476 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:53:29,477 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 195 places, 215 transitions, 460 flow [2023-08-26 18:53:29,500 INFO L124 PetriNetUnfolderBase]: 54/447 cut-off events. [2023-08-26 18:53:29,500 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:53:29,502 INFO L83 FinitePrefix]: Finished finitePrefix Result has 475 conditions, 447 events. 54/447 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 1757 event pairs, 1 based on Foata normal form. 0/329 useless extension candidates. Maximal degree in co-relation 302. Up to 16 conditions per place. [2023-08-26 18:53:29,502 INFO L82 GeneralOperation]: Start removeDead. Operand has 195 places, 215 transitions, 460 flow [2023-08-26 18:53:29,503 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 195 places, 215 transitions, 460 flow [2023-08-26 18:53:29,503 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:53:29,503 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 195 places, 215 transitions, 460 flow [2023-08-26 18:53:29,503 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 195 places, 215 transitions, 460 flow [2023-08-26 18:53:29,503 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 195 places, 215 transitions, 460 flow [2023-08-26 18:53:29,525 INFO L124 PetriNetUnfolderBase]: 54/447 cut-off events. [2023-08-26 18:53:29,525 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:53:29,527 INFO L83 FinitePrefix]: Finished finitePrefix Result has 475 conditions, 447 events. 54/447 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 1757 event pairs, 1 based on Foata normal form. 0/329 useless extension candidates. Maximal degree in co-relation 302. Up to 16 conditions per place. [2023-08-26 18:53:29,532 INFO L119 LiptonReduction]: Number of co-enabled transitions 24000 [2023-08-26 18:53:32,654 INFO L134 LiptonReduction]: Checked pairs total: 70859 [2023-08-26 18:53:32,654 INFO L136 LiptonReduction]: Total number of compositions: 175 [2023-08-26 18:53:32,655 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:53:32,656 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;@2599faf0, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:53:32,656 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:53:32,662 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:53:32,662 INFO L124 PetriNetUnfolderBase]: 24/138 cut-off events. [2023-08-26 18:53:32,662 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 18:53:32,662 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:32,662 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 18:53:32,662 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:53:32,662 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:32,663 INFO L85 PathProgramCache]: Analyzing trace with hash 303697798, now seen corresponding path program 1 times [2023-08-26 18:53:32,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:32,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828246105] [2023-08-26 18:53:32,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:32,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:32,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:53:32,679 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:53:32,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:53:32,693 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:53:32,693 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:53:32,693 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:53:32,693 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-08-26 18:53:32,693 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:53:32,695 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:53:32,696 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:53:32,696 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 18:53:32,711 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 18:53:32,713 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 232 places, 257 transitions, 558 flow [2023-08-26 18:53:32,756 INFO L124 PetriNetUnfolderBase]: 86/676 cut-off events. [2023-08-26 18:53:32,756 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:53:32,760 INFO L83 FinitePrefix]: Finished finitePrefix Result has 731 conditions, 676 events. 86/676 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 20. Compared 2986 event pairs, 6 based on Foata normal form. 0/501 useless extension candidates. Maximal degree in co-relation 467. Up to 32 conditions per place. [2023-08-26 18:53:32,760 INFO L82 GeneralOperation]: Start removeDead. Operand has 232 places, 257 transitions, 558 flow [2023-08-26 18:53:32,763 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 232 places, 257 transitions, 558 flow [2023-08-26 18:53:32,764 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:53:32,764 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 232 places, 257 transitions, 558 flow [2023-08-26 18:53:32,764 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 232 places, 257 transitions, 558 flow [2023-08-26 18:53:32,764 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 232 places, 257 transitions, 558 flow [2023-08-26 18:53:32,807 INFO L124 PetriNetUnfolderBase]: 86/676 cut-off events. [2023-08-26 18:53:32,807 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:53:32,811 INFO L83 FinitePrefix]: Finished finitePrefix Result has 731 conditions, 676 events. 86/676 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 20. Compared 2986 event pairs, 6 based on Foata normal form. 0/501 useless extension candidates. Maximal degree in co-relation 467. Up to 32 conditions per place. [2023-08-26 18:53:32,822 INFO L119 LiptonReduction]: Number of co-enabled transitions 38880 [2023-08-26 18:53:36,136 INFO L134 LiptonReduction]: Checked pairs total: 124565 [2023-08-26 18:53:36,136 INFO L136 LiptonReduction]: Total number of compositions: 212 [2023-08-26 18:53:36,137 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:53:36,137 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;@2599faf0, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:53:36,137 INFO L358 AbstractCegarLoop]: Starting to check reachability of 47 error locations. [2023-08-26 18:53:36,138 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:53:36,138 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:53:36,138 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:53:36,138 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:36,138 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:53:36,138 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 44 more)] === [2023-08-26 18:53:36,138 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:36,138 INFO L85 PathProgramCache]: Analyzing trace with hash 72431, now seen corresponding path program 1 times [2023-08-26 18:53:36,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:36,138 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871481636] [2023-08-26 18:53:36,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:36,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:36,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:36,162 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:36,162 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:53:36,162 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871481636] [2023-08-26 18:53:36,162 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871481636] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:53:36,162 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:53:36,162 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:53:36,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925143141] [2023-08-26 18:53:36,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:53:36,163 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:53:36,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:53:36,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:53:36,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:53:36,163 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 168 out of 469 [2023-08-26 18:53:36,164 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 110 places, 131 transitions, 306 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 18:53:36,164 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:53:36,164 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 168 of 469 [2023-08-26 18:53:36,164 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand