/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml --cacsl2boogietranslator.check.unreachability.of.reach_error.function false --cacsl2boogietranslator.pointer.base.address.is.valid.at.dereference ASSERTandASSUME --cacsl2boogietranslator.pointer.to.allocated.memory.at.dereference ASSERTandASSUME --cacsl2boogietranslator.check.array.bounds.for.arrays.that.are.off.heap ASSERTandASSUME --cacsl2boogietranslator.check.if.freed.pointer.was.valid true --cacsl2boogietranslator.adapt.memory.model.on.pointer.casts.if.necessary true -i ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_22-deref_read_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 12:37:24,296 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 12:37:24,378 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf [2023-08-26 12:37:24,383 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 12:37:24,384 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 12:37:24,413 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 12:37:24,414 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 12:37:24,414 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 12:37:24,415 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 12:37:24,418 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 12:37:24,418 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 12:37:24,419 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 12:37:24,419 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 12:37:24,420 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 12:37:24,420 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 12:37:24,420 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 12:37:24,421 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 12:37:24,421 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 12:37:24,421 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 12:37:24,421 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 12:37:24,421 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 12:37:24,422 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 12:37:24,422 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 12:37:24,423 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 12:37:24,423 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 12:37:24,423 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 12:37:24,423 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 12:37:24,424 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 12:37:24,424 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 12:37:24,424 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 12:37:24,425 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 12:37:24,425 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 12:37:24,425 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 12:37:24,425 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 12:37:24,425 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 12:37:24,426 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 12:37:24,719 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 12:37:24,735 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 12:37:24,738 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 12:37:24,739 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 12:37:24,739 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 12:37:24,740 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_22-deref_read_racefree.i [2023-08-26 12:37:25,861 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 12:37:26,146 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 12:37:26,147 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_22-deref_read_racefree.i [2023-08-26 12:37:26,157 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d36d7d0e/db31141dfa52499eabf2b25ff6b5431d/FLAG645a38993 [2023-08-26 12:37:26,168 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d36d7d0e/db31141dfa52499eabf2b25ff6b5431d [2023-08-26 12:37:26,170 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 12:37:26,172 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 12:37:26,173 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 12:37:26,173 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 12:37:26,175 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 12:37:26,176 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,177 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fcaaf76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26, skipping insertion in model container [2023-08-26 12:37:26,177 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,210 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 12:37:26,532 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 12:37:26,546 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 12:37:26,573 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 12:37:26,575 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 12:37:26,603 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 12:37:26,644 INFO L206 MainTranslator]: Completed translation [2023-08-26 12:37:26,644 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26 WrapperNode [2023-08-26 12:37:26,645 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 12:37:26,646 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 12:37:26,646 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 12:37:26,646 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 12:37:26,651 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,677 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,702 INFO L138 Inliner]: procedures = 170, calls = 37, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 72 [2023-08-26 12:37:26,702 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 12:37:26,704 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 12:37:26,704 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 12:37:26,704 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 12:37:26,712 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,712 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,723 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,724 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,737 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,740 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,741 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,742 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,744 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 12:37:26,745 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 12:37:26,745 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 12:37:26,745 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 12:37:26,745 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26" (1/1) ... [2023-08-26 12:37:26,754 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 12:37:26,763 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:37:26,781 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-26 12:37:26,792 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-26 12:37:26,816 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 12:37:26,816 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 12:37:26,817 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 12:37:26,817 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 12:37:26,817 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 12:37:26,817 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 12:37:26,817 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 12:37:26,817 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 12:37:26,818 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 12:37:26,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 12:37:26,818 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 12:37:26,821 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-26 12:37:26,930 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 12:37:26,931 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 12:37:27,096 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 12:37:27,102 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 12:37:27,102 INFO L302 CfgBuilder]: Removed 9 assume(true) statements. [2023-08-26 12:37:27,104 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 12:37:27 BoogieIcfgContainer [2023-08-26 12:37:27,104 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 12:37:27,106 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 12:37:27,106 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 12:37:27,109 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 12:37:27,109 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 12:37:26" (1/3) ... [2023-08-26 12:37:27,109 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d822065 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 12:37:27, skipping insertion in model container [2023-08-26 12:37:27,110 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:37:26" (2/3) ... [2023-08-26 12:37:27,110 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d822065 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 12:37:27, skipping insertion in model container [2023-08-26 12:37:27,110 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 12:37:27" (3/3) ... [2023-08-26 12:37:27,111 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_22-deref_read_racefree.i [2023-08-26 12:37:27,129 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 12:37:27,129 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 13 error locations. [2023-08-26 12:37:27,129 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 12:37:27,218 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 12:37:27,264 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 109 places, 117 transitions, 239 flow [2023-08-26 12:37:27,360 INFO L124 PetriNetUnfolderBase]: 16/157 cut-off events. [2023-08-26 12:37:27,360 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:37:27,366 INFO L83 FinitePrefix]: Finished finitePrefix Result has 162 conditions, 157 events. 16/157 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 432 event pairs, 0 based on Foata normal form. 0/121 useless extension candidates. Maximal degree in co-relation 85. Up to 4 conditions per place. [2023-08-26 12:37:27,366 INFO L82 GeneralOperation]: Start removeDead. Operand has 109 places, 117 transitions, 239 flow [2023-08-26 12:37:27,372 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 109 places, 117 transitions, 239 flow [2023-08-26 12:37:27,376 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:37:27,392 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 109 places, 117 transitions, 239 flow [2023-08-26 12:37:27,395 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 109 places, 117 transitions, 239 flow [2023-08-26 12:37:27,396 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 109 places, 117 transitions, 239 flow [2023-08-26 12:37:27,443 INFO L124 PetriNetUnfolderBase]: 16/157 cut-off events. [2023-08-26 12:37:27,443 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:37:27,444 INFO L83 FinitePrefix]: Finished finitePrefix Result has 162 conditions, 157 events. 16/157 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 432 event pairs, 0 based on Foata normal form. 0/121 useless extension candidates. Maximal degree in co-relation 85. Up to 4 conditions per place. [2023-08-26 12:37:27,447 INFO L119 LiptonReduction]: Number of co-enabled transitions 3680 [2023-08-26 12:37:30,500 INFO L134 LiptonReduction]: Checked pairs total: 8246 [2023-08-26 12:37:30,500 INFO L136 LiptonReduction]: Total number of compositions: 102 [2023-08-26 12:37:30,512 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:37:30,518 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;@22f74107, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:37:30,519 INFO L358 AbstractCegarLoop]: Starting to check reachability of 22 error locations. [2023-08-26 12:37:30,521 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:37:30,521 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 12:37:30,521 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:37:30,521 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:30,521 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:37:30,522 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 19 more)] === [2023-08-26 12:37:30,526 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:30,526 INFO L85 PathProgramCache]: Analyzing trace with hash 14497, now seen corresponding path program 1 times [2023-08-26 12:37:30,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:30,533 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944104668] [2023-08-26 12:37:30,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:30,534 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:30,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:30,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:30,829 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:37:30,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944104668] [2023-08-26 12:37:30,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944104668] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:37:30,830 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:37:30,830 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:37:30,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420530987] [2023-08-26 12:37:30,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:37:30,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:37:30,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:37:30,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:37:30,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:37:30,874 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 76 out of 219 [2023-08-26 12:37:30,876 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 39 places, 45 transitions, 95 flow. Second operand has 3 states, 3 states have (on average 76.66666666666667) internal successors, (230), 3 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:30,876 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:37:30,877 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 76 of 219 [2023-08-26 12:37:30,877 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:37:31,003 INFO L124 PetriNetUnfolderBase]: 169/409 cut-off events. [2023-08-26 12:37:31,003 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:37:31,006 INFO L83 FinitePrefix]: Finished finitePrefix Result has 784 conditions, 409 events. 169/409 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 27. Compared 1964 event pairs, 144 based on Foata normal form. 14/295 useless extension candidates. Maximal degree in co-relation 767. Up to 352 conditions per place. [2023-08-26 12:37:31,009 INFO L140 encePairwiseOnDemand]: 204/219 looper letters, 41 selfloop transitions, 2 changer transitions 0/49 dead transitions. [2023-08-26 12:37:31,010 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 39 places, 49 transitions, 189 flow [2023-08-26 12:37:31,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:37:31,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:37:31,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 292 transitions. [2023-08-26 12:37:31,031 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4444444444444444 [2023-08-26 12:37:31,031 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 292 transitions. [2023-08-26 12:37:31,032 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 292 transitions. [2023-08-26 12:37:31,034 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:37:31,036 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 292 transitions. [2023-08-26 12:37:31,040 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 97.33333333333333) internal successors, (292), 3 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,044 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 219.0) internal successors, (876), 4 states have internal predecessors, (876), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,045 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 219.0) internal successors, (876), 4 states have internal predecessors, (876), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,046 INFO L175 Difference]: Start difference. First operand has 39 places, 45 transitions, 95 flow. Second operand 3 states and 292 transitions. [2023-08-26 12:37:31,046 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 39 places, 49 transitions, 189 flow [2023-08-26 12:37:31,048 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 49 transitions, 189 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 12:37:31,050 INFO L231 Difference]: Finished difference. Result has 40 places, 34 transitions, 83 flow [2023-08-26 12:37:31,051 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=219, PETRI_DIFFERENCE_MINUEND_FLOW=73, PETRI_DIFFERENCE_MINUEND_PLACES=37, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=34, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=32, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=83, PETRI_PLACES=40, PETRI_TRANSITIONS=34} [2023-08-26 12:37:31,054 INFO L281 CegarLoopForPetriNet]: 39 programPoint places, 1 predicate places. [2023-08-26 12:37:31,054 INFO L495 AbstractCegarLoop]: Abstraction has has 40 places, 34 transitions, 83 flow [2023-08-26 12:37:31,055 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 76.66666666666667) internal successors, (230), 3 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,055 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:31,055 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:37:31,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 12:37:31,055 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 19 more)] === [2023-08-26 12:37:31,056 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:31,056 INFO L85 PathProgramCache]: Analyzing trace with hash 14496, now seen corresponding path program 1 times [2023-08-26 12:37:31,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:31,056 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220206343] [2023-08-26 12:37:31,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:31,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:31,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:31,094 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:31,094 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:37:31,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220206343] [2023-08-26 12:37:31,094 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220206343] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:37:31,095 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:37:31,095 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:37:31,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5050234] [2023-08-26 12:37:31,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:37:31,096 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:37:31,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:37:31,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:37:31,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:37:31,098 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 81 out of 219 [2023-08-26 12:37:31,098 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 40 places, 34 transitions, 83 flow. Second operand has 3 states, 3 states have (on average 81.66666666666667) internal successors, (245), 3 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,098 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:37:31,098 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 81 of 219 [2023-08-26 12:37:31,098 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:37:31,204 INFO L124 PetriNetUnfolderBase]: 192/428 cut-off events. [2023-08-26 12:37:31,205 INFO L125 PetriNetUnfolderBase]: For 29/29 co-relation queries the response was YES. [2023-08-26 12:37:31,206 INFO L83 FinitePrefix]: Finished finitePrefix Result has 923 conditions, 428 events. 192/428 cut-off events. For 29/29 co-relation queries the response was YES. Maximal size of possible extension queue 27. Compared 1973 event pairs, 160 based on Foata normal form. 0/280 useless extension candidates. Maximal degree in co-relation 901. Up to 349 conditions per place. [2023-08-26 12:37:31,208 INFO L140 encePairwiseOnDemand]: 216/219 looper letters, 41 selfloop transitions, 2 changer transitions 3/49 dead transitions. [2023-08-26 12:37:31,208 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 41 places, 49 transitions, 205 flow [2023-08-26 12:37:31,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:37:31,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:37:31,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 290 transitions. [2023-08-26 12:37:31,212 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.441400304414003 [2023-08-26 12:37:31,212 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 290 transitions. [2023-08-26 12:37:31,212 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 290 transitions. [2023-08-26 12:37:31,212 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:37:31,212 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 290 transitions. [2023-08-26 12:37:31,213 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 96.66666666666667) internal successors, (290), 3 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,215 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 219.0) internal successors, (876), 4 states have internal predecessors, (876), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,215 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 219.0) internal successors, (876), 4 states have internal predecessors, (876), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,215 INFO L175 Difference]: Start difference. First operand has 40 places, 34 transitions, 83 flow. Second operand 3 states and 290 transitions. [2023-08-26 12:37:31,215 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 41 places, 49 transitions, 205 flow [2023-08-26 12:37:31,216 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 49 transitions, 201 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:37:31,216 INFO L231 Difference]: Finished difference. Result has 39 places, 33 transitions, 81 flow [2023-08-26 12:37:31,216 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=219, PETRI_DIFFERENCE_MINUEND_FLOW=77, PETRI_DIFFERENCE_MINUEND_PLACES=37, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=33, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=81, PETRI_PLACES=39, PETRI_TRANSITIONS=33} [2023-08-26 12:37:31,217 INFO L281 CegarLoopForPetriNet]: 39 programPoint places, 0 predicate places. [2023-08-26 12:37:31,217 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 33 transitions, 81 flow [2023-08-26 12:37:31,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 81.66666666666667) internal successors, (245), 3 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,218 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:31,218 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 12:37:31,218 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 12:37:31,218 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 19 more)] === [2023-08-26 12:37:31,219 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:31,219 INFO L85 PathProgramCache]: Analyzing trace with hash 432143027, now seen corresponding path program 1 times [2023-08-26 12:37:31,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:31,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018483846] [2023-08-26 12:37:31,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:31,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:31,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:31,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:31,312 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:37:31,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018483846] [2023-08-26 12:37:31,312 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018483846] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:37:31,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107958325] [2023-08-26 12:37:31,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:31,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:37:31,313 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:37:31,315 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 12:37:31,319 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-26 12:37:31,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:31,381 INFO L262 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 12:37:31,384 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:37:31,449 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 12:37:31,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:31,493 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:37:31,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:31,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107958325] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:37:31,535 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:37:31,535 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 12:37:31,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965994145] [2023-08-26 12:37:31,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:37:31,536 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 12:37:31,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:37:31,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 12:37:31,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 12:37:31,538 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 76 out of 219 [2023-08-26 12:37:31,539 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 39 places, 33 transitions, 81 flow. Second operand has 8 states, 8 states have (on average 77.875) internal successors, (623), 8 states have internal predecessors, (623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,539 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:37:31,539 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 76 of 219 [2023-08-26 12:37:31,539 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:37:31,643 INFO L124 PetriNetUnfolderBase]: 26/82 cut-off events. [2023-08-26 12:37:31,643 INFO L125 PetriNetUnfolderBase]: For 12/12 co-relation queries the response was YES. [2023-08-26 12:37:31,643 INFO L83 FinitePrefix]: Finished finitePrefix Result has 176 conditions, 82 events. 26/82 cut-off events. For 12/12 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 205 event pairs, 12 based on Foata normal form. 14/87 useless extension candidates. Maximal degree in co-relation 168. Up to 54 conditions per place. [2023-08-26 12:37:31,644 INFO L140 encePairwiseOnDemand]: 215/219 looper letters, 29 selfloop transitions, 2 changer transitions 0/36 dead transitions. [2023-08-26 12:37:31,644 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 36 transitions, 143 flow [2023-08-26 12:37:31,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 12:37:31,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 12:37:31,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 337 transitions. [2023-08-26 12:37:31,646 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.384703196347032 [2023-08-26 12:37:31,646 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 337 transitions. [2023-08-26 12:37:31,646 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 337 transitions. [2023-08-26 12:37:31,646 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:37:31,647 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 337 transitions. [2023-08-26 12:37:31,648 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 84.25) internal successors, (337), 4 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,650 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 219.0) internal successors, (1095), 5 states have internal predecessors, (1095), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,650 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 219.0) internal successors, (1095), 5 states have internal predecessors, (1095), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,650 INFO L175 Difference]: Start difference. First operand has 39 places, 33 transitions, 81 flow. Second operand 4 states and 337 transitions. [2023-08-26 12:37:31,650 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 36 transitions, 143 flow [2023-08-26 12:37:31,651 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 36 transitions, 140 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:37:31,652 INFO L231 Difference]: Finished difference. Result has 29 places, 22 transitions, 54 flow [2023-08-26 12:37:31,652 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=219, 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=54, PETRI_PLACES=29, PETRI_TRANSITIONS=22} [2023-08-26 12:37:31,652 INFO L281 CegarLoopForPetriNet]: 39 programPoint places, -10 predicate places. [2023-08-26 12:37:31,653 INFO L495 AbstractCegarLoop]: Abstraction has has 29 places, 22 transitions, 54 flow [2023-08-26 12:37:31,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 77.875) internal successors, (623), 8 states have internal predecessors, (623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,653 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:31,653 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 12:37:31,669 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-08-26 12:37:31,860 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:37:31,860 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 19 more)] === [2023-08-26 12:37:31,861 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:31,861 INFO L85 PathProgramCache]: Analyzing trace with hash 511506913, now seen corresponding path program 1 times [2023-08-26 12:37:31,861 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:31,861 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704991798] [2023-08-26 12:37:31,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:31,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:31,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:31,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:31,970 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:37:31,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704991798] [2023-08-26 12:37:31,971 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704991798] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:37:31,971 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:37:31,972 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 12:37:31,972 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747470500] [2023-08-26 12:37:31,972 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:37:31,972 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 12:37:31,972 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:37:31,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 12:37:31,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 12:37:31,974 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 76 out of 219 [2023-08-26 12:37:31,975 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 22 transitions, 54 flow. Second operand has 4 states, 4 states have (on average 77.25) internal successors, (309), 4 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:31,975 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:37:31,975 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 76 of 219 [2023-08-26 12:37:31,975 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:37:32,007 INFO L124 PetriNetUnfolderBase]: 28/79 cut-off events. [2023-08-26 12:37:32,007 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-08-26 12:37:32,007 INFO L83 FinitePrefix]: Finished finitePrefix Result has 180 conditions, 79 events. 28/79 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 181 event pairs, 28 based on Foata normal form. 0/66 useless extension candidates. Maximal degree in co-relation 172. Up to 75 conditions per place. [2023-08-26 12:37:32,008 INFO L140 encePairwiseOnDemand]: 216/219 looper letters, 17 selfloop transitions, 1 changer transitions 0/20 dead transitions. [2023-08-26 12:37:32,008 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 20 transitions, 86 flow [2023-08-26 12:37:32,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:37:32,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:37:32,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 248 transitions. [2023-08-26 12:37:32,010 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3774733637747336 [2023-08-26 12:37:32,010 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 248 transitions. [2023-08-26 12:37:32,010 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 248 transitions. [2023-08-26 12:37:32,010 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:37:32,010 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 248 transitions. [2023-08-26 12:37:32,011 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 82.66666666666667) internal successors, (248), 3 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:32,012 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 219.0) internal successors, (876), 4 states have internal predecessors, (876), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:32,013 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 219.0) internal successors, (876), 4 states have internal predecessors, (876), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:32,013 INFO L175 Difference]: Start difference. First operand has 29 places, 22 transitions, 54 flow. Second operand 3 states and 248 transitions. [2023-08-26 12:37:32,013 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 20 transitions, 86 flow [2023-08-26 12:37:32,013 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 20 transitions, 83 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:37:32,014 INFO L231 Difference]: Finished difference. Result has 27 places, 20 transitions, 49 flow [2023-08-26 12:37:32,014 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=219, PETRI_DIFFERENCE_MINUEND_FLOW=47, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=49, PETRI_PLACES=27, PETRI_TRANSITIONS=20} [2023-08-26 12:37:32,015 INFO L281 CegarLoopForPetriNet]: 39 programPoint places, -12 predicate places. [2023-08-26 12:37:32,015 INFO L495 AbstractCegarLoop]: Abstraction has has 27 places, 20 transitions, 49 flow [2023-08-26 12:37:32,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 77.25) internal successors, (309), 4 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:32,016 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:32,016 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 12:37:32,016 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 12:37:32,016 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 19 more)] === [2023-08-26 12:37:32,019 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:32,019 INFO L85 PathProgramCache]: Analyzing trace with hash 511532208, now seen corresponding path program 1 times [2023-08-26 12:37:32,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:32,019 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784140978] [2023-08-26 12:37:32,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:32,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:32,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:37:32,041 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:37:32,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:37:32,076 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:37:32,076 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:37:32,077 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (21 of 22 remaining) [2023-08-26 12:37:32,078 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 22 remaining) [2023-08-26 12:37:32,078 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 22 remaining) [2023-08-26 12:37:32,079 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 22 remaining) [2023-08-26 12:37:32,079 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 22 remaining) [2023-08-26 12:37:32,079 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4ASSERT_VIOLATIONASSERT (16 of 22 remaining) [2023-08-26 12:37:32,079 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 22 remaining) [2023-08-26 12:37:32,079 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 22 remaining) [2023-08-26 12:37:32,079 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 22 remaining) [2023-08-26 12:37:32,080 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 22 remaining) [2023-08-26 12:37:32,080 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 22 remaining) [2023-08-26 12:37:32,080 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 22 remaining) [2023-08-26 12:37:32,080 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 22 remaining) [2023-08-26 12:37:32,080 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 22 remaining) [2023-08-26 12:37:32,080 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 22 remaining) [2023-08-26 12:37:32,081 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 22 remaining) [2023-08-26 12:37:32,081 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 22 remaining) [2023-08-26 12:37:32,081 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 22 remaining) [2023-08-26 12:37:32,081 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 22 remaining) [2023-08-26 12:37:32,081 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 22 remaining) [2023-08-26 12:37:32,081 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 22 remaining) [2023-08-26 12:37:32,082 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 22 remaining) [2023-08-26 12:37:32,082 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 12:37:32,082 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2023-08-26 12:37:32,084 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:37:32,084 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 12:37:32,102 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 12:37:32,105 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 146 places, 158 transitions, 328 flow [2023-08-26 12:37:32,127 INFO L124 PetriNetUnfolderBase]: 27/243 cut-off events. [2023-08-26 12:37:32,127 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 12:37:32,129 INFO L83 FinitePrefix]: Finished finitePrefix Result has 253 conditions, 243 events. 27/243 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 816 event pairs, 0 based on Foata normal form. 0/182 useless extension candidates. Maximal degree in co-relation 158. Up to 6 conditions per place. [2023-08-26 12:37:32,129 INFO L82 GeneralOperation]: Start removeDead. Operand has 146 places, 158 transitions, 328 flow [2023-08-26 12:37:32,131 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 146 places, 158 transitions, 328 flow [2023-08-26 12:37:32,131 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:37:32,131 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 146 places, 158 transitions, 328 flow [2023-08-26 12:37:32,131 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 146 places, 158 transitions, 328 flow [2023-08-26 12:37:32,131 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 146 places, 158 transitions, 328 flow [2023-08-26 12:37:32,152 INFO L124 PetriNetUnfolderBase]: 27/243 cut-off events. [2023-08-26 12:37:32,153 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 12:37:32,154 INFO L83 FinitePrefix]: Finished finitePrefix Result has 253 conditions, 243 events. 27/243 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 816 event pairs, 0 based on Foata normal form. 0/182 useless extension candidates. Maximal degree in co-relation 158. Up to 6 conditions per place. [2023-08-26 12:37:32,160 INFO L119 LiptonReduction]: Number of co-enabled transitions 10640 [2023-08-26 12:37:35,305 INFO L134 LiptonReduction]: Checked pairs total: 27757 [2023-08-26 12:37:35,305 INFO L136 LiptonReduction]: Total number of compositions: 136 [2023-08-26 12:37:35,307 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:37:35,308 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;@22f74107, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:37:35,308 INFO L358 AbstractCegarLoop]: Starting to check reachability of 30 error locations. [2023-08-26 12:37:35,309 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:37:35,310 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 12:37:35,310 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:37:35,310 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:35,316 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:37:35,317 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 27 more)] === [2023-08-26 12:37:35,317 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:35,317 INFO L85 PathProgramCache]: Analyzing trace with hash 25180, now seen corresponding path program 1 times [2023-08-26 12:37:35,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:35,318 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136995859] [2023-08-26 12:37:35,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:35,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:35,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:35,369 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:35,369 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:37:35,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136995859] [2023-08-26 12:37:35,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136995859] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:37:35,370 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:37:35,370 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:37:35,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320041888] [2023-08-26 12:37:35,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:37:35,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:37:35,371 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:37:35,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:37:35,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:37:35,372 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 102 out of 294 [2023-08-26 12:37:35,372 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 62 places, 72 transitions, 156 flow. Second operand has 3 states, 3 states have (on average 102.66666666666667) internal successors, (308), 3 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:35,373 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:37:35,373 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 102 of 294 [2023-08-26 12:37:35,373 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:37:36,167 INFO L124 PetriNetUnfolderBase]: 5447/9058 cut-off events. [2023-08-26 12:37:36,167 INFO L125 PetriNetUnfolderBase]: For 37/37 co-relation queries the response was YES. [2023-08-26 12:37:36,175 INFO L83 FinitePrefix]: Finished finitePrefix Result has 17702 conditions, 9058 events. 5447/9058 cut-off events. For 37/37 co-relation queries the response was YES. Maximal size of possible extension queue 418. Compared 62373 event pairs, 4990 based on Foata normal form. 420/6642 useless extension candidates. Maximal degree in co-relation 11884. Up to 8570 conditions per place. [2023-08-26 12:37:36,222 INFO L140 encePairwiseOnDemand]: 271/294 looper letters, 57 selfloop transitions, 2 changer transitions 0/69 dead transitions. [2023-08-26 12:37:36,222 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 69 transitions, 268 flow [2023-08-26 12:37:36,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:37:36,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:37:36,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 394 transitions. [2023-08-26 12:37:36,224 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4467120181405896 [2023-08-26 12:37:36,224 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 394 transitions. [2023-08-26 12:37:36,224 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 394 transitions. [2023-08-26 12:37:36,224 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:37:36,224 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 394 transitions. [2023-08-26 12:37:36,225 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 131.33333333333334) internal successors, (394), 3 states have internal predecessors, (394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:36,227 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 294.0) internal successors, (1176), 4 states have internal predecessors, (1176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:36,228 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 294.0) internal successors, (1176), 4 states have internal predecessors, (1176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:36,228 INFO L175 Difference]: Start difference. First operand has 62 places, 72 transitions, 156 flow. Second operand 3 states and 394 transitions. [2023-08-26 12:37:36,228 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 69 transitions, 268 flow [2023-08-26 12:37:36,229 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 60 places, 69 transitions, 266 flow, removed 1 selfloop flow, removed 0 redundant places. [2023-08-26 12:37:36,230 INFO L231 Difference]: Finished difference. Result has 61 places, 54 transitions, 130 flow [2023-08-26 12:37:36,230 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=294, PETRI_DIFFERENCE_MINUEND_FLOW=116, PETRI_DIFFERENCE_MINUEND_PLACES=58, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=53, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=51, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=130, PETRI_PLACES=61, PETRI_TRANSITIONS=54} [2023-08-26 12:37:36,233 INFO L281 CegarLoopForPetriNet]: 62 programPoint places, -1 predicate places. [2023-08-26 12:37:36,233 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 54 transitions, 130 flow [2023-08-26 12:37:36,233 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 102.66666666666667) internal successors, (308), 3 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:36,234 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:36,234 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:37:36,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 12:37:36,234 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 27 more)] === [2023-08-26 12:37:36,234 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:36,234 INFO L85 PathProgramCache]: Analyzing trace with hash 25181, now seen corresponding path program 1 times [2023-08-26 12:37:36,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:36,235 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035960856] [2023-08-26 12:37:36,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:36,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:36,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:36,259 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:36,260 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:37:36,260 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035960856] [2023-08-26 12:37:36,260 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035960856] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:37:36,260 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:37:36,260 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:37:36,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814095113] [2023-08-26 12:37:36,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:37:36,260 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:37:36,261 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:37:36,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:37:36,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:37:36,263 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 107 out of 294 [2023-08-26 12:37:36,264 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 54 transitions, 130 flow. Second operand has 3 states, 3 states have (on average 107.66666666666667) internal successors, (323), 3 states have internal predecessors, (323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:36,264 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:37:36,264 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 107 of 294 [2023-08-26 12:37:36,264 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:37:37,004 INFO L124 PetriNetUnfolderBase]: 6180/9969 cut-off events. [2023-08-26 12:37:37,004 INFO L125 PetriNetUnfolderBase]: For 584/584 co-relation queries the response was YES. [2023-08-26 12:37:37,021 INFO L83 FinitePrefix]: Finished finitePrefix Result has 20581 conditions, 9969 events. 6180/9969 cut-off events. For 584/584 co-relation queries the response was YES. Maximal size of possible extension queue 433. Compared 66339 event pairs, 5190 based on Foata normal form. 0/6685 useless extension candidates. Maximal degree in co-relation 20469. Up to 8184 conditions per place. [2023-08-26 12:37:37,066 INFO L140 encePairwiseOnDemand]: 291/294 looper letters, 74 selfloop transitions, 2 changer transitions 0/83 dead transitions. [2023-08-26 12:37:37,066 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 62 places, 83 transitions, 340 flow [2023-08-26 12:37:37,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:37:37,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:37:37,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 397 transitions. [2023-08-26 12:37:37,068 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4501133786848073 [2023-08-26 12:37:37,068 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 397 transitions. [2023-08-26 12:37:37,068 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 397 transitions. [2023-08-26 12:37:37,068 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:37:37,069 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 397 transitions. [2023-08-26 12:37:37,070 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 132.33333333333334) internal successors, (397), 3 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:37,071 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 294.0) internal successors, (1176), 4 states have internal predecessors, (1176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:37,072 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 294.0) internal successors, (1176), 4 states have internal predecessors, (1176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:37,072 INFO L175 Difference]: Start difference. First operand has 61 places, 54 transitions, 130 flow. Second operand 3 states and 397 transitions. [2023-08-26 12:37:37,072 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 62 places, 83 transitions, 340 flow [2023-08-26 12:37:37,073 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 83 transitions, 338 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:37:37,075 INFO L231 Difference]: Finished difference. Result has 61 places, 53 transitions, 130 flow [2023-08-26 12:37:37,075 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=294, PETRI_DIFFERENCE_MINUEND_FLOW=126, 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=51, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=130, PETRI_PLACES=61, PETRI_TRANSITIONS=53} [2023-08-26 12:37:37,076 INFO L281 CegarLoopForPetriNet]: 62 programPoint places, -1 predicate places. [2023-08-26 12:37:37,076 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 53 transitions, 130 flow [2023-08-26 12:37:37,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 107.66666666666667) internal successors, (323), 3 states have internal predecessors, (323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:37,077 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:37,077 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 12:37:37,077 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-26 12:37:37,077 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 27 more)] === [2023-08-26 12:37:37,078 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:37,078 INFO L85 PathProgramCache]: Analyzing trace with hash 1800507897, now seen corresponding path program 1 times [2023-08-26 12:37:37,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:37,078 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3916756] [2023-08-26 12:37:37,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:37,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:37,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:37,186 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:37,187 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:37:37,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3916756] [2023-08-26 12:37:37,189 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3916756] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:37:37,189 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:37:37,189 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 12:37:37,189 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063510315] [2023-08-26 12:37:37,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:37:37,189 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 12:37:37,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:37:37,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 12:37:37,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 12:37:37,193 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 98 out of 294 [2023-08-26 12:37:37,193 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 53 transitions, 130 flow. Second operand has 4 states, 4 states have (on average 99.25) internal successors, (397), 4 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:37,193 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:37:37,193 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 98 of 294 [2023-08-26 12:37:37,194 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:37:37,704 INFO L124 PetriNetUnfolderBase]: 4706/7657 cut-off events. [2023-08-26 12:37:37,704 INFO L125 PetriNetUnfolderBase]: For 665/665 co-relation queries the response was YES. [2023-08-26 12:37:37,714 INFO L83 FinitePrefix]: Finished finitePrefix Result has 15991 conditions, 7657 events. 4706/7657 cut-off events. For 665/665 co-relation queries the response was YES. Maximal size of possible extension queue 316. Compared 48817 event pairs, 4329 based on Foata normal form. 377/5642 useless extension candidates. Maximal degree in co-relation 13411. Up to 6851 conditions per place. [2023-08-26 12:37:37,740 INFO L140 encePairwiseOnDemand]: 288/294 looper letters, 66 selfloop transitions, 2 changer transitions 0/75 dead transitions. [2023-08-26 12:37:37,740 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 75 transitions, 310 flow [2023-08-26 12:37:37,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 12:37:37,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 12:37:37,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 467 transitions. [2023-08-26 12:37:37,743 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.397108843537415 [2023-08-26 12:37:37,743 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 467 transitions. [2023-08-26 12:37:37,743 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 467 transitions. [2023-08-26 12:37:37,743 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:37:37,743 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 467 transitions. [2023-08-26 12:37:37,745 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 116.75) internal successors, (467), 4 states have internal predecessors, (467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:37,746 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 294.0) internal successors, (1470), 5 states have internal predecessors, (1470), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:37,747 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 294.0) internal successors, (1470), 5 states have internal predecessors, (1470), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:37,747 INFO L175 Difference]: Start difference. First operand has 61 places, 53 transitions, 130 flow. Second operand 4 states and 467 transitions. [2023-08-26 12:37:37,747 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 75 transitions, 310 flow [2023-08-26 12:37:37,751 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 58 places, 75 transitions, 306 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:37:37,753 INFO L231 Difference]: Finished difference. Result has 58 places, 49 transitions, 122 flow [2023-08-26 12:37:37,753 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=294, PETRI_DIFFERENCE_MINUEND_FLOW=118, PETRI_DIFFERENCE_MINUEND_PLACES=55, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=49, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=47, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=122, PETRI_PLACES=58, PETRI_TRANSITIONS=49} [2023-08-26 12:37:37,754 INFO L281 CegarLoopForPetriNet]: 62 programPoint places, -4 predicate places. [2023-08-26 12:37:37,754 INFO L495 AbstractCegarLoop]: Abstraction has has 58 places, 49 transitions, 122 flow [2023-08-26 12:37:37,754 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 99.25) internal successors, (397), 4 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:37,754 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:37,754 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 12:37:37,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 12:37:37,755 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 27 more)] === [2023-08-26 12:37:37,755 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:37,755 INFO L85 PathProgramCache]: Analyzing trace with hash 1800295631, now seen corresponding path program 1 times [2023-08-26 12:37:37,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:37,755 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891783367] [2023-08-26 12:37:37,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:37,755 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:37,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:37,832 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 12:37:37,832 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:37:37,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891783367] [2023-08-26 12:37:37,832 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [891783367] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:37:37,832 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:37:37,833 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 12:37:37,833 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898352925] [2023-08-26 12:37:37,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:37:37,833 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 12:37:37,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:37:37,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 12:37:37,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 12:37:37,834 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 102 out of 294 [2023-08-26 12:37:37,835 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 58 places, 49 transitions, 122 flow. Second operand has 4 states, 4 states have (on average 103.25) internal successors, (413), 4 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 12:37:37,835 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:37:37,835 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 102 of 294 [2023-08-26 12:37:37,835 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:37:38,233 INFO L124 PetriNetUnfolderBase]: 3421/5744 cut-off events. [2023-08-26 12:37:38,233 INFO L125 PetriNetUnfolderBase]: For 324/324 co-relation queries the response was YES. [2023-08-26 12:37:38,241 INFO L83 FinitePrefix]: Finished finitePrefix Result has 11745 conditions, 5744 events. 3421/5744 cut-off events. For 324/324 co-relation queries the response was YES. Maximal size of possible extension queue 257. Compared 39167 event pairs, 288 based on Foata normal form. 0/4471 useless extension candidates. Maximal degree in co-relation 10635. Up to 4195 conditions per place. [2023-08-26 12:37:38,257 INFO L140 encePairwiseOnDemand]: 290/294 looper letters, 70 selfloop transitions, 3 changer transitions 0/83 dead transitions. [2023-08-26 12:37:38,258 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 83 transitions, 334 flow [2023-08-26 12:37:38,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 12:37:38,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 12:37:38,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 482 transitions. [2023-08-26 12:37:38,260 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4098639455782313 [2023-08-26 12:37:38,260 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 482 transitions. [2023-08-26 12:37:38,260 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 482 transitions. [2023-08-26 12:37:38,260 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:37:38,260 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 482 transitions. [2023-08-26 12:37:38,261 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 120.5) internal successors, (482), 4 states have internal predecessors, (482), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:38,263 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 294.0) internal successors, (1470), 5 states have internal predecessors, (1470), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:38,263 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 294.0) internal successors, (1470), 5 states have internal predecessors, (1470), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:38,263 INFO L175 Difference]: Start difference. First operand has 58 places, 49 transitions, 122 flow. Second operand 4 states and 482 transitions. [2023-08-26 12:37:38,263 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 83 transitions, 334 flow [2023-08-26 12:37:38,273 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 58 places, 83 transitions, 331 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:37:38,274 INFO L231 Difference]: Finished difference. Result has 58 places, 48 transitions, 121 flow [2023-08-26 12:37:38,274 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=294, PETRI_DIFFERENCE_MINUEND_FLOW=115, PETRI_DIFFERENCE_MINUEND_PLACES=55, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=48, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=45, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=121, PETRI_PLACES=58, PETRI_TRANSITIONS=48} [2023-08-26 12:37:38,274 INFO L281 CegarLoopForPetriNet]: 62 programPoint places, -4 predicate places. [2023-08-26 12:37:38,275 INFO L495 AbstractCegarLoop]: Abstraction has has 58 places, 48 transitions, 121 flow [2023-08-26 12:37:38,275 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 103.25) internal successors, (413), 4 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 12:37:38,275 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:38,275 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 12:37:38,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 12:37:38,275 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 27 more)] === [2023-08-26 12:37:38,276 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:38,276 INFO L85 PathProgramCache]: Analyzing trace with hash -18834061, now seen corresponding path program 1 times [2023-08-26 12:37:38,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:38,276 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211243742] [2023-08-26 12:37:38,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:38,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:38,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:38,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:38,338 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:37:38,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211243742] [2023-08-26 12:37:38,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [211243742] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:37:38,339 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:37:38,339 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 12:37:38,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276712082] [2023-08-26 12:37:38,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:37:38,339 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 12:37:38,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:37:38,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 12:37:38,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 12:37:38,340 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 97 out of 294 [2023-08-26 12:37:38,341 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 58 places, 48 transitions, 121 flow. Second operand has 4 states, 4 states have (on average 98.25) internal successors, (393), 4 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:38,341 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:37:38,341 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 97 of 294 [2023-08-26 12:37:38,341 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:37:38,728 INFO L124 PetriNetUnfolderBase]: 2737/4739 cut-off events. [2023-08-26 12:37:38,728 INFO L125 PetriNetUnfolderBase]: For 476/476 co-relation queries the response was YES. [2023-08-26 12:37:38,735 INFO L83 FinitePrefix]: Finished finitePrefix Result has 10077 conditions, 4739 events. 2737/4739 cut-off events. For 476/476 co-relation queries the response was YES. Maximal size of possible extension queue 183. Compared 28879 event pairs, 1923 based on Foata normal form. 0/4147 useless extension candidates. Maximal degree in co-relation 7459. Up to 2893 conditions per place. [2023-08-26 12:37:38,746 INFO L140 encePairwiseOnDemand]: 276/294 looper letters, 63 selfloop transitions, 10 changer transitions 5/85 dead transitions. [2023-08-26 12:37:38,746 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 61 places, 85 transitions, 352 flow [2023-08-26 12:37:38,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 12:37:38,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 12:37:38,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 481 transitions. [2023-08-26 12:37:38,749 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.40901360544217685 [2023-08-26 12:37:38,749 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 481 transitions. [2023-08-26 12:37:38,749 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 481 transitions. [2023-08-26 12:37:38,749 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:37:38,749 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 481 transitions. [2023-08-26 12:37:38,750 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 120.25) internal successors, (481), 4 states have internal predecessors, (481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:38,752 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 294.0) internal successors, (1470), 5 states have internal predecessors, (1470), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:38,752 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 294.0) internal successors, (1470), 5 states have internal predecessors, (1470), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:38,752 INFO L175 Difference]: Start difference. First operand has 58 places, 48 transitions, 121 flow. Second operand 4 states and 481 transitions. [2023-08-26 12:37:38,752 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 61 places, 85 transitions, 352 flow [2023-08-26 12:37:38,753 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 59 places, 85 transitions, 348 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:37:38,754 INFO L231 Difference]: Finished difference. Result has 62 places, 56 transitions, 221 flow [2023-08-26 12:37:38,754 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=294, PETRI_DIFFERENCE_MINUEND_FLOW=117, PETRI_DIFFERENCE_MINUEND_PLACES=56, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=48, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=38, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=221, PETRI_PLACES=62, PETRI_TRANSITIONS=56} [2023-08-26 12:37:38,755 INFO L281 CegarLoopForPetriNet]: 62 programPoint places, 0 predicate places. [2023-08-26 12:37:38,755 INFO L495 AbstractCegarLoop]: Abstraction has has 62 places, 56 transitions, 221 flow [2023-08-26 12:37:38,755 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 98.25) internal successors, (393), 4 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:38,755 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:38,755 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 12:37:38,756 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 12:37:38,756 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 27 more)] === [2023-08-26 12:37:38,756 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:38,756 INFO L85 PathProgramCache]: Analyzing trace with hash -25408756, now seen corresponding path program 1 times [2023-08-26 12:37:38,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:38,756 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038497227] [2023-08-26 12:37:38,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:38,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:38,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:38,783 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:38,783 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:37:38,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038497227] [2023-08-26 12:37:38,783 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2038497227] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:37:38,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1815015066] [2023-08-26 12:37:38,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:38,784 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:37:38,784 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:37:38,785 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 12:37:38,814 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-26 12:37:38,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:38,860 INFO L262 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-26 12:37:38,860 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:37:38,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:38,870 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:37:38,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:38,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1815015066] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:37:38,886 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:37:38,886 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2023-08-26 12:37:38,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321529433] [2023-08-26 12:37:38,887 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:37:38,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-08-26 12:37:38,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:37:38,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-08-26 12:37:38,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2023-08-26 12:37:38,888 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 129 out of 294 [2023-08-26 12:37:38,889 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 62 places, 56 transitions, 221 flow. Second operand has 6 states, 6 states have (on average 130.83333333333334) internal successors, (785), 6 states have internal predecessors, (785), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:38,889 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:37:38,889 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 129 of 294 [2023-08-26 12:37:38,889 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:37:38,997 INFO L124 PetriNetUnfolderBase]: 452/887 cut-off events. [2023-08-26 12:37:38,997 INFO L125 PetriNetUnfolderBase]: For 350/367 co-relation queries the response was YES. [2023-08-26 12:37:38,999 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2152 conditions, 887 events. 452/887 cut-off events. For 350/367 co-relation queries the response was YES. Maximal size of possible extension queue 46. Compared 4498 event pairs, 89 based on Foata normal form. 108/983 useless extension candidates. Maximal degree in co-relation 2144. Up to 545 conditions per place. [2023-08-26 12:37:39,001 INFO L140 encePairwiseOnDemand]: 291/294 looper letters, 48 selfloop transitions, 3 changer transitions 0/58 dead transitions. [2023-08-26 12:37:39,001 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 46 places, 58 transitions, 277 flow [2023-08-26 12:37:39,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 12:37:39,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 12:37:39,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 698 transitions. [2023-08-26 12:37:39,004 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4748299319727891 [2023-08-26 12:37:39,004 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 698 transitions. [2023-08-26 12:37:39,004 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 698 transitions. [2023-08-26 12:37:39,004 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:37:39,004 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 698 transitions. [2023-08-26 12:37:39,006 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 139.6) internal successors, (698), 5 states have internal predecessors, (698), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:39,008 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 294.0) internal successors, (1764), 6 states have internal predecessors, (1764), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:39,008 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 294.0) internal successors, (1764), 6 states have internal predecessors, (1764), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:39,008 INFO L175 Difference]: Start difference. First operand has 62 places, 56 transitions, 221 flow. Second operand 5 states and 698 transitions. [2023-08-26 12:37:39,008 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 46 places, 58 transitions, 277 flow [2023-08-26 12:37:39,009 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 44 places, 58 transitions, 275 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:37:39,010 INFO L231 Difference]: Finished difference. Result has 44 places, 30 transitions, 101 flow [2023-08-26 12:37:39,010 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=294, PETRI_DIFFERENCE_MINUEND_FLOW=95, PETRI_DIFFERENCE_MINUEND_PLACES=40, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=101, PETRI_PLACES=44, PETRI_TRANSITIONS=30} [2023-08-26 12:37:39,011 INFO L281 CegarLoopForPetriNet]: 62 programPoint places, -18 predicate places. [2023-08-26 12:37:39,011 INFO L495 AbstractCegarLoop]: Abstraction has has 44 places, 30 transitions, 101 flow [2023-08-26 12:37:39,011 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 130.83333333333334) internal successors, (785), 6 states have internal predecessors, (785), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:39,011 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:39,011 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 12:37:39,020 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-26 12:37:39,216 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,SelfDestructingSolverStorable10 [2023-08-26 12:37:39,217 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 27 more)] === [2023-08-26 12:37:39,218 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:39,218 INFO L85 PathProgramCache]: Analyzing trace with hash 1415642282, now seen corresponding path program 1 times [2023-08-26 12:37:39,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:39,218 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690991537] [2023-08-26 12:37:39,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:39,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:39,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:37:39,233 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:37:39,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:37:39,249 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:37:39,249 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:37:39,249 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (29 of 30 remaining) [2023-08-26 12:37:39,249 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (28 of 30 remaining) [2023-08-26 12:37:39,249 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (27 of 30 remaining) [2023-08-26 12:37:39,249 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (26 of 30 remaining) [2023-08-26 12:37:39,249 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (25 of 30 remaining) [2023-08-26 12:37:39,250 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4ASSERT_VIOLATIONASSERT (24 of 30 remaining) [2023-08-26 12:37:39,250 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 30 remaining) [2023-08-26 12:37:39,250 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 30 remaining) [2023-08-26 12:37:39,250 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 30 remaining) [2023-08-26 12:37:39,250 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 30 remaining) [2023-08-26 12:37:39,250 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 30 remaining) [2023-08-26 12:37:39,250 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 30 remaining) [2023-08-26 12:37:39,250 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 30 remaining) [2023-08-26 12:37:39,251 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 30 remaining) [2023-08-26 12:37:39,251 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 30 remaining) [2023-08-26 12:37:39,251 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 30 remaining) [2023-08-26 12:37:39,251 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 30 remaining) [2023-08-26 12:37:39,251 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 30 remaining) [2023-08-26 12:37:39,251 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 30 remaining) [2023-08-26 12:37:39,251 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 30 remaining) [2023-08-26 12:37:39,251 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 30 remaining) [2023-08-26 12:37:39,251 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 30 remaining) [2023-08-26 12:37:39,251 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 30 remaining) [2023-08-26 12:37:39,252 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 30 remaining) [2023-08-26 12:37:39,252 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 30 remaining) [2023-08-26 12:37:39,252 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 30 remaining) [2023-08-26 12:37:39,252 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 30 remaining) [2023-08-26 12:37:39,252 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 30 remaining) [2023-08-26 12:37:39,252 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 30 remaining) [2023-08-26 12:37:39,252 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 30 remaining) [2023-08-26 12:37:39,252 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 12:37:39,252 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1] [2023-08-26 12:37:39,254 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:37:39,254 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 12:37:39,284 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 12:37:39,288 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 183 places, 199 transitions, 419 flow [2023-08-26 12:37:39,335 INFO L124 PetriNetUnfolderBase]: 38/329 cut-off events. [2023-08-26 12:37:39,335 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 12:37:39,338 INFO L83 FinitePrefix]: Finished finitePrefix Result has 345 conditions, 329 events. 38/329 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1200 event pairs, 0 based on Foata normal form. 0/243 useless extension candidates. Maximal degree in co-relation 247. Up to 8 conditions per place. [2023-08-26 12:37:39,338 INFO L82 GeneralOperation]: Start removeDead. Operand has 183 places, 199 transitions, 419 flow [2023-08-26 12:37:39,340 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 183 places, 199 transitions, 419 flow [2023-08-26 12:37:39,340 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:37:39,340 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 183 places, 199 transitions, 419 flow [2023-08-26 12:37:39,341 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 183 places, 199 transitions, 419 flow [2023-08-26 12:37:39,341 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 183 places, 199 transitions, 419 flow [2023-08-26 12:37:39,371 INFO L124 PetriNetUnfolderBase]: 38/329 cut-off events. [2023-08-26 12:37:39,372 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 12:37:39,374 INFO L83 FinitePrefix]: Finished finitePrefix Result has 345 conditions, 329 events. 38/329 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1200 event pairs, 0 based on Foata normal form. 0/243 useless extension candidates. Maximal degree in co-relation 247. Up to 8 conditions per place. [2023-08-26 12:37:39,386 INFO L119 LiptonReduction]: Number of co-enabled transitions 20880 [2023-08-26 12:37:42,805 INFO L134 LiptonReduction]: Checked pairs total: 58379 [2023-08-26 12:37:42,805 INFO L136 LiptonReduction]: Total number of compositions: 166 [2023-08-26 12:37:42,807 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:37:42,807 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;@22f74107, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:37:42,807 INFO L358 AbstractCegarLoop]: Starting to check reachability of 38 error locations. [2023-08-26 12:37:42,808 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:37:42,808 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 12:37:42,809 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:37:42,809 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:42,809 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:37:42,809 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-08-26 12:37:42,809 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:42,809 INFO L85 PathProgramCache]: Analyzing trace with hash 38214, now seen corresponding path program 1 times [2023-08-26 12:37:42,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:42,809 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232003387] [2023-08-26 12:37:42,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:42,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:42,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:42,845 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:42,845 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:37:42,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232003387] [2023-08-26 12:37:42,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [232003387] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:37:42,845 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:37:42,845 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:37:42,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278604883] [2023-08-26 12:37:42,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:37:42,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:37:42,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:37:42,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:37:42,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:37:42,847 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 128 out of 365 [2023-08-26 12:37:42,847 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 84 places, 97 transitions, 215 flow. Second operand has 3 states, 3 states have (on average 128.66666666666666) internal successors, (386), 3 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:42,847 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:37:42,847 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 128 of 365 [2023-08-26 12:37:42,847 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:37:53,769 INFO L124 PetriNetUnfolderBase]: 125791/178127 cut-off events. [2023-08-26 12:37:53,769 INFO L125 PetriNetUnfolderBase]: For 1364/1364 co-relation queries the response was YES. [2023-08-26 12:37:54,010 INFO L83 FinitePrefix]: Finished finitePrefix Result has 352147 conditions, 178127 events. 125791/178127 cut-off events. For 1364/1364 co-relation queries the response was YES. Maximal size of possible extension queue 5238. Compared 1362183 event pairs, 119481 based on Foata normal form. 9450/132242 useless extension candidates. Maximal degree in co-relation 153829. Up to 173027 conditions per place. [2023-08-26 12:37:54,722 INFO L140 encePairwiseOnDemand]: 335/365 looper letters, 73 selfloop transitions, 2 changer transitions 0/88 dead transitions. [2023-08-26 12:37:54,722 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 88 transitions, 347 flow [2023-08-26 12:37:54,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:37:54,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:37:54,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 495 transitions. [2023-08-26 12:37:54,725 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4520547945205479 [2023-08-26 12:37:54,725 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 495 transitions. [2023-08-26 12:37:54,725 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 495 transitions. [2023-08-26 12:37:54,725 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:37:54,725 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 495 transitions. [2023-08-26 12:37:54,727 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 165.0) internal successors, (495), 3 states have internal predecessors, (495), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:54,728 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 365.0) internal successors, (1460), 4 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:54,729 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 365.0) internal successors, (1460), 4 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:54,729 INFO L175 Difference]: Start difference. First operand has 84 places, 97 transitions, 215 flow. Second operand 3 states and 495 transitions. [2023-08-26 12:37:54,729 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 80 places, 88 transitions, 347 flow [2023-08-26 12:37:54,731 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 80 places, 88 transitions, 341 flow, removed 3 selfloop flow, removed 0 redundant places. [2023-08-26 12:37:54,733 INFO L231 Difference]: Finished difference. Result has 81 places, 72 transitions, 171 flow [2023-08-26 12:37:54,734 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=365, PETRI_DIFFERENCE_MINUEND_FLOW=157, PETRI_DIFFERENCE_MINUEND_PLACES=78, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=71, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=69, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=171, PETRI_PLACES=81, PETRI_TRANSITIONS=72} [2023-08-26 12:37:54,734 INFO L281 CegarLoopForPetriNet]: 84 programPoint places, -3 predicate places. [2023-08-26 12:37:54,734 INFO L495 AbstractCegarLoop]: Abstraction has has 81 places, 72 transitions, 171 flow [2023-08-26 12:37:54,734 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 128.66666666666666) internal successors, (386), 3 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:54,735 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:37:54,735 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:37:54,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 12:37:54,735 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-08-26 12:37:54,735 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:37:54,735 INFO L85 PathProgramCache]: Analyzing trace with hash 38213, now seen corresponding path program 1 times [2023-08-26 12:37:54,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:37:54,735 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204161402] [2023-08-26 12:37:54,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:37:54,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:37:54,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:37:54,754 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:37:54,754 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:37:54,754 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204161402] [2023-08-26 12:37:54,754 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204161402] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:37:54,754 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:37:54,754 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:37:54,756 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287691711] [2023-08-26 12:37:54,756 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:37:54,756 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:37:54,756 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:37:54,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:37:54,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:37:54,757 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 133 out of 365 [2023-08-26 12:37:54,758 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 81 places, 72 transitions, 171 flow. Second operand has 3 states, 3 states have (on average 133.66666666666666) internal successors, (401), 3 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:37:54,758 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:37:54,758 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 133 of 365 [2023-08-26 12:37:54,758 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:07,798 INFO L124 PetriNetUnfolderBase]: 152100/213119 cut-off events. [2023-08-26 12:38:07,799 INFO L125 PetriNetUnfolderBase]: For 9494/9494 co-relation queries the response was YES. [2023-08-26 12:38:08,158 INFO L83 FinitePrefix]: Finished finitePrefix Result has 435991 conditions, 213119 events. 152100/213119 cut-off events. For 9494/9494 co-relation queries the response was YES. Maximal size of possible extension queue 6291. Compared 1626425 event pairs, 128070 based on Foata normal form. 0/142921 useless extension candidates. Maximal degree in co-relation 435878. Up to 176120 conditions per place. [2023-08-26 12:38:08,834 INFO L140 encePairwiseOnDemand]: 362/365 looper letters, 105 selfloop transitions, 2 changer transitions 0/116 dead transitions. [2023-08-26 12:38:08,834 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 82 places, 116 transitions, 473 flow [2023-08-26 12:38:08,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:38:08,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:38:08,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 506 transitions. [2023-08-26 12:38:08,836 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4621004566210046 [2023-08-26 12:38:08,836 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 506 transitions. [2023-08-26 12:38:08,836 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 506 transitions. [2023-08-26 12:38:08,836 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:08,836 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 506 transitions. [2023-08-26 12:38:08,837 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 168.66666666666666) internal successors, (506), 3 states have internal predecessors, (506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:08,839 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 365.0) internal successors, (1460), 4 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:08,839 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 365.0) internal successors, (1460), 4 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:08,840 INFO L175 Difference]: Start difference. First operand has 81 places, 72 transitions, 171 flow. Second operand 3 states and 506 transitions. [2023-08-26 12:38:08,840 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 82 places, 116 transitions, 473 flow [2023-08-26 12:38:08,847 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 81 places, 116 transitions, 471 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:38:08,849 INFO L231 Difference]: Finished difference. Result has 81 places, 71 transitions, 171 flow [2023-08-26 12:38:08,849 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=365, PETRI_DIFFERENCE_MINUEND_FLOW=167, PETRI_DIFFERENCE_MINUEND_PLACES=79, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=71, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=69, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=171, PETRI_PLACES=81, PETRI_TRANSITIONS=71} [2023-08-26 12:38:08,850 INFO L281 CegarLoopForPetriNet]: 84 programPoint places, -3 predicate places. [2023-08-26 12:38:08,850 INFO L495 AbstractCegarLoop]: Abstraction has has 81 places, 71 transitions, 171 flow [2023-08-26 12:38:08,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 133.66666666666666) internal successors, (401), 3 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:08,851 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:08,851 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 12:38:08,851 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-26 12:38:08,851 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-08-26 12:38:08,851 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:08,851 INFO L85 PathProgramCache]: Analyzing trace with hash 960378223, now seen corresponding path program 1 times [2023-08-26 12:38:08,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:08,851 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503907538] [2023-08-26 12:38:08,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:08,852 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:08,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:08,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:08,923 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:08,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503907538] [2023-08-26 12:38:08,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503907538] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:38:08,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902737943] [2023-08-26 12:38:08,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:08,923 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:38:08,923 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:38:08,925 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 12:38:08,927 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-08-26 12:38:09,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:09,023 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 12:38:09,023 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:38:09,031 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 12:38:09,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:09,073 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:38:09,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:09,115 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902737943] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:38:09,115 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:38:09,115 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 12:38:09,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868591293] [2023-08-26 12:38:09,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:38:09,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 12:38:09,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:09,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 12:38:09,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 12:38:09,117 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 128 out of 365 [2023-08-26 12:38:09,118 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 81 places, 71 transitions, 171 flow. Second operand has 8 states, 8 states have (on average 129.875) internal successors, (1039), 8 states have internal predecessors, (1039), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:09,118 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:09,118 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 128 of 365 [2023-08-26 12:38:09,118 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:17,660 INFO L124 PetriNetUnfolderBase]: 107245/155007 cut-off events. [2023-08-26 12:38:17,660 INFO L125 PetriNetUnfolderBase]: For 6992/6992 co-relation queries the response was YES. [2023-08-26 12:38:17,939 INFO L83 FinitePrefix]: Finished finitePrefix Result has 316550 conditions, 155007 events. 107245/155007 cut-off events. For 6992/6992 co-relation queries the response was YES. Maximal size of possible extension queue 4757. Compared 1281719 event pairs, 180 based on Foata normal form. 15/115456 useless extension candidates. Maximal degree in co-relation 262955. Up to 113005 conditions per place. [2023-08-26 12:38:18,424 INFO L140 encePairwiseOnDemand]: 361/365 looper letters, 179 selfloop transitions, 6 changer transitions 0/198 dead transitions. [2023-08-26 12:38:18,424 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 85 places, 198 transitions, 797 flow [2023-08-26 12:38:18,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 12:38:18,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 12:38:18,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 957 transitions. [2023-08-26 12:38:18,427 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.436986301369863 [2023-08-26 12:38:18,427 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 957 transitions. [2023-08-26 12:38:18,427 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 957 transitions. [2023-08-26 12:38:18,428 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:18,428 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 957 transitions. [2023-08-26 12:38:18,430 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 159.5) internal successors, (957), 6 states have internal predecessors, (957), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:18,433 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 365.0) internal successors, (2555), 7 states have internal predecessors, (2555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:18,433 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 365.0) internal successors, (2555), 7 states have internal predecessors, (2555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:18,433 INFO L175 Difference]: Start difference. First operand has 81 places, 71 transitions, 171 flow. Second operand 6 states and 957 transitions. [2023-08-26 12:38:18,433 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 85 places, 198 transitions, 797 flow [2023-08-26 12:38:20,503 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 83 places, 198 transitions, 793 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:38:20,505 INFO L231 Difference]: Finished difference. Result has 83 places, 72 transitions, 183 flow [2023-08-26 12:38:20,505 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=365, PETRI_DIFFERENCE_MINUEND_FLOW=163, PETRI_DIFFERENCE_MINUEND_PLACES=78, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=66, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=183, PETRI_PLACES=83, PETRI_TRANSITIONS=72} [2023-08-26 12:38:20,505 INFO L281 CegarLoopForPetriNet]: 84 programPoint places, -1 predicate places. [2023-08-26 12:38:20,505 INFO L495 AbstractCegarLoop]: Abstraction has has 83 places, 72 transitions, 183 flow [2023-08-26 12:38:20,506 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 129.875) internal successors, (1039), 8 states have internal predecessors, (1039), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:20,506 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:20,506 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 12:38:20,510 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 12:38:20,706 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:38:20,707 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-08-26 12:38:20,707 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:20,707 INFO L85 PathProgramCache]: Analyzing trace with hash 960673149, now seen corresponding path program 1 times [2023-08-26 12:38:20,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:20,707 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624441585] [2023-08-26 12:38:20,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:20,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:20,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:20,816 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:20,817 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:20,817 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624441585] [2023-08-26 12:38:20,817 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624441585] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:20,817 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:20,817 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 12:38:20,817 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361557678] [2023-08-26 12:38:20,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:20,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 12:38:20,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:20,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 12:38:20,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 12:38:20,819 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 120 out of 365 [2023-08-26 12:38:20,819 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 83 places, 72 transitions, 183 flow. Second operand has 4 states, 4 states have (on average 121.25) internal successors, (485), 4 states have internal predecessors, (485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:20,819 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:20,820 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 120 of 365 [2023-08-26 12:38:20,820 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:27,979 INFO L124 PetriNetUnfolderBase]: 93392/131499 cut-off events. [2023-08-26 12:38:27,979 INFO L125 PetriNetUnfolderBase]: For 18218/18218 co-relation queries the response was YES. [2023-08-26 12:38:28,195 INFO L83 FinitePrefix]: Finished finitePrefix Result has 272668 conditions, 131499 events. 93392/131499 cut-off events. For 18218/18218 co-relation queries the response was YES. Maximal size of possible extension queue 3703. Compared 958098 event pairs, 85384 based on Foata normal form. 7395/100168 useless extension candidates. Maximal degree in co-relation 212907. Up to 117768 conditions per place. [2023-08-26 12:38:28,589 INFO L140 encePairwiseOnDemand]: 357/365 looper letters, 94 selfloop transitions, 2 changer transitions 0/105 dead transitions. [2023-08-26 12:38:28,589 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 105 transitions, 441 flow [2023-08-26 12:38:28,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 12:38:28,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 12:38:28,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 585 transitions. [2023-08-26 12:38:28,591 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4006849315068493 [2023-08-26 12:38:28,591 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 585 transitions. [2023-08-26 12:38:28,591 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 585 transitions. [2023-08-26 12:38:28,592 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:28,592 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 585 transitions. [2023-08-26 12:38:28,593 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 146.25) internal successors, (585), 4 states have internal predecessors, (585), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:28,595 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 365.0) internal successors, (1825), 5 states have internal predecessors, (1825), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:28,595 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 365.0) internal successors, (1825), 5 states have internal predecessors, (1825), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:28,595 INFO L175 Difference]: Start difference. First operand has 83 places, 72 transitions, 183 flow. Second operand 4 states and 585 transitions. [2023-08-26 12:38:28,595 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 80 places, 105 transitions, 441 flow [2023-08-26 12:38:28,605 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 77 places, 105 transitions, 426 flow, removed 4 selfloop flow, removed 3 redundant places. [2023-08-26 12:38:28,606 INFO L231 Difference]: Finished difference. Result has 77 places, 66 transitions, 160 flow [2023-08-26 12:38:28,606 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=365, PETRI_DIFFERENCE_MINUEND_FLOW=156, PETRI_DIFFERENCE_MINUEND_PLACES=74, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=66, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=64, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=160, PETRI_PLACES=77, PETRI_TRANSITIONS=66} [2023-08-26 12:38:28,607 INFO L281 CegarLoopForPetriNet]: 84 programPoint places, -7 predicate places. [2023-08-26 12:38:28,607 INFO L495 AbstractCegarLoop]: Abstraction has has 77 places, 66 transitions, 160 flow [2023-08-26 12:38:28,607 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 121.25) internal successors, (485), 4 states have internal predecessors, (485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:28,607 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:28,607 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 12:38:28,607 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-08-26 12:38:28,607 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-08-26 12:38:28,608 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:28,608 INFO L85 PathProgramCache]: Analyzing trace with hash -283906592, now seen corresponding path program 1 times [2023-08-26 12:38:28,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:28,608 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312356550] [2023-08-26 12:38:28,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:28,608 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:28,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:28,703 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:28,703 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:28,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312356550] [2023-08-26 12:38:28,703 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1312356550] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:28,704 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:28,704 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 12:38:28,704 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271207999] [2023-08-26 12:38:28,704 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:28,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 12:38:28,705 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:28,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 12:38:28,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-08-26 12:38:28,706 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 105 out of 365 [2023-08-26 12:38:28,707 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 77 places, 66 transitions, 160 flow. Second operand has 5 states, 5 states have (on average 106.0) internal successors, (530), 5 states have internal predecessors, (530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:28,707 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:28,707 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 105 of 365 [2023-08-26 12:38:28,707 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:33,266 INFO L124 PetriNetUnfolderBase]: 55162/82655 cut-off events. [2023-08-26 12:38:33,267 INFO L125 PetriNetUnfolderBase]: For 6955/6955 co-relation queries the response was YES. [2023-08-26 12:38:33,389 INFO L83 FinitePrefix]: Finished finitePrefix Result has 170653 conditions, 82655 events. 55162/82655 cut-off events. For 6955/6955 co-relation queries the response was YES. Maximal size of possible extension queue 2272. Compared 629285 event pairs, 37954 based on Foata normal form. 0/74215 useless extension candidates. Maximal degree in co-relation 134949. Up to 58232 conditions per place. [2023-08-26 12:38:33,568 INFO L140 encePairwiseOnDemand]: 338/365 looper letters, 125 selfloop transitions, 27 changer transitions 0/160 dead transitions. [2023-08-26 12:38:33,569 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 81 places, 160 transitions, 654 flow [2023-08-26 12:38:33,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 12:38:33,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 12:38:33,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 698 transitions. [2023-08-26 12:38:33,571 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.38246575342465755 [2023-08-26 12:38:33,571 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 698 transitions. [2023-08-26 12:38:33,571 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 698 transitions. [2023-08-26 12:38:33,571 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:33,571 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 698 transitions. [2023-08-26 12:38:33,573 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 139.6) internal successors, (698), 5 states have internal predecessors, (698), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:33,575 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 365.0) internal successors, (2190), 6 states have internal predecessors, (2190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:33,575 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 365.0) internal successors, (2190), 6 states have internal predecessors, (2190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:33,575 INFO L175 Difference]: Start difference. First operand has 77 places, 66 transitions, 160 flow. Second operand 5 states and 698 transitions. [2023-08-26 12:38:33,575 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 81 places, 160 transitions, 654 flow [2023-08-26 12:38:34,791 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 160 transitions, 650 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:38:34,793 INFO L231 Difference]: Finished difference. Result has 83 places, 91 transitions, 414 flow [2023-08-26 12:38:34,793 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=365, PETRI_DIFFERENCE_MINUEND_FLOW=157, PETRI_DIFFERENCE_MINUEND_PLACES=75, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=66, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=51, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=414, PETRI_PLACES=83, PETRI_TRANSITIONS=91} [2023-08-26 12:38:34,793 INFO L281 CegarLoopForPetriNet]: 84 programPoint places, -1 predicate places. [2023-08-26 12:38:34,793 INFO L495 AbstractCegarLoop]: Abstraction has has 83 places, 91 transitions, 414 flow [2023-08-26 12:38:34,794 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 106.0) internal successors, (530), 5 states have internal predecessors, (530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:34,794 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:34,794 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 12:38:34,794 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-26 12:38:34,794 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-08-26 12:38:34,795 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:34,795 INFO L85 PathProgramCache]: Analyzing trace with hash 1087612777, now seen corresponding path program 1 times [2023-08-26 12:38:34,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:34,795 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328676375] [2023-08-26 12:38:34,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:34,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:34,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:34,828 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:34,829 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:34,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328676375] [2023-08-26 12:38:34,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328676375] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:38:34,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354665081] [2023-08-26 12:38:34,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:34,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:38:34,829 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:38:34,833 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 12:38:34,835 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-08-26 12:38:34,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:34,910 INFO L262 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 12:38:34,910 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:38:34,926 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:34,926 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:38:34,952 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:34,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1354665081] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:38:34,953 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:38:34,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-08-26 12:38:34,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904447023] [2023-08-26 12:38:34,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:38:34,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-08-26 12:38:34,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:34,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-08-26 12:38:34,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2023-08-26 12:38:34,956 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 163 out of 365 [2023-08-26 12:38:34,957 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 83 places, 91 transitions, 414 flow. Second operand has 9 states, 9 states have (on average 165.33333333333334) internal successors, (1488), 9 states have internal predecessors, (1488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:34,957 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:34,958 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 163 of 365 [2023-08-26 12:38:34,958 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:35,904 INFO L124 PetriNetUnfolderBase]: 7285/11801 cut-off events. [2023-08-26 12:38:35,904 INFO L125 PetriNetUnfolderBase]: For 10200/11316 co-relation queries the response was YES. [2023-08-26 12:38:35,920 INFO L83 FinitePrefix]: Finished finitePrefix Result has 31871 conditions, 11801 events. 7285/11801 cut-off events. For 10200/11316 co-relation queries the response was YES. Maximal size of possible extension queue 395. Compared 79885 event pairs, 147 based on Foata normal form. 1079/12715 useless extension candidates. Maximal degree in co-relation 31862. Up to 7161 conditions per place. [2023-08-26 12:38:35,953 INFO L140 encePairwiseOnDemand]: 362/365 looper letters, 82 selfloop transitions, 4 changer transitions 0/96 dead transitions. [2023-08-26 12:38:35,954 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 96 transitions, 518 flow [2023-08-26 12:38:35,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 12:38:35,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 12:38:35,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1066 transitions. [2023-08-26 12:38:35,956 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4867579908675799 [2023-08-26 12:38:35,957 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1066 transitions. [2023-08-26 12:38:35,957 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1066 transitions. [2023-08-26 12:38:35,957 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:35,957 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1066 transitions. [2023-08-26 12:38:35,959 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 177.66666666666666) internal successors, (1066), 6 states have internal predecessors, (1066), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:35,962 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 365.0) internal successors, (2555), 7 states have internal predecessors, (2555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:35,963 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 365.0) internal successors, (2555), 7 states have internal predecessors, (2555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:35,963 INFO L175 Difference]: Start difference. First operand has 83 places, 91 transitions, 414 flow. Second operand 6 states and 1066 transitions. [2023-08-26 12:38:35,963 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 96 transitions, 518 flow [2023-08-26 12:38:35,967 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 60 places, 96 transitions, 452 flow, removed 32 selfloop flow, removed 3 redundant places. [2023-08-26 12:38:35,968 INFO L231 Difference]: Finished difference. Result has 60 places, 43 transitions, 142 flow [2023-08-26 12:38:35,968 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=365, PETRI_DIFFERENCE_MINUEND_FLOW=134, PETRI_DIFFERENCE_MINUEND_PLACES=55, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=43, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=142, PETRI_PLACES=60, PETRI_TRANSITIONS=43} [2023-08-26 12:38:35,968 INFO L281 CegarLoopForPetriNet]: 84 programPoint places, -24 predicate places. [2023-08-26 12:38:35,969 INFO L495 AbstractCegarLoop]: Abstraction has has 60 places, 43 transitions, 142 flow [2023-08-26 12:38:35,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 165.33333333333334) internal successors, (1488), 9 states have internal predecessors, (1488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:35,969 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:35,969 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 12:38:35,979 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-08-26 12:38:36,175 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-08-26 12:38:36,175 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-08-26 12:38:36,175 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:36,176 INFO L85 PathProgramCache]: Analyzing trace with hash -1224758904, now seen corresponding path program 1 times [2023-08-26 12:38:36,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:36,176 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796569865] [2023-08-26 12:38:36,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:36,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:36,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:38:36,188 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:38:36,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:38:36,204 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:38:36,204 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:38:36,204 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (37 of 38 remaining) [2023-08-26 12:38:36,205 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (36 of 38 remaining) [2023-08-26 12:38:36,205 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (35 of 38 remaining) [2023-08-26 12:38:36,205 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (34 of 38 remaining) [2023-08-26 12:38:36,205 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (33 of 38 remaining) [2023-08-26 12:38:36,205 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4ASSERT_VIOLATIONASSERT (32 of 38 remaining) [2023-08-26 12:38:36,205 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (31 of 38 remaining) [2023-08-26 12:38:36,205 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (30 of 38 remaining) [2023-08-26 12:38:36,206 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (29 of 38 remaining) [2023-08-26 12:38:36,206 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (28 of 38 remaining) [2023-08-26 12:38:36,206 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (27 of 38 remaining) [2023-08-26 12:38:36,206 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (26 of 38 remaining) [2023-08-26 12:38:36,206 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (25 of 38 remaining) [2023-08-26 12:38:36,206 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (24 of 38 remaining) [2023-08-26 12:38:36,206 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 38 remaining) [2023-08-26 12:38:36,206 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 38 remaining) [2023-08-26 12:38:36,206 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 38 remaining) [2023-08-26 12:38:36,207 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 38 remaining) [2023-08-26 12:38:36,207 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 38 remaining) [2023-08-26 12:38:36,207 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 38 remaining) [2023-08-26 12:38:36,207 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 38 remaining) [2023-08-26 12:38:36,207 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 38 remaining) [2023-08-26 12:38:36,207 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 38 remaining) [2023-08-26 12:38:36,207 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 38 remaining) [2023-08-26 12:38:36,207 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 38 remaining) [2023-08-26 12:38:36,208 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 38 remaining) [2023-08-26 12:38:36,208 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 38 remaining) [2023-08-26 12:38:36,208 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 38 remaining) [2023-08-26 12:38:36,208 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 38 remaining) [2023-08-26 12:38:36,208 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 38 remaining) [2023-08-26 12:38:36,208 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 38 remaining) [2023-08-26 12:38:36,208 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 38 remaining) [2023-08-26 12:38:36,208 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 38 remaining) [2023-08-26 12:38:36,208 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 38 remaining) [2023-08-26 12:38:36,209 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 38 remaining) [2023-08-26 12:38:36,209 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 38 remaining) [2023-08-26 12:38:36,209 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 38 remaining) [2023-08-26 12:38:36,209 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 38 remaining) [2023-08-26 12:38:36,209 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-08-26 12:38:36,209 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1] [2023-08-26 12:38:36,210 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:38:36,210 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 12:38:36,239 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 12:38:36,244 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 220 places, 240 transitions, 512 flow [2023-08-26 12:38:36,294 INFO L124 PetriNetUnfolderBase]: 49/415 cut-off events. [2023-08-26 12:38:36,295 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 12:38:36,299 INFO L83 FinitePrefix]: Finished finitePrefix Result has 438 conditions, 415 events. 49/415 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1573 event pairs, 0 based on Foata normal form. 0/304 useless extension candidates. Maximal degree in co-relation 337. Up to 10 conditions per place. [2023-08-26 12:38:36,299 INFO L82 GeneralOperation]: Start removeDead. Operand has 220 places, 240 transitions, 512 flow [2023-08-26 12:38:36,303 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 220 places, 240 transitions, 512 flow [2023-08-26 12:38:36,303 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:38:36,303 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 220 places, 240 transitions, 512 flow [2023-08-26 12:38:36,304 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 220 places, 240 transitions, 512 flow [2023-08-26 12:38:36,304 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 220 places, 240 transitions, 512 flow [2023-08-26 12:38:36,344 INFO L124 PetriNetUnfolderBase]: 49/415 cut-off events. [2023-08-26 12:38:36,344 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 12:38:36,348 INFO L83 FinitePrefix]: Finished finitePrefix Result has 438 conditions, 415 events. 49/415 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1573 event pairs, 0 based on Foata normal form. 0/304 useless extension candidates. Maximal degree in co-relation 337. Up to 10 conditions per place. [2023-08-26 12:38:36,362 INFO L119 LiptonReduction]: Number of co-enabled transitions 34400 [2023-08-26 12:38:39,686 INFO L134 LiptonReduction]: Checked pairs total: 98181 [2023-08-26 12:38:39,686 INFO L136 LiptonReduction]: Total number of compositions: 196 [2023-08-26 12:38:39,687 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:38:39,687 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@22f74107, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:38:39,687 INFO L358 AbstractCegarLoop]: Starting to check reachability of 46 error locations. [2023-08-26 12:38:39,688 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:38:39,688 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 12:38:39,688 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:38:39,688 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:39,688 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:39,688 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 43 more)] === [2023-08-26 12:38:39,688 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:39,688 INFO L85 PathProgramCache]: Analyzing trace with hash 53466, now seen corresponding path program 1 times [2023-08-26 12:38:39,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:39,689 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587289844] [2023-08-26 12:38:39,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:39,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:39,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:39,711 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:39,711 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:39,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587289844] [2023-08-26 12:38:39,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587289844] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:39,712 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:39,712 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:39,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117809202] [2023-08-26 12:38:39,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:39,713 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:39,713 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:39,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:39,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:39,714 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 159 out of 436 [2023-08-26 12:38:39,715 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 106 places, 124 transitions, 280 flow. Second operand has 3 states, 3 states have (on average 159.66666666666666) internal successors, (479), 3 states have internal predecessors, (479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:39,715 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:39,715 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 159 of 436 [2023-08-26 12:38:39,715 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand