/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf --traceabstraction.order.of.the.error.locations.to.be.checked PROGRAM_FIRST -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml --cacsl2boogietranslator.check.unreachability.of.reach_error.function false --cacsl2boogietranslator.pointer.base.address.is.valid.at.dereference ASSERTandASSUME --cacsl2boogietranslator.pointer.to.allocated.memory.at.dereference ASSERTandASSUME --cacsl2boogietranslator.check.array.bounds.for.arrays.that.are.off.heap ASSERTandASSUME --cacsl2boogietranslator.check.if.freed.pointer.was.valid true --cacsl2boogietranslator.adapt.memory.model.on.pointer.casts.if.necessary true -i ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_08-cond_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 18:46:09,888 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 18:46:09,978 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf [2023-08-26 18:46:09,985 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 18:46:09,985 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 18:46:10,016 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 18:46:10,017 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 18:46:10,017 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 18:46:10,018 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 18:46:10,021 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 18:46:10,021 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 18:46:10,021 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 18:46:10,022 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 18:46:10,023 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 18:46:10,023 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 18:46:10,023 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 18:46:10,023 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 18:46:10,024 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 18:46:10,024 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 18:46:10,024 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 18:46:10,024 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 18:46:10,024 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 18:46:10,025 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 18:46:10,025 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 18:46:10,025 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 18:46:10,026 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 18:46:10,026 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 18:46:10,026 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:46:10,026 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 18:46:10,027 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 18:46:10,028 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 18:46:10,028 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 18:46:10,028 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 18:46:10,028 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 18:46:10,028 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 18:46:10,029 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 18:46:10,364 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 18:46:10,388 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 18:46:10,391 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 18:46:10,392 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 18:46:10,392 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 18:46:10,393 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_08-cond_racefree.i [2023-08-26 18:46:11,642 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 18:46:11,951 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 18:46:11,951 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_08-cond_racefree.i [2023-08-26 18:46:11,971 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/256a66c22/1b66c933614a415a901f6538f2d8d333/FLAG11bad5ed6 [2023-08-26 18:46:11,981 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/256a66c22/1b66c933614a415a901f6538f2d8d333 [2023-08-26 18:46:11,984 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 18:46:11,985 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 18:46:11,986 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 18:46:11,986 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 18:46:11,988 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 18:46:11,989 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:46:11" (1/1) ... [2023-08-26 18:46:11,990 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@178c963 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:11, skipping insertion in model container [2023-08-26 18:46:11,990 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:46:11" (1/1) ... [2023-08-26 18:46:12,037 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 18:46:12,472 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:46:12,487 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 18:46:12,509 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: unsigned short [119] [2023-08-26 18:46:12,519 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [481] [2023-08-26 18:46:12,520 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [481] [2023-08-26 18:46:12,558 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:46:12,623 INFO L206 MainTranslator]: Completed translation [2023-08-26 18:46:12,623 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12 WrapperNode [2023-08-26 18:46:12,623 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 18:46:12,624 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 18:46:12,625 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 18:46:12,625 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 18:46:12,630 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12" (1/1) ... [2023-08-26 18:46:12,664 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12" (1/1) ... [2023-08-26 18:46:12,690 INFO L138 Inliner]: procedures = 270, calls = 31, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 95 [2023-08-26 18:46:12,690 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 18:46:12,691 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 18:46:12,691 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 18:46:12,691 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 18:46:12,699 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12" (1/1) ... [2023-08-26 18:46:12,699 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12" (1/1) ... [2023-08-26 18:46:12,709 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12" (1/1) ... [2023-08-26 18:46:12,709 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12" (1/1) ... [2023-08-26 18:46:12,715 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12" (1/1) ... [2023-08-26 18:46:12,718 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12" (1/1) ... [2023-08-26 18:46:12,720 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12" (1/1) ... [2023-08-26 18:46:12,728 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12" (1/1) ... [2023-08-26 18:46:12,731 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 18:46:12,732 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 18:46:12,732 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 18:46:12,732 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 18:46:12,733 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12" (1/1) ... [2023-08-26 18:46:12,738 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:46:12,749 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:46:12,761 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-26 18:46:12,778 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-26 18:46:12,797 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 18:46:12,798 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 18:46:12,798 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 18:46:12,798 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 18:46:12,798 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 18:46:12,798 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 18:46:12,798 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 18:46:12,799 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 18:46:12,799 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 18:46:12,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 18:46:12,799 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 18:46:12,800 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-26 18:46:12,934 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 18:46:12,936 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 18:46:13,144 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 18:46:13,151 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 18:46:13,151 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-08-26 18:46:13,153 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:46:13 BoogieIcfgContainer [2023-08-26 18:46:13,153 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 18:46:13,155 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 18:46:13,155 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 18:46:13,157 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 18:46:13,157 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 06:46:11" (1/3) ... [2023-08-26 18:46:13,158 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39139e00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:46:13, skipping insertion in model container [2023-08-26 18:46:13,158 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:46:12" (2/3) ... [2023-08-26 18:46:13,158 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39139e00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:46:13, skipping insertion in model container [2023-08-26 18:46:13,158 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:46:13" (3/3) ... [2023-08-26 18:46:13,161 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_08-cond_racefree.i [2023-08-26 18:46:13,182 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 18:46:13,183 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-08-26 18:46:13,183 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 18:46:13,262 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 18:46:13,291 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 118 places, 131 transitions, 270 flow [2023-08-26 18:46:13,343 INFO L124 PetriNetUnfolderBase]: 25/183 cut-off events. [2023-08-26 18:46:13,344 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:46:13,350 INFO L83 FinitePrefix]: Finished finitePrefix Result has 189 conditions, 183 events. 25/183 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 456 event pairs, 0 based on Foata normal form. 0/145 useless extension candidates. Maximal degree in co-relation 91. Up to 6 conditions per place. [2023-08-26 18:46:13,351 INFO L82 GeneralOperation]: Start removeDead. Operand has 118 places, 131 transitions, 270 flow [2023-08-26 18:46:13,355 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 118 places, 131 transitions, 270 flow [2023-08-26 18:46:13,358 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:46:13,366 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 118 places, 131 transitions, 270 flow [2023-08-26 18:46:13,368 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 118 places, 131 transitions, 270 flow [2023-08-26 18:46:13,369 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 118 places, 131 transitions, 270 flow [2023-08-26 18:46:13,429 INFO L124 PetriNetUnfolderBase]: 25/183 cut-off events. [2023-08-26 18:46:13,430 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:46:13,432 INFO L83 FinitePrefix]: Finished finitePrefix Result has 189 conditions, 183 events. 25/183 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 456 event pairs, 0 based on Foata normal form. 0/145 useless extension candidates. Maximal degree in co-relation 91. Up to 6 conditions per place. [2023-08-26 18:46:13,435 INFO L119 LiptonReduction]: Number of co-enabled transitions 3248 [2023-08-26 18:46:16,883 INFO L134 LiptonReduction]: Checked pairs total: 5599 [2023-08-26 18:46:16,883 INFO L136 LiptonReduction]: Total number of compositions: 124 [2023-08-26 18:46:16,895 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:46:16,901 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;@3c69cd49, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:46:16,901 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:46:16,903 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:46:16,903 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:46:16,903 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:46:16,903 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:16,904 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:46:16,904 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:16,908 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:16,908 INFO L85 PathProgramCache]: Analyzing trace with hash 16412, now seen corresponding path program 1 times [2023-08-26 18:46:16,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:16,923 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030345856] [2023-08-26 18:46:16,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:16,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:17,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:17,149 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:17,150 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:17,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030345856] [2023-08-26 18:46:17,151 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030345856] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:46:17,151 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:46:17,151 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:46:17,152 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835028101] [2023-08-26 18:46:17,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:46:17,160 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:46:17,164 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:17,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:46:17,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:46:17,184 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 101 out of 255 [2023-08-26 18:46:17,186 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 33 places, 42 transitions, 92 flow. Second operand has 3 states, 3 states have (on average 101.66666666666667) internal successors, (305), 3 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:17,186 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:17,186 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 101 of 255 [2023-08-26 18:46:17,187 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:17,302 INFO L124 PetriNetUnfolderBase]: 115/259 cut-off events. [2023-08-26 18:46:17,302 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:46:17,303 INFO L83 FinitePrefix]: Finished finitePrefix Result has 523 conditions, 259 events. 115/259 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 1033 event pairs, 96 based on Foata normal form. 14/212 useless extension candidates. Maximal degree in co-relation 477. Up to 237 conditions per place. [2023-08-26 18:46:17,305 INFO L140 encePairwiseOnDemand]: 241/255 looper letters, 24 selfloop transitions, 1 changer transitions 10/36 dead transitions. [2023-08-26 18:46:17,305 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 36 transitions, 148 flow [2023-08-26 18:46:17,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:46:17,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:46:17,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 355 transitions. [2023-08-26 18:46:17,319 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46405228758169936 [2023-08-26 18:46:17,319 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 355 transitions. [2023-08-26 18:46:17,320 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 355 transitions. [2023-08-26 18:46:17,321 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:17,324 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 355 transitions. [2023-08-26 18:46:17,327 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 118.33333333333333) internal successors, (355), 3 states have internal predecessors, (355), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:17,331 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 255.0) internal successors, (1020), 4 states have internal predecessors, (1020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:17,331 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 255.0) internal successors, (1020), 4 states have internal predecessors, (1020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:17,333 INFO L175 Difference]: Start difference. First operand has 33 places, 42 transitions, 92 flow. Second operand 3 states and 355 transitions. [2023-08-26 18:46:17,334 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 36 transitions, 148 flow [2023-08-26 18:46:17,336 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 31 places, 36 transitions, 148 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:46:17,338 INFO L231 Difference]: Finished difference. Result has 31 places, 26 transitions, 60 flow [2023-08-26 18:46:17,340 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=255, PETRI_DIFFERENCE_MINUEND_FLOW=64, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=60, PETRI_PLACES=31, PETRI_TRANSITIONS=26} [2023-08-26 18:46:17,343 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, -2 predicate places. [2023-08-26 18:46:17,343 INFO L495 AbstractCegarLoop]: Abstraction has has 31 places, 26 transitions, 60 flow [2023-08-26 18:46:17,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 101.66666666666667) internal successors, (305), 3 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:17,344 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:17,344 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:46:17,344 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 18:46:17,344 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:17,345 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:17,345 INFO L85 PathProgramCache]: Analyzing trace with hash 16413, now seen corresponding path program 1 times [2023-08-26 18:46:17,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:17,346 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139263046] [2023-08-26 18:46:17,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:17,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:17,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:17,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:17,442 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:17,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139263046] [2023-08-26 18:46:17,442 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2139263046] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:46:17,443 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:46:17,443 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:46:17,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655406942] [2023-08-26 18:46:17,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:46:17,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:46:17,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:17,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:46:17,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:46:17,446 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 96 out of 255 [2023-08-26 18:46:17,446 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 31 places, 26 transitions, 60 flow. Second operand has 3 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 18:46:17,446 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:17,446 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 96 of 255 [2023-08-26 18:46:17,447 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:17,508 INFO L124 PetriNetUnfolderBase]: 105/229 cut-off events. [2023-08-26 18:46:17,509 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:46:17,509 INFO L83 FinitePrefix]: Finished finitePrefix Result has 465 conditions, 229 events. 105/229 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 978 event pairs, 0 based on Foata normal form. 0/183 useless extension candidates. Maximal degree in co-relation 458. Up to 218 conditions per place. [2023-08-26 18:46:17,510 INFO L140 encePairwiseOnDemand]: 250/255 looper letters, 31 selfloop transitions, 2 changer transitions 1/35 dead transitions. [2023-08-26 18:46:17,511 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 35 transitions, 146 flow [2023-08-26 18:46:17,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:46:17,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:46:17,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 325 transitions. [2023-08-26 18:46:17,513 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42483660130718953 [2023-08-26 18:46:17,513 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 325 transitions. [2023-08-26 18:46:17,513 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 325 transitions. [2023-08-26 18:46:17,514 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:17,514 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 325 transitions. [2023-08-26 18:46:17,515 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 108.33333333333333) internal successors, (325), 3 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:17,517 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 255.0) internal successors, (1020), 4 states have internal predecessors, (1020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:17,517 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 255.0) internal successors, (1020), 4 states have internal predecessors, (1020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:17,518 INFO L175 Difference]: Start difference. First operand has 31 places, 26 transitions, 60 flow. Second operand 3 states and 325 transitions. [2023-08-26 18:46:17,518 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 35 transitions, 146 flow [2023-08-26 18:46:17,518 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 35 transitions, 143 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:46:17,519 INFO L231 Difference]: Finished difference. Result has 30 places, 26 transitions, 69 flow [2023-08-26 18:46:17,519 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=255, PETRI_DIFFERENCE_MINUEND_FLOW=57, PETRI_DIFFERENCE_MINUEND_PLACES=27, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=69, PETRI_PLACES=30, PETRI_TRANSITIONS=26} [2023-08-26 18:46:17,520 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, -3 predicate places. [2023-08-26 18:46:17,520 INFO L495 AbstractCegarLoop]: Abstraction has has 30 places, 26 transitions, 69 flow [2023-08-26 18:46:17,520 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 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 18:46:17,521 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:17,521 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 18:46:17,521 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 18:46:17,521 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:17,522 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:17,522 INFO L85 PathProgramCache]: Analyzing trace with hash 489259901, now seen corresponding path program 1 times [2023-08-26 18:46:17,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:17,522 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312026386] [2023-08-26 18:46:17,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:17,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:17,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:17,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:17,675 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:17,675 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312026386] [2023-08-26 18:46:17,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1312026386] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:46:17,677 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735252623] [2023-08-26 18:46:17,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:17,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:46:17,678 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:46:17,689 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:46:17,726 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-26 18:46:17,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:17,805 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:46:17,816 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:46:17,873 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:46:17,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:17,925 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:46:17,982 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:17,982 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1735252623] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:46:17,982 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:46:17,982 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:46:17,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747684138] [2023-08-26 18:46:17,983 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:46:17,983 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:46:17,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:17,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:46:17,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:46:17,986 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 96 out of 255 [2023-08-26 18:46:17,988 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 26 transitions, 69 flow. Second operand has 8 states, 8 states have (on average 97.875) internal successors, (783), 8 states have internal predecessors, (783), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:17,988 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:17,988 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 96 of 255 [2023-08-26 18:46:17,988 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:18,072 INFO L124 PetriNetUnfolderBase]: 16/46 cut-off events. [2023-08-26 18:46:18,073 INFO L125 PetriNetUnfolderBase]: For 8/8 co-relation queries the response was YES. [2023-08-26 18:46:18,075 INFO L83 FinitePrefix]: Finished finitePrefix Result has 117 conditions, 46 events. 16/46 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 84 event pairs, 0 based on Foata normal form. 9/55 useless extension candidates. Maximal degree in co-relation 108. Up to 34 conditions per place. [2023-08-26 18:46:18,075 INFO L140 encePairwiseOnDemand]: 250/255 looper letters, 0 selfloop transitions, 0 changer transitions 22/22 dead transitions. [2023-08-26 18:46:18,075 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 22 transitions, 95 flow [2023-08-26 18:46:18,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:46:18,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:46:18,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 408 transitions. [2023-08-26 18:46:18,078 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4 [2023-08-26 18:46:18,078 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 408 transitions. [2023-08-26 18:46:18,078 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 408 transitions. [2023-08-26 18:46:18,079 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:18,079 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 408 transitions. [2023-08-26 18:46:18,080 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 102.0) internal successors, (408), 4 states have internal predecessors, (408), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:18,084 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 255.0) internal successors, (1275), 5 states have internal predecessors, (1275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:18,084 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 255.0) internal successors, (1275), 5 states have internal predecessors, (1275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:18,085 INFO L175 Difference]: Start difference. First operand has 30 places, 26 transitions, 69 flow. Second operand 4 states and 408 transitions. [2023-08-26 18:46:18,085 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 22 transitions, 95 flow [2023-08-26 18:46:18,085 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 19 places, 22 transitions, 89 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-26 18:46:18,086 INFO L231 Difference]: Finished difference. Result has 19 places, 0 transitions, 0 flow [2023-08-26 18:46:18,086 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=255, PETRI_DIFFERENCE_MINUEND_FLOW=29, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=13, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=19, PETRI_TRANSITIONS=0} [2023-08-26 18:46:18,087 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, -14 predicate places. [2023-08-26 18:46:18,088 INFO L495 AbstractCegarLoop]: Abstraction has has 19 places, 0 transitions, 0 flow [2023-08-26 18:46:18,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 97.875) internal successors, (783), 8 states have internal predecessors, (783), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:18,092 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:46:18,092 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:46:18,092 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:46:18,092 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:46:18,093 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:46:18,100 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-08-26 18:46:18,299 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:46:18,299 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-26 18:46:18,302 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:46:18,305 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 118 places, 131 transitions, 270 flow [2023-08-26 18:46:18,323 INFO L124 PetriNetUnfolderBase]: 25/183 cut-off events. [2023-08-26 18:46:18,323 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:46:18,324 INFO L83 FinitePrefix]: Finished finitePrefix Result has 189 conditions, 183 events. 25/183 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 456 event pairs, 0 based on Foata normal form. 0/145 useless extension candidates. Maximal degree in co-relation 91. Up to 6 conditions per place. [2023-08-26 18:46:18,324 INFO L82 GeneralOperation]: Start removeDead. Operand has 118 places, 131 transitions, 270 flow [2023-08-26 18:46:18,325 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 114 places, 126 transitions, 257 flow [2023-08-26 18:46:18,325 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:46:18,326 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 114 places, 126 transitions, 257 flow [2023-08-26 18:46:18,326 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 114 places, 126 transitions, 257 flow [2023-08-26 18:46:18,326 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 114 places, 126 transitions, 257 flow [2023-08-26 18:46:18,342 INFO L124 PetriNetUnfolderBase]: 24/178 cut-off events. [2023-08-26 18:46:18,342 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:46:18,343 INFO L83 FinitePrefix]: Finished finitePrefix Result has 183 conditions, 178 events. 24/178 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 438 event pairs, 0 based on Foata normal form. 0/140 useless extension candidates. Maximal degree in co-relation 91. Up to 6 conditions per place. [2023-08-26 18:46:18,345 INFO L119 LiptonReduction]: Number of co-enabled transitions 3248 [2023-08-26 18:46:21,504 INFO L134 LiptonReduction]: Checked pairs total: 5933 [2023-08-26 18:46:21,505 INFO L136 LiptonReduction]: Total number of compositions: 121 [2023-08-26 18:46:21,508 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:46:21,509 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;@3c69cd49, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:46:21,509 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:46:21,512 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:46:21,513 INFO L124 PetriNetUnfolderBase]: 6/35 cut-off events. [2023-08-26 18:46:21,513 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:46:21,513 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:21,513 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 18:46:21,513 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:46:21,514 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:21,514 INFO L85 PathProgramCache]: Analyzing trace with hash 1565955887, now seen corresponding path program 1 times [2023-08-26 18:46:21,514 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:21,514 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143734676] [2023-08-26 18:46:21,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:21,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:21,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:46:21,530 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:46:21,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:46:21,555 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:46:21,555 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:46:21,555 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:46:21,555 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 18:46:21,556 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:46:21,556 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:46:21,557 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:46:21,557 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 18:46:21,571 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 18:46:21,574 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 143 places, 161 transitions, 340 flow [2023-08-26 18:46:21,596 INFO L124 PetriNetUnfolderBase]: 43/292 cut-off events. [2023-08-26 18:46:21,596 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:46:21,598 INFO L83 FinitePrefix]: Finished finitePrefix Result has 306 conditions, 292 events. 43/292 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 900 event pairs, 0 based on Foata normal form. 0/228 useless extension candidates. Maximal degree in co-relation 185. Up to 9 conditions per place. [2023-08-26 18:46:21,598 INFO L82 GeneralOperation]: Start removeDead. Operand has 143 places, 161 transitions, 340 flow [2023-08-26 18:46:21,600 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 143 places, 161 transitions, 340 flow [2023-08-26 18:46:21,600 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:46:21,601 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 143 places, 161 transitions, 340 flow [2023-08-26 18:46:21,601 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 143 places, 161 transitions, 340 flow [2023-08-26 18:46:21,601 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 143 places, 161 transitions, 340 flow [2023-08-26 18:46:21,638 INFO L124 PetriNetUnfolderBase]: 43/292 cut-off events. [2023-08-26 18:46:21,638 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:46:21,640 INFO L83 FinitePrefix]: Finished finitePrefix Result has 306 conditions, 292 events. 43/292 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 900 event pairs, 0 based on Foata normal form. 0/228 useless extension candidates. Maximal degree in co-relation 185. Up to 9 conditions per place. [2023-08-26 18:46:21,645 INFO L119 LiptonReduction]: Number of co-enabled transitions 8680 [2023-08-26 18:46:24,582 INFO L134 LiptonReduction]: Checked pairs total: 19904 [2023-08-26 18:46:24,583 INFO L136 LiptonReduction]: Total number of compositions: 132 [2023-08-26 18:46:24,585 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:46:24,586 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;@3c69cd49, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:46:24,586 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:46:24,588 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:46:24,588 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:46:24,588 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:46:24,588 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:24,588 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:46:24,588 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:24,589 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:24,589 INFO L85 PathProgramCache]: Analyzing trace with hash 30625, now seen corresponding path program 1 times [2023-08-26 18:46:24,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:24,589 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [606078404] [2023-08-26 18:46:24,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:24,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:24,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:24,639 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:24,640 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:24,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [606078404] [2023-08-26 18:46:24,640 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [606078404] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:46:24,640 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:46:24,640 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:46:24,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233504663] [2023-08-26 18:46:24,640 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:46:24,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:46:24,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:24,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:46:24,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:46:24,643 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 123 out of 293 [2023-08-26 18:46:24,644 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 50 places, 63 transitions, 144 flow. Second operand has 3 states, 3 states have (on average 123.66666666666667) internal successors, (371), 3 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:24,644 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:24,644 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 123 of 293 [2023-08-26 18:46:24,644 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:24,968 INFO L124 PetriNetUnfolderBase]: 1804/3279 cut-off events. [2023-08-26 18:46:24,969 INFO L125 PetriNetUnfolderBase]: For 45/45 co-relation queries the response was YES. [2023-08-26 18:46:24,973 INFO L83 FinitePrefix]: Finished finitePrefix Result has 6253 conditions, 3279 events. 1804/3279 cut-off events. For 45/45 co-relation queries the response was YES. Maximal size of possible extension queue 142. Compared 20698 event pairs, 1600 based on Foata normal form. 442/3148 useless extension candidates. Maximal degree in co-relation 3193. Up to 2717 conditions per place. [2023-08-26 18:46:24,987 INFO L140 encePairwiseOnDemand]: 274/293 looper letters, 32 selfloop transitions, 1 changer transitions 17/60 dead transitions. [2023-08-26 18:46:24,988 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 50 places, 60 transitions, 236 flow [2023-08-26 18:46:24,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:46:24,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:46:24,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 447 transitions. [2023-08-26 18:46:24,989 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5085324232081911 [2023-08-26 18:46:24,990 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 447 transitions. [2023-08-26 18:46:24,990 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 447 transitions. [2023-08-26 18:46:24,990 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:24,990 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 447 transitions. [2023-08-26 18:46:24,991 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 149.0) internal successors, (447), 3 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:24,993 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 293.0) internal successors, (1172), 4 states have internal predecessors, (1172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:24,993 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 293.0) internal successors, (1172), 4 states have internal predecessors, (1172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:24,994 INFO L175 Difference]: Start difference. First operand has 50 places, 63 transitions, 144 flow. Second operand 3 states and 447 transitions. [2023-08-26 18:46:24,994 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 50 places, 60 transitions, 236 flow [2023-08-26 18:46:24,996 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 50 places, 60 transitions, 236 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:46:24,997 INFO L231 Difference]: Finished difference. Result has 50 places, 43 transitions, 102 flow [2023-08-26 18:46:24,998 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=293, PETRI_DIFFERENCE_MINUEND_FLOW=110, PETRI_DIFFERENCE_MINUEND_PLACES=48, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=46, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=45, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=102, PETRI_PLACES=50, PETRI_TRANSITIONS=43} [2023-08-26 18:46:25,000 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, 0 predicate places. [2023-08-26 18:46:25,001 INFO L495 AbstractCegarLoop]: Abstraction has has 50 places, 43 transitions, 102 flow [2023-08-26 18:46:25,002 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 123.66666666666667) internal successors, (371), 3 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:25,002 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:25,002 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:46:25,002 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 18:46:25,002 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:25,003 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:25,003 INFO L85 PathProgramCache]: Analyzing trace with hash 30624, now seen corresponding path program 1 times [2023-08-26 18:46:25,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:25,003 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789477115] [2023-08-26 18:46:25,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:25,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:25,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:25,080 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:25,080 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:25,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789477115] [2023-08-26 18:46:25,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789477115] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:46:25,081 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:46:25,081 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:46:25,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776397156] [2023-08-26 18:46:25,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:46:25,081 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:46:25,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:25,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:46:25,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:46:25,082 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 118 out of 293 [2023-08-26 18:46:25,083 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 50 places, 43 transitions, 102 flow. Second operand has 3 states, 3 states have (on average 118.66666666666667) internal successors, (356), 3 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:25,083 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:25,083 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 118 of 293 [2023-08-26 18:46:25,083 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:25,329 INFO L124 PetriNetUnfolderBase]: 1562/2754 cut-off events. [2023-08-26 18:46:25,330 INFO L125 PetriNetUnfolderBase]: For 37/37 co-relation queries the response was YES. [2023-08-26 18:46:25,333 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5322 conditions, 2754 events. 1562/2754 cut-off events. For 37/37 co-relation queries the response was YES. Maximal size of possible extension queue 125. Compared 16739 event pairs, 704 based on Foata normal form. 0/2357 useless extension candidates. Maximal degree in co-relation 5314. Up to 2513 conditions per place. [2023-08-26 18:46:25,346 INFO L140 encePairwiseOnDemand]: 288/293 looper letters, 39 selfloop transitions, 2 changer transitions 0/51 dead transitions. [2023-08-26 18:46:25,346 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 51 transitions, 200 flow [2023-08-26 18:46:25,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:46:25,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:46:25,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 398 transitions. [2023-08-26 18:46:25,348 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4527872582480091 [2023-08-26 18:46:25,348 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 398 transitions. [2023-08-26 18:46:25,348 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 398 transitions. [2023-08-26 18:46:25,348 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:25,348 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 398 transitions. [2023-08-26 18:46:25,349 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 132.66666666666666) internal successors, (398), 3 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:25,351 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 293.0) internal successors, (1172), 4 states have internal predecessors, (1172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:25,351 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 293.0) internal successors, (1172), 4 states have internal predecessors, (1172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:25,352 INFO L175 Difference]: Start difference. First operand has 50 places, 43 transitions, 102 flow. Second operand 3 states and 398 transitions. [2023-08-26 18:46:25,352 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 51 transitions, 200 flow [2023-08-26 18:46:25,355 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 47 places, 51 transitions, 197 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:46:25,356 INFO L231 Difference]: Finished difference. Result has 48 places, 44 transitions, 115 flow [2023-08-26 18:46:25,357 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=293, PETRI_DIFFERENCE_MINUEND_FLOW=99, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=43, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=41, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=115, PETRI_PLACES=48, PETRI_TRANSITIONS=44} [2023-08-26 18:46:25,359 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, -2 predicate places. [2023-08-26 18:46:25,359 INFO L495 AbstractCegarLoop]: Abstraction has has 48 places, 44 transitions, 115 flow [2023-08-26 18:46:25,359 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 118.66666666666667) internal successors, (356), 3 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:25,359 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:25,359 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:46:25,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 18:46:25,360 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:25,360 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:25,360 INFO L85 PathProgramCache]: Analyzing trace with hash -1756715782, now seen corresponding path program 1 times [2023-08-26 18:46:25,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:25,365 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153049864] [2023-08-26 18:46:25,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:25,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:25,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:25,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:25,483 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:25,486 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153049864] [2023-08-26 18:46:25,486 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1153049864] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:46:25,486 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975267348] [2023-08-26 18:46:25,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:25,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:46:25,487 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:46:25,489 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:46:25,498 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-26 18:46:25,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:25,562 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:46:25,564 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:46:25,575 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:46:25,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:25,614 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:46:25,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:25,649 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975267348] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:46:25,649 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:46:25,649 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:46:25,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923792021] [2023-08-26 18:46:25,650 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:46:25,650 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:46:25,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:25,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:46:25,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:46:25,652 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 118 out of 293 [2023-08-26 18:46:25,656 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 44 transitions, 115 flow. Second operand has 8 states, 8 states have (on average 119.875) internal successors, (959), 8 states have internal predecessors, (959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:25,656 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:25,656 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 118 of 293 [2023-08-26 18:46:25,656 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:25,806 INFO L124 PetriNetUnfolderBase]: 286/532 cut-off events. [2023-08-26 18:46:25,806 INFO L125 PetriNetUnfolderBase]: For 87/87 co-relation queries the response was YES. [2023-08-26 18:46:25,807 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1131 conditions, 532 events. 286/532 cut-off events. For 87/87 co-relation queries the response was YES. Maximal size of possible extension queue 31. Compared 2479 event pairs, 40 based on Foata normal form. 70/599 useless extension candidates. Maximal degree in co-relation 1121. Up to 346 conditions per place. [2023-08-26 18:46:25,808 INFO L140 encePairwiseOnDemand]: 288/293 looper letters, 0 selfloop transitions, 0 changer transitions 51/51 dead transitions. [2023-08-26 18:46:25,808 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 51 transitions, 202 flow [2023-08-26 18:46:25,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 18:46:25,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 18:46:25,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 638 transitions. [2023-08-26 18:46:25,810 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4354948805460751 [2023-08-26 18:46:25,810 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 638 transitions. [2023-08-26 18:46:25,810 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 638 transitions. [2023-08-26 18:46:25,811 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:25,811 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 638 transitions. [2023-08-26 18:46:25,812 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 127.6) internal successors, (638), 5 states have internal predecessors, (638), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:25,814 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 293.0) internal successors, (1758), 6 states have internal predecessors, (1758), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:25,814 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 293.0) internal successors, (1758), 6 states have internal predecessors, (1758), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:25,815 INFO L175 Difference]: Start difference. First operand has 48 places, 44 transitions, 115 flow. Second operand 5 states and 638 transitions. [2023-08-26 18:46:25,815 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 51 transitions, 202 flow [2023-08-26 18:46:25,815 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 51 transitions, 200 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:46:25,816 INFO L231 Difference]: Finished difference. Result has 39 places, 0 transitions, 0 flow [2023-08-26 18:46:25,816 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=293, PETRI_DIFFERENCE_MINUEND_FLOW=72, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=39, PETRI_TRANSITIONS=0} [2023-08-26 18:46:25,816 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, -11 predicate places. [2023-08-26 18:46:25,817 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 0 transitions, 0 flow [2023-08-26 18:46:25,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 119.875) internal successors, (959), 8 states have internal predecessors, (959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:25,817 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:46:25,817 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:46:25,817 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:46:25,818 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:46:25,818 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:46:25,825 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-26 18:46:26,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-08-26 18:46:26,024 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-26 18:46:26,024 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:46:26,026 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 143 places, 161 transitions, 340 flow [2023-08-26 18:46:26,048 INFO L124 PetriNetUnfolderBase]: 43/292 cut-off events. [2023-08-26 18:46:26,048 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:46:26,049 INFO L83 FinitePrefix]: Finished finitePrefix Result has 306 conditions, 292 events. 43/292 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 900 event pairs, 0 based on Foata normal form. 0/228 useless extension candidates. Maximal degree in co-relation 185. Up to 9 conditions per place. [2023-08-26 18:46:26,050 INFO L82 GeneralOperation]: Start removeDead. Operand has 143 places, 161 transitions, 340 flow [2023-08-26 18:46:26,051 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 143 places, 161 transitions, 340 flow [2023-08-26 18:46:26,051 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:46:26,052 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 143 places, 161 transitions, 340 flow [2023-08-26 18:46:26,052 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 143 places, 161 transitions, 340 flow [2023-08-26 18:46:26,052 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 143 places, 161 transitions, 340 flow [2023-08-26 18:46:26,072 INFO L124 PetriNetUnfolderBase]: 43/292 cut-off events. [2023-08-26 18:46:26,072 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:46:26,074 INFO L83 FinitePrefix]: Finished finitePrefix Result has 306 conditions, 292 events. 43/292 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 900 event pairs, 0 based on Foata normal form. 0/228 useless extension candidates. Maximal degree in co-relation 185. Up to 9 conditions per place. [2023-08-26 18:46:26,079 INFO L119 LiptonReduction]: Number of co-enabled transitions 8680 [2023-08-26 18:46:29,005 INFO L134 LiptonReduction]: Checked pairs total: 19876 [2023-08-26 18:46:29,005 INFO L136 LiptonReduction]: Total number of compositions: 135 [2023-08-26 18:46:29,006 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:46:29,007 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;@3c69cd49, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:46:29,007 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:46:29,012 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:46:29,012 INFO L124 PetriNetUnfolderBase]: 19/80 cut-off events. [2023-08-26 18:46:29,012 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 18:46:29,012 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:29,012 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 18:46:29,013 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:46:29,013 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:29,013 INFO L85 PathProgramCache]: Analyzing trace with hash 2030122466, now seen corresponding path program 1 times [2023-08-26 18:46:29,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:29,013 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420983844] [2023-08-26 18:46:29,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:29,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:29,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:46:29,032 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:46:29,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:46:29,052 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:46:29,053 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:46:29,053 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:46:29,053 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 18:46:29,053 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:46:29,055 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:46:29,055 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:46:29,056 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 18:46:29,077 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 18:46:29,080 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:29,116 INFO L124 PetriNetUnfolderBase]: 66/438 cut-off events. [2023-08-26 18:46:29,116 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:46:29,119 INFO L83 FinitePrefix]: Finished finitePrefix Result has 466 conditions, 438 events. 66/438 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1528 event pairs, 1 based on Foata normal form. 0/340 useless extension candidates. Maximal degree in co-relation 300. Up to 16 conditions per place. [2023-08-26 18:46:29,119 INFO L82 GeneralOperation]: Start removeDead. Operand has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:29,122 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:29,122 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:46:29,122 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:29,123 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:29,123 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:29,157 INFO L124 PetriNetUnfolderBase]: 66/438 cut-off events. [2023-08-26 18:46:29,158 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:46:29,160 INFO L83 FinitePrefix]: Finished finitePrefix Result has 466 conditions, 438 events. 66/438 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1528 event pairs, 1 based on Foata normal form. 0/340 useless extension candidates. Maximal degree in co-relation 300. Up to 16 conditions per place. [2023-08-26 18:46:29,174 INFO L119 LiptonReduction]: Number of co-enabled transitions 15624 [2023-08-26 18:46:32,131 INFO L134 LiptonReduction]: Checked pairs total: 38251 [2023-08-26 18:46:32,131 INFO L136 LiptonReduction]: Total number of compositions: 150 [2023-08-26 18:46:32,132 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:46:32,132 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;@3c69cd49, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:46:32,132 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:46:32,133 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:46:32,133 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:46:32,133 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:46:32,133 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:32,133 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:46:32,133 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:32,134 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:32,134 INFO L85 PathProgramCache]: Analyzing trace with hash 46805, now seen corresponding path program 1 times [2023-08-26 18:46:32,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:32,134 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574215356] [2023-08-26 18:46:32,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:32,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:32,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:32,167 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:32,167 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:32,167 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574215356] [2023-08-26 18:46:32,167 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574215356] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:46:32,167 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:46:32,168 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:46:32,168 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474542928] [2023-08-26 18:46:32,168 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:46:32,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:46:32,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:32,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:46:32,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:46:32,169 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 145 out of 341 [2023-08-26 18:46:32,170 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 65 places, 84 transitions, 198 flow. Second operand has 3 states, 3 states have (on average 145.66666666666666) internal successors, (437), 3 states have internal predecessors, (437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:32,170 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:32,170 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 145 of 341 [2023-08-26 18:46:32,170 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:34,539 INFO L124 PetriNetUnfolderBase]: 19020/29063 cut-off events. [2023-08-26 18:46:34,539 INFO L125 PetriNetUnfolderBase]: For 719/719 co-relation queries the response was YES. [2023-08-26 18:46:34,590 INFO L83 FinitePrefix]: Finished finitePrefix Result has 56519 conditions, 29063 events. 19020/29063 cut-off events. For 719/719 co-relation queries the response was YES. Maximal size of possible extension queue 943. Compared 212911 event pairs, 16947 based on Foata normal form. 6619/31666 useless extension candidates. Maximal degree in co-relation 10908. Up to 24786 conditions per place. [2023-08-26 18:46:34,714 INFO L140 encePairwiseOnDemand]: 315/341 looper letters, 40 selfloop transitions, 1 changer transitions 22/78 dead transitions. [2023-08-26 18:46:34,714 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 78 transitions, 310 flow [2023-08-26 18:46:34,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:46:34,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:46:34,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 539 transitions. [2023-08-26 18:46:34,716 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5268817204301075 [2023-08-26 18:46:34,716 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 539 transitions. [2023-08-26 18:46:34,716 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 539 transitions. [2023-08-26 18:46:34,716 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:34,717 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 539 transitions. [2023-08-26 18:46:34,718 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 179.66666666666666) internal successors, (539), 3 states have internal predecessors, (539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:34,719 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 341.0) internal successors, (1364), 4 states have internal predecessors, (1364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:34,720 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 341.0) internal successors, (1364), 4 states have internal predecessors, (1364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:34,720 INFO L175 Difference]: Start difference. First operand has 65 places, 84 transitions, 198 flow. Second operand 3 states and 539 transitions. [2023-08-26 18:46:34,720 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 78 transitions, 310 flow [2023-08-26 18:46:34,723 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 63 places, 78 transitions, 310 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:46:34,724 INFO L231 Difference]: Finished difference. Result has 63 places, 56 transitions, 138 flow [2023-08-26 18:46:34,724 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=341, PETRI_DIFFERENCE_MINUEND_FLOW=146, PETRI_DIFFERENCE_MINUEND_PLACES=61, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=138, PETRI_PLACES=63, PETRI_TRANSITIONS=56} [2023-08-26 18:46:34,725 INFO L281 CegarLoopForPetriNet]: 65 programPoint places, -2 predicate places. [2023-08-26 18:46:34,725 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 56 transitions, 138 flow [2023-08-26 18:46:34,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 145.66666666666666) internal successors, (437), 3 states have internal predecessors, (437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:34,725 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:34,725 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:46:34,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 18:46:34,726 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:34,726 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:34,726 INFO L85 PathProgramCache]: Analyzing trace with hash 46804, now seen corresponding path program 1 times [2023-08-26 18:46:34,726 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:34,726 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243379179] [2023-08-26 18:46:34,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:34,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:34,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:34,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:34,766 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:34,766 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243379179] [2023-08-26 18:46:34,766 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [243379179] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:46:34,766 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:46:34,766 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:46:34,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614277317] [2023-08-26 18:46:34,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:46:34,767 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:46:34,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:34,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:46:34,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:46:34,768 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 140 out of 341 [2023-08-26 18:46:34,768 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 56 transitions, 138 flow. Second operand has 3 states, 3 states have (on average 140.66666666666666) internal successors, (422), 3 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:34,769 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:34,769 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 140 of 341 [2023-08-26 18:46:34,769 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:36,492 INFO L124 PetriNetUnfolderBase]: 17546/27171 cut-off events. [2023-08-26 18:46:36,492 INFO L125 PetriNetUnfolderBase]: For 740/740 co-relation queries the response was YES. [2023-08-26 18:46:36,539 INFO L83 FinitePrefix]: Finished finitePrefix Result has 52454 conditions, 27171 events. 17546/27171 cut-off events. For 740/740 co-relation queries the response was YES. Maximal size of possible extension queue 897. Compared 199929 event pairs, 11031 based on Foata normal form. 0/24009 useless extension candidates. Maximal degree in co-relation 52445. Up to 24769 conditions per place. [2023-08-26 18:46:36,667 INFO L140 encePairwiseOnDemand]: 336/341 looper letters, 47 selfloop transitions, 2 changer transitions 0/64 dead transitions. [2023-08-26 18:46:36,667 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 64 transitions, 252 flow [2023-08-26 18:46:36,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:46:36,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:46:36,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 472 transitions. [2023-08-26 18:46:36,669 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4613880742913001 [2023-08-26 18:46:36,669 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 472 transitions. [2023-08-26 18:46:36,669 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 472 transitions. [2023-08-26 18:46:36,670 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:36,670 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 472 transitions. [2023-08-26 18:46:36,671 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 157.33333333333334) internal successors, (472), 3 states have internal predecessors, (472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:36,672 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 341.0) internal successors, (1364), 4 states have internal predecessors, (1364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:36,673 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 341.0) internal successors, (1364), 4 states have internal predecessors, (1364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:36,673 INFO L175 Difference]: Start difference. First operand has 63 places, 56 transitions, 138 flow. Second operand 3 states and 472 transitions. [2023-08-26 18:46:36,673 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 64 transitions, 252 flow [2023-08-26 18:46:36,679 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 64 transitions, 249 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:46:36,680 INFO L231 Difference]: Finished difference. Result has 62 places, 57 transitions, 151 flow [2023-08-26 18:46:36,681 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=341, PETRI_DIFFERENCE_MINUEND_FLOW=135, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=54, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=151, PETRI_PLACES=62, PETRI_TRANSITIONS=57} [2023-08-26 18:46:36,682 INFO L281 CegarLoopForPetriNet]: 65 programPoint places, -3 predicate places. [2023-08-26 18:46:36,682 INFO L495 AbstractCegarLoop]: Abstraction has has 62 places, 57 transitions, 151 flow [2023-08-26 18:46:36,682 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 140.66666666666666) internal successors, (422), 3 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:36,682 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:36,683 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:46:36,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 18:46:36,683 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:36,683 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:36,683 INFO L85 PathProgramCache]: Analyzing trace with hash 315886792, now seen corresponding path program 1 times [2023-08-26 18:46:36,683 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:36,683 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397095097] [2023-08-26 18:46:36,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:36,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:36,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:36,776 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:36,776 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:36,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397095097] [2023-08-26 18:46:36,777 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397095097] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:46:36,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968977015] [2023-08-26 18:46:36,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:36,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:46:36,777 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:46:36,778 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:46:36,781 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-08-26 18:46:36,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:36,857 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:46:36,858 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:46:36,871 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:46:36,912 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:36,913 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:46:36,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:36,954 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1968977015] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:46:36,954 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:46:36,954 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:46:36,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394843992] [2023-08-26 18:46:36,955 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:46:36,955 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:46:36,955 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:36,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:46:36,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:46:36,957 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 140 out of 341 [2023-08-26 18:46:36,959 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 62 places, 57 transitions, 151 flow. Second operand has 8 states, 8 states have (on average 141.875) internal successors, (1135), 8 states have internal predecessors, (1135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:36,959 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:36,959 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 140 of 341 [2023-08-26 18:46:36,959 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:38,436 INFO L124 PetriNetUnfolderBase]: 16232/23325 cut-off events. [2023-08-26 18:46:38,436 INFO L125 PetriNetUnfolderBase]: For 1026/1026 co-relation queries the response was YES. [2023-08-26 18:46:38,470 INFO L83 FinitePrefix]: Finished finitePrefix Result has 48206 conditions, 23325 events. 16232/23325 cut-off events. For 1026/1026 co-relation queries the response was YES. Maximal size of possible extension queue 745. Compared 159069 event pairs, 400 based on Foata normal form. 7/21648 useless extension candidates. Maximal degree in co-relation 48195. Up to 18024 conditions per place. [2023-08-26 18:46:38,553 INFO L140 encePairwiseOnDemand]: 336/341 looper letters, 98 selfloop transitions, 8 changer transitions 1/122 dead transitions. [2023-08-26 18:46:38,553 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 66 places, 122 transitions, 499 flow [2023-08-26 18:46:38,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:46:38,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:46:38,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 952 transitions. [2023-08-26 18:46:38,556 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46529814271749753 [2023-08-26 18:46:38,556 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 952 transitions. [2023-08-26 18:46:38,556 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 952 transitions. [2023-08-26 18:46:38,557 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:38,557 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 952 transitions. [2023-08-26 18:46:38,558 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 158.66666666666666) internal successors, (952), 6 states have internal predecessors, (952), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:38,561 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 341.0) internal successors, (2387), 7 states have internal predecessors, (2387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:38,561 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 341.0) internal successors, (2387), 7 states have internal predecessors, (2387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:38,562 INFO L175 Difference]: Start difference. First operand has 62 places, 57 transitions, 151 flow. Second operand 6 states and 952 transitions. [2023-08-26 18:46:38,562 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 66 places, 122 transitions, 499 flow [2023-08-26 18:46:38,563 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 65 places, 122 transitions, 497 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:46:38,565 INFO L231 Difference]: Finished difference. Result has 65 places, 59 transitions, 173 flow [2023-08-26 18:46:38,565 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=341, PETRI_DIFFERENCE_MINUEND_FLOW=145, PETRI_DIFFERENCE_MINUEND_PLACES=60, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=51, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=173, PETRI_PLACES=65, PETRI_TRANSITIONS=59} [2023-08-26 18:46:38,565 INFO L281 CegarLoopForPetriNet]: 65 programPoint places, 0 predicate places. [2023-08-26 18:46:38,565 INFO L495 AbstractCegarLoop]: Abstraction has has 65 places, 59 transitions, 173 flow [2023-08-26 18:46:38,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 141.875) internal successors, (1135), 8 states have internal predecessors, (1135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:38,566 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:38,566 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 18:46:38,573 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-08-26 18:46:38,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:46:38,772 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:38,772 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:38,772 INFO L85 PathProgramCache]: Analyzing trace with hash -177591904, now seen corresponding path program 1 times [2023-08-26 18:46:38,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:38,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225497424] [2023-08-26 18:46:38,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:38,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:38,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:38,857 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-08-26 18:46:38,857 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:38,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225497424] [2023-08-26 18:46:38,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225497424] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:46:38,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856103546] [2023-08-26 18:46:38,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:38,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:46:38,858 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:46:38,861 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:46:38,864 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-08-26 18:46:38,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:38,936 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:46:38,937 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:46:38,968 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:38,968 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:46:39,015 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:39,015 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856103546] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:46:39,015 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:46:39,015 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 11 [2023-08-26 18:46:39,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359498759] [2023-08-26 18:46:39,017 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:46:39,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-08-26 18:46:39,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:39,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-08-26 18:46:39,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2023-08-26 18:46:39,020 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 134 out of 341 [2023-08-26 18:46:39,022 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 65 places, 59 transitions, 173 flow. Second operand has 12 states, 12 states have (on average 136.33333333333334) internal successors, (1636), 12 states have internal predecessors, (1636), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:39,022 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:39,022 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 134 of 341 [2023-08-26 18:46:39,022 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:39,495 INFO L124 PetriNetUnfolderBase]: 3352/5486 cut-off events. [2023-08-26 18:46:39,495 INFO L125 PetriNetUnfolderBase]: For 2676/2676 co-relation queries the response was YES. [2023-08-26 18:46:39,501 INFO L83 FinitePrefix]: Finished finitePrefix Result has 11617 conditions, 5486 events. 3352/5486 cut-off events. For 2676/2676 co-relation queries the response was YES. Maximal size of possible extension queue 206. Compared 35305 event pairs, 355 based on Foata normal form. 504/5797 useless extension candidates. Maximal degree in co-relation 11605. Up to 3178 conditions per place. [2023-08-26 18:46:39,505 INFO L140 encePairwiseOnDemand]: 337/341 looper letters, 0 selfloop transitions, 0 changer transitions 85/85 dead transitions. [2023-08-26 18:46:39,505 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 59 places, 85 transitions, 343 flow [2023-08-26 18:46:39,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:46:39,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:46:39,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 879 transitions. [2023-08-26 18:46:39,507 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42961876832844575 [2023-08-26 18:46:39,507 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 879 transitions. [2023-08-26 18:46:39,508 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 879 transitions. [2023-08-26 18:46:39,508 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:39,508 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 879 transitions. [2023-08-26 18:46:39,510 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 146.5) internal successors, (879), 6 states have internal predecessors, (879), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:39,513 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 341.0) internal successors, (2387), 7 states have internal predecessors, (2387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:39,513 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 341.0) internal successors, (2387), 7 states have internal predecessors, (2387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:39,514 INFO L175 Difference]: Start difference. First operand has 65 places, 59 transitions, 173 flow. Second operand 6 states and 879 transitions. [2023-08-26 18:46:39,514 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 59 places, 85 transitions, 343 flow [2023-08-26 18:46:39,515 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 56 places, 85 transitions, 332 flow, removed 3 selfloop flow, removed 3 redundant places. [2023-08-26 18:46:39,516 INFO L231 Difference]: Finished difference. Result has 56 places, 0 transitions, 0 flow [2023-08-26 18:46:39,516 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=341, PETRI_DIFFERENCE_MINUEND_FLOW=104, PETRI_DIFFERENCE_MINUEND_PLACES=51, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=42, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=42, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=56, PETRI_TRANSITIONS=0} [2023-08-26 18:46:39,516 INFO L281 CegarLoopForPetriNet]: 65 programPoint places, -9 predicate places. [2023-08-26 18:46:39,517 INFO L495 AbstractCegarLoop]: Abstraction has has 56 places, 0 transitions, 0 flow [2023-08-26 18:46:39,517 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 136.33333333333334) internal successors, (1636), 12 states have internal predecessors, (1636), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:39,517 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:46:39,517 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:46:39,518 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:46:39,518 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:46:39,518 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:46:39,528 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-08-26 18:46:39,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:46:39,724 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 18:46:39,724 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:46:39,725 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:39,750 INFO L124 PetriNetUnfolderBase]: 66/438 cut-off events. [2023-08-26 18:46:39,750 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:46:39,752 INFO L83 FinitePrefix]: Finished finitePrefix Result has 466 conditions, 438 events. 66/438 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1528 event pairs, 1 based on Foata normal form. 0/340 useless extension candidates. Maximal degree in co-relation 300. Up to 16 conditions per place. [2023-08-26 18:46:39,752 INFO L82 GeneralOperation]: Start removeDead. Operand has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:39,754 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:39,754 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:46:39,754 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:39,754 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:39,755 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:39,783 INFO L124 PetriNetUnfolderBase]: 66/438 cut-off events. [2023-08-26 18:46:39,783 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:46:39,785 INFO L83 FinitePrefix]: Finished finitePrefix Result has 466 conditions, 438 events. 66/438 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1528 event pairs, 1 based on Foata normal form. 0/340 useless extension candidates. Maximal degree in co-relation 300. Up to 16 conditions per place. [2023-08-26 18:46:39,791 INFO L119 LiptonReduction]: Number of co-enabled transitions 15624 [2023-08-26 18:46:42,543 INFO L134 LiptonReduction]: Checked pairs total: 38751 [2023-08-26 18:46:42,543 INFO L136 LiptonReduction]: Total number of compositions: 147 [2023-08-26 18:46:42,544 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:46:42,544 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;@3c69cd49, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:46:42,545 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:46:42,552 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:46:42,552 INFO L124 PetriNetUnfolderBase]: 29/123 cut-off events. [2023-08-26 18:46:42,552 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 18:46:42,552 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:42,552 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 18:46:42,553 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:46:42,553 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:42,553 INFO L85 PathProgramCache]: Analyzing trace with hash -451556412, now seen corresponding path program 1 times [2023-08-26 18:46:42,553 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:42,553 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931498703] [2023-08-26 18:46:42,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:42,553 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:42,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:46:42,574 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:46:42,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:46:42,596 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:46:42,596 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:46:42,596 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:46:42,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 18:46:42,596 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:46:42,597 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:46:42,597 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:46:42,597 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 18:46:42,618 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 18:46:42,620 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 193 places, 221 transitions, 486 flow [2023-08-26 18:46:42,697 INFO L124 PetriNetUnfolderBase]: 101/660 cut-off events. [2023-08-26 18:46:42,697 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:46:42,701 INFO L83 FinitePrefix]: Finished finitePrefix Result has 715 conditions, 660 events. 101/660 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2670 event pairs, 6 based on Foata normal form. 0/512 useless extension candidates. Maximal degree in co-relation 458. Up to 32 conditions per place. [2023-08-26 18:46:42,702 INFO L82 GeneralOperation]: Start removeDead. Operand has 193 places, 221 transitions, 486 flow [2023-08-26 18:46:42,707 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 193 places, 221 transitions, 486 flow [2023-08-26 18:46:42,707 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:46:42,708 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 193 places, 221 transitions, 486 flow [2023-08-26 18:46:42,708 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 193 places, 221 transitions, 486 flow [2023-08-26 18:46:42,708 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 193 places, 221 transitions, 486 flow [2023-08-26 18:46:42,773 INFO L124 PetriNetUnfolderBase]: 101/660 cut-off events. [2023-08-26 18:46:42,773 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:46:42,777 INFO L83 FinitePrefix]: Finished finitePrefix Result has 715 conditions, 660 events. 101/660 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2670 event pairs, 6 based on Foata normal form. 0/512 useless extension candidates. Maximal degree in co-relation 458. Up to 32 conditions per place. [2023-08-26 18:46:42,792 INFO L119 LiptonReduction]: Number of co-enabled transitions 24304 [2023-08-26 18:46:46,053 INFO L134 LiptonReduction]: Checked pairs total: 71717 [2023-08-26 18:46:46,053 INFO L136 LiptonReduction]: Total number of compositions: 162 [2023-08-26 18:46:46,054 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:46:46,054 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;@3c69cd49, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:46:46,054 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:46:46,055 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:46:46,055 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:46:46,056 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:46:46,056 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:46,056 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:46:46,056 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:46,056 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:46,056 INFO L85 PathProgramCache]: Analyzing trace with hash 64720, now seen corresponding path program 1 times [2023-08-26 18:46:46,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:46,056 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [710662368] [2023-08-26 18:46:46,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:46,057 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:46,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:46,099 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:46,099 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:46,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [710662368] [2023-08-26 18:46:46,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [710662368] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:46:46,099 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:46:46,099 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:46:46,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172666098] [2023-08-26 18:46:46,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:46:46,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:46:46,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:46,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:46:46,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:46:46,101 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 162 out of 383 [2023-08-26 18:46:46,102 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 103 transitions, 250 flow. Second operand has 3 states, 3 states have (on average 162.66666666666666) internal successors, (488), 3 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:46,102 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:46,102 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 162 of 383 [2023-08-26 18:46:46,102 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:47:24,092 INFO L124 PetriNetUnfolderBase]: 423266/586220 cut-off events. [2023-08-26 18:47:24,092 INFO L125 PetriNetUnfolderBase]: For 14778/14778 co-relation queries the response was YES. [2023-08-26 18:47:24,969 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1144804 conditions, 586220 events. 423266/586220 cut-off events. For 14778/14778 co-relation queries the response was YES. Maximal size of possible extension queue 12905. Compared 4764516 event pairs, 307598 based on Foata normal form. 101616/615680 useless extension candidates. Maximal degree in co-relation 100121. Up to 550266 conditions per place. [2023-08-26 18:47:26,995 INFO L140 encePairwiseOnDemand]: 350/383 looper letters, 65 selfloop transitions, 2 changer transitions 3/85 dead transitions. [2023-08-26 18:47:26,995 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 85 transitions, 352 flow [2023-08-26 18:47:26,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:47:26,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:47:26,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 592 transitions. [2023-08-26 18:47:26,998 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.515230635335074 [2023-08-26 18:47:26,998 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 592 transitions. [2023-08-26 18:47:26,998 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 592 transitions. [2023-08-26 18:47:26,998 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:47:26,998 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 592 transitions. [2023-08-26 18:47:26,999 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 197.33333333333334) internal successors, (592), 3 states have internal predecessors, (592), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:47:27,001 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 383.0) internal successors, (1532), 4 states have internal predecessors, (1532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:47:27,001 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 383.0) internal successors, (1532), 4 states have internal predecessors, (1532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:47:27,001 INFO L175 Difference]: Start difference. First operand has 79 places, 103 transitions, 250 flow. Second operand 3 states and 592 transitions. [2023-08-26 18:47:27,002 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 80 places, 85 transitions, 352 flow [2023-08-26 18:47:27,005 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 80 places, 85 transitions, 352 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:47:27,006 INFO L231 Difference]: Finished difference. Result has 81 places, 72 transitions, 194 flow [2023-08-26 18:47:27,006 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=192, PETRI_DIFFERENCE_MINUEND_PLACES=78, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=74, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=72, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=194, PETRI_PLACES=81, PETRI_TRANSITIONS=72} [2023-08-26 18:47:27,006 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, 2 predicate places. [2023-08-26 18:47:27,007 INFO L495 AbstractCegarLoop]: Abstraction has has 81 places, 72 transitions, 194 flow [2023-08-26 18:47:27,007 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 162.66666666666666) internal successors, (488), 3 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:47:27,007 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:47:27,007 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:47:27,007 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-26 18:47:27,007 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:47:27,008 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:47:27,008 INFO L85 PathProgramCache]: Analyzing trace with hash 64721, now seen corresponding path program 1 times [2023-08-26 18:47:27,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:47:27,008 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476234671] [2023-08-26 18:47:27,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:47:27,008 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:47:27,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:47:27,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:47:27,034 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:47:27,034 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476234671] [2023-08-26 18:47:27,034 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [476234671] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:47:27,034 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:47:27,034 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:47:27,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476768694] [2023-08-26 18:47:27,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:47:27,034 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:47:27,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:47:27,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:47:27,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:47:27,036 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 167 out of 383 [2023-08-26 18:47:27,037 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 81 places, 72 transitions, 194 flow. Second operand has 3 states, 3 states have (on average 167.66666666666666) internal successors, (503), 3 states have internal predecessors, (503), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:47:27,037 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:47:27,037 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 167 of 383 [2023-08-26 18:47:27,037 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:47:55,140 INFO L124 PetriNetUnfolderBase]: 321014/444386 cut-off events. [2023-08-26 18:47:55,141 INFO L125 PetriNetUnfolderBase]: For 26140/26140 co-relation queries the response was YES. [2023-08-26 18:47:56,262 INFO L83 FinitePrefix]: Finished finitePrefix Result has 894861 conditions, 444386 events. 321014/444386 cut-off events. For 26140/26140 co-relation queries the response was YES. Maximal size of possible extension queue 9871. Compared 3509125 event pairs, 313434 based on Foata normal form. 0/411112 useless extension candidates. Maximal degree in co-relation 894788. Up to 416884 conditions per place. [2023-08-26 18:47:58,374 INFO L140 encePairwiseOnDemand]: 380/383 looper letters, 54 selfloop transitions, 1 changer transitions 0/70 dead transitions. [2023-08-26 18:47:58,375 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 70 transitions, 300 flow [2023-08-26 18:47:58,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:47:58,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:47:58,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 557 transitions. [2023-08-26 18:47:58,380 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48476936466492604 [2023-08-26 18:47:58,380 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 557 transitions. [2023-08-26 18:47:58,380 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 557 transitions. [2023-08-26 18:47:58,383 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:47:58,383 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 557 transitions. [2023-08-26 18:47:58,385 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 185.66666666666666) internal successors, (557), 3 states have internal predecessors, (557), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:47:58,387 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 383.0) internal successors, (1532), 4 states have internal predecessors, (1532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:47:58,387 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 383.0) internal successors, (1532), 4 states have internal predecessors, (1532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:47:58,387 INFO L175 Difference]: Start difference. First operand has 81 places, 72 transitions, 194 flow. Second operand 3 states and 557 transitions. [2023-08-26 18:47:58,387 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 70 transitions, 300 flow [2023-08-26 18:47:58,552 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 76 places, 70 transitions, 296 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:47:58,554 INFO L231 Difference]: Finished difference. Result has 76 places, 70 transitions, 188 flow [2023-08-26 18:47:58,555 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=186, PETRI_DIFFERENCE_MINUEND_PLACES=74, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=69, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=188, PETRI_PLACES=76, PETRI_TRANSITIONS=70} [2023-08-26 18:47:58,555 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, -3 predicate places. [2023-08-26 18:47:58,555 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 70 transitions, 188 flow [2023-08-26 18:47:58,556 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 167.66666666666666) internal successors, (503), 3 states have internal predecessors, (503), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:47:58,556 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:47:58,556 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:47:58,556 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-26 18:47:58,556 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:47:58,556 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:47:58,556 INFO L85 PathProgramCache]: Analyzing trace with hash -301398494, now seen corresponding path program 1 times [2023-08-26 18:47:58,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:47:58,556 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781683089] [2023-08-26 18:47:58,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:47:58,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:47:58,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:47:58,654 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:47:58,654 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:47:58,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781683089] [2023-08-26 18:47:58,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [781683089] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:47:58,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778372160] [2023-08-26 18:47:58,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:47:58,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:47:58,655 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:47:58,659 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:47:58,661 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-08-26 18:47:58,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:47:58,788 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:47:58,789 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:47:58,814 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:47:58,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:47:58,862 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:47:58,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:47:58,906 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778372160] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:47:58,906 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:47:58,906 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-08-26 18:47:58,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242903941] [2023-08-26 18:47:58,906 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:47:58,907 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 18:47:58,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:47:58,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 18:47:58,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-08-26 18:47:58,917 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 162 out of 383 [2023-08-26 18:47:58,918 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 70 transitions, 188 flow. Second operand has 7 states, 7 states have (on average 163.71428571428572) internal successors, (1146), 7 states have internal predecessors, (1146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:47:58,918 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:47:58,918 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 162 of 383 [2023-08-26 18:47:58,918 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:48:24,613 INFO L124 PetriNetUnfolderBase]: 319077/422289 cut-off events. [2023-08-26 18:48:24,613 INFO L125 PetriNetUnfolderBase]: For 13529/13529 co-relation queries the response was YES. [2023-08-26 18:48:25,302 INFO L83 FinitePrefix]: Finished finitePrefix Result has 868623 conditions, 422289 events. 319077/422289 cut-off events. For 13529/13529 co-relation queries the response was YES. Maximal size of possible extension queue 9260. Compared 3129637 event pairs, 5515 based on Foata normal form. 9/394341 useless extension candidates. Maximal degree in co-relation 868611. Up to 359184 conditions per place. [2023-08-26 18:48:26,823 INFO L140 encePairwiseOnDemand]: 377/383 looper letters, 133 selfloop transitions, 9 changer transitions 1/158 dead transitions. [2023-08-26 18:48:26,823 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 81 places, 158 transitions, 662 flow [2023-08-26 18:48:26,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:48:26,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:48:26,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1120 transitions. [2023-08-26 18:48:26,826 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48738033072236725 [2023-08-26 18:48:26,827 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1120 transitions. [2023-08-26 18:48:26,827 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1120 transitions. [2023-08-26 18:48:26,827 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:48:26,827 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1120 transitions. [2023-08-26 18:48:26,829 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 186.66666666666666) internal successors, (1120), 6 states have internal predecessors, (1120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:48:26,832 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 383.0) internal successors, (2681), 7 states have internal predecessors, (2681), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:48:26,833 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 383.0) internal successors, (2681), 7 states have internal predecessors, (2681), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:48:26,833 INFO L175 Difference]: Start difference. First operand has 76 places, 70 transitions, 188 flow. Second operand 6 states and 1120 transitions. [2023-08-26 18:48:26,833 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 81 places, 158 transitions, 662 flow [2023-08-26 18:48:26,837 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 80 places, 158 transitions, 661 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:48:26,838 INFO L231 Difference]: Finished difference. Result has 84 places, 76 transitions, 257 flow [2023-08-26 18:48:26,838 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=187, PETRI_DIFFERENCE_MINUEND_PLACES=75, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=65, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=257, PETRI_PLACES=84, PETRI_TRANSITIONS=76} [2023-08-26 18:48:26,839 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, 5 predicate places. [2023-08-26 18:48:26,839 INFO L495 AbstractCegarLoop]: Abstraction has has 84 places, 76 transitions, 257 flow [2023-08-26 18:48:26,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 163.71428571428572) internal successors, (1146), 7 states have internal predecessors, (1146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:48:26,839 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:48:26,839 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 18:48:26,844 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-08-26 18:48:27,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-08-26 18:48:27,041 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:48:27,042 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:48:27,042 INFO L85 PathProgramCache]: Analyzing trace with hash -479018419, now seen corresponding path program 1 times [2023-08-26 18:48:27,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:48:27,042 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267335432] [2023-08-26 18:48:27,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:48:27,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:48:27,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:48:27,097 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 18:48:27,097 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:48:27,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267335432] [2023-08-26 18:48:27,097 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267335432] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:48:27,097 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:48:27,097 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:48:27,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124147034] [2023-08-26 18:48:27,098 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:48:27,098 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:48:27,098 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:48:27,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:48:27,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:48:27,099 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 162 out of 383 [2023-08-26 18:48:27,100 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 84 places, 76 transitions, 257 flow. Second operand has 4 states, 4 states have (on average 164.0) internal successors, (656), 4 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:48:27,100 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:48:27,100 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 162 of 383 [2023-08-26 18:48:27,100 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:48:54,549 INFO L124 PetriNetUnfolderBase]: 281421/383522 cut-off events. [2023-08-26 18:48:54,550 INFO L125 PetriNetUnfolderBase]: For 127129/127129 co-relation queries the response was YES. [2023-08-26 18:48:55,616 INFO L83 FinitePrefix]: Finished finitePrefix Result has 828431 conditions, 383522 events. 281421/383522 cut-off events. For 127129/127129 co-relation queries the response was YES. Maximal size of possible extension queue 8358. Compared 2918441 event pairs, 221543 based on Foata normal form. 0/363605 useless extension candidates. Maximal degree in co-relation 828414. Up to 291386 conditions per place. [2023-08-26 18:48:57,090 INFO L140 encePairwiseOnDemand]: 378/383 looper letters, 94 selfloop transitions, 4 changer transitions 0/113 dead transitions. [2023-08-26 18:48:57,090 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 87 places, 113 transitions, 538 flow [2023-08-26 18:48:57,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:48:57,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:48:57,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 740 transitions. [2023-08-26 18:48:57,092 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4830287206266319 [2023-08-26 18:48:57,092 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 740 transitions. [2023-08-26 18:48:57,092 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 740 transitions. [2023-08-26 18:48:57,092 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:48:57,093 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 740 transitions. [2023-08-26 18:48:57,094 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 185.0) internal successors, (740), 4 states have internal predecessors, (740), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:48:57,096 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 383.0) internal successors, (1915), 5 states have internal predecessors, (1915), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:48:57,097 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 383.0) internal successors, (1915), 5 states have internal predecessors, (1915), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:48:57,097 INFO L175 Difference]: Start difference. First operand has 84 places, 76 transitions, 257 flow. Second operand 4 states and 740 transitions. [2023-08-26 18:48:57,097 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 87 places, 113 transitions, 538 flow [2023-08-26 18:48:57,189 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 85 places, 113 transitions, 519 flow, removed 7 selfloop flow, removed 2 redundant places. [2023-08-26 18:48:57,190 INFO L231 Difference]: Finished difference. Result has 86 places, 77 transitions, 256 flow [2023-08-26 18:48:57,190 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=239, PETRI_DIFFERENCE_MINUEND_PLACES=82, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=76, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=72, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=256, PETRI_PLACES=86, PETRI_TRANSITIONS=77} [2023-08-26 18:48:57,190 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, 7 predicate places. [2023-08-26 18:48:57,191 INFO L495 AbstractCegarLoop]: Abstraction has has 86 places, 77 transitions, 256 flow [2023-08-26 18:48:57,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 164.0) internal successors, (656), 4 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:48:57,191 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:48:57,191 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 18:48:57,191 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-26 18:48:57,191 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:48:57,192 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:48:57,192 INFO L85 PathProgramCache]: Analyzing trace with hash -479020479, now seen corresponding path program 1 times [2023-08-26 18:48:57,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:48:57,192 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738731884] [2023-08-26 18:48:57,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:48:57,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:48:57,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:48:57,253 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 18:48:57,253 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:48:57,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738731884] [2023-08-26 18:48:57,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738731884] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:48:57,254 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:48:57,254 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:48:57,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522703434] [2023-08-26 18:48:57,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:48:57,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:48:57,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:48:57,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:48:57,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:48:57,255 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 164 out of 383 [2023-08-26 18:48:57,256 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 86 places, 77 transitions, 256 flow. Second operand has 3 states, 3 states have (on average 166.66666666666666) internal successors, (500), 3 states have internal predecessors, (500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:48:57,256 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:48:57,256 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 164 of 383 [2023-08-26 18:48:57,256 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:38,710 INFO L124 PetriNetUnfolderBase]: 516237/672389 cut-off events. [2023-08-26 18:49:38,711 INFO L125 PetriNetUnfolderBase]: For 277098/277098 co-relation queries the response was YES. [2023-08-26 18:49:41,082 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1504524 conditions, 672389 events. 516237/672389 cut-off events. For 277098/277098 co-relation queries the response was YES. Maximal size of possible extension queue 12291. Compared 4614526 event pairs, 244354 based on Foata normal form. 0/648380 useless extension candidates. Maximal degree in co-relation 1504506. Up to 660963 conditions per place. [2023-08-26 18:49:44,706 INFO L140 encePairwiseOnDemand]: 377/383 looper letters, 98 selfloop transitions, 5 changer transitions 0/112 dead transitions. [2023-08-26 18:49:44,715 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 88 places, 112 transitions, 607 flow [2023-08-26 18:49:44,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:44,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:44,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 581 transitions. [2023-08-26 18:49:44,733 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5056570931244561 [2023-08-26 18:49:44,733 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 581 transitions. [2023-08-26 18:49:44,733 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 581 transitions. [2023-08-26 18:49:44,733 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:44,733 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 581 transitions. [2023-08-26 18:49:44,735 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 193.66666666666666) internal successors, (581), 3 states have internal predecessors, (581), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:44,736 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 383.0) internal successors, (1532), 4 states have internal predecessors, (1532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:44,737 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 383.0) internal successors, (1532), 4 states have internal predecessors, (1532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:44,737 INFO L175 Difference]: Start difference. First operand has 86 places, 77 transitions, 256 flow. Second operand 3 states and 581 transitions. [2023-08-26 18:49:44,737 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 88 places, 112 transitions, 607 flow [2023-08-26 18:49:54,208 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 86 places, 112 transitions, 600 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:49:54,209 INFO L231 Difference]: Finished difference. Result has 87 places, 81 transitions, 284 flow [2023-08-26 18:49:54,209 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=251, PETRI_DIFFERENCE_MINUEND_PLACES=84, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=77, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=72, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=284, PETRI_PLACES=87, PETRI_TRANSITIONS=81} [2023-08-26 18:49:54,210 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, 8 predicate places. [2023-08-26 18:49:54,210 INFO L495 AbstractCegarLoop]: Abstraction has has 87 places, 81 transitions, 284 flow [2023-08-26 18:49:54,210 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 166.66666666666666) internal successors, (500), 3 states have internal predecessors, (500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:54,210 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:54,210 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:49:54,211 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-08-26 18:49:54,211 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:49:54,211 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:54,211 INFO L85 PathProgramCache]: Analyzing trace with hash -1636466249, now seen corresponding path program 1 times [2023-08-26 18:49:54,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:54,211 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467607643] [2023-08-26 18:49:54,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:54,211 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:54,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:54,287 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:54,287 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:54,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467607643] [2023-08-26 18:49:54,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467607643] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:49:54,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499898574] [2023-08-26 18:49:54,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:54,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:49:54,288 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:49:54,317 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:49:54,377 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-08-26 18:49:54,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:54,488 INFO L262 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:49:54,489 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:49:54,507 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:54,507 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:49:54,555 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:54,555 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499898574] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:49:54,555 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:49:54,555 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-08-26 18:49:54,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802086755] [2023-08-26 18:49:54,556 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:49:54,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-08-26 18:49:54,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:54,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-08-26 18:49:54,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2023-08-26 18:49:54,558 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 173 out of 383 [2023-08-26 18:49:54,559 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 87 places, 81 transitions, 284 flow. Second operand has 9 states, 9 states have (on average 176.0) internal successors, (1584), 9 states have internal predecessors, (1584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:54,559 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:54,559 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 173 of 383 [2023-08-26 18:49:54,559 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:59,925 INFO L124 PetriNetUnfolderBase]: 61747/84496 cut-off events. [2023-08-26 18:49:59,925 INFO L125 PetriNetUnfolderBase]: For 47899/47899 co-relation queries the response was YES. [2023-08-26 18:50:00,157 INFO L83 FinitePrefix]: Finished finitePrefix Result has 215301 conditions, 84496 events. 61747/84496 cut-off events. For 47899/47899 co-relation queries the response was YES. Maximal size of possible extension queue 2179. Compared 566274 event pairs, 0 based on Foata normal form. 6561/91056 useless extension candidates. Maximal degree in co-relation 215288. Up to 52974 conditions per place. [2023-08-26 18:50:00,422 INFO L140 encePairwiseOnDemand]: 379/383 looper letters, 131 selfloop transitions, 5 changer transitions 0/150 dead transitions. [2023-08-26 18:50:00,423 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 81 places, 150 transitions, 702 flow [2023-08-26 18:50:00,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 18:50:00,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 18:50:00,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1340 transitions. [2023-08-26 18:50:00,425 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4998135024244685 [2023-08-26 18:50:00,425 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1340 transitions. [2023-08-26 18:50:00,425 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1340 transitions. [2023-08-26 18:50:00,426 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:50:00,426 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1340 transitions. [2023-08-26 18:50:00,428 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 191.42857142857142) internal successors, (1340), 7 states have internal predecessors, (1340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:00,431 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 383.0) internal successors, (3064), 8 states have internal predecessors, (3064), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:00,431 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 383.0) internal successors, (3064), 8 states have internal predecessors, (3064), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:00,431 INFO L175 Difference]: Start difference. First operand has 87 places, 81 transitions, 284 flow. Second operand 7 states and 1340 transitions. [2023-08-26 18:50:00,431 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 81 places, 150 transitions, 702 flow [2023-08-26 18:50:00,454 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 150 transitions, 679 flow, removed 3 selfloop flow, removed 2 redundant places. [2023-08-26 18:50:00,455 INFO L231 Difference]: Finished difference. Result has 79 places, 60 transitions, 193 flow [2023-08-26 18:50:00,456 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=183, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=60, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=193, PETRI_PLACES=79, PETRI_TRANSITIONS=60} [2023-08-26 18:50:00,456 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, 0 predicate places. [2023-08-26 18:50:00,456 INFO L495 AbstractCegarLoop]: Abstraction has has 79 places, 60 transitions, 193 flow [2023-08-26 18:50:00,457 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 176.0) internal successors, (1584), 9 states have internal predecessors, (1584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:00,457 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:00,457 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 18:50:00,465 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-08-26 18:50:00,662 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:50:00,662 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:50:00,663 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:00,663 INFO L85 PathProgramCache]: Analyzing trace with hash 1643292754, now seen corresponding path program 1 times [2023-08-26 18:50:00,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:00,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28352558] [2023-08-26 18:50:00,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:00,664 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:00,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:00,826 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:50:00,827 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:50:00,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28352558] [2023-08-26 18:50:00,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [28352558] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:50:00,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [798765881] [2023-08-26 18:50:00,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:00,827 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:50:00,827 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:50:00,828 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:50:01,121 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-08-26 18:50:01,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:01,205 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 15 conjunts are in the unsatisfiable core [2023-08-26 18:50:01,206 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:50:01,215 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:50:01,317 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:50:01,317 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:50:01,427 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:50:01,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [798765881] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:50:01,428 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:50:01,428 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 14 [2023-08-26 18:50:01,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978623623] [2023-08-26 18:50:01,428 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:50:01,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-08-26 18:50:01,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:50:01,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-08-26 18:50:01,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2023-08-26 18:50:01,431 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 162 out of 383 [2023-08-26 18:50:01,433 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 60 transitions, 193 flow. Second operand has 16 states, 16 states have (on average 164.4375) internal successors, (2631), 16 states have internal predecessors, (2631), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:01,433 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:50:01,433 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 162 of 383 [2023-08-26 18:50:01,433 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:50:05,099 INFO L124 PetriNetUnfolderBase]: 41092/57397 cut-off events. [2023-08-26 18:50:05,099 INFO L125 PetriNetUnfolderBase]: For 63283/63289 co-relation queries the response was YES. [2023-08-26 18:50:05,223 INFO L83 FinitePrefix]: Finished finitePrefix Result has 134649 conditions, 57397 events. 41092/57397 cut-off events. For 63283/63289 co-relation queries the response was YES. Maximal size of possible extension queue 1542. Compared 379349 event pairs, 2172 based on Foata normal form. 5832/63213 useless extension candidates. Maximal degree in co-relation 134637. Up to 26487 conditions per place. [2023-08-26 18:50:05,255 INFO L140 encePairwiseOnDemand]: 380/383 looper letters, 0 selfloop transitions, 0 changer transitions 149/149 dead transitions. [2023-08-26 18:50:05,255 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 84 places, 149 transitions, 677 flow [2023-08-26 18:50:05,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 18:50:05,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 18:50:05,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1257 transitions. [2023-08-26 18:50:05,258 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4688549048862365 [2023-08-26 18:50:05,258 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1257 transitions. [2023-08-26 18:50:05,258 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1257 transitions. [2023-08-26 18:50:05,259 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:50:05,259 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1257 transitions. [2023-08-26 18:50:05,261 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 179.57142857142858) internal successors, (1257), 7 states have internal predecessors, (1257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:05,263 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 383.0) internal successors, (3064), 8 states have internal predecessors, (3064), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:05,264 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 383.0) internal successors, (3064), 8 states have internal predecessors, (3064), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:05,264 INFO L175 Difference]: Start difference. First operand has 79 places, 60 transitions, 193 flow. Second operand 7 states and 1257 transitions. [2023-08-26 18:50:05,264 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 84 places, 149 transitions, 677 flow [2023-08-26 18:50:05,273 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 75 places, 149 transitions, 660 flow, removed 0 selfloop flow, removed 9 redundant places. [2023-08-26 18:50:05,273 INFO L231 Difference]: Finished difference. Result has 75 places, 0 transitions, 0 flow [2023-08-26 18:50:05,274 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=166, PETRI_DIFFERENCE_MINUEND_PLACES=69, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=59, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=0, PETRI_PLACES=75, PETRI_TRANSITIONS=0} [2023-08-26 18:50:05,274 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, -4 predicate places. [2023-08-26 18:50:05,274 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 0 transitions, 0 flow [2023-08-26 18:50:05,275 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 164.4375) internal successors, (2631), 16 states have internal predecessors, (2631), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:05,275 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:50:05,275 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:50:05,275 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:50:05,275 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:50:05,275 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:50:05,281 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-08-26 18:50:05,481 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:50:05,481 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:50:05,482 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:50:05,483 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 193 places, 221 transitions, 486 flow [2023-08-26 18:50:05,520 INFO L124 PetriNetUnfolderBase]: 101/660 cut-off events. [2023-08-26 18:50:05,520 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:50:05,523 INFO L83 FinitePrefix]: Finished finitePrefix Result has 715 conditions, 660 events. 101/660 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2670 event pairs, 6 based on Foata normal form. 0/512 useless extension candidates. Maximal degree in co-relation 458. Up to 32 conditions per place. [2023-08-26 18:50:05,524 INFO L82 GeneralOperation]: Start removeDead. Operand has 193 places, 221 transitions, 486 flow [2023-08-26 18:50:05,526 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 193 places, 221 transitions, 486 flow [2023-08-26 18:50:05,527 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:50:05,527 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 193 places, 221 transitions, 486 flow [2023-08-26 18:50:05,527 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 193 places, 221 transitions, 486 flow [2023-08-26 18:50:05,527 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 193 places, 221 transitions, 486 flow [2023-08-26 18:50:05,564 INFO L124 PetriNetUnfolderBase]: 101/660 cut-off events. [2023-08-26 18:50:05,564 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:50:05,567 INFO L83 FinitePrefix]: Finished finitePrefix Result has 715 conditions, 660 events. 101/660 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2670 event pairs, 6 based on Foata normal form. 0/512 useless extension candidates. Maximal degree in co-relation 458. Up to 32 conditions per place. [2023-08-26 18:50:05,578 INFO L119 LiptonReduction]: Number of co-enabled transitions 24304 [2023-08-26 18:50:08,744 INFO L134 LiptonReduction]: Checked pairs total: 70782 [2023-08-26 18:50:08,744 INFO L136 LiptonReduction]: Total number of compositions: 165 [2023-08-26 18:50:08,745 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:50:08,745 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;@3c69cd49, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:50:08,745 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:50:08,753 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:50:08,753 INFO L124 PetriNetUnfolderBase]: 44/179 cut-off events. [2023-08-26 18:50:08,753 INFO L125 PetriNetUnfolderBase]: For 23/23 co-relation queries the response was YES. [2023-08-26 18:50:08,753 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:08,753 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 18:50:08,754 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:50:08,754 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:08,754 INFO L85 PathProgramCache]: Analyzing trace with hash 464874835, now seen corresponding path program 1 times [2023-08-26 18:50:08,754 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:08,754 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197311694] [2023-08-26 18:50:08,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:08,754 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:08,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:50:08,767 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:50:08,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:50:08,779 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:50:08,779 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:50:08,780 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:50:08,780 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2023-08-26 18:50:08,780 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:50:08,780 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:50:08,780 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:50:08,780 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-26 18:50:08,799 INFO L144 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2023-08-26 18:50:08,801 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 218 places, 251 transitions, 562 flow [2023-08-26 18:50:08,889 INFO L124 PetriNetUnfolderBase]: 164/1038 cut-off events. [2023-08-26 18:50:08,889 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-26 18:50:08,894 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1149 conditions, 1038 events. 164/1038 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 5041 event pairs, 23 based on Foata normal form. 0/808 useless extension candidates. Maximal degree in co-relation 705. Up to 80 conditions per place. [2023-08-26 18:50:08,894 INFO L82 GeneralOperation]: Start removeDead. Operand has 218 places, 251 transitions, 562 flow [2023-08-26 18:50:08,898 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 218 places, 251 transitions, 562 flow [2023-08-26 18:50:08,898 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:50:08,899 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 218 places, 251 transitions, 562 flow [2023-08-26 18:50:08,899 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 218 places, 251 transitions, 562 flow [2023-08-26 18:50:08,899 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 218 places, 251 transitions, 562 flow [2023-08-26 18:50:09,114 INFO L124 PetriNetUnfolderBase]: 164/1038 cut-off events. [2023-08-26 18:50:09,114 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-26 18:50:09,119 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1149 conditions, 1038 events. 164/1038 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 5041 event pairs, 23 based on Foata normal form. 0/808 useless extension candidates. Maximal degree in co-relation 705. Up to 80 conditions per place. [2023-08-26 18:50:09,133 INFO L119 LiptonReduction]: Number of co-enabled transitions 34720 [2023-08-26 18:50:12,108 INFO L134 LiptonReduction]: Checked pairs total: 95490 [2023-08-26 18:50:12,108 INFO L136 LiptonReduction]: Total number of compositions: 178 [2023-08-26 18:50:12,109 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:50:12,109 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;@3c69cd49, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:50:12,109 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:50:12,110 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:50:12,110 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:50:12,110 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:50:12,110 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:12,110 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:50:12,110 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:50:12,111 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:12,111 INFO L85 PathProgramCache]: Analyzing trace with hash 84718, now seen corresponding path program 1 times [2023-08-26 18:50:12,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:12,111 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052123] [2023-08-26 18:50:12,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:12,111 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:12,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:12,145 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:50:12,145 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:50:12,145 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052123] [2023-08-26 18:50:12,145 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2052123] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:50:12,145 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:50:12,145 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:50:12,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950849172] [2023-08-26 18:50:12,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:50:12,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:50:12,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:50:12,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:50:12,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:50:12,147 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 184 out of 429 [2023-08-26 18:50:12,148 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 93 places, 122 transitions, 304 flow. Second operand has 3 states, 3 states have (on average 184.66666666666666) internal successors, (554), 3 states have internal predecessors, (554), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:12,148 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:50:12,148 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 184 of 429 [2023-08-26 18:50:12,148 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand