/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_42-trylock2_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 18:53:38,793 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 18:53:38,872 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 18:53:38,876 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 18:53:38,877 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 18:53:38,906 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 18:53:38,907 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 18:53:38,907 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 18:53:38,908 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 18:53:38,911 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 18:53:38,911 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 18:53:38,911 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 18:53:38,912 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 18:53:38,913 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 18:53:38,913 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 18:53:38,913 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 18:53:38,913 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 18:53:38,914 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 18:53:38,914 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 18:53:38,914 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 18:53:38,914 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 18:53:38,915 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 18:53:38,915 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 18:53:38,916 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 18:53:38,916 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 18:53:38,916 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 18:53:38,916 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 18:53:38,916 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:53:38,917 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 18:53:38,917 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 18:53:38,918 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 18:53:38,918 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 18:53:38,918 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 18:53:38,918 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 18:53:38,918 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 18:53:38,919 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 18:53:39,196 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 18:53:39,220 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 18:53:39,222 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 18:53:39,223 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 18:53:39,223 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 18:53:39,225 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_42-trylock2_racefree.i [2023-08-26 18:53:40,395 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 18:53:40,645 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 18:53:40,646 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_42-trylock2_racefree.i [2023-08-26 18:53:40,658 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6fa57c60e/10d08f4ce3c74f0683c361625ff6f222/FLAGa8efe03d9 [2023-08-26 18:53:40,669 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6fa57c60e/10d08f4ce3c74f0683c361625ff6f222 [2023-08-26 18:53:40,671 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 18:53:40,672 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 18:53:40,673 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 18:53:40,673 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 18:53:40,675 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 18:53:40,676 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:53:40" (1/1) ... [2023-08-26 18:53:40,677 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79719e53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:40, skipping insertion in model container [2023-08-26 18:53:40,677 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:53:40" (1/1) ... [2023-08-26 18:53:40,711 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 18:53:41,001 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:53:41,020 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 18:53:41,037 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 18:53:41,039 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 18:53:41,055 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:53:41,091 INFO L206 MainTranslator]: Completed translation [2023-08-26 18:53:41,091 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41 WrapperNode [2023-08-26 18:53:41,091 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 18:53:41,092 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 18:53:41,092 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 18:53:41,093 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 18:53:41,098 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41" (1/1) ... [2023-08-26 18:53:41,126 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41" (1/1) ... [2023-08-26 18:53:41,155 INFO L138 Inliner]: procedures = 171, calls = 48, calls flagged for inlining = 7, calls inlined = 10, statements flattened = 144 [2023-08-26 18:53:41,155 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 18:53:41,156 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 18:53:41,157 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 18:53:41,157 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 18:53:41,164 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41" (1/1) ... [2023-08-26 18:53:41,164 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41" (1/1) ... [2023-08-26 18:53:41,173 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41" (1/1) ... [2023-08-26 18:53:41,174 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41" (1/1) ... [2023-08-26 18:53:41,182 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41" (1/1) ... [2023-08-26 18:53:41,187 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41" (1/1) ... [2023-08-26 18:53:41,188 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41" (1/1) ... [2023-08-26 18:53:41,189 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41" (1/1) ... [2023-08-26 18:53:41,198 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 18:53:41,198 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 18:53:41,199 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 18:53:41,199 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 18:53:41,199 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41" (1/1) ... [2023-08-26 18:53:41,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:53:41,214 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:53:41,233 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 18:53:41,244 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 18:53:41,263 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 18:53:41,263 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 18:53:41,264 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 18:53:41,264 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 18:53:41,264 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 18:53:41,264 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 18:53:41,264 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 18:53:41,264 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 18:53:41,265 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexTryLock [2023-08-26 18:53:41,265 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 18:53:41,265 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 18:53:41,266 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 18:53:41,267 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 18:53:41,401 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 18:53:41,402 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 18:53:41,718 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 18:53:41,725 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 18:53:41,725 INFO L302 CfgBuilder]: Removed 23 assume(true) statements. [2023-08-26 18:53:41,727 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:53:41 BoogieIcfgContainer [2023-08-26 18:53:41,727 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 18:53:41,729 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 18:53:41,729 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 18:53:41,732 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 18:53:41,732 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 06:53:40" (1/3) ... [2023-08-26 18:53:41,732 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e3907cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:53:41, skipping insertion in model container [2023-08-26 18:53:41,732 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:53:41" (2/3) ... [2023-08-26 18:53:41,733 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e3907cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:53:41, skipping insertion in model container [2023-08-26 18:53:41,733 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:53:41" (3/3) ... [2023-08-26 18:53:41,734 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_42-trylock2_racefree.i [2023-08-26 18:53:41,746 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 18:53:41,746 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2023-08-26 18:53:41,746 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 18:53:41,797 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 18:53:41,828 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 176 places, 206 transitions, 420 flow [2023-08-26 18:53:41,903 INFO L124 PetriNetUnfolderBase]: 53/313 cut-off events. [2023-08-26 18:53:41,904 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:53:41,910 INFO L83 FinitePrefix]: Finished finitePrefix Result has 319 conditions, 313 events. 53/313 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 1260 event pairs, 0 based on Foata normal form. 0/241 useless extension candidates. Maximal degree in co-relation 165. Up to 6 conditions per place. [2023-08-26 18:53:41,910 INFO L82 GeneralOperation]: Start removeDead. Operand has 176 places, 206 transitions, 420 flow [2023-08-26 18:53:41,915 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 176 places, 206 transitions, 420 flow [2023-08-26 18:53:41,918 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:53:41,926 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 176 places, 206 transitions, 420 flow [2023-08-26 18:53:41,928 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 176 places, 206 transitions, 420 flow [2023-08-26 18:53:41,929 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 176 places, 206 transitions, 420 flow [2023-08-26 18:53:41,989 INFO L124 PetriNetUnfolderBase]: 53/313 cut-off events. [2023-08-26 18:53:41,989 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:53:41,991 INFO L83 FinitePrefix]: Finished finitePrefix Result has 319 conditions, 313 events. 53/313 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 1260 event pairs, 0 based on Foata normal form. 0/241 useless extension candidates. Maximal degree in co-relation 165. Up to 6 conditions per place. [2023-08-26 18:53:41,998 INFO L119 LiptonReduction]: Number of co-enabled transitions 11978 [2023-08-26 18:53:45,518 INFO L134 LiptonReduction]: Checked pairs total: 24858 [2023-08-26 18:53:45,519 INFO L136 LiptonReduction]: Total number of compositions: 177 [2023-08-26 18:53:45,530 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:53:45,535 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;@1e2ee6e3, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:53:45,535 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-08-26 18:53:45,536 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:53:45,537 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:53:45,537 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:53:45,537 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:45,537 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:53:45,538 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:53:45,541 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:45,541 INFO L85 PathProgramCache]: Analyzing trace with hash 25818, now seen corresponding path program 1 times [2023-08-26 18:53:45,547 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:45,547 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083280376] [2023-08-26 18:53:45,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:45,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:45,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:45,758 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:45,758 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:53:45,758 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083280376] [2023-08-26 18:53:45,759 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2083280376] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:53:45,759 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:53:45,759 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:53:45,760 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049043410] [2023-08-26 18:53:45,760 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:53:45,765 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:53:45,768 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:53:45,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:53:45,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:53:45,787 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 153 out of 383 [2023-08-26 18:53:45,789 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 81 transitions, 170 flow. Second operand has 3 states, 3 states have (on average 153.66666666666666) internal successors, (461), 3 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:45,789 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:53:45,790 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 153 of 383 [2023-08-26 18:53:45,790 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:53:45,946 INFO L124 PetriNetUnfolderBase]: 438/1016 cut-off events. [2023-08-26 18:53:45,946 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:53:45,948 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1956 conditions, 1016 events. 438/1016 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 37. Compared 5178 event pairs, 405 based on Foata normal form. 160/967 useless extension candidates. Maximal degree in co-relation 1876. Up to 899 conditions per place. [2023-08-26 18:53:45,953 INFO L140 encePairwiseOnDemand]: 356/383 looper letters, 43 selfloop transitions, 1 changer transitions 20/71 dead transitions. [2023-08-26 18:53:45,953 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 59 places, 71 transitions, 276 flow [2023-08-26 18:53:45,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:53:45,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:53:45,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 559 transitions. [2023-08-26 18:53:45,965 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4865100087032202 [2023-08-26 18:53:45,966 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 559 transitions. [2023-08-26 18:53:45,966 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 559 transitions. [2023-08-26 18:53:45,968 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:53:45,970 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 559 transitions. [2023-08-26 18:53:45,975 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 186.33333333333334) internal successors, (559), 3 states have internal predecessors, (559), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:45,981 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 18:53:45,982 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 18:53:45,983 INFO L175 Difference]: Start difference. First operand has 59 places, 81 transitions, 170 flow. Second operand 3 states and 559 transitions. [2023-08-26 18:53:45,984 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 59 places, 71 transitions, 276 flow [2023-08-26 18:53:45,987 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 59 places, 71 transitions, 276 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:53:45,989 INFO L231 Difference]: Finished difference. Result has 59 places, 51 transitions, 110 flow [2023-08-26 18:53:45,991 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=120, PETRI_DIFFERENCE_MINUEND_PLACES=57, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=110, PETRI_PLACES=59, PETRI_TRANSITIONS=51} [2023-08-26 18:53:45,994 INFO L281 CegarLoopForPetriNet]: 59 programPoint places, 0 predicate places. [2023-08-26 18:53:45,994 INFO L495 AbstractCegarLoop]: Abstraction has has 59 places, 51 transitions, 110 flow [2023-08-26 18:53:45,994 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 153.66666666666666) internal successors, (461), 3 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:45,995 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:45,995 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:53:45,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 18:53:45,995 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:53:45,996 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:45,997 INFO L85 PathProgramCache]: Analyzing trace with hash 25819, now seen corresponding path program 1 times [2023-08-26 18:53:45,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:45,997 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312334679] [2023-08-26 18:53:45,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:45,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:46,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:46,128 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:46,128 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:53:46,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312334679] [2023-08-26 18:53:46,128 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [312334679] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:53:46,128 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:53:46,129 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:53:46,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904185150] [2023-08-26 18:53:46,129 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:53:46,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:53:46,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:53:46,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:53:46,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:53:46,131 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 148 out of 383 [2023-08-26 18:53:46,132 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 51 transitions, 110 flow. Second operand has 3 states, 3 states have (on average 148.66666666666666) internal successors, (446), 3 states have internal predecessors, (446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:46,132 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:53:46,132 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 148 of 383 [2023-08-26 18:53:46,132 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:53:46,258 INFO L124 PetriNetUnfolderBase]: 376/859 cut-off events. [2023-08-26 18:53:46,258 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:53:46,259 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1649 conditions, 859 events. 376/859 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 30. Compared 4051 event pairs, 322 based on Foata normal form. 0/726 useless extension candidates. Maximal degree in co-relation 1642. Up to 765 conditions per place. [2023-08-26 18:53:46,262 INFO L140 encePairwiseOnDemand]: 379/383 looper letters, 57 selfloop transitions, 2 changer transitions 1/67 dead transitions. [2023-08-26 18:53:46,262 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 56 places, 67 transitions, 262 flow [2023-08-26 18:53:46,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:53:46,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:53:46,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 506 transitions. [2023-08-26 18:53:46,264 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44038294168842473 [2023-08-26 18:53:46,264 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 506 transitions. [2023-08-26 18:53:46,264 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 506 transitions. [2023-08-26 18:53:46,265 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:53:46,265 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 506 transitions. [2023-08-26 18:53:46,266 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 168.66666666666666) internal successors, (506), 3 states have internal predecessors, (506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:46,268 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 18:53:46,269 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 18:53:46,269 INFO L175 Difference]: Start difference. First operand has 59 places, 51 transitions, 110 flow. Second operand 3 states and 506 transitions. [2023-08-26 18:53:46,269 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 56 places, 67 transitions, 262 flow [2023-08-26 18:53:46,270 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 67 transitions, 259 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:53:46,271 INFO L231 Difference]: Finished difference. Result has 55 places, 51 transitions, 117 flow [2023-08-26 18:53:46,271 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=107, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=51, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=49, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=117, PETRI_PLACES=55, PETRI_TRANSITIONS=51} [2023-08-26 18:53:46,272 INFO L281 CegarLoopForPetriNet]: 59 programPoint places, -4 predicate places. [2023-08-26 18:53:46,272 INFO L495 AbstractCegarLoop]: Abstraction has has 55 places, 51 transitions, 117 flow [2023-08-26 18:53:46,273 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 148.66666666666666) internal successors, (446), 3 states have internal predecessors, (446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:46,273 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:46,273 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 18:53:46,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 18:53:46,273 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:53:46,274 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:46,274 INFO L85 PathProgramCache]: Analyzing trace with hash 769804551, now seen corresponding path program 1 times [2023-08-26 18:53:46,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:46,274 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643909413] [2023-08-26 18:53:46,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:46,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:46,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:46,380 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:46,380 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:53:46,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643909413] [2023-08-26 18:53:46,382 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643909413] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:53:46,382 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421274737] [2023-08-26 18:53:46,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:46,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:53:46,383 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:53:46,389 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 18:53:46,393 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 18:53:46,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:46,483 INFO L262 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:53:46,487 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:53:46,532 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:53:46,580 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:46,580 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:53:46,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:46,631 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1421274737] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:53:46,631 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:53:46,631 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:53:46,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830503046] [2023-08-26 18:53:46,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:53:46,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:53:46,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:53:46,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:53:46,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:53:46,635 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 148 out of 383 [2023-08-26 18:53:46,637 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 55 places, 51 transitions, 117 flow. Second operand has 8 states, 8 states have (on average 149.875) internal successors, (1199), 8 states have internal predecessors, (1199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:46,637 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:53:46,637 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 148 of 383 [2023-08-26 18:53:46,637 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:53:46,722 INFO L124 PetriNetUnfolderBase]: 30/87 cut-off events. [2023-08-26 18:53:46,723 INFO L125 PetriNetUnfolderBase]: For 29/29 co-relation queries the response was YES. [2023-08-26 18:53:46,723 INFO L83 FinitePrefix]: Finished finitePrefix Result has 207 conditions, 87 events. 30/87 cut-off events. For 29/29 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 134 event pairs, 14 based on Foata normal form. 16/103 useless extension candidates. Maximal degree in co-relation 198. Up to 62 conditions per place. [2023-08-26 18:53:46,723 INFO L140 encePairwiseOnDemand]: 379/383 looper letters, 0 selfloop transitions, 0 changer transitions 38/38 dead transitions. [2023-08-26 18:53:46,723 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 38 transitions, 155 flow [2023-08-26 18:53:46,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:53:46,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:53:46,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 629 transitions. [2023-08-26 18:53:46,726 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4105744125326371 [2023-08-26 18:53:46,726 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 629 transitions. [2023-08-26 18:53:46,726 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 629 transitions. [2023-08-26 18:53:46,727 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:53:46,727 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 629 transitions. [2023-08-26 18:53:46,728 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 157.25) internal successors, (629), 4 states have internal predecessors, (629), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:46,731 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 18:53:46,732 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 18:53:46,732 INFO L175 Difference]: Start difference. First operand has 55 places, 51 transitions, 117 flow. Second operand 4 states and 629 transitions. [2023-08-26 18:53:46,732 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 38 transitions, 155 flow [2023-08-26 18:53:46,733 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 38 transitions, 149 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-26 18:53:46,734 INFO L231 Difference]: Finished difference. Result has 28 places, 0 transitions, 0 flow [2023-08-26 18:53:46,734 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=47, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=22, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=28, PETRI_TRANSITIONS=0} [2023-08-26 18:53:46,735 INFO L281 CegarLoopForPetriNet]: 59 programPoint places, -31 predicate places. [2023-08-26 18:53:46,735 INFO L495 AbstractCegarLoop]: Abstraction has has 28 places, 0 transitions, 0 flow [2023-08-26 18:53:46,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 149.875) internal successors, (1199), 8 states have internal predecessors, (1199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:46,738 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 8 remaining) [2023-08-26 18:53:46,739 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 8 remaining) [2023-08-26 18:53:46,739 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 8 remaining) [2023-08-26 18:53:46,740 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONASSERT (4 of 8 remaining) [2023-08-26 18:53:46,740 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 8 remaining) [2023-08-26 18:53:46,740 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3ASSERT_VIOLATIONASSERT (2 of 8 remaining) [2023-08-26 18:53:46,741 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 8 remaining) [2023-08-26 18:53:46,742 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5ASSERT_VIOLATIONASSERT (0 of 8 remaining) [2023-08-26 18:53:46,752 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 18:53:46,947 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 18:53:46,948 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-26 18:53:46,950 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:53:46,954 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 176 places, 206 transitions, 420 flow [2023-08-26 18:53:46,980 INFO L124 PetriNetUnfolderBase]: 53/313 cut-off events. [2023-08-26 18:53:46,980 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:53:46,981 INFO L83 FinitePrefix]: Finished finitePrefix Result has 319 conditions, 313 events. 53/313 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 1260 event pairs, 0 based on Foata normal form. 0/241 useless extension candidates. Maximal degree in co-relation 165. Up to 6 conditions per place. [2023-08-26 18:53:46,981 INFO L82 GeneralOperation]: Start removeDead. Operand has 176 places, 206 transitions, 420 flow [2023-08-26 18:53:46,983 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 172 places, 201 transitions, 407 flow [2023-08-26 18:53:46,983 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:53:46,984 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 172 places, 201 transitions, 407 flow [2023-08-26 18:53:46,984 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 172 places, 201 transitions, 407 flow [2023-08-26 18:53:46,984 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 172 places, 201 transitions, 407 flow [2023-08-26 18:53:47,008 INFO L124 PetriNetUnfolderBase]: 52/308 cut-off events. [2023-08-26 18:53:47,008 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:53:47,009 INFO L83 FinitePrefix]: Finished finitePrefix Result has 313 conditions, 308 events. 52/308 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 1240 event pairs, 0 based on Foata normal form. 0/236 useless extension candidates. Maximal degree in co-relation 165. Up to 6 conditions per place. [2023-08-26 18:53:47,014 INFO L119 LiptonReduction]: Number of co-enabled transitions 11978 [2023-08-26 18:53:50,519 INFO L134 LiptonReduction]: Checked pairs total: 28080 [2023-08-26 18:53:50,519 INFO L136 LiptonReduction]: Total number of compositions: 174 [2023-08-26 18:53:50,521 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:53:50,522 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;@1e2ee6e3, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:53:50,522 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:53:50,526 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:53:50,526 INFO L124 PetriNetUnfolderBase]: 4/31 cut-off events. [2023-08-26 18:53:50,526 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:53:50,526 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:50,526 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 18:53:50,527 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:53:50,527 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:50,527 INFO L85 PathProgramCache]: Analyzing trace with hash -1059423065, now seen corresponding path program 1 times [2023-08-26 18:53:50,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:50,527 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807829972] [2023-08-26 18:53:50,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:50,528 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:50,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:53:50,549 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:53:50,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:53:50,581 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:53:50,581 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:53:50,581 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:53:50,581 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 18:53:50,582 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:53:50,582 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:53:50,583 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:53:50,583 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 18:53:50,618 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 18:53:50,624 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 220 places, 261 transitions, 540 flow [2023-08-26 18:53:50,684 INFO L124 PetriNetUnfolderBase]: 88/502 cut-off events. [2023-08-26 18:53:50,684 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:53:50,689 INFO L83 FinitePrefix]: Finished finitePrefix Result has 516 conditions, 502 events. 88/502 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2281 event pairs, 0 based on Foata normal form. 0/384 useless extension candidates. Maximal degree in co-relation 315. Up to 9 conditions per place. [2023-08-26 18:53:50,689 INFO L82 GeneralOperation]: Start removeDead. Operand has 220 places, 261 transitions, 540 flow [2023-08-26 18:53:50,693 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 220 places, 261 transitions, 540 flow [2023-08-26 18:53:50,693 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:53:50,697 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 220 places, 261 transitions, 540 flow [2023-08-26 18:53:50,697 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 220 places, 261 transitions, 540 flow [2023-08-26 18:53:50,697 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 220 places, 261 transitions, 540 flow [2023-08-26 18:53:50,751 INFO L124 PetriNetUnfolderBase]: 88/502 cut-off events. [2023-08-26 18:53:50,751 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:53:50,756 INFO L83 FinitePrefix]: Finished finitePrefix Result has 516 conditions, 502 events. 88/502 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2281 event pairs, 0 based on Foata normal form. 0/384 useless extension candidates. Maximal degree in co-relation 315. Up to 9 conditions per place. [2023-08-26 18:53:50,775 INFO L119 LiptonReduction]: Number of co-enabled transitions 30740 [2023-08-26 18:53:54,246 INFO L134 LiptonReduction]: Checked pairs total: 91078 [2023-08-26 18:53:54,246 INFO L136 LiptonReduction]: Total number of compositions: 201 [2023-08-26 18:53:54,248 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:53:54,249 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;@1e2ee6e3, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:53:54,249 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-08-26 18:53:54,250 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:53:54,250 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:53:54,250 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:53:54,251 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:54,251 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:53:54,251 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:53:54,251 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:54,251 INFO L85 PathProgramCache]: Analyzing trace with hash 47913, now seen corresponding path program 1 times [2023-08-26 18:53:54,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:54,251 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [317848643] [2023-08-26 18:53:54,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:54,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:54,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:54,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:54,324 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:53:54,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [317848643] [2023-08-26 18:53:54,324 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [317848643] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:53:54,325 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:53:54,325 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:53:54,326 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187538095] [2023-08-26 18:53:54,326 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:53:54,326 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:53:54,326 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:53:54,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:53:54,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:53:54,327 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 189 out of 462 [2023-08-26 18:53:54,328 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 91 places, 125 transitions, 268 flow. Second operand has 3 states, 3 states have (on average 189.66666666666666) internal successors, (569), 3 states have internal predecessors, (569), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:54,328 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:53:54,329 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 189 of 462 [2023-08-26 18:53:54,329 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:53:56,323 INFO L124 PetriNetUnfolderBase]: 14989/25791 cut-off events. [2023-08-26 18:53:56,324 INFO L125 PetriNetUnfolderBase]: For 76/76 co-relation queries the response was YES. [2023-08-26 18:53:56,358 INFO L83 FinitePrefix]: Finished finitePrefix Result has 49181 conditions, 25791 events. 14989/25791 cut-off events. For 76/76 co-relation queries the response was YES. Maximal size of possible extension queue 531. Compared 197903 event pairs, 7050 based on Foata normal form. 6034/28381 useless extension candidates. Maximal degree in co-relation 2981. Up to 23252 conditions per place. [2023-08-26 18:53:56,470 INFO L140 encePairwiseOnDemand]: 422/462 looper letters, 80 selfloop transitions, 2 changer transitions 3/104 dead transitions. [2023-08-26 18:53:56,470 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 90 places, 104 transitions, 394 flow [2023-08-26 18:53:56,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:53:56,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:53:56,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 701 transitions. [2023-08-26 18:53:56,472 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5057720057720058 [2023-08-26 18:53:56,473 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 701 transitions. [2023-08-26 18:53:56,473 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 701 transitions. [2023-08-26 18:53:56,473 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:53:56,473 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 701 transitions. [2023-08-26 18:53:56,475 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 233.66666666666666) internal successors, (701), 3 states have internal predecessors, (701), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:56,477 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 462.0) internal successors, (1848), 4 states have internal predecessors, (1848), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:56,478 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 462.0) internal successors, (1848), 4 states have internal predecessors, (1848), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:56,478 INFO L175 Difference]: Start difference. First operand has 91 places, 125 transitions, 268 flow. Second operand 3 states and 701 transitions. [2023-08-26 18:53:56,478 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 90 places, 104 transitions, 394 flow [2023-08-26 18:53:56,483 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 90 places, 104 transitions, 394 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:53:56,485 INFO L231 Difference]: Finished difference. Result has 91 places, 84 transitions, 194 flow [2023-08-26 18:53:56,486 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=462, PETRI_DIFFERENCE_MINUEND_FLOW=190, PETRI_DIFFERENCE_MINUEND_PLACES=88, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=86, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=84, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=194, PETRI_PLACES=91, PETRI_TRANSITIONS=84} [2023-08-26 18:53:56,489 INFO L281 CegarLoopForPetriNet]: 91 programPoint places, 0 predicate places. [2023-08-26 18:53:56,489 INFO L495 AbstractCegarLoop]: Abstraction has has 91 places, 84 transitions, 194 flow [2023-08-26 18:53:56,490 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 189.66666666666666) internal successors, (569), 3 states have internal predecessors, (569), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:56,490 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:56,490 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:53:56,490 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 18:53:56,490 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:53:56,491 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:56,491 INFO L85 PathProgramCache]: Analyzing trace with hash 47914, now seen corresponding path program 1 times [2023-08-26 18:53:56,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:56,491 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007490790] [2023-08-26 18:53:56,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:56,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:56,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:56,524 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:56,524 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:53:56,524 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007490790] [2023-08-26 18:53:56,524 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2007490790] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:53:56,524 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:53:56,524 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:53:56,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189600955] [2023-08-26 18:53:56,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:53:56,525 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:53:56,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:53:56,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:53:56,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:53:56,526 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 194 out of 462 [2023-08-26 18:53:56,527 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 91 places, 84 transitions, 194 flow. Second operand has 3 states, 3 states have (on average 194.66666666666666) internal successors, (584), 3 states have internal predecessors, (584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:56,527 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:53:56,527 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 194 of 462 [2023-08-26 18:53:56,527 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:53:58,264 INFO L124 PetriNetUnfolderBase]: 12979/22277 cut-off events. [2023-08-26 18:53:58,266 INFO L125 PetriNetUnfolderBase]: For 622/622 co-relation queries the response was YES. [2023-08-26 18:53:58,310 INFO L83 FinitePrefix]: Finished finitePrefix Result has 43337 conditions, 22277 events. 12979/22277 cut-off events. For 622/622 co-relation queries the response was YES. Maximal size of possible extension queue 486. Compared 165717 event pairs, 12690 based on Foata normal form. 0/20096 useless extension candidates. Maximal degree in co-relation 43220. Up to 20137 conditions per place. [2023-08-26 18:53:58,392 INFO L140 encePairwiseOnDemand]: 459/462 looper letters, 62 selfloop transitions, 1 changer transitions 0/82 dead transitions. [2023-08-26 18:53:58,392 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 88 places, 82 transitions, 316 flow [2023-08-26 18:53:58,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:53:58,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:53:58,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 646 transitions. [2023-08-26 18:53:58,394 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4660894660894661 [2023-08-26 18:53:58,395 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 646 transitions. [2023-08-26 18:53:58,395 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 646 transitions. [2023-08-26 18:53:58,395 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:53:58,395 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 646 transitions. [2023-08-26 18:53:58,397 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 215.33333333333334) internal successors, (646), 3 states have internal predecessors, (646), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:58,399 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 462.0) internal successors, (1848), 4 states have internal predecessors, (1848), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:58,400 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 462.0) internal successors, (1848), 4 states have internal predecessors, (1848), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:58,400 INFO L175 Difference]: Start difference. First operand has 91 places, 84 transitions, 194 flow. Second operand 3 states and 646 transitions. [2023-08-26 18:53:58,400 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 88 places, 82 transitions, 316 flow [2023-08-26 18:53:58,407 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 86 places, 82 transitions, 312 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:53:58,409 INFO L231 Difference]: Finished difference. Result has 86 places, 82 transitions, 188 flow [2023-08-26 18:53:58,410 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=462, PETRI_DIFFERENCE_MINUEND_FLOW=186, PETRI_DIFFERENCE_MINUEND_PLACES=84, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=82, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=81, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=188, PETRI_PLACES=86, PETRI_TRANSITIONS=82} [2023-08-26 18:53:58,411 INFO L281 CegarLoopForPetriNet]: 91 programPoint places, -5 predicate places. [2023-08-26 18:53:58,411 INFO L495 AbstractCegarLoop]: Abstraction has has 86 places, 82 transitions, 188 flow [2023-08-26 18:53:58,411 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 194.66666666666666) internal successors, (584), 3 states have internal predecessors, (584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:58,412 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:53:58,412 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:53:58,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 18:53:58,416 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:53:58,417 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:53:58,417 INFO L85 PathProgramCache]: Analyzing trace with hash 1339540358, now seen corresponding path program 1 times [2023-08-26 18:53:58,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:53:58,418 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044397536] [2023-08-26 18:53:58,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:58,420 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:53:58,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:58,589 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:58,589 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:53:58,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044397536] [2023-08-26 18:53:58,589 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044397536] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:53:58,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488223677] [2023-08-26 18:53:58,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:53:58,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:53:58,591 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:53:58,592 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 18:53:58,618 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 18:53:58,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:53:58,660 INFO L262 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:53:58,661 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:53:58,669 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:53:58,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:58,711 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:53:58,748 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:53:58,748 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488223677] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:53:58,748 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:53:58,748 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:53:58,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525514791] [2023-08-26 18:53:58,748 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:53:58,749 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:53:58,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:53:58,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:53:58,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:53:58,751 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 189 out of 462 [2023-08-26 18:53:58,753 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 86 places, 82 transitions, 188 flow. Second operand has 8 states, 8 states have (on average 190.875) internal successors, (1527), 8 states have internal predecessors, (1527), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:58,753 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:53:58,753 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 189 of 462 [2023-08-26 18:53:58,753 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:53:59,026 INFO L124 PetriNetUnfolderBase]: 1230/2166 cut-off events. [2023-08-26 18:53:59,026 INFO L125 PetriNetUnfolderBase]: For 328/328 co-relation queries the response was YES. [2023-08-26 18:53:59,030 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4528 conditions, 2166 events. 1230/2166 cut-off events. For 328/328 co-relation queries the response was YES. Maximal size of possible extension queue 62. Compared 11585 event pairs, 238 based on Foata normal form. 272/2430 useless extension candidates. Maximal degree in co-relation 4518. Up to 1472 conditions per place. [2023-08-26 18:53:59,032 INFO L140 encePairwiseOnDemand]: 458/462 looper letters, 0 selfloop transitions, 0 changer transitions 98/98 dead transitions. [2023-08-26 18:53:59,032 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 62 places, 98 transitions, 377 flow [2023-08-26 18:53:59,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 18:53:59,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 18:53:59,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 1032 transitions. [2023-08-26 18:53:59,035 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44675324675324674 [2023-08-26 18:53:59,035 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 1032 transitions. [2023-08-26 18:53:59,035 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 1032 transitions. [2023-08-26 18:53:59,036 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:53:59,036 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 1032 transitions. [2023-08-26 18:53:59,038 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 206.4) internal successors, (1032), 5 states have internal predecessors, (1032), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:59,041 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 462.0) internal successors, (2772), 6 states have internal predecessors, (2772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:59,043 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 462.0) internal successors, (2772), 6 states have internal predecessors, (2772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:59,043 INFO L175 Difference]: Start difference. First operand has 86 places, 82 transitions, 188 flow. Second operand 5 states and 1032 transitions. [2023-08-26 18:53:59,043 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 62 places, 98 transitions, 377 flow [2023-08-26 18:53:59,044 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 98 transitions, 376 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:53:59,045 INFO L231 Difference]: Finished difference. Result has 61 places, 0 transitions, 0 flow [2023-08-26 18:53:59,048 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=462, PETRI_DIFFERENCE_MINUEND_FLOW=116, PETRI_DIFFERENCE_MINUEND_PLACES=57, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=51, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=51, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=61, PETRI_TRANSITIONS=0} [2023-08-26 18:53:59,049 INFO L281 CegarLoopForPetriNet]: 91 programPoint places, -30 predicate places. [2023-08-26 18:53:59,049 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 0 transitions, 0 flow [2023-08-26 18:53:59,050 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 190.875) internal successors, (1527), 8 states have internal predecessors, (1527), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:53:59,050 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 8 remaining) [2023-08-26 18:53:59,050 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 8 remaining) [2023-08-26 18:53:59,050 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 8 remaining) [2023-08-26 18:53:59,050 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONASSERT (4 of 8 remaining) [2023-08-26 18:53:59,050 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 8 remaining) [2023-08-26 18:53:59,051 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3ASSERT_VIOLATIONASSERT (2 of 8 remaining) [2023-08-26 18:53:59,051 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 8 remaining) [2023-08-26 18:53:59,051 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5ASSERT_VIOLATIONASSERT (0 of 8 remaining) [2023-08-26 18:53:59,056 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 18:53:59,255 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 18:53:59,256 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-26 18:53:59,256 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:53:59,258 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 220 places, 261 transitions, 540 flow [2023-08-26 18:53:59,300 INFO L124 PetriNetUnfolderBase]: 88/502 cut-off events. [2023-08-26 18:53:59,300 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:53:59,303 INFO L83 FinitePrefix]: Finished finitePrefix Result has 516 conditions, 502 events. 88/502 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2281 event pairs, 0 based on Foata normal form. 0/384 useless extension candidates. Maximal degree in co-relation 315. Up to 9 conditions per place. [2023-08-26 18:53:59,303 INFO L82 GeneralOperation]: Start removeDead. Operand has 220 places, 261 transitions, 540 flow [2023-08-26 18:53:59,306 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 220 places, 261 transitions, 540 flow [2023-08-26 18:53:59,306 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:53:59,306 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 220 places, 261 transitions, 540 flow [2023-08-26 18:53:59,306 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 220 places, 261 transitions, 540 flow [2023-08-26 18:53:59,306 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 220 places, 261 transitions, 540 flow [2023-08-26 18:53:59,342 INFO L124 PetriNetUnfolderBase]: 88/502 cut-off events. [2023-08-26 18:53:59,342 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:53:59,345 INFO L83 FinitePrefix]: Finished finitePrefix Result has 516 conditions, 502 events. 88/502 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2281 event pairs, 0 based on Foata normal form. 0/384 useless extension candidates. Maximal degree in co-relation 315. Up to 9 conditions per place. [2023-08-26 18:53:59,353 INFO L119 LiptonReduction]: Number of co-enabled transitions 30740 [2023-08-26 18:54:02,388 INFO L134 LiptonReduction]: Checked pairs total: 81796 [2023-08-26 18:54:02,388 INFO L136 LiptonReduction]: Total number of compositions: 199 [2023-08-26 18:54:02,390 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:54:02,390 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;@1e2ee6e3, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:54:02,390 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:54:02,398 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:54:02,398 INFO L124 PetriNetUnfolderBase]: 33/131 cut-off events. [2023-08-26 18:54:02,398 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 18:54:02,398 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:54:02,399 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 18:54:02,399 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:54:02,399 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:54:02,399 INFO L85 PathProgramCache]: Analyzing trace with hash 657023168, now seen corresponding path program 1 times [2023-08-26 18:54:02,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:54:02,399 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041565092] [2023-08-26 18:54:02,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:54:02,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:54:02,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:54:02,411 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:54:02,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:54:02,423 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:54:02,424 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:54:02,424 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:54:02,424 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 18:54:02,424 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:54:02,425 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:54:02,425 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:54:02,425 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 18:54:02,446 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 18:54:02,449 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 264 places, 316 transitions, 662 flow [2023-08-26 18:54:02,552 INFO L124 PetriNetUnfolderBase]: 128/728 cut-off events. [2023-08-26 18:54:02,552 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:54:02,561 INFO L83 FinitePrefix]: Finished finitePrefix Result has 756 conditions, 728 events. 128/728 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 20. Compared 3462 event pairs, 1 based on Foata normal form. 0/556 useless extension candidates. Maximal degree in co-relation 510. Up to 16 conditions per place. [2023-08-26 18:54:02,561 INFO L82 GeneralOperation]: Start removeDead. Operand has 264 places, 316 transitions, 662 flow [2023-08-26 18:54:02,567 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 264 places, 316 transitions, 662 flow [2023-08-26 18:54:02,567 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:54:02,567 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 264 places, 316 transitions, 662 flow [2023-08-26 18:54:02,568 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 264 places, 316 transitions, 662 flow [2023-08-26 18:54:02,568 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 264 places, 316 transitions, 662 flow [2023-08-26 18:54:02,640 INFO L124 PetriNetUnfolderBase]: 128/728 cut-off events. [2023-08-26 18:54:02,641 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:54:02,648 INFO L83 FinitePrefix]: Finished finitePrefix Result has 756 conditions, 728 events. 128/728 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 20. Compared 3462 event pairs, 1 based on Foata normal form. 0/556 useless extension candidates. Maximal degree in co-relation 510. Up to 16 conditions per place. [2023-08-26 18:54:02,671 INFO L119 LiptonReduction]: Number of co-enabled transitions 55014 [2023-08-26 18:54:06,046 INFO L134 LiptonReduction]: Checked pairs total: 181087 [2023-08-26 18:54:06,046 INFO L136 LiptonReduction]: Total number of compositions: 223 [2023-08-26 18:54:06,047 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:54:06,048 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;@1e2ee6e3, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:54:06,048 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-08-26 18:54:06,049 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:54:06,049 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:54:06,049 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:54:06,049 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:54:06,049 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:54:06,049 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:54:06,049 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:54:06,049 INFO L85 PathProgramCache]: Analyzing trace with hash 73289, now seen corresponding path program 1 times [2023-08-26 18:54:06,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:54:06,050 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301190027] [2023-08-26 18:54:06,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:54:06,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:54:06,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:54:06,072 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 18:54:06,072 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:54:06,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301190027] [2023-08-26 18:54:06,072 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301190027] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:54:06,072 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:54:06,073 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:54:06,073 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520642314] [2023-08-26 18:54:06,073 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:54:06,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:54:06,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:54:06,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:54:06,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:54:06,074 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 235 out of 539 [2023-08-26 18:54:06,075 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 120 places, 168 transitions, 366 flow. Second operand has 3 states, 3 states have (on average 235.66666666666666) internal successors, (707), 3 states have internal predecessors, (707), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:54:06,075 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:54:06,075 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 235 of 539 [2023-08-26 18:54:06,075 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:54:40,873 INFO L124 PetriNetUnfolderBase]: 368415/542102 cut-off events. [2023-08-26 18:54:40,873 INFO L125 PetriNetUnfolderBase]: For 2720/2720 co-relation queries the response was YES. [2023-08-26 18:54:41,813 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1045622 conditions, 542102 events. 368415/542102 cut-off events. For 2720/2720 co-relation queries the response was YES. Maximal size of possible extension queue 8434. Compared 4780631 event pairs, 346537 based on Foata normal form. 107744/592573 useless extension candidates. Maximal degree in co-relation 452168. Up to 483682 conditions per place. [2023-08-26 18:54:43,658 INFO L140 encePairwiseOnDemand]: 484/539 looper letters, 78 selfloop transitions, 1 changer transitions 49/155 dead transitions. [2023-08-26 18:54:43,658 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 115 places, 155 transitions, 594 flow [2023-08-26 18:54:43,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:54:43,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:54:43,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 921 transitions. [2023-08-26 18:54:43,661 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5695732838589982 [2023-08-26 18:54:43,661 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 921 transitions. [2023-08-26 18:54:43,661 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 921 transitions. [2023-08-26 18:54:43,662 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:54:43,662 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 921 transitions. [2023-08-26 18:54:43,664 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 307.0) internal successors, (921), 3 states have internal predecessors, (921), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:54:43,666 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 539.0) internal successors, (2156), 4 states have internal predecessors, (2156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:54:43,667 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 539.0) internal successors, (2156), 4 states have internal predecessors, (2156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:54:43,667 INFO L175 Difference]: Start difference. First operand has 120 places, 168 transitions, 366 flow. Second operand 3 states and 921 transitions. [2023-08-26 18:54:43,667 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 115 places, 155 transitions, 594 flow [2023-08-26 18:54:43,672 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 115 places, 155 transitions, 594 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:54:43,674 INFO L231 Difference]: Finished difference. Result has 115 places, 106 transitions, 238 flow [2023-08-26 18:54:43,674 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=539, PETRI_DIFFERENCE_MINUEND_FLOW=250, PETRI_DIFFERENCE_MINUEND_PLACES=113, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=110, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=109, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=238, PETRI_PLACES=115, PETRI_TRANSITIONS=106} [2023-08-26 18:54:43,675 INFO L281 CegarLoopForPetriNet]: 120 programPoint places, -5 predicate places. [2023-08-26 18:54:43,675 INFO L495 AbstractCegarLoop]: Abstraction has has 115 places, 106 transitions, 238 flow [2023-08-26 18:54:43,675 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 235.66666666666666) internal successors, (707), 3 states have internal predecessors, (707), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:54:43,675 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:54:43,675 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:54:43,675 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 18:54:43,675 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:54:43,676 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:54:43,676 INFO L85 PathProgramCache]: Analyzing trace with hash 73290, now seen corresponding path program 1 times [2023-08-26 18:54:43,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:54:43,676 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966418658] [2023-08-26 18:54:43,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:54:43,676 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:54:43,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:54:43,712 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 18:54:43,712 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:54:43,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966418658] [2023-08-26 18:54:43,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1966418658] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:54:43,712 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:54:43,712 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:54:43,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656648029] [2023-08-26 18:54:43,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:54:43,713 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:54:43,713 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:54:43,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:54:43,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:54:43,714 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 230 out of 539 [2023-08-26 18:54:43,715 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 115 places, 106 transitions, 238 flow. Second operand has 3 states, 3 states have (on average 230.66666666666666) internal successors, (692), 3 states have internal predecessors, (692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:54:43,715 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:54:43,715 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 230 of 539 [2023-08-26 18:54:43,715 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:16,094 INFO L124 PetriNetUnfolderBase]: 331587/486518 cut-off events. [2023-08-26 18:55:16,096 INFO L125 PetriNetUnfolderBase]: For 2611/2611 co-relation queries the response was YES. [2023-08-26 18:55:17,704 INFO L83 FinitePrefix]: Finished finitePrefix Result has 939515 conditions, 486518 events. 331587/486518 cut-off events. For 2611/2611 co-relation queries the response was YES. Maximal size of possible extension queue 7628. Compared 4220036 event pairs, 315266 based on Foata normal form. 0/444141 useless extension candidates. Maximal degree in co-relation 939506. Up to 451097 conditions per place. [2023-08-26 18:55:19,570 INFO L140 encePairwiseOnDemand]: 535/539 looper letters, 94 selfloop transitions, 2 changer transitions 0/123 dead transitions. [2023-08-26 18:55:19,570 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 113 places, 123 transitions, 464 flow [2023-08-26 18:55:19,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:55:19,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:55:19,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 788 transitions. [2023-08-26 18:55:19,572 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4873222016079159 [2023-08-26 18:55:19,572 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 788 transitions. [2023-08-26 18:55:19,572 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 788 transitions. [2023-08-26 18:55:19,573 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:19,573 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 788 transitions. [2023-08-26 18:55:19,574 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 262.6666666666667) internal successors, (788), 3 states have internal predecessors, (788), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:19,577 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 539.0) internal successors, (2156), 4 states have internal predecessors, (2156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:19,577 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 539.0) internal successors, (2156), 4 states have internal predecessors, (2156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:19,577 INFO L175 Difference]: Start difference. First operand has 115 places, 106 transitions, 238 flow. Second operand 3 states and 788 transitions. [2023-08-26 18:55:19,577 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 113 places, 123 transitions, 464 flow [2023-08-26 18:55:19,687 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 111 places, 123 transitions, 461 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:55:19,689 INFO L231 Difference]: Finished difference. Result has 112 places, 107 transitions, 249 flow [2023-08-26 18:55:19,689 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=539, PETRI_DIFFERENCE_MINUEND_FLOW=235, PETRI_DIFFERENCE_MINUEND_PLACES=109, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=106, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=104, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=249, PETRI_PLACES=112, PETRI_TRANSITIONS=107} [2023-08-26 18:55:19,689 INFO L281 CegarLoopForPetriNet]: 120 programPoint places, -8 predicate places. [2023-08-26 18:55:19,690 INFO L495 AbstractCegarLoop]: Abstraction has has 112 places, 107 transitions, 249 flow [2023-08-26 18:55:19,690 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 230.66666666666666) internal successors, (692), 3 states have internal predecessors, (692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:19,690 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:19,690 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:55:19,690 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 18:55:19,690 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:55:19,691 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:19,691 INFO L85 PathProgramCache]: Analyzing trace with hash -974142322, now seen corresponding path program 1 times [2023-08-26 18:55:19,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:19,691 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87415866] [2023-08-26 18:55:19,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:19,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:19,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:19,761 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 18:55:19,761 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:19,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87415866] [2023-08-26 18:55:19,762 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [87415866] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:55:19,762 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760618209] [2023-08-26 18:55:19,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:19,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:55:19,762 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:55:19,768 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 18:55:19,772 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 18:55:19,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:19,834 INFO L262 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:55:19,835 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:55:19,843 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 18:55:19,882 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 18:55:19,882 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:55:19,921 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 18:55:19,922 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760618209] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:55:19,922 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:55:19,922 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:55:19,922 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124202389] [2023-08-26 18:55:19,922 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:55:19,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:55:19,923 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:19,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:55:19,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:55:19,924 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 230 out of 539 [2023-08-26 18:55:19,926 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 112 places, 107 transitions, 249 flow. Second operand has 8 states, 8 states have (on average 231.875) internal successors, (1855), 8 states have internal predecessors, (1855), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:19,926 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:19,926 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 230 of 539 [2023-08-26 18:55:19,926 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:44,802 INFO L124 PetriNetUnfolderBase]: 303211/433717 cut-off events. [2023-08-26 18:55:44,802 INFO L125 PetriNetUnfolderBase]: For 6338/6338 co-relation queries the response was YES. [2023-08-26 18:55:45,647 INFO L83 FinitePrefix]: Finished finitePrefix Result has 857839 conditions, 433717 events. 303211/433717 cut-off events. For 6338/6338 co-relation queries the response was YES. Maximal size of possible extension queue 6574. Compared 3680144 event pairs, 3474 based on Foata normal form. 16/407172 useless extension candidates. Maximal degree in co-relation 857828. Up to 369064 conditions per place. [2023-08-26 18:55:46,921 INFO L140 encePairwiseOnDemand]: 535/539 looper letters, 211 selfloop transitions, 6 changer transitions 1/245 dead transitions. [2023-08-26 18:55:46,922 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 116 places, 245 transitions, 963 flow [2023-08-26 18:55:46,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:55:46,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:55:46,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1602 transitions. [2023-08-26 18:55:46,925 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.49536178107606677 [2023-08-26 18:55:46,925 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1602 transitions. [2023-08-26 18:55:46,925 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1602 transitions. [2023-08-26 18:55:46,926 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:46,926 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1602 transitions. [2023-08-26 18:55:46,928 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 267.0) internal successors, (1602), 6 states have internal predecessors, (1602), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:46,932 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 539.0) internal successors, (3773), 7 states have internal predecessors, (3773), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:46,933 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 539.0) internal successors, (3773), 7 states have internal predecessors, (3773), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:46,933 INFO L175 Difference]: Start difference. First operand has 112 places, 107 transitions, 249 flow. Second operand 6 states and 1602 transitions. [2023-08-26 18:55:46,933 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 116 places, 245 transitions, 963 flow [2023-08-26 18:55:46,950 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 115 places, 245 transitions, 961 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:55:46,952 INFO L231 Difference]: Finished difference. Result has 115 places, 108 transitions, 263 flow [2023-08-26 18:55:46,952 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=539, PETRI_DIFFERENCE_MINUEND_FLOW=243, PETRI_DIFFERENCE_MINUEND_PLACES=110, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=106, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=102, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=263, PETRI_PLACES=115, PETRI_TRANSITIONS=108} [2023-08-26 18:55:46,953 INFO L281 CegarLoopForPetriNet]: 120 programPoint places, -5 predicate places. [2023-08-26 18:55:46,953 INFO L495 AbstractCegarLoop]: Abstraction has has 115 places, 108 transitions, 263 flow [2023-08-26 18:55:46,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 231.875) internal successors, (1855), 8 states have internal predecessors, (1855), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:46,953 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:46,953 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 18:55:46,958 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-08-26 18:55:47,154 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 18:55:47,154 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:55:47,154 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:47,155 INFO L85 PathProgramCache]: Analyzing trace with hash 2110316008, now seen corresponding path program 1 times [2023-08-26 18:55:47,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:47,155 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1861177893] [2023-08-26 18:55:47,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:47,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:47,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:47,240 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 18:55:47,240 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:47,240 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1861177893] [2023-08-26 18:55:47,240 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1861177893] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:55:47,240 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:55:47,240 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:55:47,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444423072] [2023-08-26 18:55:47,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:55:47,241 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:55:47,241 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:47,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:55:47,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:55:47,242 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 235 out of 539 [2023-08-26 18:55:47,243 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 115 places, 108 transitions, 263 flow. Second operand has 3 states, 3 states have (on average 237.66666666666666) internal successors, (713), 3 states have internal predecessors, (713), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:47,243 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:47,243 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 235 of 539 [2023-08-26 18:55:47,243 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:56:26,191 INFO L124 PetriNetUnfolderBase]: 429594/621269 cut-off events. [2023-08-26 18:56:26,191 INFO L125 PetriNetUnfolderBase]: For 37491/37491 co-relation queries the response was YES. [2023-08-26 18:56:27,524 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1229221 conditions, 621269 events. 429594/621269 cut-off events. For 37491/37491 co-relation queries the response was YES. Maximal size of possible extension queue 9121. Compared 5325400 event pairs, 218556 based on Foata normal form. 0/577400 useless extension candidates. Maximal degree in co-relation 1229209. Up to 578772 conditions per place. [2023-08-26 18:56:29,601 INFO L140 encePairwiseOnDemand]: 532/539 looper letters, 120 selfloop transitions, 4 changer transitions 0/146 dead transitions. [2023-08-26 18:56:29,601 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 117 places, 146 transitions, 618 flow [2023-08-26 18:56:29,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:56:29,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:56:29,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 826 transitions. [2023-08-26 18:56:29,606 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5108225108225108 [2023-08-26 18:56:29,606 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 826 transitions. [2023-08-26 18:56:29,606 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 826 transitions. [2023-08-26 18:56:29,607 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:56:29,607 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 826 transitions. [2023-08-26 18:56:29,609 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 275.3333333333333) internal successors, (826), 3 states have internal predecessors, (826), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:29,613 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 539.0) internal successors, (2156), 4 states have internal predecessors, (2156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:29,613 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 539.0) internal successors, (2156), 4 states have internal predecessors, (2156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:29,614 INFO L175 Difference]: Start difference. First operand has 115 places, 108 transitions, 263 flow. Second operand 3 states and 826 transitions. [2023-08-26 18:56:29,614 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 117 places, 146 transitions, 618 flow [2023-08-26 18:56:29,652 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 114 places, 146 transitions, 591 flow, removed 8 selfloop flow, removed 3 redundant places. [2023-08-26 18:56:29,654 INFO L231 Difference]: Finished difference. Result has 115 places, 111 transitions, 278 flow [2023-08-26 18:56:29,655 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=539, PETRI_DIFFERENCE_MINUEND_FLOW=248, PETRI_DIFFERENCE_MINUEND_PLACES=112, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=108, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=104, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=278, PETRI_PLACES=115, PETRI_TRANSITIONS=111} [2023-08-26 18:56:29,656 INFO L281 CegarLoopForPetriNet]: 120 programPoint places, -5 predicate places. [2023-08-26 18:56:29,656 INFO L495 AbstractCegarLoop]: Abstraction has has 115 places, 111 transitions, 278 flow [2023-08-26 18:56:29,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 237.66666666666666) internal successors, (713), 3 states have internal predecessors, (713), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:29,657 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:56:29,657 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:56:29,657 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 18:56:29,657 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:56:29,662 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:56:29,662 INFO L85 PathProgramCache]: Analyzing trace with hash -189746414, now seen corresponding path program 1 times [2023-08-26 18:56:29,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:56:29,662 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193614317] [2023-08-26 18:56:29,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:56:29,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:56:29,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:56:29,719 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 18:56:29,719 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:56:29,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193614317] [2023-08-26 18:56:29,720 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193614317] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:56:29,720 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960748526] [2023-08-26 18:56:29,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:56:29,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:56:29,720 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:56:29,721 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 18:56:29,727 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 18:56:29,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:56:29,803 INFO L262 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:56:29,804 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:56:29,825 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 18:56:29,825 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:56:29,855 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 18:56:29,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1960748526] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:56:29,855 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:56:29,855 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-08-26 18:56:29,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326339655] [2023-08-26 18:56:29,856 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:56:29,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-08-26 18:56:29,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:56:29,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-08-26 18:56:29,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2023-08-26 18:56:29,858 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 242 out of 539 [2023-08-26 18:56:29,860 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 115 places, 111 transitions, 278 flow. Second operand has 9 states, 9 states have (on average 245.0) internal successors, (2205), 9 states have internal predecessors, (2205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:29,860 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:56:29,860 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 242 of 539 [2023-08-26 18:56:29,860 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:56:32,853 INFO L124 PetriNetUnfolderBase]: 33686/49535 cut-off events. [2023-08-26 18:56:32,853 INFO L125 PetriNetUnfolderBase]: For 7931/7931 co-relation queries the response was YES. [2023-08-26 18:56:32,942 INFO L83 FinitePrefix]: Finished finitePrefix Result has 104210 conditions, 49535 events. 33686/49535 cut-off events. For 7931/7931 co-relation queries the response was YES. Maximal size of possible extension queue 923. Compared 343947 event pairs, 3859 based on Foata normal form. 4596/54011 useless extension candidates. Maximal degree in co-relation 104198. Up to 33085 conditions per place. [2023-08-26 18:56:32,966 INFO L140 encePairwiseOnDemand]: 536/539 looper letters, 0 selfloop transitions, 0 changer transitions 173/173 dead transitions. [2023-08-26 18:56:32,966 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 92 places, 173 transitions, 704 flow [2023-08-26 18:56:32,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:56:32,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:56:32,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1599 transitions. [2023-08-26 18:56:32,970 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.49443413729128016 [2023-08-26 18:56:32,970 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1599 transitions. [2023-08-26 18:56:32,970 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1599 transitions. [2023-08-26 18:56:32,971 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:56:32,971 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1599 transitions. [2023-08-26 18:56:32,973 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 266.5) internal successors, (1599), 6 states have internal predecessors, (1599), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:32,977 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 539.0) internal successors, (3773), 7 states have internal predecessors, (3773), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:32,978 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 539.0) internal successors, (3773), 7 states have internal predecessors, (3773), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:32,978 INFO L175 Difference]: Start difference. First operand has 115 places, 111 transitions, 278 flow. Second operand 6 states and 1599 transitions. [2023-08-26 18:56:32,978 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 92 places, 173 transitions, 704 flow [2023-08-26 18:56:32,980 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 91 places, 173 transitions, 694 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-26 18:56:32,981 INFO L231 Difference]: Finished difference. Result has 91 places, 0 transitions, 0 flow [2023-08-26 18:56:32,981 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=539, PETRI_DIFFERENCE_MINUEND_FLOW=190, PETRI_DIFFERENCE_MINUEND_PLACES=86, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=78, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=78, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=91, PETRI_TRANSITIONS=0} [2023-08-26 18:56:32,981 INFO L281 CegarLoopForPetriNet]: 120 programPoint places, -29 predicate places. [2023-08-26 18:56:32,981 INFO L495 AbstractCegarLoop]: Abstraction has has 91 places, 0 transitions, 0 flow [2023-08-26 18:56:32,982 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 245.0) internal successors, (2205), 9 states have internal predecessors, (2205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:32,982 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 8 remaining) [2023-08-26 18:56:32,982 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 8 remaining) [2023-08-26 18:56:32,983 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 8 remaining) [2023-08-26 18:56:32,983 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONASSERT (4 of 8 remaining) [2023-08-26 18:56:32,983 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 8 remaining) [2023-08-26 18:56:32,983 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3ASSERT_VIOLATIONASSERT (2 of 8 remaining) [2023-08-26 18:56:32,983 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 8 remaining) [2023-08-26 18:56:32,983 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5ASSERT_VIOLATIONASSERT (0 of 8 remaining) [2023-08-26 18:56:32,989 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 18:56:33,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:56:33,188 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2023-08-26 18:56:33,189 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:56:33,191 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 264 places, 316 transitions, 662 flow [2023-08-26 18:56:33,253 INFO L124 PetriNetUnfolderBase]: 128/728 cut-off events. [2023-08-26 18:56:33,253 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:56:33,261 INFO L83 FinitePrefix]: Finished finitePrefix Result has 756 conditions, 728 events. 128/728 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 20. Compared 3462 event pairs, 1 based on Foata normal form. 0/556 useless extension candidates. Maximal degree in co-relation 510. Up to 16 conditions per place. [2023-08-26 18:56:33,261 INFO L82 GeneralOperation]: Start removeDead. Operand has 264 places, 316 transitions, 662 flow [2023-08-26 18:56:33,265 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 264 places, 316 transitions, 662 flow [2023-08-26 18:56:33,265 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:56:33,265 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 264 places, 316 transitions, 662 flow [2023-08-26 18:56:33,265 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 264 places, 316 transitions, 662 flow [2023-08-26 18:56:33,265 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 264 places, 316 transitions, 662 flow [2023-08-26 18:56:33,326 INFO L124 PetriNetUnfolderBase]: 128/728 cut-off events. [2023-08-26 18:56:33,327 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:56:33,334 INFO L83 FinitePrefix]: Finished finitePrefix Result has 756 conditions, 728 events. 128/728 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 20. Compared 3462 event pairs, 1 based on Foata normal form. 0/556 useless extension candidates. Maximal degree in co-relation 510. Up to 16 conditions per place. [2023-08-26 18:56:33,354 INFO L119 LiptonReduction]: Number of co-enabled transitions 55014 [2023-08-26 18:56:36,900 INFO L134 LiptonReduction]: Checked pairs total: 175762 [2023-08-26 18:56:36,900 INFO L136 LiptonReduction]: Total number of compositions: 222 [2023-08-26 18:56:36,901 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:56:36,902 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;@1e2ee6e3, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:56:36,902 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:56:36,910 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:56:36,929 INFO L124 PetriNetUnfolderBase]: 62/225 cut-off events. [2023-08-26 18:56:36,929 INFO L125 PetriNetUnfolderBase]: For 8/8 co-relation queries the response was YES. [2023-08-26 18:56:36,929 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:56:36,929 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 18:56:36,929 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:56:36,929 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:56:36,929 INFO L85 PathProgramCache]: Analyzing trace with hash -267698853, now seen corresponding path program 1 times [2023-08-26 18:56:36,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:56:36,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581943178] [2023-08-26 18:56:36,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:56:36,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:56:36,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:56:36,947 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:56:36,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:56:36,959 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:56:36,959 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:56:36,959 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:56:36,959 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-26 18:56:36,959 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:56:36,960 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:56:36,960 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:56:36,960 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 18:56:36,983 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 18:56:36,986 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 308 places, 371 transitions, 786 flow [2023-08-26 18:56:37,105 INFO L124 PetriNetUnfolderBase]: 180/1030 cut-off events. [2023-08-26 18:56:37,106 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:56:37,123 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1085 conditions, 1030 events. 180/1030 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 5179 event pairs, 6 based on Foata normal form. 0/788 useless extension candidates. Maximal degree in co-relation 748. Up to 32 conditions per place. [2023-08-26 18:56:37,124 INFO L82 GeneralOperation]: Start removeDead. Operand has 308 places, 371 transitions, 786 flow [2023-08-26 18:56:37,132 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 308 places, 371 transitions, 786 flow [2023-08-26 18:56:37,132 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:56:37,132 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 308 places, 371 transitions, 786 flow [2023-08-26 18:56:37,132 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 308 places, 371 transitions, 786 flow [2023-08-26 18:56:37,132 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 308 places, 371 transitions, 786 flow [2023-08-26 18:56:37,248 INFO L124 PetriNetUnfolderBase]: 180/1030 cut-off events. [2023-08-26 18:56:37,248 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:56:37,264 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1085 conditions, 1030 events. 180/1030 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 5179 event pairs, 6 based on Foata normal form. 0/788 useless extension candidates. Maximal degree in co-relation 748. Up to 32 conditions per place. [2023-08-26 18:56:37,290 INFO L119 LiptonReduction]: Number of co-enabled transitions 85224 [2023-08-26 18:56:40,646 INFO L134 LiptonReduction]: Checked pairs total: 282423 [2023-08-26 18:56:40,647 INFO L136 LiptonReduction]: Total number of compositions: 248 [2023-08-26 18:56:40,648 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:56:40,648 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;@1e2ee6e3, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:56:40,648 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-08-26 18:56:40,649 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:56:40,649 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:56:40,649 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:56:40,649 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:56:40,649 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:56:40,649 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:56:40,649 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:56:40,649 INFO L85 PathProgramCache]: Analyzing trace with hash 101976, now seen corresponding path program 1 times [2023-08-26 18:56:40,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:56:40,649 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541744545] [2023-08-26 18:56:40,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:56:40,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:56:40,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:56:40,683 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 18:56:40,683 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:56:40,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1541744545] [2023-08-26 18:56:40,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1541744545] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:56:40,683 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:56:40,683 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:56:40,684 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678745872] [2023-08-26 18:56:40,684 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:56:40,684 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:56:40,684 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:56:40,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:56:40,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:56:40,685 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 276 out of 619 [2023-08-26 18:56:40,697 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 143 places, 200 transitions, 444 flow. Second operand has 3 states, 3 states have (on average 276.6666666666667) internal successors, (830), 3 states have internal predecessors, (830), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:40,698 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:56:40,698 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 276 of 619 [2023-08-26 18:56:40,698 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand