/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_60-invariant_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 18:55:12,767 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 18:55:12,833 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 18:55:12,836 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 18:55:12,837 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 18:55:12,861 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 18:55:12,861 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 18:55:12,865 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 18:55:12,865 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 18:55:12,868 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 18:55:12,868 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 18:55:12,868 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 18:55:12,868 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 18:55:12,869 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 18:55:12,869 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 18:55:12,870 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 18:55:12,870 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 18:55:12,870 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 18:55:12,870 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 18:55:12,870 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 18:55:12,870 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 18:55:12,871 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 18:55:12,871 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 18:55:12,871 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 18:55:12,871 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 18:55:12,872 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 18:55:12,872 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 18:55:12,872 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:55:12,872 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 18:55:12,872 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 18:55:12,873 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 18:55:12,873 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 18:55:12,873 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 18:55:12,873 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 18:55:12,873 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 18:55:12,873 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 18:55:13,111 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 18:55:13,123 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 18:55:13,125 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 18:55:13,125 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 18:55:13,126 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 18:55:13,127 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_60-invariant_racefree.i [2023-08-26 18:55:13,975 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 18:55:14,187 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 18:55:14,187 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_60-invariant_racefree.i [2023-08-26 18:55:14,207 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4d75cccf5/a9f9a9b0d17e4d58b95fd4b9ff7fa32e/FLAG00e292f57 [2023-08-26 18:55:14,217 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4d75cccf5/a9f9a9b0d17e4d58b95fd4b9ff7fa32e [2023-08-26 18:55:14,219 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 18:55:14,220 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 18:55:14,220 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 18:55:14,220 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 18:55:14,222 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 18:55:14,223 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,223 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51e4880a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14, skipping insertion in model container [2023-08-26 18:55:14,223 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,249 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 18:55:14,477 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:55:14,492 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 18:55:14,516 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 18:55:14,518 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 18:55:14,538 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:55:14,569 INFO L206 MainTranslator]: Completed translation [2023-08-26 18:55:14,569 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14 WrapperNode [2023-08-26 18:55:14,569 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 18:55:14,570 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 18:55:14,570 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 18:55:14,571 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 18:55:14,575 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,599 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,623 INFO L138 Inliner]: procedures = 170, calls = 35, calls flagged for inlining = 5, calls inlined = 6, statements flattened = 149 [2023-08-26 18:55:14,624 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 18:55:14,625 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 18:55:14,625 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 18:55:14,625 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 18:55:14,631 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,631 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,642 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,643 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,649 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,652 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,653 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,654 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,655 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 18:55:14,656 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 18:55:14,656 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 18:55:14,656 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 18:55:14,663 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14" (1/1) ... [2023-08-26 18:55:14,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:55:14,673 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:55:14,682 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 18:55:14,688 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 18:55:14,713 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 18:55:14,713 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 18:55:14,713 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 18:55:14,713 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 18:55:14,714 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 18:55:14,714 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 18:55:14,714 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 18:55:14,714 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 18:55:14,714 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 18:55:14,714 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 18:55:14,714 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 18:55:14,715 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 18:55:14,823 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 18:55:14,825 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 18:55:15,011 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 18:55:15,016 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 18:55:15,016 INFO L302 CfgBuilder]: Removed 18 assume(true) statements. [2023-08-26 18:55:15,018 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:55:15 BoogieIcfgContainer [2023-08-26 18:55:15,018 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 18:55:15,019 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 18:55:15,019 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 18:55:15,024 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 18:55:15,024 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 06:55:14" (1/3) ... [2023-08-26 18:55:15,024 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7856236f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:55:15, skipping insertion in model container [2023-08-26 18:55:15,024 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:55:14" (2/3) ... [2023-08-26 18:55:15,025 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7856236f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:55:15, skipping insertion in model container [2023-08-26 18:55:15,025 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:55:15" (3/3) ... [2023-08-26 18:55:15,025 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_60-invariant_racefree.i [2023-08-26 18:55:15,036 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 18:55:15,041 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2023-08-26 18:55:15,042 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 18:55:15,122 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 18:55:15,151 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 152 transitions, 312 flow [2023-08-26 18:55:15,220 INFO L124 PetriNetUnfolderBase]: 36/217 cut-off events. [2023-08-26 18:55:15,221 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:55:15,227 INFO L83 FinitePrefix]: Finished finitePrefix Result has 223 conditions, 217 events. 36/217 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 765 event pairs, 0 based on Foata normal form. 0/167 useless extension candidates. Maximal degree in co-relation 119. Up to 6 conditions per place. [2023-08-26 18:55:15,227 INFO L82 GeneralOperation]: Start removeDead. Operand has 131 places, 152 transitions, 312 flow [2023-08-26 18:55:15,234 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 131 places, 152 transitions, 312 flow [2023-08-26 18:55:15,237 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:55:15,249 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 131 places, 152 transitions, 312 flow [2023-08-26 18:55:15,253 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 131 places, 152 transitions, 312 flow [2023-08-26 18:55:15,253 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 152 transitions, 312 flow [2023-08-26 18:55:15,273 INFO L124 PetriNetUnfolderBase]: 36/217 cut-off events. [2023-08-26 18:55:15,273 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:55:15,274 INFO L83 FinitePrefix]: Finished finitePrefix Result has 223 conditions, 217 events. 36/217 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 765 event pairs, 0 based on Foata normal form. 0/167 useless extension candidates. Maximal degree in co-relation 119. Up to 6 conditions per place. [2023-08-26 18:55:15,276 INFO L119 LiptonReduction]: Number of co-enabled transitions 6958 [2023-08-26 18:55:17,398 INFO L134 LiptonReduction]: Checked pairs total: 17430 [2023-08-26 18:55:17,398 INFO L136 LiptonReduction]: Total number of compositions: 119 [2023-08-26 18:55:17,407 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:55:17,410 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;@46136f12, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:55:17,411 INFO L358 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2023-08-26 18:55:17,412 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:55:17,412 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:55:17,412 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:55:17,413 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:17,413 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:55:17,413 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-26 18:55:17,416 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:17,416 INFO L85 PathProgramCache]: Analyzing trace with hash 19167, now seen corresponding path program 1 times [2023-08-26 18:55:17,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:17,422 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243396297] [2023-08-26 18:55:17,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:17,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:17,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:17,551 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 18:55:17,551 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:17,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243396297] [2023-08-26 18:55:17,552 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243396297] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:55:17,552 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:55:17,552 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:55:17,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407606509] [2023-08-26 18:55:17,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:55:17,558 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:55:17,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:17,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:55:17,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:55:17,574 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 111 out of 271 [2023-08-26 18:55:17,576 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 51 places, 68 transitions, 144 flow. Second operand has 3 states, 3 states have (on average 111.66666666666667) internal successors, (335), 3 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:17,576 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:17,576 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 111 of 271 [2023-08-26 18:55:17,577 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:17,712 INFO L124 PetriNetUnfolderBase]: 258/642 cut-off events. [2023-08-26 18:55:17,712 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:55:17,714 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1197 conditions, 642 events. 258/642 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 31. Compared 3281 event pairs, 225 based on Foata normal form. 117/599 useless extension candidates. Maximal degree in co-relation 1142. Up to 514 conditions per place. [2023-08-26 18:55:17,718 INFO L140 encePairwiseOnDemand]: 249/271 looper letters, 38 selfloop transitions, 2 changer transitions 12/64 dead transitions. [2023-08-26 18:55:17,718 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 51 places, 64 transitions, 240 flow [2023-08-26 18:55:17,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:55:17,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:55:17,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 414 transitions. [2023-08-26 18:55:17,732 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5092250922509225 [2023-08-26 18:55:17,732 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 414 transitions. [2023-08-26 18:55:17,732 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 414 transitions. [2023-08-26 18:55:17,735 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:17,737 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 414 transitions. [2023-08-26 18:55:17,739 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 138.0) internal successors, (414), 3 states have internal predecessors, (414), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:17,745 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 271.0) internal successors, (1084), 4 states have internal predecessors, (1084), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:17,746 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 271.0) internal successors, (1084), 4 states have internal predecessors, (1084), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:17,747 INFO L175 Difference]: Start difference. First operand has 51 places, 68 transitions, 144 flow. Second operand 3 states and 414 transitions. [2023-08-26 18:55:17,747 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 51 places, 64 transitions, 240 flow [2023-08-26 18:55:17,749 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 51 places, 64 transitions, 240 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:55:17,751 INFO L231 Difference]: Finished difference. Result has 51 places, 48 transitions, 108 flow [2023-08-26 18:55:17,752 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=271, PETRI_DIFFERENCE_MINUEND_FLOW=104, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=48, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=46, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=108, PETRI_PLACES=51, PETRI_TRANSITIONS=48} [2023-08-26 18:55:17,755 INFO L281 CegarLoopForPetriNet]: 51 programPoint places, 0 predicate places. [2023-08-26 18:55:17,755 INFO L495 AbstractCegarLoop]: Abstraction has has 51 places, 48 transitions, 108 flow [2023-08-26 18:55:17,755 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 111.66666666666667) internal successors, (335), 3 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:17,755 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:17,755 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:55:17,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 18:55:17,756 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-26 18:55:17,757 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:17,757 INFO L85 PathProgramCache]: Analyzing trace with hash 19168, now seen corresponding path program 1 times [2023-08-26 18:55:17,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:17,757 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636881519] [2023-08-26 18:55:17,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:17,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:17,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:17,853 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 18:55:17,853 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:17,854 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636881519] [2023-08-26 18:55:17,854 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1636881519] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:55:17,854 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:55:17,854 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:55:17,854 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231505931] [2023-08-26 18:55:17,854 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:55:17,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:55:17,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:17,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:55:17,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:55:17,856 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 106 out of 271 [2023-08-26 18:55:17,856 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 51 places, 48 transitions, 108 flow. Second operand has 3 states, 3 states have (on average 106.66666666666667) internal successors, (320), 3 states have internal predecessors, (320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:17,856 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:17,856 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 106 of 271 [2023-08-26 18:55:17,857 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:17,968 INFO L124 PetriNetUnfolderBase]: 257/668 cut-off events. [2023-08-26 18:55:17,968 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:55:17,968 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1245 conditions, 668 events. 257/668 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 30. Compared 3529 event pairs, 0 based on Foata normal form. 0/533 useless extension candidates. Maximal degree in co-relation 1188. Up to 518 conditions per place. [2023-08-26 18:55:17,970 INFO L140 encePairwiseOnDemand]: 267/271 looper letters, 51 selfloop transitions, 2 changer transitions 0/65 dead transitions. [2023-08-26 18:55:17,970 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 53 places, 65 transitions, 248 flow [2023-08-26 18:55:17,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:55:17,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:55:17,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 373 transitions. [2023-08-26 18:55:17,971 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45879458794587946 [2023-08-26 18:55:17,971 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 373 transitions. [2023-08-26 18:55:17,972 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 373 transitions. [2023-08-26 18:55:17,972 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:17,972 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 373 transitions. [2023-08-26 18:55:17,973 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 124.33333333333333) internal successors, (373), 3 states have internal predecessors, (373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:17,974 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 271.0) internal successors, (1084), 4 states have internal predecessors, (1084), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:17,974 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 271.0) internal successors, (1084), 4 states have internal predecessors, (1084), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:17,974 INFO L175 Difference]: Start difference. First operand has 51 places, 48 transitions, 108 flow. Second operand 3 states and 373 transitions. [2023-08-26 18:55:17,974 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 53 places, 65 transitions, 248 flow [2023-08-26 18:55:17,975 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 51 places, 65 transitions, 244 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:55:17,976 INFO L231 Difference]: Finished difference. Result has 52 places, 48 transitions, 114 flow [2023-08-26 18:55:17,976 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=271, PETRI_DIFFERENCE_MINUEND_FLOW=104, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=48, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=46, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=114, PETRI_PLACES=52, PETRI_TRANSITIONS=48} [2023-08-26 18:55:17,977 INFO L281 CegarLoopForPetriNet]: 51 programPoint places, 1 predicate places. [2023-08-26 18:55:17,977 INFO L495 AbstractCegarLoop]: Abstraction has has 52 places, 48 transitions, 114 flow [2023-08-26 18:55:17,977 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 106.66666666666667) internal successors, (320), 3 states have internal predecessors, (320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:17,977 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:17,978 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 18:55:17,978 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 18:55:17,978 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-26 18:55:17,978 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:17,978 INFO L85 PathProgramCache]: Analyzing trace with hash 571513995, now seen corresponding path program 1 times [2023-08-26 18:55:17,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:17,978 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778400966] [2023-08-26 18:55:17,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:17,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:17,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:18,053 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 18:55:18,053 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:18,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778400966] [2023-08-26 18:55:18,053 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [778400966] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:55:18,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [364835072] [2023-08-26 18:55:18,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:18,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:55:18,054 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:55:18,056 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 18:55:18,104 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 18:55:18,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:18,137 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:55:18,140 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:55:18,186 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 18:55:18,218 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 18:55:18,218 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:55:18,258 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 18:55:18,258 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [364835072] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:55:18,259 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:55:18,259 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:55:18,259 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928180799] [2023-08-26 18:55:18,259 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:55:18,259 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:55:18,259 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:18,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:55:18,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:55:18,262 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 106 out of 271 [2023-08-26 18:55:18,263 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 52 places, 48 transitions, 114 flow. Second operand has 8 states, 8 states have (on average 107.875) internal successors, (863), 8 states have internal predecessors, (863), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:18,263 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:18,263 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 106 of 271 [2023-08-26 18:55:18,263 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:18,334 INFO L124 PetriNetUnfolderBase]: 33/103 cut-off events. [2023-08-26 18:55:18,335 INFO L125 PetriNetUnfolderBase]: For 15/15 co-relation queries the response was YES. [2023-08-26 18:55:18,336 INFO L83 FinitePrefix]: Finished finitePrefix Result has 242 conditions, 103 events. 33/103 cut-off events. For 15/15 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 348 event pairs, 0 based on Foata normal form. 16/109 useless extension candidates. Maximal degree in co-relation 196. Up to 64 conditions per place. [2023-08-26 18:55:18,336 INFO L140 encePairwiseOnDemand]: 267/271 looper letters, 11 selfloop transitions, 2 changer transitions 28/42 dead transitions. [2023-08-26 18:55:18,336 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 42 transitions, 169 flow [2023-08-26 18:55:18,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:55:18,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:55:18,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 463 transitions. [2023-08-26 18:55:18,337 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42712177121771217 [2023-08-26 18:55:18,337 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 463 transitions. [2023-08-26 18:55:18,337 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 463 transitions. [2023-08-26 18:55:18,338 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:18,338 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 463 transitions. [2023-08-26 18:55:18,339 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 115.75) internal successors, (463), 4 states have internal predecessors, (463), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:18,340 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 271.0) internal successors, (1355), 5 states have internal predecessors, (1355), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:18,340 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 271.0) internal successors, (1355), 5 states have internal predecessors, (1355), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:18,340 INFO L175 Difference]: Start difference. First operand has 52 places, 48 transitions, 114 flow. Second operand 4 states and 463 transitions. [2023-08-26 18:55:18,341 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 42 transitions, 169 flow [2023-08-26 18:55:18,341 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 42 transitions, 163 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-26 18:55:18,342 INFO L231 Difference]: Finished difference. Result has 30 places, 9 transitions, 27 flow [2023-08-26 18:55:18,342 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=271, PETRI_DIFFERENCE_MINUEND_FLOW=55, PETRI_DIFFERENCE_MINUEND_PLACES=27, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=25, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=27, PETRI_PLACES=30, PETRI_TRANSITIONS=9} [2023-08-26 18:55:18,343 INFO L281 CegarLoopForPetriNet]: 51 programPoint places, -21 predicate places. [2023-08-26 18:55:18,343 INFO L495 AbstractCegarLoop]: Abstraction has has 30 places, 9 transitions, 27 flow [2023-08-26 18:55:18,343 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 107.875) internal successors, (863), 8 states have internal predecessors, (863), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:18,343 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:18,343 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:55:18,350 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 18:55:18,548 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 18:55:18,549 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t_funErr0ASSERT_VIOLATIONASSERT === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-26 18:55:18,549 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:18,549 INFO L85 PathProgramCache]: Analyzing trace with hash -533569278, now seen corresponding path program 1 times [2023-08-26 18:55:18,549 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:18,550 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672555879] [2023-08-26 18:55:18,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:18,550 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:18,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:18,598 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 18:55:18,599 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:18,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672555879] [2023-08-26 18:55:18,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672555879] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:55:18,599 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:55:18,599 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:55:18,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430689707] [2023-08-26 18:55:18,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:55:18,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:55:18,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:18,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:55:18,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:55:18,601 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 113 out of 271 [2023-08-26 18:55:18,602 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 9 transitions, 27 flow. Second operand has 3 states, 3 states have (on average 115.33333333333333) internal successors, (346), 3 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:18,602 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:18,602 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 113 of 271 [2023-08-26 18:55:18,602 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:18,609 INFO L124 PetriNetUnfolderBase]: 6/21 cut-off events. [2023-08-26 18:55:18,609 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 18:55:18,609 INFO L83 FinitePrefix]: Finished finitePrefix Result has 53 conditions, 21 events. 6/21 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 29 event pairs, 6 based on Foata normal form. 3/24 useless extension candidates. Maximal degree in co-relation 38. Up to 20 conditions per place. [2023-08-26 18:55:18,609 INFO L140 encePairwiseOnDemand]: 269/271 looper letters, 0 selfloop transitions, 0 changer transitions 8/8 dead transitions. [2023-08-26 18:55:18,609 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 16 places, 8 transitions, 39 flow [2023-08-26 18:55:18,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:55:18,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:55:18,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 347 transitions. [2023-08-26 18:55:18,610 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4268142681426814 [2023-08-26 18:55:18,611 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 347 transitions. [2023-08-26 18:55:18,611 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 347 transitions. [2023-08-26 18:55:18,611 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:18,611 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 347 transitions. [2023-08-26 18:55:18,612 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 115.66666666666667) internal successors, (347), 3 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:18,613 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 271.0) internal successors, (1084), 4 states have internal predecessors, (1084), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:18,613 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 271.0) internal successors, (1084), 4 states have internal predecessors, (1084), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:18,613 INFO L175 Difference]: Start difference. First operand has 30 places, 9 transitions, 27 flow. Second operand 3 states and 347 transitions. [2023-08-26 18:55:18,613 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 16 places, 8 transitions, 39 flow [2023-08-26 18:55:18,614 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 14 places, 8 transitions, 36 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:55:18,614 INFO L231 Difference]: Finished difference. Result has 14 places, 0 transitions, 0 flow [2023-08-26 18:55:18,614 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=271, PETRI_DIFFERENCE_MINUEND_FLOW=22, PETRI_DIFFERENCE_MINUEND_PLACES=12, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=8, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=8, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=14, PETRI_TRANSITIONS=0} [2023-08-26 18:55:18,615 INFO L281 CegarLoopForPetriNet]: 51 programPoint places, -37 predicate places. [2023-08-26 18:55:18,615 INFO L495 AbstractCegarLoop]: Abstraction has has 14 places, 0 transitions, 0 flow [2023-08-26 18:55:18,615 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 115.33333333333333) internal successors, (346), 3 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:18,617 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (6 of 7 remaining) [2023-08-26 18:55:18,618 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 7 remaining) [2023-08-26 18:55:18,618 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (4 of 7 remaining) [2023-08-26 18:55:18,618 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (3 of 7 remaining) [2023-08-26 18:55:18,619 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 7 remaining) [2023-08-26 18:55:18,619 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 7 remaining) [2023-08-26 18:55:18,619 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 7 remaining) [2023-08-26 18:55:18,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 18:55:18,619 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 18:55:18,620 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:55:18,624 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 152 transitions, 312 flow [2023-08-26 18:55:18,634 INFO L124 PetriNetUnfolderBase]: 36/217 cut-off events. [2023-08-26 18:55:18,634 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:55:18,634 INFO L83 FinitePrefix]: Finished finitePrefix Result has 223 conditions, 217 events. 36/217 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 765 event pairs, 0 based on Foata normal form. 0/167 useless extension candidates. Maximal degree in co-relation 119. Up to 6 conditions per place. [2023-08-26 18:55:18,635 INFO L82 GeneralOperation]: Start removeDead. Operand has 131 places, 152 transitions, 312 flow [2023-08-26 18:55:18,635 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 127 places, 147 transitions, 299 flow [2023-08-26 18:55:18,635 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:55:18,636 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 127 places, 147 transitions, 299 flow [2023-08-26 18:55:18,636 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 127 places, 147 transitions, 299 flow [2023-08-26 18:55:18,636 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 127 places, 147 transitions, 299 flow [2023-08-26 18:55:18,645 INFO L124 PetriNetUnfolderBase]: 35/212 cut-off events. [2023-08-26 18:55:18,645 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:55:18,646 INFO L83 FinitePrefix]: Finished finitePrefix Result has 217 conditions, 212 events. 35/212 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 747 event pairs, 0 based on Foata normal form. 0/162 useless extension candidates. Maximal degree in co-relation 119. Up to 6 conditions per place. [2023-08-26 18:55:18,648 INFO L119 LiptonReduction]: Number of co-enabled transitions 6958 [2023-08-26 18:55:20,504 INFO L134 LiptonReduction]: Checked pairs total: 17118 [2023-08-26 18:55:20,505 INFO L136 LiptonReduction]: Total number of compositions: 116 [2023-08-26 18:55:20,511 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:55:20,511 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;@46136f12, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:55:20,511 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:55:20,515 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:55:20,515 INFO L124 PetriNetUnfolderBase]: 8/42 cut-off events. [2023-08-26 18:55:20,515 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:55:20,515 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:20,515 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 18:55:20,516 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:55:20,516 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:20,516 INFO L85 PathProgramCache]: Analyzing trace with hash -326904553, now seen corresponding path program 1 times [2023-08-26 18:55:20,516 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:20,516 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071175835] [2023-08-26 18:55:20,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:20,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:20,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:55:20,536 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:55:20,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:55:20,562 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:55:20,562 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:55:20,562 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:55:20,563 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 18:55:20,563 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:55:20,563 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:55:20,564 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:55:20,564 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 18:55:20,587 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 18:55:20,590 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 172 places, 203 transitions, 424 flow [2023-08-26 18:55:20,611 INFO L124 PetriNetUnfolderBase]: 62/360 cut-off events. [2023-08-26 18:55:20,611 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:55:20,612 INFO L83 FinitePrefix]: Finished finitePrefix Result has 374 conditions, 360 events. 62/360 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1441 event pairs, 0 based on Foata normal form. 0/275 useless extension candidates. Maximal degree in co-relation 219. Up to 9 conditions per place. [2023-08-26 18:55:20,612 INFO L82 GeneralOperation]: Start removeDead. Operand has 172 places, 203 transitions, 424 flow [2023-08-26 18:55:20,614 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 172 places, 203 transitions, 424 flow [2023-08-26 18:55:20,614 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:55:20,614 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 172 places, 203 transitions, 424 flow [2023-08-26 18:55:20,615 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 172 places, 203 transitions, 424 flow [2023-08-26 18:55:20,615 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 172 places, 203 transitions, 424 flow [2023-08-26 18:55:20,634 INFO L124 PetriNetUnfolderBase]: 62/360 cut-off events. [2023-08-26 18:55:20,635 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:55:20,636 INFO L83 FinitePrefix]: Finished finitePrefix Result has 374 conditions, 360 events. 62/360 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1441 event pairs, 0 based on Foata normal form. 0/275 useless extension candidates. Maximal degree in co-relation 219. Up to 9 conditions per place. [2023-08-26 18:55:20,643 INFO L119 LiptonReduction]: Number of co-enabled transitions 19796 [2023-08-26 18:55:22,790 INFO L134 LiptonReduction]: Checked pairs total: 46671 [2023-08-26 18:55:22,790 INFO L136 LiptonReduction]: Total number of compositions: 154 [2023-08-26 18:55:22,791 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:55:22,792 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;@46136f12, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:55:22,792 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-08-26 18:55:22,793 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:55:22,793 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:55:22,793 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:55:22,793 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:22,793 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:55:22,793 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 18:55:22,793 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:22,794 INFO L85 PathProgramCache]: Analyzing trace with hash 35926, now seen corresponding path program 1 times [2023-08-26 18:55:22,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:22,794 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26846694] [2023-08-26 18:55:22,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:22,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:22,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:22,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:55:22,829 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:22,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26846694] [2023-08-26 18:55:22,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26846694] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:55:22,830 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:55:22,830 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:55:22,830 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120771072] [2023-08-26 18:55:22,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:55:22,830 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:55:22,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:22,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:55:22,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:55:22,832 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 144 out of 357 [2023-08-26 18:55:22,832 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 103 transitions, 224 flow. Second operand has 3 states, 3 states have (on average 144.66666666666666) internal successors, (434), 3 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:22,832 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:22,832 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 144 of 357 [2023-08-26 18:55:22,832 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:23,459 INFO L124 PetriNetUnfolderBase]: 6104/10834 cut-off events. [2023-08-26 18:55:23,460 INFO L125 PetriNetUnfolderBase]: For 51/51 co-relation queries the response was YES. [2023-08-26 18:55:23,469 INFO L83 FinitePrefix]: Finished finitePrefix Result has 20322 conditions, 10834 events. 6104/10834 cut-off events. For 51/51 co-relation queries the response was YES. Maximal size of possible extension queue 401. Compared 84132 event pairs, 2664 based on Foata normal form. 1917/10212 useless extension candidates. Maximal degree in co-relation 3066. Up to 9380 conditions per place. [2023-08-26 18:55:23,500 INFO L140 encePairwiseOnDemand]: 325/357 looper letters, 62 selfloop transitions, 2 changer transitions 0/88 dead transitions. [2023-08-26 18:55:23,501 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 76 places, 88 transitions, 322 flow [2023-08-26 18:55:23,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:55:23,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:55:23,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 535 transitions. [2023-08-26 18:55:23,502 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4995331465919701 [2023-08-26 18:55:23,502 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 535 transitions. [2023-08-26 18:55:23,502 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 535 transitions. [2023-08-26 18:55:23,503 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:23,503 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 535 transitions. [2023-08-26 18:55:23,504 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 178.33333333333334) internal successors, (535), 3 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:23,505 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 357.0) internal successors, (1428), 4 states have internal predecessors, (1428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:23,505 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 357.0) internal successors, (1428), 4 states have internal predecessors, (1428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:23,506 INFO L175 Difference]: Start difference. First operand has 76 places, 103 transitions, 224 flow. Second operand 3 states and 535 transitions. [2023-08-26 18:55:23,506 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 76 places, 88 transitions, 322 flow [2023-08-26 18:55:23,508 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 76 places, 88 transitions, 322 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:55:23,509 INFO L231 Difference]: Finished difference. Result has 77 places, 74 transitions, 178 flow [2023-08-26 18:55:23,509 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=357, PETRI_DIFFERENCE_MINUEND_FLOW=164, PETRI_DIFFERENCE_MINUEND_PLACES=74, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=73, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=71, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=178, PETRI_PLACES=77, PETRI_TRANSITIONS=74} [2023-08-26 18:55:23,511 INFO L281 CegarLoopForPetriNet]: 76 programPoint places, 1 predicate places. [2023-08-26 18:55:23,511 INFO L495 AbstractCegarLoop]: Abstraction has has 77 places, 74 transitions, 178 flow [2023-08-26 18:55:23,511 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 144.66666666666666) internal successors, (434), 3 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:23,511 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:23,511 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:55:23,511 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 18:55:23,511 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 18:55:23,512 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:23,512 INFO L85 PathProgramCache]: Analyzing trace with hash 35927, now seen corresponding path program 1 times [2023-08-26 18:55:23,512 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:23,512 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1268049169] [2023-08-26 18:55:23,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:23,512 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:23,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:23,549 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 18:55:23,550 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:23,550 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1268049169] [2023-08-26 18:55:23,550 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1268049169] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:55:23,550 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:55:23,550 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:55:23,550 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897417713] [2023-08-26 18:55:23,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:55:23,550 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:55:23,550 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:23,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:55:23,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:55:23,551 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 149 out of 357 [2023-08-26 18:55:23,552 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 77 places, 74 transitions, 178 flow. Second operand has 3 states, 3 states have (on average 149.66666666666666) internal successors, (449), 3 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:23,552 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:23,552 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 149 of 357 [2023-08-26 18:55:23,552 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:24,080 INFO L124 PetriNetUnfolderBase]: 5443/9685 cut-off events. [2023-08-26 18:55:24,081 INFO L125 PetriNetUnfolderBase]: For 396/396 co-relation queries the response was YES. [2023-08-26 18:55:24,092 INFO L83 FinitePrefix]: Finished finitePrefix Result has 18672 conditions, 9685 events. 5443/9685 cut-off events. For 396/396 co-relation queries the response was YES. Maximal size of possible extension queue 372. Compared 74115 event pairs, 4672 based on Foata normal form. 0/7761 useless extension candidates. Maximal degree in co-relation 18576. Up to 7864 conditions per place. [2023-08-26 18:55:24,124 INFO L140 encePairwiseOnDemand]: 353/357 looper letters, 71 selfloop transitions, 2 changer transitions 0/97 dead transitions. [2023-08-26 18:55:24,124 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 77 places, 97 transitions, 370 flow [2023-08-26 18:55:24,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:55:24,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:55:24,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 521 transitions. [2023-08-26 18:55:24,125 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4864612511671335 [2023-08-26 18:55:24,125 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 521 transitions. [2023-08-26 18:55:24,126 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 521 transitions. [2023-08-26 18:55:24,126 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:24,126 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 521 transitions. [2023-08-26 18:55:24,127 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 173.66666666666666) internal successors, (521), 3 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:24,128 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 357.0) internal successors, (1428), 4 states have internal predecessors, (1428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:24,129 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 357.0) internal successors, (1428), 4 states have internal predecessors, (1428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:24,129 INFO L175 Difference]: Start difference. First operand has 77 places, 74 transitions, 178 flow. Second operand 3 states and 521 transitions. [2023-08-26 18:55:24,129 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 77 places, 97 transitions, 370 flow [2023-08-26 18:55:24,130 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 76 places, 97 transitions, 368 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:55:24,131 INFO L231 Difference]: Finished difference. Result has 76 places, 72 transitions, 176 flow [2023-08-26 18:55:24,131 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=357, PETRI_DIFFERENCE_MINUEND_FLOW=172, PETRI_DIFFERENCE_MINUEND_PLACES=74, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=72, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=70, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=176, PETRI_PLACES=76, PETRI_TRANSITIONS=72} [2023-08-26 18:55:24,133 INFO L281 CegarLoopForPetriNet]: 76 programPoint places, 0 predicate places. [2023-08-26 18:55:24,133 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 72 transitions, 176 flow [2023-08-26 18:55:24,133 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 149.66666666666666) internal successors, (449), 3 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:24,133 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:24,133 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:55:24,133 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-26 18:55:24,133 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 18:55:24,133 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:24,134 INFO L85 PathProgramCache]: Analyzing trace with hash -1153531704, now seen corresponding path program 1 times [2023-08-26 18:55:24,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:24,134 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769441246] [2023-08-26 18:55:24,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:24,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:24,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:24,213 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 18:55:24,213 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:24,213 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769441246] [2023-08-26 18:55:24,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [769441246] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:55:24,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508582031] [2023-08-26 18:55:24,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:24,214 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:55:24,214 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:55:24,215 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 18:55:24,217 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 18:55:24,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:24,262 INFO L262 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:55:24,263 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:55:24,271 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 18:55:24,301 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 18:55:24,301 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:55:24,330 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 18:55:24,330 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1508582031] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:55:24,330 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:55:24,330 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-08-26 18:55:24,330 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126684804] [2023-08-26 18:55:24,330 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:55:24,331 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 18:55:24,331 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:24,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 18:55:24,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-08-26 18:55:24,332 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 144 out of 357 [2023-08-26 18:55:24,333 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 72 transitions, 176 flow. Second operand has 7 states, 7 states have (on average 145.71428571428572) internal successors, (1020), 7 states have internal predecessors, (1020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:24,333 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:24,333 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 144 of 357 [2023-08-26 18:55:24,333 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:24,852 INFO L124 PetriNetUnfolderBase]: 4999/9054 cut-off events. [2023-08-26 18:55:24,852 INFO L125 PetriNetUnfolderBase]: For 387/387 co-relation queries the response was YES. [2023-08-26 18:55:24,862 INFO L83 FinitePrefix]: Finished finitePrefix Result has 17560 conditions, 9054 events. 4999/9054 cut-off events. For 387/387 co-relation queries the response was YES. Maximal size of possible extension queue 359. Compared 69265 event pairs, 645 based on Foata normal form. 12/7707 useless extension candidates. Maximal degree in co-relation 16330. Up to 6341 conditions per place. [2023-08-26 18:55:24,881 INFO L140 encePairwiseOnDemand]: 353/357 looper letters, 107 selfloop transitions, 4 changer transitions 0/135 dead transitions. [2023-08-26 18:55:24,881 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 79 places, 135 transitions, 522 flow [2023-08-26 18:55:24,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 18:55:24,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 18:55:24,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 834 transitions. [2023-08-26 18:55:24,883 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4672268907563025 [2023-08-26 18:55:24,883 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 834 transitions. [2023-08-26 18:55:24,883 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 834 transitions. [2023-08-26 18:55:24,884 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:24,884 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 834 transitions. [2023-08-26 18:55:24,885 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 166.8) internal successors, (834), 5 states have internal predecessors, (834), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:24,887 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 357.0) internal successors, (2142), 6 states have internal predecessors, (2142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:24,887 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 357.0) internal successors, (2142), 6 states have internal predecessors, (2142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:24,887 INFO L175 Difference]: Start difference. First operand has 76 places, 72 transitions, 176 flow. Second operand 5 states and 834 transitions. [2023-08-26 18:55:24,887 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 79 places, 135 transitions, 522 flow [2023-08-26 18:55:24,896 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 77 places, 135 transitions, 518 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:55:24,897 INFO L231 Difference]: Finished difference. Result has 77 places, 71 transitions, 176 flow [2023-08-26 18:55:24,897 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=357, PETRI_DIFFERENCE_MINUEND_FLOW=168, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=71, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=67, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=176, PETRI_PLACES=77, PETRI_TRANSITIONS=71} [2023-08-26 18:55:24,897 INFO L281 CegarLoopForPetriNet]: 76 programPoint places, 1 predicate places. [2023-08-26 18:55:24,897 INFO L495 AbstractCegarLoop]: Abstraction has has 77 places, 71 transitions, 176 flow [2023-08-26 18:55:24,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 145.71428571428572) internal successors, (1020), 7 states have internal predecessors, (1020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:24,898 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:24,898 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:55:24,905 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-08-26 18:55:25,105 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,SelfDestructingSolverStorable7 [2023-08-26 18:55:25,105 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t_funErr0ASSERT_VIOLATIONASSERT === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 18:55:25,105 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:25,105 INFO L85 PathProgramCache]: Analyzing trace with hash -1393250540, now seen corresponding path program 1 times [2023-08-26 18:55:25,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:25,106 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376967321] [2023-08-26 18:55:25,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:25,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:25,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:25,131 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 18:55:25,131 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:25,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376967321] [2023-08-26 18:55:25,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376967321] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:55:25,131 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:55:25,131 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:55:25,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494847347] [2023-08-26 18:55:25,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:55:25,132 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:55:25,132 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:25,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:55:25,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:55:25,132 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 144 out of 357 [2023-08-26 18:55:25,133 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 77 places, 71 transitions, 176 flow. Second operand has 3 states, 3 states have (on average 146.0) internal successors, (438), 3 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:25,133 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:25,133 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 144 of 357 [2023-08-26 18:55:25,133 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:25,872 INFO L124 PetriNetUnfolderBase]: 9365/15796 cut-off events. [2023-08-26 18:55:25,872 INFO L125 PetriNetUnfolderBase]: For 322/322 co-relation queries the response was YES. [2023-08-26 18:55:25,889 INFO L83 FinitePrefix]: Finished finitePrefix Result has 31078 conditions, 15796 events. 9365/15796 cut-off events. For 322/322 co-relation queries the response was YES. Maximal size of possible extension queue 519. Compared 116035 event pairs, 4200 based on Foata normal form. 0/13340 useless extension candidates. Maximal degree in co-relation 19468. Up to 8687 conditions per place. [2023-08-26 18:55:25,928 INFO L140 encePairwiseOnDemand]: 339/357 looper letters, 86 selfloop transitions, 11 changer transitions 1/111 dead transitions. [2023-08-26 18:55:25,929 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 79 places, 111 transitions, 456 flow [2023-08-26 18:55:25,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:55:25,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:55:25,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 535 transitions. [2023-08-26 18:55:25,930 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4995331465919701 [2023-08-26 18:55:25,930 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 535 transitions. [2023-08-26 18:55:25,930 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 535 transitions. [2023-08-26 18:55:25,931 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:25,931 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 535 transitions. [2023-08-26 18:55:25,932 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 178.33333333333334) internal successors, (535), 3 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:25,933 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 357.0) internal successors, (1428), 4 states have internal predecessors, (1428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:25,933 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 357.0) internal successors, (1428), 4 states have internal predecessors, (1428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:25,933 INFO L175 Difference]: Start difference. First operand has 77 places, 71 transitions, 176 flow. Second operand 3 states and 535 transitions. [2023-08-26 18:55:25,933 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 79 places, 111 transitions, 456 flow [2023-08-26 18:55:25,934 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 76 places, 111 transitions, 446 flow, removed 2 selfloop flow, removed 3 redundant places. [2023-08-26 18:55:25,936 INFO L231 Difference]: Finished difference. Result has 78 places, 79 transitions, 254 flow [2023-08-26 18:55:25,936 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=357, PETRI_DIFFERENCE_MINUEND_FLOW=166, PETRI_DIFFERENCE_MINUEND_PLACES=74, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=71, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=60, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=254, PETRI_PLACES=78, PETRI_TRANSITIONS=79} [2023-08-26 18:55:25,936 INFO L281 CegarLoopForPetriNet]: 76 programPoint places, 2 predicate places. [2023-08-26 18:55:25,936 INFO L495 AbstractCegarLoop]: Abstraction has has 78 places, 79 transitions, 254 flow [2023-08-26 18:55:25,937 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 146.0) internal successors, (438), 3 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:25,937 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:25,937 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:55:25,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 18:55:25,937 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0ASSERT_VIOLATIONASSERT === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 18:55:25,937 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:25,937 INFO L85 PathProgramCache]: Analyzing trace with hash 2004550561, now seen corresponding path program 1 times [2023-08-26 18:55:25,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:25,937 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469446885] [2023-08-26 18:55:25,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:25,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:25,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:25,972 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-08-26 18:55:25,972 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:25,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469446885] [2023-08-26 18:55:25,973 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1469446885] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:55:25,973 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:55:25,973 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 18:55:25,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291288932] [2023-08-26 18:55:25,973 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:55:25,973 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:55:25,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:25,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:55:25,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:55:25,974 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 132 out of 357 [2023-08-26 18:55:25,974 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 78 places, 79 transitions, 254 flow. Second operand has 3 states, 3 states have (on average 135.66666666666666) internal successors, (407), 3 states have internal predecessors, (407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:25,974 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:25,974 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 132 of 357 [2023-08-26 18:55:25,975 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:26,982 INFO L124 PetriNetUnfolderBase]: 11374/19653 cut-off events. [2023-08-26 18:55:26,982 INFO L125 PetriNetUnfolderBase]: For 4607/4669 co-relation queries the response was YES. [2023-08-26 18:55:27,001 INFO L83 FinitePrefix]: Finished finitePrefix Result has 44347 conditions, 19653 events. 11374/19653 cut-off events. For 4607/4669 co-relation queries the response was YES. Maximal size of possible extension queue 696. Compared 154102 event pairs, 4429 based on Foata normal form. 173/17829 useless extension candidates. Maximal degree in co-relation 39412. Up to 14033 conditions per place. [2023-08-26 18:55:27,042 INFO L140 encePairwiseOnDemand]: 340/357 looper letters, 98 selfloop transitions, 17 changer transitions 0/134 dead transitions. [2023-08-26 18:55:27,042 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 79 places, 134 transitions, 657 flow [2023-08-26 18:55:27,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:55:27,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:55:27,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 500 transitions. [2023-08-26 18:55:27,044 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4668534080298786 [2023-08-26 18:55:27,044 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 500 transitions. [2023-08-26 18:55:27,044 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 500 transitions. [2023-08-26 18:55:27,044 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:27,044 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 500 transitions. [2023-08-26 18:55:27,045 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 166.66666666666666) internal successors, (500), 3 states have internal predecessors, (500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:27,046 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 357.0) internal successors, (1428), 4 states have internal predecessors, (1428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:27,046 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 357.0) internal successors, (1428), 4 states have internal predecessors, (1428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:27,046 INFO L175 Difference]: Start difference. First operand has 78 places, 79 transitions, 254 flow. Second operand 3 states and 500 transitions. [2023-08-26 18:55:27,047 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 79 places, 134 transitions, 657 flow [2023-08-26 18:55:27,073 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 76 places, 134 transitions, 619 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-26 18:55:27,074 INFO L231 Difference]: Finished difference. Result has 77 places, 93 transitions, 337 flow [2023-08-26 18:55:27,074 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=357, PETRI_DIFFERENCE_MINUEND_FLOW=230, PETRI_DIFFERENCE_MINUEND_PLACES=74, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=79, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=62, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=337, PETRI_PLACES=77, PETRI_TRANSITIONS=93} [2023-08-26 18:55:27,075 INFO L281 CegarLoopForPetriNet]: 76 programPoint places, 1 predicate places. [2023-08-26 18:55:27,075 INFO L495 AbstractCegarLoop]: Abstraction has has 77 places, 93 transitions, 337 flow [2023-08-26 18:55:27,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 135.66666666666666) internal successors, (407), 3 states have internal predecessors, (407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:27,075 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:27,075 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:55:27,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 18:55:27,075 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting t_funErr0ASSERT_VIOLATIONASSERT === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 18:55:27,076 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:27,076 INFO L85 PathProgramCache]: Analyzing trace with hash 46975004, now seen corresponding path program 1 times [2023-08-26 18:55:27,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:27,076 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797480800] [2023-08-26 18:55:27,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:27,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:27,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:27,130 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 18:55:27,131 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:27,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797480800] [2023-08-26 18:55:27,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797480800] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:55:27,131 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:55:27,131 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 18:55:27,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038887297] [2023-08-26 18:55:27,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:55:27,131 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 18:55:27,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:27,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 18:55:27,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-08-26 18:55:27,132 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 142 out of 357 [2023-08-26 18:55:27,133 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 77 places, 93 transitions, 337 flow. Second operand has 5 states, 5 states have (on average 145.2) internal successors, (726), 5 states have internal predecessors, (726), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:27,133 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:27,133 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 142 of 357 [2023-08-26 18:55:27,133 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:28,219 INFO L124 PetriNetUnfolderBase]: 10884/18592 cut-off events. [2023-08-26 18:55:28,220 INFO L125 PetriNetUnfolderBase]: For 5915/6399 co-relation queries the response was YES. [2023-08-26 18:55:28,238 INFO L83 FinitePrefix]: Finished finitePrefix Result has 48213 conditions, 18592 events. 10884/18592 cut-off events. For 5915/6399 co-relation queries the response was YES. Maximal size of possible extension queue 752. Compared 144516 event pairs, 3011 based on Foata normal form. 121/15847 useless extension candidates. Maximal degree in co-relation 42539. Up to 8872 conditions per place. [2023-08-26 18:55:28,277 INFO L140 encePairwiseOnDemand]: 344/357 looper letters, 161 selfloop transitions, 20 changer transitions 0/198 dead transitions. [2023-08-26 18:55:28,277 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 83 places, 198 transitions, 1071 flow [2023-08-26 18:55:28,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 18:55:28,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 18:55:28,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1155 transitions. [2023-08-26 18:55:28,280 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46218487394957986 [2023-08-26 18:55:28,280 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1155 transitions. [2023-08-26 18:55:28,280 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1155 transitions. [2023-08-26 18:55:28,280 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:28,280 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1155 transitions. [2023-08-26 18:55:28,282 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 165.0) internal successors, (1155), 7 states have internal predecessors, (1155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:28,284 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 357.0) internal successors, (2856), 8 states have internal predecessors, (2856), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:28,284 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 357.0) internal successors, (2856), 8 states have internal predecessors, (2856), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:28,285 INFO L175 Difference]: Start difference. First operand has 77 places, 93 transitions, 337 flow. Second operand 7 states and 1155 transitions. [2023-08-26 18:55:28,285 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 83 places, 198 transitions, 1071 flow [2023-08-26 18:55:28,292 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 82 places, 198 transitions, 1029 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:55:28,294 INFO L231 Difference]: Finished difference. Result has 83 places, 99 transitions, 395 flow [2023-08-26 18:55:28,294 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=357, PETRI_DIFFERENCE_MINUEND_FLOW=320, PETRI_DIFFERENCE_MINUEND_PLACES=76, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=93, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=16, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=76, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=395, PETRI_PLACES=83, PETRI_TRANSITIONS=99} [2023-08-26 18:55:28,294 INFO L281 CegarLoopForPetriNet]: 76 programPoint places, 7 predicate places. [2023-08-26 18:55:28,294 INFO L495 AbstractCegarLoop]: Abstraction has has 83 places, 99 transitions, 395 flow [2023-08-26 18:55:28,295 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 145.2) internal successors, (726), 5 states have internal predecessors, (726), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:28,295 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:28,295 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:55:28,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-08-26 18:55:28,295 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 18:55:28,295 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:28,295 INFO L85 PathProgramCache]: Analyzing trace with hash -1168585674, now seen corresponding path program 1 times [2023-08-26 18:55:28,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:28,295 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [948771082] [2023-08-26 18:55:28,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:28,295 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:28,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:28,327 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 18:55:28,327 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:28,328 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [948771082] [2023-08-26 18:55:28,328 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [948771082] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:55:28,328 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031446798] [2023-08-26 18:55:28,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:28,328 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:55:28,328 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:55:28,329 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 18:55:28,331 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 18:55:28,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:28,387 INFO L262 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:55:28,388 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:55:28,403 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 18:55:28,403 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:55:28,424 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 18:55:28,424 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1031446798] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:55:28,424 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:55:28,425 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-08-26 18:55:28,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492960072] [2023-08-26 18:55:28,425 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:55:28,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-08-26 18:55:28,425 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:28,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-08-26 18:55:28,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2023-08-26 18:55:28,426 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 155 out of 357 [2023-08-26 18:55:28,427 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 83 places, 99 transitions, 395 flow. Second operand has 9 states, 9 states have (on average 157.88888888888889) internal successors, (1421), 9 states have internal predecessors, (1421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:28,427 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:28,427 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 155 of 357 [2023-08-26 18:55:28,427 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:28,462 INFO L124 PetriNetUnfolderBase]: 95/217 cut-off events. [2023-08-26 18:55:28,463 INFO L125 PetriNetUnfolderBase]: For 118/131 co-relation queries the response was YES. [2023-08-26 18:55:28,463 INFO L83 FinitePrefix]: Finished finitePrefix Result has 582 conditions, 217 events. 95/217 cut-off events. For 118/131 co-relation queries the response was YES. Maximal size of possible extension queue 21. Compared 884 event pairs, 4 based on Foata normal form. 20/236 useless extension candidates. Maximal degree in co-relation 574. Up to 140 conditions per place. [2023-08-26 18:55:28,463 INFO L140 encePairwiseOnDemand]: 354/357 looper letters, 0 selfloop transitions, 0 changer transitions 40/40 dead transitions. [2023-08-26 18:55:28,463 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 36 places, 40 transitions, 218 flow [2023-08-26 18:55:28,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 18:55:28,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 18:55:28,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 805 transitions. [2023-08-26 18:55:28,465 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45098039215686275 [2023-08-26 18:55:28,465 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 805 transitions. [2023-08-26 18:55:28,465 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 805 transitions. [2023-08-26 18:55:28,466 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:28,466 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 805 transitions. [2023-08-26 18:55:28,467 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 161.0) internal successors, (805), 5 states have internal predecessors, (805), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:28,468 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 357.0) internal successors, (2142), 6 states have internal predecessors, (2142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:28,469 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 357.0) internal successors, (2142), 6 states have internal predecessors, (2142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:28,469 INFO L175 Difference]: Start difference. First operand has 83 places, 99 transitions, 395 flow. Second operand 5 states and 805 transitions. [2023-08-26 18:55:28,469 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 36 places, 40 transitions, 218 flow [2023-08-26 18:55:28,469 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 40 transitions, 203 flow, removed 6 selfloop flow, removed 3 redundant places. [2023-08-26 18:55:28,470 INFO L231 Difference]: Finished difference. Result has 33 places, 0 transitions, 0 flow [2023-08-26 18:55:28,470 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=357, PETRI_DIFFERENCE_MINUEND_FLOW=79, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=23, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=33, PETRI_TRANSITIONS=0} [2023-08-26 18:55:28,470 INFO L281 CegarLoopForPetriNet]: 76 programPoint places, -43 predicate places. [2023-08-26 18:55:28,470 INFO L495 AbstractCegarLoop]: Abstraction has has 33 places, 0 transitions, 0 flow [2023-08-26 18:55:28,471 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 157.88888888888889) internal successors, (1421), 9 states have internal predecessors, (1421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:28,471 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (7 of 8 remaining) [2023-08-26 18:55:28,471 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 8 remaining) [2023-08-26 18:55:28,471 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (5 of 8 remaining) [2023-08-26 18:55:28,471 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (4 of 8 remaining) [2023-08-26 18:55:28,471 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (3 of 8 remaining) [2023-08-26 18:55:28,471 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 8 remaining) [2023-08-26 18:55:28,471 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 8 remaining) [2023-08-26 18:55:28,471 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 8 remaining) [2023-08-26 18:55:28,478 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-08-26 18:55:28,678 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:55:28,680 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:55:28,681 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:55:28,682 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 172 places, 203 transitions, 424 flow [2023-08-26 18:55:28,703 INFO L124 PetriNetUnfolderBase]: 62/360 cut-off events. [2023-08-26 18:55:28,704 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:55:28,705 INFO L83 FinitePrefix]: Finished finitePrefix Result has 374 conditions, 360 events. 62/360 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1441 event pairs, 0 based on Foata normal form. 0/275 useless extension candidates. Maximal degree in co-relation 219. Up to 9 conditions per place. [2023-08-26 18:55:28,705 INFO L82 GeneralOperation]: Start removeDead. Operand has 172 places, 203 transitions, 424 flow [2023-08-26 18:55:28,706 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 172 places, 203 transitions, 424 flow [2023-08-26 18:55:28,706 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:55:28,706 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 172 places, 203 transitions, 424 flow [2023-08-26 18:55:28,706 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 172 places, 203 transitions, 424 flow [2023-08-26 18:55:28,706 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 172 places, 203 transitions, 424 flow [2023-08-26 18:55:28,727 INFO L124 PetriNetUnfolderBase]: 62/360 cut-off events. [2023-08-26 18:55:28,727 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:55:28,728 INFO L83 FinitePrefix]: Finished finitePrefix Result has 374 conditions, 360 events. 62/360 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1441 event pairs, 0 based on Foata normal form. 0/275 useless extension candidates. Maximal degree in co-relation 219. Up to 9 conditions per place. [2023-08-26 18:55:28,735 INFO L119 LiptonReduction]: Number of co-enabled transitions 19796 [2023-08-26 18:55:30,807 INFO L134 LiptonReduction]: Checked pairs total: 51936 [2023-08-26 18:55:30,807 INFO L136 LiptonReduction]: Total number of compositions: 154 [2023-08-26 18:55:30,813 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:55:30,813 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;@46136f12, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:55:30,813 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:55:30,817 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:55:30,817 INFO L124 PetriNetUnfolderBase]: 29/115 cut-off events. [2023-08-26 18:55:30,817 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 18:55:30,818 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:30,818 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 18:55:30,818 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:55:30,818 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:30,818 INFO L85 PathProgramCache]: Analyzing trace with hash 1451188737, now seen corresponding path program 1 times [2023-08-26 18:55:30,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:30,818 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632311760] [2023-08-26 18:55:30,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:30,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:30,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:55:30,826 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:55:30,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:55:30,836 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:55:30,837 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:55:30,837 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:55:30,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 18:55:30,837 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:55:30,838 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:55:30,838 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:55:30,838 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 18:55:30,858 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 18:55:30,860 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 213 places, 254 transitions, 538 flow [2023-08-26 18:55:30,895 INFO L124 PetriNetUnfolderBase]: 93/540 cut-off events. [2023-08-26 18:55:30,895 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:55:30,899 INFO L83 FinitePrefix]: Finished finitePrefix Result has 568 conditions, 540 events. 93/540 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2277 event pairs, 1 based on Foata normal form. 0/412 useless extension candidates. Maximal degree in co-relation 368. Up to 16 conditions per place. [2023-08-26 18:55:30,899 INFO L82 GeneralOperation]: Start removeDead. Operand has 213 places, 254 transitions, 538 flow [2023-08-26 18:55:30,903 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 213 places, 254 transitions, 538 flow [2023-08-26 18:55:30,905 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:55:30,905 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 213 places, 254 transitions, 538 flow [2023-08-26 18:55:30,905 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 213 places, 254 transitions, 538 flow [2023-08-26 18:55:30,905 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 213 places, 254 transitions, 538 flow [2023-08-26 18:55:30,936 INFO L124 PetriNetUnfolderBase]: 93/540 cut-off events. [2023-08-26 18:55:30,936 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:55:30,940 INFO L83 FinitePrefix]: Finished finitePrefix Result has 568 conditions, 540 events. 93/540 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2277 event pairs, 1 based on Foata normal form. 0/412 useless extension candidates. Maximal degree in co-relation 368. Up to 16 conditions per place. [2023-08-26 18:55:30,947 INFO L119 LiptonReduction]: Number of co-enabled transitions 37338 [2023-08-26 18:55:33,069 INFO L134 LiptonReduction]: Checked pairs total: 107037 [2023-08-26 18:55:33,070 INFO L136 LiptonReduction]: Total number of compositions: 188 [2023-08-26 18:55:33,071 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:55:33,071 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;@46136f12, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:55:33,071 INFO L358 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2023-08-26 18:55:33,072 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:55:33,072 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:55:33,072 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:55:33,072 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:33,072 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:55:33,072 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 18:55:33,072 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:33,073 INFO L85 PathProgramCache]: Analyzing trace with hash 56659, now seen corresponding path program 1 times [2023-08-26 18:55:33,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:33,073 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600538301] [2023-08-26 18:55:33,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:33,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:33,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:33,110 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 18:55:33,110 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:33,110 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600538301] [2023-08-26 18:55:33,110 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600538301] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:55:33,110 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:55:33,110 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:55:33,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771283842] [2023-08-26 18:55:33,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:55:33,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:55:33,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:33,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:55:33,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:55:33,111 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 182 out of 442 [2023-08-26 18:55:33,112 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 98 places, 134 transitions, 298 flow. Second operand has 3 states, 3 states have (on average 182.66666666666666) internal successors, (548), 3 states have internal predecessors, (548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:33,112 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:33,112 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 182 of 442 [2023-08-26 18:55:33,112 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:46,041 INFO L124 PetriNetUnfolderBase]: 174664/256603 cut-off events. [2023-08-26 18:55:46,041 INFO L125 PetriNetUnfolderBase]: For 2091/2091 co-relation queries the response was YES. [2023-08-26 18:55:46,377 INFO L83 FinitePrefix]: Finished finitePrefix Result has 494543 conditions, 256603 events. 174664/256603 cut-off events. For 2091/2091 co-relation queries the response was YES. Maximal size of possible extension queue 6058. Compared 2177165 event pairs, 106301 based on Foata normal form. 41193/241010 useless extension candidates. Maximal degree in co-relation 28121. Up to 236151 conditions per place. [2023-08-26 18:55:47,088 INFO L140 encePairwiseOnDemand]: 401/442 looper letters, 83 selfloop transitions, 2 changer transitions 0/111 dead transitions. [2023-08-26 18:55:47,089 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 98 places, 111 transitions, 422 flow [2023-08-26 18:55:47,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:55:47,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:55:47,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 679 transitions. [2023-08-26 18:55:47,091 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5120663650075414 [2023-08-26 18:55:47,092 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 679 transitions. [2023-08-26 18:55:47,092 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 679 transitions. [2023-08-26 18:55:47,092 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:55:47,092 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 679 transitions. [2023-08-26 18:55:47,093 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 226.33333333333334) internal successors, (679), 3 states have internal predecessors, (679), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:47,094 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 442.0) internal successors, (1768), 4 states have internal predecessors, (1768), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:47,095 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 442.0) internal successors, (1768), 4 states have internal predecessors, (1768), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:47,095 INFO L175 Difference]: Start difference. First operand has 98 places, 134 transitions, 298 flow. Second operand 3 states and 679 transitions. [2023-08-26 18:55:47,095 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 98 places, 111 transitions, 422 flow [2023-08-26 18:55:47,096 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 98 places, 111 transitions, 422 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:55:47,097 INFO L231 Difference]: Finished difference. Result has 99 places, 96 transitions, 234 flow [2023-08-26 18:55:47,097 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=442, PETRI_DIFFERENCE_MINUEND_FLOW=220, PETRI_DIFFERENCE_MINUEND_PLACES=96, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=95, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=93, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=234, PETRI_PLACES=99, PETRI_TRANSITIONS=96} [2023-08-26 18:55:47,098 INFO L281 CegarLoopForPetriNet]: 98 programPoint places, 1 predicate places. [2023-08-26 18:55:47,098 INFO L495 AbstractCegarLoop]: Abstraction has has 99 places, 96 transitions, 234 flow [2023-08-26 18:55:47,098 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 182.66666666666666) internal successors, (548), 3 states have internal predecessors, (548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:47,098 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:55:47,098 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:55:47,098 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-26 18:55:47,098 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 18:55:47,098 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:55:47,098 INFO L85 PathProgramCache]: Analyzing trace with hash 56658, now seen corresponding path program 1 times [2023-08-26 18:55:47,098 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:55:47,099 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228343856] [2023-08-26 18:55:47,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:55:47,099 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:55:47,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:55:47,111 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 18:55:47,111 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:55:47,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [228343856] [2023-08-26 18:55:47,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [228343856] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:55:47,111 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:55:47,112 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:55:47,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229154739] [2023-08-26 18:55:47,112 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:55:47,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:55:47,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:55:47,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:55:47,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:55:47,113 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 187 out of 442 [2023-08-26 18:55:47,113 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 99 places, 96 transitions, 234 flow. Second operand has 3 states, 3 states have (on average 187.66666666666666) internal successors, (563), 3 states have internal predecessors, (563), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:55:47,113 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:55:47,113 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 187 of 442 [2023-08-26 18:55:47,113 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:55:58,983 INFO L124 PetriNetUnfolderBase]: 156665/230210 cut-off events. [2023-08-26 18:55:58,983 INFO L125 PetriNetUnfolderBase]: For 7862/7862 co-relation queries the response was YES. [2023-08-26 18:55:59,381 INFO L83 FinitePrefix]: Finished finitePrefix Result has 452598 conditions, 230210 events. 156665/230210 cut-off events. For 7862/7862 co-relation queries the response was YES. Maximal size of possible extension queue 5613. Compared 1935056 event pairs, 136288 based on Foata normal form. 0/185837 useless extension candidates. Maximal degree in co-relation 452497. Up to 199103 conditions per place. [2023-08-26 18:56:00,117 INFO L140 encePairwiseOnDemand]: 438/442 looper letters, 108 selfloop transitions, 2 changer transitions 0/136 dead transitions. [2023-08-26 18:56:00,117 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 99 places, 136 transitions, 534 flow [2023-08-26 18:56:00,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:56:00,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:56:00,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 672 transitions. [2023-08-26 18:56:00,119 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5067873303167421 [2023-08-26 18:56:00,119 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 672 transitions. [2023-08-26 18:56:00,119 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 672 transitions. [2023-08-26 18:56:00,120 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:56:00,120 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 672 transitions. [2023-08-26 18:56:00,121 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 224.0) internal successors, (672), 3 states have internal predecessors, (672), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:00,122 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 442.0) internal successors, (1768), 4 states have internal predecessors, (1768), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:00,123 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 442.0) internal successors, (1768), 4 states have internal predecessors, (1768), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:00,123 INFO L175 Difference]: Start difference. First operand has 99 places, 96 transitions, 234 flow. Second operand 3 states and 672 transitions. [2023-08-26 18:56:00,123 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 99 places, 136 transitions, 534 flow [2023-08-26 18:56:00,126 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 98 places, 136 transitions, 532 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:56:00,127 INFO L231 Difference]: Finished difference. Result has 98 places, 94 transitions, 232 flow [2023-08-26 18:56:00,128 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=442, PETRI_DIFFERENCE_MINUEND_FLOW=228, PETRI_DIFFERENCE_MINUEND_PLACES=96, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=94, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=92, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=232, PETRI_PLACES=98, PETRI_TRANSITIONS=94} [2023-08-26 18:56:00,128 INFO L281 CegarLoopForPetriNet]: 98 programPoint places, 0 predicate places. [2023-08-26 18:56:00,128 INFO L495 AbstractCegarLoop]: Abstraction has has 98 places, 94 transitions, 232 flow [2023-08-26 18:56:00,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 187.66666666666666) internal successors, (563), 3 states have internal predecessors, (563), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:00,128 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:56:00,129 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:56:00,129 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-26 18:56:00,129 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 18:56:00,129 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:56:00,129 INFO L85 PathProgramCache]: Analyzing trace with hash 831800096, now seen corresponding path program 1 times [2023-08-26 18:56:00,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:56:00,129 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827503365] [2023-08-26 18:56:00,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:56:00,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:56:00,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:56:00,171 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 18:56:00,171 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:56:00,171 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827503365] [2023-08-26 18:56:00,171 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [827503365] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:56:00,171 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477697688] [2023-08-26 18:56:00,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:56:00,172 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:56:00,172 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:56:00,172 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 18:56:00,174 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 18:56:00,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:56:00,232 INFO L262 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:56:00,233 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:56:00,242 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 18:56:00,268 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 18:56:00,268 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:56:00,296 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 18:56:00,296 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477697688] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:56:00,296 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:56:00,296 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-08-26 18:56:00,296 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113110687] [2023-08-26 18:56:00,296 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:56:00,297 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 18:56:00,297 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:56:00,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 18:56:00,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-08-26 18:56:00,298 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 182 out of 442 [2023-08-26 18:56:00,299 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 98 places, 94 transitions, 232 flow. Second operand has 7 states, 7 states have (on average 183.71428571428572) internal successors, (1286), 7 states have internal predecessors, (1286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:00,299 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:56:00,299 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 182 of 442 [2023-08-26 18:56:00,300 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:56:11,168 INFO L124 PetriNetUnfolderBase]: 147929/221645 cut-off events. [2023-08-26 18:56:11,168 INFO L125 PetriNetUnfolderBase]: For 11425/11425 co-relation queries the response was YES. [2023-08-26 18:56:11,552 INFO L83 FinitePrefix]: Finished finitePrefix Result has 438287 conditions, 221645 events. 147929/221645 cut-off events. For 11425/11425 co-relation queries the response was YES. Maximal size of possible extension queue 5602. Compared 1918801 event pairs, 14390 based on Foata normal form. 13/186964 useless extension candidates. Maximal degree in co-relation 409384. Up to 168200 conditions per place. [2023-08-26 18:56:12,162 INFO L140 encePairwiseOnDemand]: 438/442 looper letters, 191 selfloop transitions, 6 changer transitions 0/223 dead transitions. [2023-08-26 18:56:12,162 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 102 places, 223 transitions, 886 flow [2023-08-26 18:56:12,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:56:12,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:56:12,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1293 transitions. [2023-08-26 18:56:12,164 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48755656108597284 [2023-08-26 18:56:12,165 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1293 transitions. [2023-08-26 18:56:12,165 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1293 transitions. [2023-08-26 18:56:12,165 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:56:12,165 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1293 transitions. [2023-08-26 18:56:12,167 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 215.5) internal successors, (1293), 6 states have internal predecessors, (1293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:12,169 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 442.0) internal successors, (3094), 7 states have internal predecessors, (3094), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:12,169 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 442.0) internal successors, (3094), 7 states have internal predecessors, (3094), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:12,170 INFO L175 Difference]: Start difference. First operand has 98 places, 94 transitions, 232 flow. Second operand 6 states and 1293 transitions. [2023-08-26 18:56:12,170 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 102 places, 223 transitions, 886 flow [2023-08-26 18:56:13,956 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 100 places, 223 transitions, 882 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:56:13,957 INFO L231 Difference]: Finished difference. Result has 100 places, 95 transitions, 244 flow [2023-08-26 18:56:13,958 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=442, PETRI_DIFFERENCE_MINUEND_FLOW=224, PETRI_DIFFERENCE_MINUEND_PLACES=95, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=93, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=89, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=244, PETRI_PLACES=100, PETRI_TRANSITIONS=95} [2023-08-26 18:56:13,958 INFO L281 CegarLoopForPetriNet]: 98 programPoint places, 2 predicate places. [2023-08-26 18:56:13,958 INFO L495 AbstractCegarLoop]: Abstraction has has 100 places, 95 transitions, 244 flow [2023-08-26 18:56:13,959 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 183.71428571428572) internal successors, (1286), 7 states have internal predecessors, (1286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:13,959 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:56:13,959 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:56:13,963 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-08-26 18:56:14,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-08-26 18:56:14,163 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t_funErr0ASSERT_VIOLATIONASSERT === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 18:56:14,163 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:56:14,164 INFO L85 PathProgramCache]: Analyzing trace with hash 24669049, now seen corresponding path program 1 times [2023-08-26 18:56:14,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:56:14,164 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290901746] [2023-08-26 18:56:14,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:56:14,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:56:14,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:56:14,192 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 18:56:14,192 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:56:14,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290901746] [2023-08-26 18:56:14,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290901746] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:56:14,192 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:56:14,192 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:56:14,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097489562] [2023-08-26 18:56:14,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:56:14,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:56:14,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:56:14,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:56:14,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:56:14,194 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 175 out of 442 [2023-08-26 18:56:14,194 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 100 places, 95 transitions, 244 flow. Second operand has 3 states, 3 states have (on average 177.33333333333334) internal successors, (532), 3 states have internal predecessors, (532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:14,194 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:56:14,194 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 175 of 442 [2023-08-26 18:56:14,194 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:56:35,730 INFO L124 PetriNetUnfolderBase]: 315533/453696 cut-off events. [2023-08-26 18:56:35,730 INFO L125 PetriNetUnfolderBase]: For 5320/5320 co-relation queries the response was YES. [2023-08-26 18:56:36,476 INFO L83 FinitePrefix]: Finished finitePrefix Result has 897064 conditions, 453696 events. 315533/453696 cut-off events. For 5320/5320 co-relation queries the response was YES. Maximal size of possible extension queue 10110. Compared 3842924 event pairs, 139107 based on Foata normal form. 0/391690 useless extension candidates. Maximal degree in co-relation 314617. Up to 259683 conditions per place. [2023-08-26 18:56:37,852 INFO L140 encePairwiseOnDemand]: 419/442 looper letters, 124 selfloop transitions, 13 changer transitions 1/152 dead transitions. [2023-08-26 18:56:37,852 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 102 places, 152 transitions, 641 flow [2023-08-26 18:56:37,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:56:37,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:56:37,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 669 transitions. [2023-08-26 18:56:37,854 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.504524886877828 [2023-08-26 18:56:37,854 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 669 transitions. [2023-08-26 18:56:37,854 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 669 transitions. [2023-08-26 18:56:37,854 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:56:37,854 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 669 transitions. [2023-08-26 18:56:37,855 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 223.0) internal successors, (669), 3 states have internal predecessors, (669), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:37,856 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 442.0) internal successors, (1768), 4 states have internal predecessors, (1768), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:37,857 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 442.0) internal successors, (1768), 4 states have internal predecessors, (1768), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:37,857 INFO L175 Difference]: Start difference. First operand has 100 places, 95 transitions, 244 flow. Second operand 3 states and 669 transitions. [2023-08-26 18:56:37,857 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 102 places, 152 transitions, 641 flow [2023-08-26 18:56:37,869 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 99 places, 152 transitions, 626 flow, removed 4 selfloop flow, removed 3 redundant places. [2023-08-26 18:56:37,870 INFO L231 Difference]: Finished difference. Result has 101 places, 105 transitions, 337 flow [2023-08-26 18:56:37,870 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=442, PETRI_DIFFERENCE_MINUEND_FLOW=229, PETRI_DIFFERENCE_MINUEND_PLACES=97, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=95, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=82, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=337, PETRI_PLACES=101, PETRI_TRANSITIONS=105} [2023-08-26 18:56:37,871 INFO L281 CegarLoopForPetriNet]: 98 programPoint places, 3 predicate places. [2023-08-26 18:56:37,871 INFO L495 AbstractCegarLoop]: Abstraction has has 101 places, 105 transitions, 337 flow [2023-08-26 18:56:37,871 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 177.33333333333334) internal successors, (532), 3 states have internal predecessors, (532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:37,871 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:56:37,871 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:56:37,871 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-26 18:56:37,871 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0ASSERT_VIOLATIONASSERT === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 18:56:37,871 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:56:37,871 INFO L85 PathProgramCache]: Analyzing trace with hash 595380736, now seen corresponding path program 1 times [2023-08-26 18:56:37,871 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:56:37,871 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728866306] [2023-08-26 18:56:37,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:56:37,872 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:56:37,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:56:37,901 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 18:56:37,901 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:56:37,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728866306] [2023-08-26 18:56:37,901 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1728866306] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:56:37,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1097534620] [2023-08-26 18:56:37,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:56:37,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:56:37,901 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:56:37,902 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:56:37,904 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-08-26 18:56:37,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:56:37,969 INFO L262 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:56:37,970 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:56:37,985 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 18:56:37,985 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:56:38,012 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 18:56:38,012 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1097534620] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:56:38,012 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:56:38,012 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-08-26 18:56:38,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292163194] [2023-08-26 18:56:38,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:56:38,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-08-26 18:56:38,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:56:38,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-08-26 18:56:38,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2023-08-26 18:56:38,014 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 193 out of 442 [2023-08-26 18:56:38,024 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 101 places, 105 transitions, 337 flow. Second operand has 9 states, 9 states have (on average 195.88888888888889) internal successors, (1763), 9 states have internal predecessors, (1763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:38,024 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:56:38,024 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 193 of 442 [2023-08-26 18:56:38,024 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:56:38,205 INFO L124 PetriNetUnfolderBase]: 2174/3302 cut-off events. [2023-08-26 18:56:38,205 INFO L125 PetriNetUnfolderBase]: For 771/771 co-relation queries the response was YES. [2023-08-26 18:56:38,208 INFO L83 FinitePrefix]: Finished finitePrefix Result has 7358 conditions, 3302 events. 2174/3302 cut-off events. For 771/771 co-relation queries the response was YES. Maximal size of possible extension queue 141. Compared 16304 event pairs, 61 based on Foata normal form. 337/3598 useless extension candidates. Maximal degree in co-relation 7346. Up to 2067 conditions per place. [2023-08-26 18:56:38,209 INFO L140 encePairwiseOnDemand]: 439/442 looper letters, 0 selfloop transitions, 0 changer transitions 62/62 dead transitions. [2023-08-26 18:56:38,209 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 62 transitions, 280 flow [2023-08-26 18:56:38,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:56:38,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:56:38,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1219 transitions. [2023-08-26 18:56:38,211 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45965309200603316 [2023-08-26 18:56:38,212 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1219 transitions. [2023-08-26 18:56:38,212 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1219 transitions. [2023-08-26 18:56:38,212 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:56:38,212 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1219 transitions. [2023-08-26 18:56:38,214 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 203.16666666666666) internal successors, (1219), 6 states have internal predecessors, (1219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:38,216 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 442.0) internal successors, (3094), 7 states have internal predecessors, (3094), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:38,216 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 442.0) internal successors, (3094), 7 states have internal predecessors, (3094), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:38,216 INFO L175 Difference]: Start difference. First operand has 101 places, 105 transitions, 337 flow. Second operand 6 states and 1219 transitions. [2023-08-26 18:56:38,216 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 62 transitions, 280 flow [2023-08-26 18:56:38,217 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 62 transitions, 276 flow, removed 1 selfloop flow, removed 2 redundant places. [2023-08-26 18:56:38,217 INFO L231 Difference]: Finished difference. Result has 43 places, 0 transitions, 0 flow [2023-08-26 18:56:38,217 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=442, PETRI_DIFFERENCE_MINUEND_FLOW=82, PETRI_DIFFERENCE_MINUEND_PLACES=38, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=27, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=43, PETRI_TRANSITIONS=0} [2023-08-26 18:56:38,218 INFO L281 CegarLoopForPetriNet]: 98 programPoint places, -55 predicate places. [2023-08-26 18:56:38,218 INFO L495 AbstractCegarLoop]: Abstraction has has 43 places, 0 transitions, 0 flow [2023-08-26 18:56:38,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 195.88888888888889) internal successors, (1763), 9 states have internal predecessors, (1763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:38,218 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (8 of 9 remaining) [2023-08-26 18:56:38,218 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 9 remaining) [2023-08-26 18:56:38,218 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (6 of 9 remaining) [2023-08-26 18:56:38,218 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (5 of 9 remaining) [2023-08-26 18:56:38,218 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (4 of 9 remaining) [2023-08-26 18:56:38,219 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (3 of 9 remaining) [2023-08-26 18:56:38,219 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 9 remaining) [2023-08-26 18:56:38,219 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 9 remaining) [2023-08-26 18:56:38,219 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 9 remaining) [2023-08-26 18:56:38,224 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-08-26 18:56:38,422 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-08-26 18:56:38,423 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2023-08-26 18:56:38,423 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:56:38,425 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 213 places, 254 transitions, 538 flow [2023-08-26 18:56:38,454 INFO L124 PetriNetUnfolderBase]: 93/540 cut-off events. [2023-08-26 18:56:38,454 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:56:38,457 INFO L83 FinitePrefix]: Finished finitePrefix Result has 568 conditions, 540 events. 93/540 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2277 event pairs, 1 based on Foata normal form. 0/412 useless extension candidates. Maximal degree in co-relation 368. Up to 16 conditions per place. [2023-08-26 18:56:38,457 INFO L82 GeneralOperation]: Start removeDead. Operand has 213 places, 254 transitions, 538 flow [2023-08-26 18:56:38,459 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 213 places, 254 transitions, 538 flow [2023-08-26 18:56:38,459 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:56:38,459 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 213 places, 254 transitions, 538 flow [2023-08-26 18:56:38,459 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 213 places, 254 transitions, 538 flow [2023-08-26 18:56:38,459 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 213 places, 254 transitions, 538 flow [2023-08-26 18:56:38,488 INFO L124 PetriNetUnfolderBase]: 93/540 cut-off events. [2023-08-26 18:56:38,489 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:56:38,492 INFO L83 FinitePrefix]: Finished finitePrefix Result has 568 conditions, 540 events. 93/540 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2277 event pairs, 1 based on Foata normal form. 0/412 useless extension candidates. Maximal degree in co-relation 368. Up to 16 conditions per place. [2023-08-26 18:56:38,499 INFO L119 LiptonReduction]: Number of co-enabled transitions 37338 [2023-08-26 18:56:40,637 INFO L134 LiptonReduction]: Checked pairs total: 109911 [2023-08-26 18:56:40,637 INFO L136 LiptonReduction]: Total number of compositions: 188 [2023-08-26 18:56:40,638 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:56:40,639 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;@46136f12, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:56:40,639 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:56:40,646 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:56:40,646 INFO L124 PetriNetUnfolderBase]: 55/198 cut-off events. [2023-08-26 18:56:40,646 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 18:56:40,646 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:56:40,646 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 18:56:40,646 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:56:40,647 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:56:40,647 INFO L85 PathProgramCache]: Analyzing trace with hash -1473016367, now seen corresponding path program 1 times [2023-08-26 18:56:40,647 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:56:40,647 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409564619] [2023-08-26 18:56:40,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:56:40,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:56:40,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:56:40,673 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:56:40,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:56:40,681 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:56:40,681 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:56:40,681 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:56:40,681 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-08-26 18:56:40,682 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:56:40,682 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:56:40,682 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:56:40,682 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 18:56:40,711 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 18:56:40,713 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 254 places, 305 transitions, 654 flow [2023-08-26 18:56:40,774 INFO L124 PetriNetUnfolderBase]: 136/796 cut-off events. [2023-08-26 18:56:40,774 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:56:40,782 INFO L83 FinitePrefix]: Finished finitePrefix Result has 851 conditions, 796 events. 136/796 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 3622 event pairs, 6 based on Foata normal form. 0/609 useless extension candidates. Maximal degree in co-relation 560. Up to 32 conditions per place. [2023-08-26 18:56:40,782 INFO L82 GeneralOperation]: Start removeDead. Operand has 254 places, 305 transitions, 654 flow [2023-08-26 18:56:40,789 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 254 places, 305 transitions, 654 flow [2023-08-26 18:56:40,789 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:56:40,789 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 254 places, 305 transitions, 654 flow [2023-08-26 18:56:40,789 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 254 places, 305 transitions, 654 flow [2023-08-26 18:56:40,789 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 254 places, 305 transitions, 654 flow [2023-08-26 18:56:40,938 INFO L124 PetriNetUnfolderBase]: 136/796 cut-off events. [2023-08-26 18:56:40,938 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:56:40,944 INFO L83 FinitePrefix]: Finished finitePrefix Result has 851 conditions, 796 events. 136/796 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 3622 event pairs, 6 based on Foata normal form. 0/609 useless extension candidates. Maximal degree in co-relation 560. Up to 32 conditions per place. [2023-08-26 18:56:40,961 INFO L119 LiptonReduction]: Number of co-enabled transitions 59976 [2023-08-26 18:56:43,382 INFO L134 LiptonReduction]: Checked pairs total: 201735 [2023-08-26 18:56:43,382 INFO L136 LiptonReduction]: Total number of compositions: 226 [2023-08-26 18:56:43,383 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:56:43,384 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;@46136f12, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:56:43,384 INFO L358 AbstractCegarLoop]: Starting to check reachability of 10 error locations. [2023-08-26 18:56:43,384 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:56:43,384 INFO L124 PetriNetUnfolderBase]: 0/3 cut-off events. [2023-08-26 18:56:43,384 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:56:43,385 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:56:43,385 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:56:43,385 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-08-26 18:56:43,385 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:56:43,385 INFO L85 PathProgramCache]: Analyzing trace with hash 81293, now seen corresponding path program 1 times [2023-08-26 18:56:43,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:56:43,385 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468550671] [2023-08-26 18:56:43,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:56:43,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:56:43,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:56:43,421 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 18:56:43,422 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:56:43,422 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468550671] [2023-08-26 18:56:43,422 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468550671] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:56:43,423 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:56:43,423 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:56:43,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192891207] [2023-08-26 18:56:43,423 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:56:43,423 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:56:43,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:56:43,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:56:43,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:56:43,424 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 220 out of 531 [2023-08-26 18:56:43,424 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 120 places, 165 transitions, 374 flow. Second operand has 3 states, 3 states have (on average 220.66666666666666) internal successors, (662), 3 states have internal predecessors, (662), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:56:43,424 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:56:43,424 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 220 of 531 [2023-08-26 18:56:43,425 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand