/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_20-callback_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 18:49:08,999 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 18:49:09,081 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 18:49:09,085 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 18:49:09,085 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 18:49:09,116 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 18:49:09,117 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 18:49:09,117 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 18:49:09,118 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 18:49:09,121 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 18:49:09,122 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 18:49:09,122 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 18:49:09,122 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 18:49:09,123 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 18:49:09,123 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 18:49:09,124 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 18:49:09,124 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 18:49:09,124 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 18:49:09,124 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 18:49:09,125 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 18:49:09,125 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 18:49:09,126 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 18:49:09,126 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 18:49:09,126 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 18:49:09,126 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 18:49:09,127 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 18:49:09,127 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 18:49:09,127 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:49:09,127 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 18:49:09,128 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 18:49:09,128 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 18:49:09,129 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 18:49:09,129 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 18:49:09,129 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 18:49:09,129 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 18:49:09,129 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 18:49:09,405 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 18:49:09,421 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 18:49:09,423 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 18:49:09,423 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 18:49:09,428 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 18:49:09,430 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_20-callback_racefree.i [2023-08-26 18:49:10,495 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 18:49:10,745 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 18:49:10,746 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_20-callback_racefree.i [2023-08-26 18:49:10,763 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/87100fe8e/e4149362221444ef8a9f1ca47b955aac/FLAG89073540a [2023-08-26 18:49:10,775 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/87100fe8e/e4149362221444ef8a9f1ca47b955aac [2023-08-26 18:49:10,779 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 18:49:10,780 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 18:49:10,782 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 18:49:10,783 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 18:49:10,785 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 18:49:10,785 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:49:10" (1/1) ... [2023-08-26 18:49:10,786 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64005e92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:10, skipping insertion in model container [2023-08-26 18:49:10,786 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:49:10" (1/1) ... [2023-08-26 18:49:10,830 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 18:49:11,124 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:49:11,140 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 18:49:11,169 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [245] [2023-08-26 18:49:11,170 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [245] [2023-08-26 18:49:11,204 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:49:11,240 WARN L669 CHandler]: The function callback is called, but not defined or handled by StandardFunctionHandler. [2023-08-26 18:49:11,245 INFO L206 MainTranslator]: Completed translation [2023-08-26 18:49:11,246 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11 WrapperNode [2023-08-26 18:49:11,246 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 18:49:11,247 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 18:49:11,247 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 18:49:11,247 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 18:49:11,253 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11" (1/1) ... [2023-08-26 18:49:11,280 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11" (1/1) ... [2023-08-26 18:49:11,309 INFO L138 Inliner]: procedures = 173, calls = 34, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 141 [2023-08-26 18:49:11,310 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 18:49:11,311 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 18:49:11,311 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 18:49:11,311 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 18:49:11,319 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11" (1/1) ... [2023-08-26 18:49:11,319 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11" (1/1) ... [2023-08-26 18:49:11,337 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11" (1/1) ... [2023-08-26 18:49:11,337 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11" (1/1) ... [2023-08-26 18:49:11,342 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11" (1/1) ... [2023-08-26 18:49:11,345 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11" (1/1) ... [2023-08-26 18:49:11,347 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11" (1/1) ... [2023-08-26 18:49:11,348 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11" (1/1) ... [2023-08-26 18:49:11,362 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 18:49:11,363 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 18:49:11,363 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 18:49:11,363 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 18:49:11,364 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11" (1/1) ... [2023-08-26 18:49:11,368 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:49:11,387 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:49:11,398 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 18:49:11,418 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 18:49:11,431 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 18:49:11,431 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 18:49:11,431 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 18:49:11,431 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 18:49:11,431 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 18:49:11,431 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 18:49:11,432 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 18:49:11,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 18:49:11,432 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 18:49:11,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 18:49:11,432 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 18:49:11,433 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 18:49:11,548 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 18:49:11,549 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 18:49:11,781 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 18:49:11,788 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 18:49:11,788 INFO L302 CfgBuilder]: Removed 11 assume(true) statements. [2023-08-26 18:49:11,790 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:49:11 BoogieIcfgContainer [2023-08-26 18:49:11,790 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 18:49:11,792 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 18:49:11,792 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 18:49:11,795 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 18:49:11,795 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 06:49:10" (1/3) ... [2023-08-26 18:49:11,796 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79837447 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:49:11, skipping insertion in model container [2023-08-26 18:49:11,796 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:11" (2/3) ... [2023-08-26 18:49:11,796 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79837447 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:49:11, skipping insertion in model container [2023-08-26 18:49:11,796 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:49:11" (3/3) ... [2023-08-26 18:49:11,800 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_20-callback_racefree.i [2023-08-26 18:49:11,817 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 18:49:11,818 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-08-26 18:49:11,818 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 18:49:11,874 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 18:49:11,913 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 135 places, 148 transitions, 304 flow [2023-08-26 18:49:12,012 INFO L124 PetriNetUnfolderBase]: 27/225 cut-off events. [2023-08-26 18:49:12,012 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:49:12,018 INFO L83 FinitePrefix]: Finished finitePrefix Result has 231 conditions, 225 events. 27/225 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 634 event pairs, 0 based on Foata normal form. 0/186 useless extension candidates. Maximal degree in co-relation 112. Up to 6 conditions per place. [2023-08-26 18:49:12,018 INFO L82 GeneralOperation]: Start removeDead. Operand has 135 places, 148 transitions, 304 flow [2023-08-26 18:49:12,027 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 135 places, 148 transitions, 304 flow [2023-08-26 18:49:12,031 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:12,045 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 135 places, 148 transitions, 304 flow [2023-08-26 18:49:12,048 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 135 places, 148 transitions, 304 flow [2023-08-26 18:49:12,049 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 135 places, 148 transitions, 304 flow [2023-08-26 18:49:12,102 INFO L124 PetriNetUnfolderBase]: 27/225 cut-off events. [2023-08-26 18:49:12,102 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:49:12,105 INFO L83 FinitePrefix]: Finished finitePrefix Result has 231 conditions, 225 events. 27/225 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 634 event pairs, 0 based on Foata normal form. 0/186 useless extension candidates. Maximal degree in co-relation 112. Up to 6 conditions per place. [2023-08-26 18:49:12,107 INFO L119 LiptonReduction]: Number of co-enabled transitions 3984 [2023-08-26 18:49:15,563 INFO L134 LiptonReduction]: Checked pairs total: 5928 [2023-08-26 18:49:15,563 INFO L136 LiptonReduction]: Total number of compositions: 132 [2023-08-26 18:49:15,574 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:49:15,579 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;@66b4a6f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:15,579 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 18:49:15,582 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:15,582 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:49:15,582 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:15,582 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:15,583 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:15,583 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 18:49:15,586 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:15,587 INFO L85 PathProgramCache]: Analyzing trace with hash 17742, now seen corresponding path program 1 times [2023-08-26 18:49:15,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:15,594 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356313732] [2023-08-26 18:49:15,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:15,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:15,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:15,892 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 18:49:15,893 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:15,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356313732] [2023-08-26 18:49:15,894 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [356313732] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:15,894 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:15,894 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:15,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506976750] [2023-08-26 18:49:15,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:15,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:15,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:15,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:15,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:15,931 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 112 out of 280 [2023-08-26 18:49:15,935 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 32 places, 41 transitions, 90 flow. Second operand has 3 states, 3 states have (on average 112.66666666666667) internal successors, (338), 3 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:15,935 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:15,935 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 112 of 280 [2023-08-26 18:49:15,936 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:16,035 INFO L124 PetriNetUnfolderBase]: 116/266 cut-off events. [2023-08-26 18:49:16,035 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:49:16,038 INFO L83 FinitePrefix]: Finished finitePrefix Result has 530 conditions, 266 events. 116/266 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 33. Compared 1341 event pairs, 0 based on Foata normal form. 43/213 useless extension candidates. Maximal degree in co-relation 490. Up to 242 conditions per place. [2023-08-26 18:49:16,041 INFO L140 encePairwiseOnDemand]: 267/280 looper letters, 35 selfloop transitions, 2 changer transitions 0/40 dead transitions. [2023-08-26 18:49:16,041 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 34 places, 40 transitions, 162 flow [2023-08-26 18:49:16,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:16,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:16,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 387 transitions. [2023-08-26 18:49:16,060 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4607142857142857 [2023-08-26 18:49:16,061 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 387 transitions. [2023-08-26 18:49:16,061 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 387 transitions. [2023-08-26 18:49:16,064 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:16,066 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 387 transitions. [2023-08-26 18:49:16,071 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 129.0) internal successors, (387), 3 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,075 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 280.0) internal successors, (1120), 4 states have internal predecessors, (1120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,076 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 280.0) internal successors, (1120), 4 states have internal predecessors, (1120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,078 INFO L175 Difference]: Start difference. First operand has 32 places, 41 transitions, 90 flow. Second operand 3 states and 387 transitions. [2023-08-26 18:49:16,078 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 34 places, 40 transitions, 162 flow [2023-08-26 18:49:16,081 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 34 places, 40 transitions, 162 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:49:16,083 INFO L231 Difference]: Finished difference. Result has 35 places, 32 transitions, 82 flow [2023-08-26 18:49:16,084 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=280, PETRI_DIFFERENCE_MINUEND_FLOW=72, PETRI_DIFFERENCE_MINUEND_PLACES=32, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=32, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=30, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=82, PETRI_PLACES=35, PETRI_TRANSITIONS=32} [2023-08-26 18:49:16,088 INFO L281 CegarLoopForPetriNet]: 32 programPoint places, 3 predicate places. [2023-08-26 18:49:16,089 INFO L495 AbstractCegarLoop]: Abstraction has has 35 places, 32 transitions, 82 flow [2023-08-26 18:49:16,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 112.66666666666667) internal successors, (338), 3 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,089 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:16,089 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:16,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 18:49:16,090 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 18:49:16,097 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:16,098 INFO L85 PathProgramCache]: Analyzing trace with hash 17741, now seen corresponding path program 1 times [2023-08-26 18:49:16,098 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:16,098 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420600087] [2023-08-26 18:49:16,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:16,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:16,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:16,146 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 18:49:16,147 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:16,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420600087] [2023-08-26 18:49:16,147 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420600087] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:16,147 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:16,147 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:16,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044967626] [2023-08-26 18:49:16,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:16,148 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:16,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:16,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:16,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:16,150 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 117 out of 280 [2023-08-26 18:49:16,150 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 35 places, 32 transitions, 82 flow. Second operand has 3 states, 3 states have (on average 117.66666666666667) internal successors, (353), 3 states have internal predecessors, (353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,150 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:16,151 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 117 of 280 [2023-08-26 18:49:16,151 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:16,205 INFO L124 PetriNetUnfolderBase]: 104/234 cut-off events. [2023-08-26 18:49:16,205 INFO L125 PetriNetUnfolderBase]: For 9/9 co-relation queries the response was YES. [2023-08-26 18:49:16,206 INFO L83 FinitePrefix]: Finished finitePrefix Result has 499 conditions, 234 events. 104/234 cut-off events. For 9/9 co-relation queries the response was YES. Maximal size of possible extension queue 25. Compared 1048 event pairs, 84 based on Foata normal form. 0/163 useless extension candidates. Maximal degree in co-relation 464. Up to 209 conditions per place. [2023-08-26 18:49:16,207 INFO L140 encePairwiseOnDemand]: 276/280 looper letters, 27 selfloop transitions, 2 changer transitions 4/36 dead transitions. [2023-08-26 18:49:16,207 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 35 places, 36 transitions, 156 flow [2023-08-26 18:49:16,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:16,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:16,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 386 transitions. [2023-08-26 18:49:16,208 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4595238095238095 [2023-08-26 18:49:16,209 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 386 transitions. [2023-08-26 18:49:16,209 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 386 transitions. [2023-08-26 18:49:16,209 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:16,209 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 386 transitions. [2023-08-26 18:49:16,210 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 128.66666666666666) internal successors, (386), 3 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,212 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 280.0) internal successors, (1120), 4 states have internal predecessors, (1120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,213 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 280.0) internal successors, (1120), 4 states have internal predecessors, (1120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,213 INFO L175 Difference]: Start difference. First operand has 35 places, 32 transitions, 82 flow. Second operand 3 states and 386 transitions. [2023-08-26 18:49:16,213 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 35 places, 36 transitions, 156 flow [2023-08-26 18:49:16,214 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 36 transitions, 152 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:49:16,214 INFO L231 Difference]: Finished difference. Result has 33 places, 30 transitions, 78 flow [2023-08-26 18:49:16,215 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=280, PETRI_DIFFERENCE_MINUEND_FLOW=74, PETRI_DIFFERENCE_MINUEND_PLACES=31, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=28, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=78, PETRI_PLACES=33, PETRI_TRANSITIONS=30} [2023-08-26 18:49:16,215 INFO L281 CegarLoopForPetriNet]: 32 programPoint places, 1 predicate places. [2023-08-26 18:49:16,216 INFO L495 AbstractCegarLoop]: Abstraction has has 33 places, 30 transitions, 78 flow [2023-08-26 18:49:16,216 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 117.66666666666667) internal successors, (353), 3 states have internal predecessors, (353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,216 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:16,216 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 18:49:16,216 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 18:49:16,217 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 18:49:16,217 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:16,217 INFO L85 PathProgramCache]: Analyzing trace with hash 528884872, now seen corresponding path program 1 times [2023-08-26 18:49:16,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:16,218 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1813927145] [2023-08-26 18:49:16,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:16,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:16,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:16,324 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 18:49:16,324 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:16,325 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1813927145] [2023-08-26 18:49:16,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1813927145] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:49:16,329 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054120457] [2023-08-26 18:49:16,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:16,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:49:16,330 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:49:16,333 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 18:49:16,364 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 18:49:16,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:16,413 INFO L262 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:49:16,416 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:49:16,475 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 18:49:16,521 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 18:49:16,522 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:49:16,561 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 18:49:16,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2054120457] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:49:16,562 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:49:16,562 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-08-26 18:49:16,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615386392] [2023-08-26 18:49:16,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:49:16,562 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 18:49:16,563 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:16,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 18:49:16,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-08-26 18:49:16,564 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 112 out of 280 [2023-08-26 18:49:16,565 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 33 places, 30 transitions, 78 flow. Second operand has 7 states, 7 states have (on average 113.71428571428571) internal successors, (796), 7 states have internal predecessors, (796), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,566 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:16,566 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 112 of 280 [2023-08-26 18:49:16,566 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:16,607 INFO L124 PetriNetUnfolderBase]: 12/43 cut-off events. [2023-08-26 18:49:16,607 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:16,608 INFO L83 FinitePrefix]: Finished finitePrefix Result has 100 conditions, 43 events. 12/43 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 131 event pairs, 0 based on Foata normal form. 7/44 useless extension candidates. Maximal degree in co-relation 92. Up to 26 conditions per place. [2023-08-26 18:49:16,608 INFO L140 encePairwiseOnDemand]: 276/280 looper letters, 7 selfloop transitions, 2 changer transitions 8/19 dead transitions. [2023-08-26 18:49:16,608 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 21 places, 19 transitions, 81 flow [2023-08-26 18:49:16,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:49:16,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:49:16,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 467 transitions. [2023-08-26 18:49:16,626 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.41696428571428573 [2023-08-26 18:49:16,626 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 467 transitions. [2023-08-26 18:49:16,626 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 467 transitions. [2023-08-26 18:49:16,626 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:16,626 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 467 transitions. [2023-08-26 18:49:16,628 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 116.75) internal successors, (467), 4 states have internal predecessors, (467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,629 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 280.0) internal successors, (1400), 5 states have internal predecessors, (1400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,630 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 280.0) internal successors, (1400), 5 states have internal predecessors, (1400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,630 INFO L175 Difference]: Start difference. First operand has 33 places, 30 transitions, 78 flow. Second operand 4 states and 467 transitions. [2023-08-26 18:49:16,630 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 21 places, 19 transitions, 81 flow [2023-08-26 18:49:16,631 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 19 places, 19 transitions, 78 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:49:16,631 INFO L231 Difference]: Finished difference. Result has 19 places, 8 transitions, 26 flow [2023-08-26 18:49:16,631 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=280, PETRI_DIFFERENCE_MINUEND_FLOW=30, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=12, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=10, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=26, PETRI_PLACES=19, PETRI_TRANSITIONS=8} [2023-08-26 18:49:16,632 INFO L281 CegarLoopForPetriNet]: 32 programPoint places, -13 predicate places. [2023-08-26 18:49:16,632 INFO L495 AbstractCegarLoop]: Abstraction has has 19 places, 8 transitions, 26 flow [2023-08-26 18:49:16,633 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 113.71428571428571) internal successors, (796), 7 states have internal predecessors, (796), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,633 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:16,633 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:49:16,642 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 18:49:16,839 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 18:49:16,840 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t_funErr0ASSERT_VIOLATIONASSERT === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 18:49:16,840 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:16,840 INFO L85 PathProgramCache]: Analyzing trace with hash -784444700, now seen corresponding path program 1 times [2023-08-26 18:49:16,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:16,841 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163944893] [2023-08-26 18:49:16,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:16,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:16,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:16,901 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 18:49:16,901 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:16,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163944893] [2023-08-26 18:49:16,902 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163944893] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:16,902 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:16,902 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:16,902 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242853205] [2023-08-26 18:49:16,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:16,903 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:16,903 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:16,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:16,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:16,906 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 126 out of 280 [2023-08-26 18:49:16,906 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 19 places, 8 transitions, 26 flow. Second operand has 3 states, 3 states have (on average 127.66666666666667) internal successors, (383), 3 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,906 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:16,906 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 126 of 280 [2023-08-26 18:49:16,906 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:16,917 INFO L124 PetriNetUnfolderBase]: 2/14 cut-off events. [2023-08-26 18:49:16,917 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:49:16,918 INFO L83 FinitePrefix]: Finished finitePrefix Result has 35 conditions, 14 events. 2/14 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 18 event pairs, 2 based on Foata normal form. 3/17 useless extension candidates. Maximal degree in co-relation 27. Up to 10 conditions per place. [2023-08-26 18:49:16,918 INFO L140 encePairwiseOnDemand]: 278/280 looper letters, 0 selfloop transitions, 0 changer transitions 7/7 dead transitions. [2023-08-26 18:49:16,918 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 16 places, 7 transitions, 34 flow [2023-08-26 18:49:16,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:16,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:16,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 384 transitions. [2023-08-26 18:49:16,920 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45714285714285713 [2023-08-26 18:49:16,920 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 384 transitions. [2023-08-26 18:49:16,920 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 384 transitions. [2023-08-26 18:49:16,920 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:16,920 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 384 transitions. [2023-08-26 18:49:16,921 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 128.0) internal successors, (384), 3 states have internal predecessors, (384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,923 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 280.0) internal successors, (1120), 4 states have internal predecessors, (1120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,923 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 280.0) internal successors, (1120), 4 states have internal predecessors, (1120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,923 INFO L175 Difference]: Start difference. First operand has 19 places, 8 transitions, 26 flow. Second operand 3 states and 384 transitions. [2023-08-26 18:49:16,923 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 16 places, 7 transitions, 34 flow [2023-08-26 18:49:16,924 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 14 places, 7 transitions, 31 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:49:16,924 INFO L231 Difference]: Finished difference. Result has 14 places, 0 transitions, 0 flow [2023-08-26 18:49:16,924 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=280, PETRI_DIFFERENCE_MINUEND_FLOW=21, PETRI_DIFFERENCE_MINUEND_PLACES=12, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=7, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=7, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=14, PETRI_TRANSITIONS=0} [2023-08-26 18:49:16,926 INFO L281 CegarLoopForPetriNet]: 32 programPoint places, -18 predicate places. [2023-08-26 18:49:16,926 INFO L495 AbstractCegarLoop]: Abstraction has has 14 places, 0 transitions, 0 flow [2023-08-26 18:49:16,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 127.66666666666667) internal successors, (383), 3 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:16,929 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (5 of 6 remaining) [2023-08-26 18:49:16,929 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 6 remaining) [2023-08-26 18:49:16,929 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 6 remaining) [2023-08-26 18:49:16,929 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (2 of 6 remaining) [2023-08-26 18:49:16,929 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 6 remaining) [2023-08-26 18:49:16,930 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 6 remaining) [2023-08-26 18:49:16,930 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 18:49:16,930 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 18:49:16,932 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:49:16,942 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 135 places, 148 transitions, 304 flow [2023-08-26 18:49:16,962 INFO L124 PetriNetUnfolderBase]: 27/225 cut-off events. [2023-08-26 18:49:16,962 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:49:16,962 INFO L83 FinitePrefix]: Finished finitePrefix Result has 231 conditions, 225 events. 27/225 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 634 event pairs, 0 based on Foata normal form. 0/186 useless extension candidates. Maximal degree in co-relation 112. Up to 6 conditions per place. [2023-08-26 18:49:16,963 INFO L82 GeneralOperation]: Start removeDead. Operand has 135 places, 148 transitions, 304 flow [2023-08-26 18:49:16,964 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 131 places, 143 transitions, 291 flow [2023-08-26 18:49:16,965 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:16,965 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 131 places, 143 transitions, 291 flow [2023-08-26 18:49:16,970 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 131 places, 143 transitions, 291 flow [2023-08-26 18:49:16,970 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 143 transitions, 291 flow [2023-08-26 18:49:16,987 INFO L124 PetriNetUnfolderBase]: 26/220 cut-off events. [2023-08-26 18:49:16,988 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:16,988 INFO L83 FinitePrefix]: Finished finitePrefix Result has 225 conditions, 220 events. 26/220 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 590 event pairs, 0 based on Foata normal form. 0/181 useless extension candidates. Maximal degree in co-relation 112. Up to 6 conditions per place. [2023-08-26 18:49:16,990 INFO L119 LiptonReduction]: Number of co-enabled transitions 3984 [2023-08-26 18:49:20,036 INFO L134 LiptonReduction]: Checked pairs total: 5433 [2023-08-26 18:49:20,037 INFO L136 LiptonReduction]: Total number of compositions: 139 [2023-08-26 18:49:20,038 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:49:20,039 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;@66b4a6f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:20,039 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:49:20,042 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:20,042 INFO L124 PetriNetUnfolderBase]: 6/31 cut-off events. [2023-08-26 18:49:20,043 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:20,043 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:20,043 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 18:49:20,043 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:49:20,043 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:20,043 INFO L85 PathProgramCache]: Analyzing trace with hash -975128499, now seen corresponding path program 1 times [2023-08-26 18:49:20,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:20,044 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2147095419] [2023-08-26 18:49:20,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:20,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:20,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:49:20,056 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:49:20,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:49:20,075 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:49:20,075 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:49:20,075 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:49:20,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 18:49:20,075 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:49:20,076 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:49:20,076 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:49:20,076 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 18:49:20,090 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 18:49:20,092 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 174 transitions, 366 flow [2023-08-26 18:49:20,117 INFO L124 PetriNetUnfolderBase]: 45/355 cut-off events. [2023-08-26 18:49:20,118 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:49:20,120 INFO L83 FinitePrefix]: Finished finitePrefix Result has 369 conditions, 355 events. 45/355 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 1297 event pairs, 0 based on Foata normal form. 0/290 useless extension candidates. Maximal degree in co-relation 227. Up to 9 conditions per place. [2023-08-26 18:49:20,121 INFO L82 GeneralOperation]: Start removeDead. Operand has 158 places, 174 transitions, 366 flow [2023-08-26 18:49:20,122 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 158 places, 174 transitions, 366 flow [2023-08-26 18:49:20,122 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:20,123 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 158 places, 174 transitions, 366 flow [2023-08-26 18:49:20,123 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 158 places, 174 transitions, 366 flow [2023-08-26 18:49:20,123 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 174 transitions, 366 flow [2023-08-26 18:49:20,150 INFO L124 PetriNetUnfolderBase]: 45/355 cut-off events. [2023-08-26 18:49:20,150 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:49:20,151 INFO L83 FinitePrefix]: Finished finitePrefix Result has 369 conditions, 355 events. 45/355 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 1297 event pairs, 0 based on Foata normal form. 0/290 useless extension candidates. Maximal degree in co-relation 227. Up to 9 conditions per place. [2023-08-26 18:49:20,157 INFO L119 LiptonReduction]: Number of co-enabled transitions 9648 [2023-08-26 18:49:23,292 INFO L134 LiptonReduction]: Checked pairs total: 14943 [2023-08-26 18:49:23,292 INFO L136 LiptonReduction]: Total number of compositions: 158 [2023-08-26 18:49:23,294 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:49:23,295 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;@66b4a6f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:23,295 INFO L358 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2023-08-26 18:49:23,296 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:23,296 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:49:23,296 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:23,296 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:23,296 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:23,297 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2023-08-26 18:49:23,301 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:23,301 INFO L85 PathProgramCache]: Analyzing trace with hash 33647, now seen corresponding path program 1 times [2023-08-26 18:49:23,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:23,302 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871286730] [2023-08-26 18:49:23,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:23,302 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:23,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:23,339 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 18:49:23,340 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:23,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871286730] [2023-08-26 18:49:23,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1871286730] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:23,341 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:23,341 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:23,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578758478] [2023-08-26 18:49:23,341 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:23,341 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:23,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:23,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:23,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:23,345 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 136 out of 332 [2023-08-26 18:49:23,346 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 43 places, 53 transitions, 124 flow. Second operand has 3 states, 3 states have (on average 136.66666666666666) internal successors, (410), 3 states have internal predecessors, (410), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:23,346 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:23,346 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 136 of 332 [2023-08-26 18:49:23,346 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:23,588 INFO L124 PetriNetUnfolderBase]: 1786/2906 cut-off events. [2023-08-26 18:49:23,589 INFO L125 PetriNetUnfolderBase]: For 55/55 co-relation queries the response was YES. [2023-08-26 18:49:23,592 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5834 conditions, 2906 events. 1786/2906 cut-off events. For 55/55 co-relation queries the response was YES. Maximal size of possible extension queue 127. Compared 14974 event pairs, 1536 based on Foata normal form. 194/2304 useless extension candidates. Maximal degree in co-relation 1884. Up to 2687 conditions per place. [2023-08-26 18:49:23,603 INFO L140 encePairwiseOnDemand]: 317/332 looper letters, 47 selfloop transitions, 2 changer transitions 0/53 dead transitions. [2023-08-26 18:49:23,603 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 43 places, 53 transitions, 222 flow [2023-08-26 18:49:23,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:23,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:23,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 475 transitions. [2023-08-26 18:49:23,605 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47690763052208834 [2023-08-26 18:49:23,605 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 475 transitions. [2023-08-26 18:49:23,605 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 475 transitions. [2023-08-26 18:49:23,605 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:23,605 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 475 transitions. [2023-08-26 18:49:23,606 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 158.33333333333334) internal successors, (475), 3 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:23,608 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 332.0) internal successors, (1328), 4 states have internal predecessors, (1328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:23,609 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 332.0) internal successors, (1328), 4 states have internal predecessors, (1328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:23,609 INFO L175 Difference]: Start difference. First operand has 43 places, 53 transitions, 124 flow. Second operand 3 states and 475 transitions. [2023-08-26 18:49:23,609 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 43 places, 53 transitions, 222 flow [2023-08-26 18:49:23,612 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 53 transitions, 222 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:49:23,613 INFO L231 Difference]: Finished difference. Result has 43 places, 40 transitions, 102 flow [2023-08-26 18:49:23,614 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=332, PETRI_DIFFERENCE_MINUEND_FLOW=98, PETRI_DIFFERENCE_MINUEND_PLACES=41, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=38, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=102, PETRI_PLACES=43, PETRI_TRANSITIONS=40} [2023-08-26 18:49:23,615 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, 0 predicate places. [2023-08-26 18:49:23,615 INFO L495 AbstractCegarLoop]: Abstraction has has 43 places, 40 transitions, 102 flow [2023-08-26 18:49:23,616 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 136.66666666666666) internal successors, (410), 3 states have internal predecessors, (410), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:23,616 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:23,616 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:23,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 18:49:23,616 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2023-08-26 18:49:23,617 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:23,617 INFO L85 PathProgramCache]: Analyzing trace with hash 33648, now seen corresponding path program 1 times [2023-08-26 18:49:23,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:23,619 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516890210] [2023-08-26 18:49:23,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:23,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:23,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:23,688 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 18:49:23,688 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:23,690 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516890210] [2023-08-26 18:49:23,690 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1516890210] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:23,690 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:23,691 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:23,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451853186] [2023-08-26 18:49:23,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:23,692 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:23,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:23,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:23,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:23,693 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 131 out of 332 [2023-08-26 18:49:23,694 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 43 places, 40 transitions, 102 flow. Second operand has 3 states, 3 states have (on average 131.66666666666666) internal successors, (395), 3 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:23,694 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:23,694 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 131 of 332 [2023-08-26 18:49:23,694 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:23,952 INFO L124 PetriNetUnfolderBase]: 1783/2906 cut-off events. [2023-08-26 18:49:23,952 INFO L125 PetriNetUnfolderBase]: For 91/91 co-relation queries the response was YES. [2023-08-26 18:49:23,955 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5900 conditions, 2906 events. 1783/2906 cut-off events. For 91/91 co-relation queries the response was YES. Maximal size of possible extension queue 128. Compared 14914 event pairs, 750 based on Foata normal form. 0/2179 useless extension candidates. Maximal degree in co-relation 5456. Up to 2848 conditions per place. [2023-08-26 18:49:23,967 INFO L140 encePairwiseOnDemand]: 328/332 looper letters, 43 selfloop transitions, 2 changer transitions 0/49 dead transitions. [2023-08-26 18:49:23,967 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 49 transitions, 210 flow [2023-08-26 18:49:23,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:23,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:23,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 440 transitions. [2023-08-26 18:49:23,968 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44176706827309237 [2023-08-26 18:49:23,969 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 440 transitions. [2023-08-26 18:49:23,969 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 440 transitions. [2023-08-26 18:49:23,969 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:23,969 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 440 transitions. [2023-08-26 18:49:23,970 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 146.66666666666666) internal successors, (440), 3 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:23,972 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 332.0) internal successors, (1328), 4 states have internal predecessors, (1328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:23,972 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 332.0) internal successors, (1328), 4 states have internal predecessors, (1328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:23,972 INFO L175 Difference]: Start difference. First operand has 43 places, 40 transitions, 102 flow. Second operand 3 states and 440 transitions. [2023-08-26 18:49:23,972 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 49 transitions, 210 flow [2023-08-26 18:49:23,974 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 49 transitions, 206 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:49:23,975 INFO L231 Difference]: Finished difference. Result has 44 places, 41 transitions, 112 flow [2023-08-26 18:49:23,975 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=332, PETRI_DIFFERENCE_MINUEND_FLOW=98, PETRI_DIFFERENCE_MINUEND_PLACES=41, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=38, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=112, PETRI_PLACES=44, PETRI_TRANSITIONS=41} [2023-08-26 18:49:23,975 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, 1 predicate places. [2023-08-26 18:49:23,975 INFO L495 AbstractCegarLoop]: Abstraction has has 44 places, 41 transitions, 112 flow [2023-08-26 18:49:23,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 131.66666666666666) internal successors, (395), 3 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:23,976 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:23,976 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:49:23,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-26 18:49:23,976 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2023-08-26 18:49:23,977 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:23,977 INFO L85 PathProgramCache]: Analyzing trace with hash 1034374195, now seen corresponding path program 1 times [2023-08-26 18:49:23,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:23,977 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77918302] [2023-08-26 18:49:23,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:23,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:23,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:24,048 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 18:49:24,048 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:24,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77918302] [2023-08-26 18:49:24,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77918302] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:49:24,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1028005400] [2023-08-26 18:49:24,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:24,049 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:49:24,049 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:49:24,050 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 18:49:24,057 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 18:49:24,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:24,115 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:49:24,116 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:49:24,134 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 18:49:24,179 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 18:49:24,179 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:49:24,214 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 18:49:24,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1028005400] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:49:24,214 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:49:24,214 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:49:24,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441106559] [2023-08-26 18:49:24,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:49:24,215 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:49:24,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:24,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:49:24,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:49:24,216 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 131 out of 332 [2023-08-26 18:49:24,217 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 41 transitions, 112 flow. Second operand has 8 states, 8 states have (on average 132.875) internal successors, (1063), 8 states have internal predecessors, (1063), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,217 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:24,217 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 131 of 332 [2023-08-26 18:49:24,218 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:24,353 INFO L124 PetriNetUnfolderBase]: 257/516 cut-off events. [2023-08-26 18:49:24,353 INFO L125 PetriNetUnfolderBase]: For 128/128 co-relation queries the response was YES. [2023-08-26 18:49:24,354 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1184 conditions, 516 events. 257/516 cut-off events. For 128/128 co-relation queries the response was YES. Maximal size of possible extension queue 41. Compared 2383 event pairs, 0 based on Foata normal form. 64/508 useless extension candidates. Maximal degree in co-relation 238. Up to 306 conditions per place. [2023-08-26 18:49:24,355 INFO L140 encePairwiseOnDemand]: 328/332 looper letters, 38 selfloop transitions, 3 changer transitions 0/43 dead transitions. [2023-08-26 18:49:24,356 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 32 places, 43 transitions, 188 flow [2023-08-26 18:49:24,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 18:49:24,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 18:49:24,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 700 transitions. [2023-08-26 18:49:24,358 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42168674698795183 [2023-08-26 18:49:24,358 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 700 transitions. [2023-08-26 18:49:24,358 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 700 transitions. [2023-08-26 18:49:24,359 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:24,359 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 700 transitions. [2023-08-26 18:49:24,360 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 140.0) internal successors, (700), 5 states have internal predecessors, (700), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,362 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 332.0) internal successors, (1992), 6 states have internal predecessors, (1992), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,363 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 332.0) internal successors, (1992), 6 states have internal predecessors, (1992), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,363 INFO L175 Difference]: Start difference. First operand has 44 places, 41 transitions, 112 flow. Second operand 5 states and 700 transitions. [2023-08-26 18:49:24,363 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 32 places, 43 transitions, 188 flow [2023-08-26 18:49:24,364 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 31 places, 43 transitions, 184 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-26 18:49:24,364 INFO L231 Difference]: Finished difference. Result has 31 places, 21 transitions, 64 flow [2023-08-26 18:49:24,365 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=332, PETRI_DIFFERENCE_MINUEND_FLOW=58, PETRI_DIFFERENCE_MINUEND_PLACES=27, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=21, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=18, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=64, PETRI_PLACES=31, PETRI_TRANSITIONS=21} [2023-08-26 18:49:24,365 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, -12 predicate places. [2023-08-26 18:49:24,365 INFO L495 AbstractCegarLoop]: Abstraction has has 31 places, 21 transitions, 64 flow [2023-08-26 18:49:24,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 132.875) internal successors, (1063), 8 states have internal predecessors, (1063), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,366 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:24,366 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:49:24,374 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-26 18:49:24,571 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 18:49:24,572 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t_funErr0ASSERT_VIOLATIONASSERT === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2023-08-26 18:49:24,572 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:24,572 INFO L85 PathProgramCache]: Analyzing trace with hash 1034604707, now seen corresponding path program 1 times [2023-08-26 18:49:24,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:24,572 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841973881] [2023-08-26 18:49:24,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:24,573 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:24,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:24,611 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 18:49:24,611 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:24,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [841973881] [2023-08-26 18:49:24,611 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [841973881] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:24,612 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:24,612 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:24,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357911775] [2023-08-26 18:49:24,612 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:24,612 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:24,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:24,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:24,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:24,613 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 144 out of 332 [2023-08-26 18:49:24,614 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 31 places, 21 transitions, 64 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 18:49:24,614 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:24,614 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 144 of 332 [2023-08-26 18:49:24,614 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:24,650 INFO L124 PetriNetUnfolderBase]: 160/297 cut-off events. [2023-08-26 18:49:24,650 INFO L125 PetriNetUnfolderBase]: For 142/142 co-relation queries the response was YES. [2023-08-26 18:49:24,651 INFO L83 FinitePrefix]: Finished finitePrefix Result has 701 conditions, 297 events. 160/297 cut-off events. For 142/142 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 1088 event pairs, 160 based on Foata normal form. 0/297 useless extension candidates. Maximal degree in co-relation 273. Up to 288 conditions per place. [2023-08-26 18:49:24,651 INFO L140 encePairwiseOnDemand]: 328/332 looper letters, 0 selfloop transitions, 0 changer transitions 18/18 dead transitions. [2023-08-26 18:49:24,651 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 30 places, 18 transitions, 90 flow [2023-08-26 18:49:24,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:24,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:24,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 450 transitions. [2023-08-26 18:49:24,653 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45180722891566266 [2023-08-26 18:49:24,653 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 450 transitions. [2023-08-26 18:49:24,653 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 450 transitions. [2023-08-26 18:49:24,653 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:24,653 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 450 transitions. [2023-08-26 18:49:24,654 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 150.0) internal successors, (450), 3 states have internal predecessors, (450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,656 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 332.0) internal successors, (1328), 4 states have internal predecessors, (1328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,656 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 332.0) internal successors, (1328), 4 states have internal predecessors, (1328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,656 INFO L175 Difference]: Start difference. First operand has 31 places, 21 transitions, 64 flow. Second operand 3 states and 450 transitions. [2023-08-26 18:49:24,656 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 30 places, 18 transitions, 90 flow [2023-08-26 18:49:24,657 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 18 transitions, 83 flow, removed 1 selfloop flow, removed 3 redundant places. [2023-08-26 18:49:24,657 INFO L231 Difference]: Finished difference. Result has 27 places, 0 transitions, 0 flow [2023-08-26 18:49:24,658 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=332, PETRI_DIFFERENCE_MINUEND_FLOW=51, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=18, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=18, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=27, PETRI_TRANSITIONS=0} [2023-08-26 18:49:24,659 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, -16 predicate places. [2023-08-26 18:49:24,659 INFO L495 AbstractCegarLoop]: Abstraction has has 27 places, 0 transitions, 0 flow [2023-08-26 18:49:24,660 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 18:49:24,661 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (6 of 7 remaining) [2023-08-26 18:49:24,661 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 7 remaining) [2023-08-26 18:49:24,661 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 7 remaining) [2023-08-26 18:49:24,664 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (3 of 7 remaining) [2023-08-26 18:49:24,664 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (2 of 7 remaining) [2023-08-26 18:49:24,664 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 7 remaining) [2023-08-26 18:49:24,664 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 7 remaining) [2023-08-26 18:49:24,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 18:49:24,664 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 18:49:24,665 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:49:24,667 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 174 transitions, 366 flow [2023-08-26 18:49:24,689 INFO L124 PetriNetUnfolderBase]: 45/355 cut-off events. [2023-08-26 18:49:24,689 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:49:24,690 INFO L83 FinitePrefix]: Finished finitePrefix Result has 369 conditions, 355 events. 45/355 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 1297 event pairs, 0 based on Foata normal form. 0/290 useless extension candidates. Maximal degree in co-relation 227. Up to 9 conditions per place. [2023-08-26 18:49:24,690 INFO L82 GeneralOperation]: Start removeDead. Operand has 158 places, 174 transitions, 366 flow [2023-08-26 18:49:24,692 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 158 places, 174 transitions, 366 flow [2023-08-26 18:49:24,692 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:24,692 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 158 places, 174 transitions, 366 flow [2023-08-26 18:49:24,692 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 158 places, 174 transitions, 366 flow [2023-08-26 18:49:24,692 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 174 transitions, 366 flow [2023-08-26 18:49:24,716 INFO L124 PetriNetUnfolderBase]: 45/355 cut-off events. [2023-08-26 18:49:24,716 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:49:24,718 INFO L83 FinitePrefix]: Finished finitePrefix Result has 369 conditions, 355 events. 45/355 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 1297 event pairs, 0 based on Foata normal form. 0/290 useless extension candidates. Maximal degree in co-relation 227. Up to 9 conditions per place. [2023-08-26 18:49:24,723 INFO L119 LiptonReduction]: Number of co-enabled transitions 9648 [2023-08-26 18:49:27,597 INFO L134 LiptonReduction]: Checked pairs total: 15663 [2023-08-26 18:49:27,597 INFO L136 LiptonReduction]: Total number of compositions: 158 [2023-08-26 18:49:27,599 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:49:27,599 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;@66b4a6f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:27,599 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:49:27,604 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:27,604 INFO L124 PetriNetUnfolderBase]: 20/77 cut-off events. [2023-08-26 18:49:27,605 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 18:49:27,605 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:27,605 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 18:49:27,605 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:49:27,605 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:27,605 INFO L85 PathProgramCache]: Analyzing trace with hash 1204449375, now seen corresponding path program 1 times [2023-08-26 18:49:27,605 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:27,605 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244795507] [2023-08-26 18:49:27,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:27,606 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:27,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:49:27,619 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:49:27,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:49:27,630 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:49:27,630 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:49:27,630 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:49:27,630 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 18:49:27,630 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:49:27,631 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:49:27,631 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:49:27,631 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 18:49:27,645 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 18:49:27,647 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 200 transitions, 430 flow [2023-08-26 18:49:27,686 INFO L124 PetriNetUnfolderBase]: 68/522 cut-off events. [2023-08-26 18:49:27,686 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:49:27,689 INFO L83 FinitePrefix]: Finished finitePrefix Result has 550 conditions, 522 events. 68/522 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2148 event pairs, 1 based on Foata normal form. 0/423 useless extension candidates. Maximal degree in co-relation 363. Up to 16 conditions per place. [2023-08-26 18:49:27,689 INFO L82 GeneralOperation]: Start removeDead. Operand has 181 places, 200 transitions, 430 flow [2023-08-26 18:49:27,693 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 181 places, 200 transitions, 430 flow [2023-08-26 18:49:27,693 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:27,693 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 181 places, 200 transitions, 430 flow [2023-08-26 18:49:27,693 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 181 places, 200 transitions, 430 flow [2023-08-26 18:49:27,693 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 200 transitions, 430 flow [2023-08-26 18:49:27,731 INFO L124 PetriNetUnfolderBase]: 68/522 cut-off events. [2023-08-26 18:49:27,731 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:49:27,734 INFO L83 FinitePrefix]: Finished finitePrefix Result has 550 conditions, 522 events. 68/522 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2148 event pairs, 1 based on Foata normal form. 0/423 useless extension candidates. Maximal degree in co-relation 363. Up to 16 conditions per place. [2023-08-26 18:49:27,745 INFO L119 LiptonReduction]: Number of co-enabled transitions 16416 [2023-08-26 18:49:30,594 INFO L134 LiptonReduction]: Checked pairs total: 26302 [2023-08-26 18:49:30,594 INFO L136 LiptonReduction]: Total number of compositions: 184 [2023-08-26 18:49:30,596 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:49:30,596 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;@66b4a6f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:30,596 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-08-26 18:49:30,597 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:30,597 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:49:30,597 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:30,597 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:30,597 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:30,597 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:49:30,598 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:30,598 INFO L85 PathProgramCache]: Analyzing trace with hash 51816, now seen corresponding path program 1 times [2023-08-26 18:49:30,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:30,598 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027123937] [2023-08-26 18:49:30,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:30,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:30,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:30,642 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 18:49:30,642 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:30,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027123937] [2023-08-26 18:49:30,643 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027123937] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:30,643 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:30,643 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:30,643 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365526037] [2023-08-26 18:49:30,643 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:30,643 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:30,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:30,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:30,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:30,644 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 150 out of 384 [2023-08-26 18:49:30,645 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 67 transitions, 164 flow. Second operand has 3 states, 3 states have (on average 150.66666666666666) internal successors, (452), 3 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:30,645 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:30,645 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 150 of 384 [2023-08-26 18:49:30,645 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:32,590 INFO L124 PetriNetUnfolderBase]: 18616/26542 cut-off events. [2023-08-26 18:49:32,590 INFO L125 PetriNetUnfolderBase]: For 715/715 co-relation queries the response was YES. [2023-08-26 18:49:32,627 INFO L83 FinitePrefix]: Finished finitePrefix Result has 53315 conditions, 26542 events. 18616/26542 cut-off events. For 715/715 co-relation queries the response was YES. Maximal size of possible extension queue 959. Compared 161409 event pairs, 11750 based on Foata normal form. 2432/21593 useless extension candidates. Maximal degree in co-relation 6480. Up to 26291 conditions per place. [2023-08-26 18:49:32,805 INFO L140 encePairwiseOnDemand]: 365/384 looper letters, 51 selfloop transitions, 2 changer transitions 0/58 dead transitions. [2023-08-26 18:49:32,805 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 54 places, 58 transitions, 252 flow [2023-08-26 18:49:32,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:32,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:32,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 523 transitions. [2023-08-26 18:49:32,807 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4539930555555556 [2023-08-26 18:49:32,807 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 523 transitions. [2023-08-26 18:49:32,807 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 523 transitions. [2023-08-26 18:49:32,808 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:32,808 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 523 transitions. [2023-08-26 18:49:32,809 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 174.33333333333334) internal successors, (523), 3 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,810 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 384.0) internal successors, (1536), 4 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,811 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 384.0) internal successors, (1536), 4 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,811 INFO L175 Difference]: Start difference. First operand has 54 places, 67 transitions, 164 flow. Second operand 3 states and 523 transitions. [2023-08-26 18:49:32,811 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 54 places, 58 transitions, 252 flow [2023-08-26 18:49:32,813 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 58 transitions, 252 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:49:32,814 INFO L231 Difference]: Finished difference. Result has 55 places, 51 transitions, 144 flow [2023-08-26 18:49:32,814 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=384, PETRI_DIFFERENCE_MINUEND_FLOW=130, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=50, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=48, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=144, PETRI_PLACES=55, PETRI_TRANSITIONS=51} [2023-08-26 18:49:32,815 INFO L281 CegarLoopForPetriNet]: 54 programPoint places, 1 predicate places. [2023-08-26 18:49:32,815 INFO L495 AbstractCegarLoop]: Abstraction has has 55 places, 51 transitions, 144 flow [2023-08-26 18:49:32,815 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 150.66666666666666) internal successors, (452), 3 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,815 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:32,816 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:32,816 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-08-26 18:49:32,816 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:49:32,816 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:32,816 INFO L85 PathProgramCache]: Analyzing trace with hash 51815, now seen corresponding path program 1 times [2023-08-26 18:49:32,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:32,816 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656986193] [2023-08-26 18:49:32,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:32,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:32,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:32,843 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 18:49:32,843 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:32,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656986193] [2023-08-26 18:49:32,844 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656986193] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:32,844 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:32,844 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:32,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646009430] [2023-08-26 18:49:32,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:32,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:32,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:32,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:32,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:32,845 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 155 out of 384 [2023-08-26 18:49:32,846 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 55 places, 51 transitions, 144 flow. Second operand has 3 states, 3 states have (on average 155.66666666666666) internal successors, (467), 3 states have internal predecessors, (467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,846 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:32,846 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 155 of 384 [2023-08-26 18:49:32,846 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:34,489 INFO L124 PetriNetUnfolderBase]: 16548/23604 cut-off events. [2023-08-26 18:49:34,489 INFO L125 PetriNetUnfolderBase]: For 1458/1458 co-relation queries the response was YES. [2023-08-26 18:49:34,514 INFO L83 FinitePrefix]: Finished finitePrefix Result has 48581 conditions, 23604 events. 16548/23604 cut-off events. For 1458/1458 co-relation queries the response was YES. Maximal size of possible extension queue 834. Compared 142606 event pairs, 14587 based on Foata normal form. 0/17958 useless extension candidates. Maximal degree in co-relation 48529. Up to 21708 conditions per place. [2023-08-26 18:49:34,677 INFO L140 encePairwiseOnDemand]: 380/384 looper letters, 60 selfloop transitions, 2 changer transitions 0/67 dead transitions. [2023-08-26 18:49:34,677 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 67 transitions, 300 flow [2023-08-26 18:49:34,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:34,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:34,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 528 transitions. [2023-08-26 18:49:34,680 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4583333333333333 [2023-08-26 18:49:34,680 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 528 transitions. [2023-08-26 18:49:34,680 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 528 transitions. [2023-08-26 18:49:34,680 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:34,680 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 528 transitions. [2023-08-26 18:49:34,681 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 176.0) internal successors, (528), 3 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,683 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 384.0) internal successors, (1536), 4 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,684 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 384.0) internal successors, (1536), 4 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,684 INFO L175 Difference]: Start difference. First operand has 55 places, 51 transitions, 144 flow. Second operand 3 states and 528 transitions. [2023-08-26 18:49:34,684 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 67 transitions, 300 flow [2023-08-26 18:49:34,686 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 67 transitions, 298 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:49:34,688 INFO L231 Difference]: Finished difference. Result has 54 places, 49 transitions, 142 flow [2023-08-26 18:49:34,689 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=384, PETRI_DIFFERENCE_MINUEND_FLOW=138, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=49, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=47, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=142, PETRI_PLACES=54, PETRI_TRANSITIONS=49} [2023-08-26 18:49:34,690 INFO L281 CegarLoopForPetriNet]: 54 programPoint places, 0 predicate places. [2023-08-26 18:49:34,690 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 49 transitions, 142 flow [2023-08-26 18:49:34,690 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 155.66666666666666) internal successors, (467), 3 states have internal predecessors, (467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,690 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:34,690 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:49:34,690 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 18:49:34,690 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting t_funErr0ASSERT_VIOLATIONASSERT === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:49:34,691 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:34,691 INFO L85 PathProgramCache]: Analyzing trace with hash 649923910, now seen corresponding path program 1 times [2023-08-26 18:49:34,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:34,691 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124991791] [2023-08-26 18:49:34,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:34,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:34,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:34,742 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 18:49:34,742 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:34,742 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124991791] [2023-08-26 18:49:34,742 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124991791] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:34,742 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:34,742 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:34,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766199454] [2023-08-26 18:49:34,743 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:34,743 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:34,743 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:34,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:34,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:34,744 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 162 out of 384 [2023-08-26 18:49:34,744 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 49 transitions, 142 flow. Second operand has 3 states, 3 states have (on average 163.66666666666666) internal successors, (491), 3 states have internal predecessors, (491), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,745 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:34,745 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 162 of 384 [2023-08-26 18:49:34,745 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:36,386 INFO L124 PetriNetUnfolderBase]: 19167/27823 cut-off events. [2023-08-26 18:49:36,386 INFO L125 PetriNetUnfolderBase]: For 1467/1467 co-relation queries the response was YES. [2023-08-26 18:49:36,419 INFO L83 FinitePrefix]: Finished finitePrefix Result has 57016 conditions, 27823 events. 19167/27823 cut-off events. For 1467/1467 co-relation queries the response was YES. Maximal size of possible extension queue 708. Compared 168452 event pairs, 8444 based on Foata normal form. 0/22936 useless extension candidates. Maximal degree in co-relation 51119. Up to 18219 conditions per place. [2023-08-26 18:49:36,498 INFO L140 encePairwiseOnDemand]: 378/384 looper letters, 67 selfloop transitions, 2 changer transitions 2/75 dead transitions. [2023-08-26 18:49:36,499 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 56 places, 75 transitions, 345 flow [2023-08-26 18:49:36,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:36,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:36,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 559 transitions. [2023-08-26 18:49:36,501 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4852430555555556 [2023-08-26 18:49:36,501 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 559 transitions. [2023-08-26 18:49:36,501 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 559 transitions. [2023-08-26 18:49:36,502 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:36,502 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 559 transitions. [2023-08-26 18:49:36,505 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 186.33333333333334) internal successors, (559), 3 states have internal predecessors, (559), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:36,508 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 384.0) internal successors, (1536), 4 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:36,509 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 384.0) internal successors, (1536), 4 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:36,509 INFO L175 Difference]: Start difference. First operand has 54 places, 49 transitions, 142 flow. Second operand 3 states and 559 transitions. [2023-08-26 18:49:36,509 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 56 places, 75 transitions, 345 flow [2023-08-26 18:49:36,581 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 75 transitions, 339 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:49:36,582 INFO L231 Difference]: Finished difference. Result has 55 places, 49 transitions, 148 flow [2023-08-26 18:49:36,582 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=384, PETRI_DIFFERENCE_MINUEND_FLOW=138, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=49, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=47, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=148, PETRI_PLACES=55, PETRI_TRANSITIONS=49} [2023-08-26 18:49:36,582 INFO L281 CegarLoopForPetriNet]: 54 programPoint places, 1 predicate places. [2023-08-26 18:49:36,582 INFO L495 AbstractCegarLoop]: Abstraction has has 55 places, 49 transitions, 148 flow [2023-08-26 18:49:36,583 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 163.66666666666666) internal successors, (491), 3 states have internal predecessors, (491), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:36,583 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:36,583 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:49:36,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 18:49:36,583 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:49:36,583 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:36,583 INFO L85 PathProgramCache]: Analyzing trace with hash 649635351, now seen corresponding path program 1 times [2023-08-26 18:49:36,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:36,583 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926182689] [2023-08-26 18:49:36,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:36,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:36,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:36,663 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 18:49:36,663 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:36,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926182689] [2023-08-26 18:49:36,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926182689] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:49:36,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781515618] [2023-08-26 18:49:36,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:36,663 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:49:36,664 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:49:36,665 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 18:49:36,667 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 18:49:36,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:36,741 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:49:36,742 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:49:36,750 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 18:49:36,780 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 18:49:36,780 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:49:36,814 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 18:49:36,814 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [781515618] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:49:36,815 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:49:36,815 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-08-26 18:49:36,817 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662651395] [2023-08-26 18:49:36,817 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:49:36,817 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 18:49:36,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:36,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 18:49:36,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-08-26 18:49:36,820 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 150 out of 384 [2023-08-26 18:49:36,821 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 55 places, 49 transitions, 148 flow. Second operand has 7 states, 7 states have (on average 151.71428571428572) internal successors, (1062), 7 states have internal predecessors, (1062), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:36,821 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:36,821 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 150 of 384 [2023-08-26 18:49:36,821 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:38,372 INFO L124 PetriNetUnfolderBase]: 18591/27161 cut-off events. [2023-08-26 18:49:38,372 INFO L125 PetriNetUnfolderBase]: For 2271/2271 co-relation queries the response was YES. [2023-08-26 18:49:38,398 INFO L83 FinitePrefix]: Finished finitePrefix Result has 57876 conditions, 27161 events. 18591/27161 cut-off events. For 2271/2271 co-relation queries the response was YES. Maximal size of possible extension queue 703. Compared 169789 event pairs, 2503 based on Foata normal form. 5/23819 useless extension candidates. Maximal degree in co-relation 17560. Up to 24408 conditions per place. [2023-08-26 18:49:38,475 INFO L140 encePairwiseOnDemand]: 380/384 looper letters, 83 selfloop transitions, 6 changer transitions 1/94 dead transitions. [2023-08-26 18:49:38,475 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 94 transitions, 420 flow [2023-08-26 18:49:38,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:49:38,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:49:38,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 993 transitions. [2023-08-26 18:49:38,483 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4309895833333333 [2023-08-26 18:49:38,483 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 993 transitions. [2023-08-26 18:49:38,483 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 993 transitions. [2023-08-26 18:49:38,484 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:38,484 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 993 transitions. [2023-08-26 18:49:38,487 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 165.5) internal successors, (993), 6 states have internal predecessors, (993), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:38,493 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 384.0) internal successors, (2688), 7 states have internal predecessors, (2688), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:38,493 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 384.0) internal successors, (2688), 7 states have internal predecessors, (2688), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:38,494 INFO L175 Difference]: Start difference. First operand has 55 places, 49 transitions, 148 flow. Second operand 6 states and 993 transitions. [2023-08-26 18:49:38,494 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 94 transitions, 420 flow [2023-08-26 18:49:38,499 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 56 places, 94 transitions, 416 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:49:38,500 INFO L231 Difference]: Finished difference. Result has 56 places, 50 transitions, 160 flow [2023-08-26 18:49:38,500 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=384, PETRI_DIFFERENCE_MINUEND_FLOW=140, PETRI_DIFFERENCE_MINUEND_PLACES=51, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=48, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=44, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=160, PETRI_PLACES=56, PETRI_TRANSITIONS=50} [2023-08-26 18:49:38,501 INFO L281 CegarLoopForPetriNet]: 54 programPoint places, 2 predicate places. [2023-08-26 18:49:38,501 INFO L495 AbstractCegarLoop]: Abstraction has has 56 places, 50 transitions, 160 flow [2023-08-26 18:49:38,501 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 151.71428571428572) internal successors, (1062), 7 states have internal predecessors, (1062), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:38,501 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:38,502 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 18:49:38,512 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 18:49:38,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:49:38,713 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:49:38,713 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:38,713 INFO L85 PathProgramCache]: Analyzing trace with hash 2087152221, now seen corresponding path program 1 times [2023-08-26 18:49:38,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:38,713 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163325455] [2023-08-26 18:49:38,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:38,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:38,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:38,738 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 18:49:38,738 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:38,738 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163325455] [2023-08-26 18:49:38,738 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163325455] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:38,738 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:38,738 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 18:49:38,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500603698] [2023-08-26 18:49:38,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:38,739 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:38,739 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:38,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:38,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:38,740 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 163 out of 384 [2023-08-26 18:49:38,741 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 56 places, 50 transitions, 160 flow. Second operand has 3 states, 3 states have (on average 165.66666666666666) internal successors, (497), 3 states have internal predecessors, (497), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:38,741 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:38,741 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 163 of 384 [2023-08-26 18:49:38,741 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:41,000 INFO L124 PetriNetUnfolderBase]: 24945/36120 cut-off events. [2023-08-26 18:49:41,000 INFO L125 PetriNetUnfolderBase]: For 4270/4270 co-relation queries the response was YES. [2023-08-26 18:49:41,037 INFO L83 FinitePrefix]: Finished finitePrefix Result has 77110 conditions, 36120 events. 24945/36120 cut-off events. For 4270/4270 co-relation queries the response was YES. Maximal size of possible extension queue 1032. Compared 230229 event pairs, 16714 based on Foata normal form. 0/32353 useless extension candidates. Maximal degree in co-relation 22278. Up to 26745 conditions per place. [2023-08-26 18:49:41,137 INFO L140 encePairwiseOnDemand]: 380/384 looper letters, 69 selfloop transitions, 4 changer transitions 0/77 dead transitions. [2023-08-26 18:49:41,137 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 77 transitions, 370 flow [2023-08-26 18:49:41,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:41,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:41,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 559 transitions. [2023-08-26 18:49:41,139 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4852430555555556 [2023-08-26 18:49:41,139 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 559 transitions. [2023-08-26 18:49:41,139 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 559 transitions. [2023-08-26 18:49:41,140 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:41,140 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 559 transitions. [2023-08-26 18:49:41,141 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 186.33333333333334) internal successors, (559), 3 states have internal predecessors, (559), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:41,143 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 384.0) internal successors, (1536), 4 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:41,143 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 384.0) internal successors, (1536), 4 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:41,143 INFO L175 Difference]: Start difference. First operand has 56 places, 50 transitions, 160 flow. Second operand 3 states and 559 transitions. [2023-08-26 18:49:41,144 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 77 transitions, 370 flow [2023-08-26 18:49:41,146 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 55 places, 77 transitions, 355 flow, removed 4 selfloop flow, removed 3 redundant places. [2023-08-26 18:49:41,149 INFO L231 Difference]: Finished difference. Result has 56 places, 52 transitions, 167 flow [2023-08-26 18:49:41,150 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=384, PETRI_DIFFERENCE_MINUEND_FLOW=145, PETRI_DIFFERENCE_MINUEND_PLACES=53, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=50, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=46, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=167, PETRI_PLACES=56, PETRI_TRANSITIONS=52} [2023-08-26 18:49:41,151 INFO L281 CegarLoopForPetriNet]: 54 programPoint places, 2 predicate places. [2023-08-26 18:49:41,151 INFO L495 AbstractCegarLoop]: Abstraction has has 56 places, 52 transitions, 167 flow [2023-08-26 18:49:41,151 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 165.66666666666666) internal successors, (497), 3 states have internal predecessors, (497), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:41,151 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:41,151 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:49:41,152 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-26 18:49:41,152 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 18:49:41,152 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:41,152 INFO L85 PathProgramCache]: Analyzing trace with hash 277245278, now seen corresponding path program 1 times [2023-08-26 18:49:41,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:41,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057271168] [2023-08-26 18:49:41,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:41,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:41,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:41,196 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 18:49:41,196 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:41,196 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057271168] [2023-08-26 18:49:41,196 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2057271168] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:49:41,196 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005861099] [2023-08-26 18:49:41,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:41,196 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:49:41,197 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:49:41,198 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 18:49:41,224 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 18:49:41,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:41,275 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:49:41,276 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:49:41,304 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-08-26 18:49:41,304 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:49:41,336 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-08-26 18:49:41,336 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1005861099] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:49:41,336 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:49:41,336 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 10 [2023-08-26 18:49:41,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038264122] [2023-08-26 18:49:41,337 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:49:41,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-08-26 18:49:41,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:41,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-08-26 18:49:41,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-08-26 18:49:41,339 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 154 out of 384 [2023-08-26 18:49:41,340 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 56 places, 52 transitions, 167 flow. Second operand has 10 states, 10 states have (on average 156.7) internal successors, (1567), 10 states have internal predecessors, (1567), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:41,340 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:41,340 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 154 of 384 [2023-08-26 18:49:41,341 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:41,499 INFO L124 PetriNetUnfolderBase]: 1312/1996 cut-off events. [2023-08-26 18:49:41,499 INFO L125 PetriNetUnfolderBase]: For 520/520 co-relation queries the response was YES. [2023-08-26 18:49:41,501 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4287 conditions, 1996 events. 1312/1996 cut-off events. For 520/520 co-relation queries the response was YES. Maximal size of possible extension queue 99. Compared 9062 event pairs, 0 based on Foata normal form. 210/2205 useless extension candidates. Maximal degree in co-relation 4279. Up to 1248 conditions per place. [2023-08-26 18:49:41,502 INFO L140 encePairwiseOnDemand]: 381/384 looper letters, 0 selfloop transitions, 0 changer transitions 54/54 dead transitions. [2023-08-26 18:49:41,502 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 41 places, 54 transitions, 235 flow [2023-08-26 18:49:41,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:49:41,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:49:41,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 978 transitions. [2023-08-26 18:49:41,504 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4244791666666667 [2023-08-26 18:49:41,505 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 978 transitions. [2023-08-26 18:49:41,505 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 978 transitions. [2023-08-26 18:49:41,505 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:41,505 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 978 transitions. [2023-08-26 18:49:41,507 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 163.0) internal successors, (978), 6 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:41,510 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 384.0) internal successors, (2688), 7 states have internal predecessors, (2688), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:41,511 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 384.0) internal successors, (2688), 7 states have internal predecessors, (2688), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:41,511 INFO L175 Difference]: Start difference. First operand has 56 places, 52 transitions, 167 flow. Second operand 6 states and 978 transitions. [2023-08-26 18:49:41,511 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 41 places, 54 transitions, 235 flow [2023-08-26 18:49:41,512 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 40 places, 54 transitions, 232 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-26 18:49:41,512 INFO L231 Difference]: Finished difference. Result has 40 places, 0 transitions, 0 flow [2023-08-26 18:49:41,512 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=384, PETRI_DIFFERENCE_MINUEND_FLOW=68, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=24, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=40, PETRI_TRANSITIONS=0} [2023-08-26 18:49:41,512 INFO L281 CegarLoopForPetriNet]: 54 programPoint places, -14 predicate places. [2023-08-26 18:49:41,513 INFO L495 AbstractCegarLoop]: Abstraction has has 40 places, 0 transitions, 0 flow [2023-08-26 18:49:41,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 156.7) internal successors, (1567), 10 states have internal predecessors, (1567), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:41,513 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (7 of 8 remaining) [2023-08-26 18:49:41,513 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 8 remaining) [2023-08-26 18:49:41,514 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 8 remaining) [2023-08-26 18:49:41,514 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (4 of 8 remaining) [2023-08-26 18:49:41,514 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (3 of 8 remaining) [2023-08-26 18:49:41,514 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (2 of 8 remaining) [2023-08-26 18:49:41,514 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 8 remaining) [2023-08-26 18:49:41,514 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 8 remaining) [2023-08-26 18:49:41,522 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-08-26 18:49:41,719 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 18:49:41,719 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2023-08-26 18:49:41,719 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:49:41,721 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 200 transitions, 430 flow [2023-08-26 18:49:41,765 INFO L124 PetriNetUnfolderBase]: 68/522 cut-off events. [2023-08-26 18:49:41,765 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:49:41,768 INFO L83 FinitePrefix]: Finished finitePrefix Result has 550 conditions, 522 events. 68/522 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2148 event pairs, 1 based on Foata normal form. 0/423 useless extension candidates. Maximal degree in co-relation 363. Up to 16 conditions per place. [2023-08-26 18:49:41,768 INFO L82 GeneralOperation]: Start removeDead. Operand has 181 places, 200 transitions, 430 flow [2023-08-26 18:49:41,769 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 181 places, 200 transitions, 430 flow [2023-08-26 18:49:41,770 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:41,770 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 181 places, 200 transitions, 430 flow [2023-08-26 18:49:41,770 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 181 places, 200 transitions, 430 flow [2023-08-26 18:49:41,770 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 200 transitions, 430 flow [2023-08-26 18:49:41,808 INFO L124 PetriNetUnfolderBase]: 68/522 cut-off events. [2023-08-26 18:49:41,809 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:49:41,811 INFO L83 FinitePrefix]: Finished finitePrefix Result has 550 conditions, 522 events. 68/522 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2148 event pairs, 1 based on Foata normal form. 0/423 useless extension candidates. Maximal degree in co-relation 363. Up to 16 conditions per place. [2023-08-26 18:49:41,817 INFO L119 LiptonReduction]: Number of co-enabled transitions 16416 [2023-08-26 18:49:44,949 INFO L134 LiptonReduction]: Checked pairs total: 27874 [2023-08-26 18:49:44,950 INFO L136 LiptonReduction]: Total number of compositions: 189 [2023-08-26 18:49:44,951 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:49:44,951 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;@66b4a6f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:44,951 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:49:44,960 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:44,960 INFO L124 PetriNetUnfolderBase]: 34/123 cut-off events. [2023-08-26 18:49:44,960 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 18:49:44,960 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:44,960 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 18:49:44,960 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:49:44,961 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:44,961 INFO L85 PathProgramCache]: Analyzing trace with hash 1525585245, now seen corresponding path program 1 times [2023-08-26 18:49:44,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:44,961 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345748762] [2023-08-26 18:49:44,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:44,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:44,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:49:44,973 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:49:44,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:49:44,984 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:49:44,985 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:49:44,985 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:49:44,985 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-26 18:49:44,985 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:49:44,985 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:49:44,986 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:49:44,986 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 18:49:45,009 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 18:49:45,011 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 204 places, 226 transitions, 496 flow [2023-08-26 18:49:45,092 INFO L124 PetriNetUnfolderBase]: 103/765 cut-off events. [2023-08-26 18:49:45,092 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:49:45,100 INFO L83 FinitePrefix]: Finished finitePrefix Result has 820 conditions, 765 events. 103/765 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 3477 event pairs, 6 based on Foata normal form. 0/616 useless extension candidates. Maximal degree in co-relation 542. Up to 32 conditions per place. [2023-08-26 18:49:45,101 INFO L82 GeneralOperation]: Start removeDead. Operand has 204 places, 226 transitions, 496 flow [2023-08-26 18:49:45,108 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 204 places, 226 transitions, 496 flow [2023-08-26 18:49:45,108 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:45,109 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 204 places, 226 transitions, 496 flow [2023-08-26 18:49:45,109 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 204 places, 226 transitions, 496 flow [2023-08-26 18:49:45,109 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 204 places, 226 transitions, 496 flow [2023-08-26 18:49:45,190 INFO L124 PetriNetUnfolderBase]: 103/765 cut-off events. [2023-08-26 18:49:45,191 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:49:45,197 INFO L83 FinitePrefix]: Finished finitePrefix Result has 820 conditions, 765 events. 103/765 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 3477 event pairs, 6 based on Foata normal form. 0/616 useless extension candidates. Maximal degree in co-relation 542. Up to 32 conditions per place. [2023-08-26 18:49:45,212 INFO L119 LiptonReduction]: Number of co-enabled transitions 24480 [2023-08-26 18:49:48,413 INFO L134 LiptonReduction]: Checked pairs total: 46697 [2023-08-26 18:49:48,414 INFO L136 LiptonReduction]: Total number of compositions: 205 [2023-08-26 18:49:48,415 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:49:48,415 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;@66b4a6f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:48,416 INFO L358 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2023-08-26 18:49:48,417 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:48,417 INFO L124 PetriNetUnfolderBase]: 1/3 cut-off events. [2023-08-26 18:49:48,417 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:48,417 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:48,417 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:48,417 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-08-26 18:49:48,417 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:48,417 INFO L85 PathProgramCache]: Analyzing trace with hash 72491, now seen corresponding path program 1 times [2023-08-26 18:49:48,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:48,418 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892405284] [2023-08-26 18:49:48,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:48,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:48,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:48,438 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 18:49:48,438 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:48,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892405284] [2023-08-26 18:49:48,438 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892405284] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:48,438 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:48,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:48,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116726550] [2023-08-26 18:49:48,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:48,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:48,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:48,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:48,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:48,441 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 174 out of 431 [2023-08-26 18:49:48,442 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 66 places, 83 transitions, 210 flow. Second operand has 3 states, 3 states have (on average 174.66666666666666) internal successors, (524), 3 states have internal predecessors, (524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:48,442 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:48,442 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 174 of 431 [2023-08-26 18:49:48,442 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:50:01,577 INFO L124 PetriNetUnfolderBase]: 164355/224297 cut-off events. [2023-08-26 18:50:01,577 INFO L125 PetriNetUnfolderBase]: For 9666/9666 co-relation queries the response was YES. [2023-08-26 18:50:01,896 INFO L83 FinitePrefix]: Finished finitePrefix Result has 444792 conditions, 224297 events. 164355/224297 cut-off events. For 9666/9666 co-relation queries the response was YES. Maximal size of possible extension queue 8109. Compared 1694324 event pairs, 146202 based on Foata normal form. 50774/201645 useless extension candidates. Maximal degree in co-relation 49987. Up to 199090 conditions per place. [2023-08-26 18:50:02,718 INFO L140 encePairwiseOnDemand]: 407/431 looper letters, 73 selfloop transitions, 2 changer transitions 0/83 dead transitions. [2023-08-26 18:50:02,718 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 64 places, 83 transitions, 360 flow [2023-08-26 18:50:02,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:50:02,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:50:02,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 633 transitions. [2023-08-26 18:50:02,720 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4895591647331787 [2023-08-26 18:50:02,720 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 633 transitions. [2023-08-26 18:50:02,720 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 633 transitions. [2023-08-26 18:50:02,721 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:50:02,721 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 633 transitions. [2023-08-26 18:50:02,722 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 211.0) internal successors, (633), 3 states have internal predecessors, (633), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:02,724 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 431.0) internal successors, (1724), 4 states have internal predecessors, (1724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:02,724 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 431.0) internal successors, (1724), 4 states have internal predecessors, (1724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:02,725 INFO L175 Difference]: Start difference. First operand has 66 places, 83 transitions, 210 flow. Second operand 3 states and 633 transitions. [2023-08-26 18:50:02,725 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 64 places, 83 transitions, 360 flow [2023-08-26 18:50:02,728 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 64 places, 83 transitions, 360 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:50:02,728 INFO L231 Difference]: Finished difference. Result has 64 places, 59 transitions, 166 flow [2023-08-26 18:50:02,729 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=431, PETRI_DIFFERENCE_MINUEND_FLOW=162, PETRI_DIFFERENCE_MINUEND_PLACES=62, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=166, PETRI_PLACES=64, PETRI_TRANSITIONS=59} [2023-08-26 18:50:02,729 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, -2 predicate places. [2023-08-26 18:50:02,729 INFO L495 AbstractCegarLoop]: Abstraction has has 64 places, 59 transitions, 166 flow [2023-08-26 18:50:02,729 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 174.66666666666666) internal successors, (524), 3 states have internal predecessors, (524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:02,730 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:02,730 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:50:02,730 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-08-26 18:50:02,730 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-08-26 18:50:02,730 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:02,730 INFO L85 PathProgramCache]: Analyzing trace with hash 72492, now seen corresponding path program 1 times [2023-08-26 18:50:02,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:02,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611631592] [2023-08-26 18:50:02,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:02,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:02,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:02,764 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:50:02,764 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:50:02,764 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611631592] [2023-08-26 18:50:02,764 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611631592] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:50:02,764 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:50:02,764 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:50:02,765 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843136374] [2023-08-26 18:50:02,765 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:50:02,765 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:50:02,765 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:50:02,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:50:02,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:50:02,766 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 169 out of 431 [2023-08-26 18:50:02,767 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 59 transitions, 166 flow. Second operand has 3 states, 3 states have (on average 169.66666666666666) internal successors, (509), 3 states have internal predecessors, (509), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:02,767 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:50:02,767 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 169 of 431 [2023-08-26 18:50:02,767 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:50:15,305 INFO L124 PetriNetUnfolderBase]: 164352/224475 cut-off events. [2023-08-26 18:50:15,305 INFO L125 PetriNetUnfolderBase]: For 12391/12391 co-relation queries the response was YES. [2023-08-26 18:50:15,651 INFO L83 FinitePrefix]: Finished finitePrefix Result has 448992 conditions, 224475 events. 164352/224475 cut-off events. For 12391/12391 co-relation queries the response was YES. Maximal size of possible extension queue 7973. Compared 1683947 event pairs, 116872 based on Foata normal form. 0/155011 useless extension candidates. Maximal degree in co-relation 412276. Up to 215166 conditions per place. [2023-08-26 18:50:16,287 INFO L140 encePairwiseOnDemand]: 427/431 looper letters, 57 selfloop transitions, 2 changer transitions 0/67 dead transitions. [2023-08-26 18:50:16,287 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 66 places, 67 transitions, 300 flow [2023-08-26 18:50:16,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:50:16,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:50:16,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 568 transitions. [2023-08-26 18:50:16,289 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43928847641144625 [2023-08-26 18:50:16,289 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 568 transitions. [2023-08-26 18:50:16,289 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 568 transitions. [2023-08-26 18:50:16,290 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:50:16,290 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 568 transitions. [2023-08-26 18:50:16,291 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 189.33333333333334) internal successors, (568), 3 states have internal predecessors, (568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:16,292 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 431.0) internal successors, (1724), 4 states have internal predecessors, (1724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:16,293 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 431.0) internal successors, (1724), 4 states have internal predecessors, (1724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:16,293 INFO L175 Difference]: Start difference. First operand has 64 places, 59 transitions, 166 flow. Second operand 3 states and 568 transitions. [2023-08-26 18:50:16,293 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 66 places, 67 transitions, 300 flow [2023-08-26 18:50:17,182 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 64 places, 67 transitions, 296 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:50:17,183 INFO L231 Difference]: Finished difference. Result has 65 places, 60 transitions, 176 flow [2023-08-26 18:50:17,183 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=431, PETRI_DIFFERENCE_MINUEND_FLOW=162, PETRI_DIFFERENCE_MINUEND_PLACES=62, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=176, PETRI_PLACES=65, PETRI_TRANSITIONS=60} [2023-08-26 18:50:17,183 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, -1 predicate places. [2023-08-26 18:50:17,183 INFO L495 AbstractCegarLoop]: Abstraction has has 65 places, 60 transitions, 176 flow [2023-08-26 18:50:17,184 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 169.66666666666666) internal successors, (509), 3 states have internal predecessors, (509), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:17,184 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:17,184 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:50:17,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-08-26 18:50:17,184 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting t_funErr0ASSERT_VIOLATIONASSERT === [t_funErr0ASSERT_VIOLATIONASSERT, t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-08-26 18:50:17,184 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:17,184 INFO L85 PathProgramCache]: Analyzing trace with hash -1710979319, now seen corresponding path program 1 times [2023-08-26 18:50:17,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:17,185 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [62748304] [2023-08-26 18:50:17,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:17,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:17,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:17,220 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:50:17,221 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:50:17,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [62748304] [2023-08-26 18:50:17,221 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [62748304] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:50:17,221 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:50:17,221 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:50:17,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022174153] [2023-08-26 18:50:17,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:50:17,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:50:17,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:50:17,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:50:17,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:50:17,224 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 180 out of 431 [2023-08-26 18:50:17,224 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 65 places, 60 transitions, 176 flow. Second operand has 3 states, 3 states have (on average 181.66666666666666) internal successors, (545), 3 states have internal predecessors, (545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:17,225 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:50:17,225 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 180 of 431 [2023-08-26 18:50:17,225 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:50:31,140 INFO L124 PetriNetUnfolderBase]: 179493/249301 cut-off events. [2023-08-26 18:50:31,140 INFO L125 PetriNetUnfolderBase]: For 9156/9156 co-relation queries the response was YES. [2023-08-26 18:50:31,599 INFO L83 FinitePrefix]: Finished finitePrefix Result has 497029 conditions, 249301 events. 179493/249301 cut-off events. For 9156/9156 co-relation queries the response was YES. Maximal size of possible extension queue 7686. Compared 1886951 event pairs, 86794 based on Foata normal form. 0/185502 useless extension candidates. Maximal degree in co-relation 496982. Up to 163824 conditions per place. [2023-08-26 18:50:32,304 INFO L140 encePairwiseOnDemand]: 419/431 looper letters, 82 selfloop transitions, 4 changer transitions 1/94 dead transitions. [2023-08-26 18:50:32,304 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 67 places, 94 transitions, 428 flow [2023-08-26 18:50:32,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:50:32,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:50:32,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 633 transitions. [2023-08-26 18:50:32,306 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4895591647331787 [2023-08-26 18:50:32,306 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 633 transitions. [2023-08-26 18:50:32,306 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 633 transitions. [2023-08-26 18:50:32,307 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:50:32,307 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 633 transitions. [2023-08-26 18:50:32,308 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 211.0) internal successors, (633), 3 states have internal predecessors, (633), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:32,310 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 431.0) internal successors, (1724), 4 states have internal predecessors, (1724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:32,310 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 431.0) internal successors, (1724), 4 states have internal predecessors, (1724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:32,310 INFO L175 Difference]: Start difference. First operand has 65 places, 60 transitions, 176 flow. Second operand 3 states and 633 transitions. [2023-08-26 18:50:32,310 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 67 places, 94 transitions, 428 flow [2023-08-26 18:50:32,317 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 66 places, 94 transitions, 426 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:50:32,318 INFO L231 Difference]: Finished difference. Result has 68 places, 62 transitions, 208 flow [2023-08-26 18:50:32,318 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=431, PETRI_DIFFERENCE_MINUEND_FLOW=174, PETRI_DIFFERENCE_MINUEND_PLACES=64, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=60, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=56, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=208, PETRI_PLACES=68, PETRI_TRANSITIONS=62} [2023-08-26 18:50:32,318 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, 2 predicate places. [2023-08-26 18:50:32,318 INFO L495 AbstractCegarLoop]: Abstraction has has 68 places, 62 transitions, 208 flow [2023-08-26 18:50:32,319 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 181.66666666666666) internal successors, (545), 3 states have internal predecessors, (545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:32,319 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:32,319 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:50:32,319 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2023-08-26 18:50:32,319 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-08-26 18:50:32,319 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:32,319 INFO L85 PathProgramCache]: Analyzing trace with hash -1711323461, now seen corresponding path program 1 times [2023-08-26 18:50:32,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:32,320 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465108054] [2023-08-26 18:50:32,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:32,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:32,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:32,369 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 18:50:32,369 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:50:32,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465108054] [2023-08-26 18:50:32,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465108054] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:50:32,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863283306] [2023-08-26 18:50:32,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:32,370 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:50:32,370 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:50:32,371 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 18:50:32,373 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 18:50:32,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:32,445 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:50:32,446 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:50:32,454 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:50:32,487 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 18:50:32,487 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:50:32,524 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 18:50:32,524 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863283306] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:50:32,524 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:50:32,524 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:50:32,524 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560478741] [2023-08-26 18:50:32,524 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:50:32,525 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:50:32,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:50:32,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:50:32,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:50:32,526 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 169 out of 431 [2023-08-26 18:50:32,527 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 68 places, 62 transitions, 208 flow. Second operand has 8 states, 8 states have (on average 170.875) internal successors, (1367), 8 states have internal predecessors, (1367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:32,528 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:50:32,528 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 169 of 431 [2023-08-26 18:50:32,528 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:50:45,963 INFO L124 PetriNetUnfolderBase]: 166004/230138 cut-off events. [2023-08-26 18:50:45,964 INFO L125 PetriNetUnfolderBase]: For 39398/39398 co-relation queries the response was YES. [2023-08-26 18:50:46,406 INFO L83 FinitePrefix]: Finished finitePrefix Result has 518977 conditions, 230138 events. 166004/230138 cut-off events. For 39398/39398 co-relation queries the response was YES. Maximal size of possible extension queue 7544. Compared 1764368 event pairs, 45264 based on Foata normal form. 155/191226 useless extension candidates. Maximal degree in co-relation 81173. Up to 213729 conditions per place. [2023-08-26 18:50:47,081 INFO L140 encePairwiseOnDemand]: 426/431 looper letters, 110 selfloop transitions, 6 changer transitions 1/124 dead transitions. [2023-08-26 18:50:47,082 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 124 transitions, 574 flow [2023-08-26 18:50:47,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 18:50:47,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 18:50:47,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1304 transitions. [2023-08-26 18:50:47,084 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4322174345376201 [2023-08-26 18:50:47,084 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1304 transitions. [2023-08-26 18:50:47,084 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1304 transitions. [2023-08-26 18:50:47,085 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:50:47,085 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1304 transitions. [2023-08-26 18:50:47,087 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 186.28571428571428) internal successors, (1304), 7 states have internal predecessors, (1304), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:47,091 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 431.0) internal successors, (3448), 8 states have internal predecessors, (3448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:47,091 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 431.0) internal successors, (3448), 8 states have internal predecessors, (3448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:47,091 INFO L175 Difference]: Start difference. First operand has 68 places, 62 transitions, 208 flow. Second operand 7 states and 1304 transitions. [2023-08-26 18:50:47,091 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 124 transitions, 574 flow [2023-08-26 18:50:47,197 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 69 places, 124 transitions, 564 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-26 18:50:47,198 INFO L231 Difference]: Finished difference. Result has 70 places, 63 transitions, 218 flow [2023-08-26 18:50:47,198 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=431, PETRI_DIFFERENCE_MINUEND_FLOW=194, PETRI_DIFFERENCE_MINUEND_PLACES=63, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=61, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=218, PETRI_PLACES=70, PETRI_TRANSITIONS=63} [2023-08-26 18:50:47,199 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, 4 predicate places. [2023-08-26 18:50:47,199 INFO L495 AbstractCegarLoop]: Abstraction has has 70 places, 63 transitions, 218 flow [2023-08-26 18:50:47,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 170.875) internal successors, (1367), 8 states have internal predecessors, (1367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:47,211 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:47,211 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:50:47,219 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-08-26 18:50:47,415 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:50:47,416 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-08-26 18:50:47,416 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:47,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1594961839, now seen corresponding path program 1 times [2023-08-26 18:50:47,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:47,417 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521956870] [2023-08-26 18:50:47,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:47,417 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:47,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:47,447 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-08-26 18:50:47,447 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:50:47,447 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521956870] [2023-08-26 18:50:47,447 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1521956870] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:50:47,447 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:50:47,448 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 18:50:47,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681477759] [2023-08-26 18:50:47,448 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:50:47,448 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:50:47,448 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:50:47,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:50:47,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:50:47,449 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 182 out of 431 [2023-08-26 18:50:47,450 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 70 places, 63 transitions, 218 flow. Second operand has 3 states, 3 states have (on average 185.33333333333334) internal successors, (556), 3 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:47,450 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:50:47,450 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 182 of 431 [2023-08-26 18:50:47,450 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:51:07,529 INFO L124 PetriNetUnfolderBase]: 219564/302024 cut-off events. [2023-08-26 18:51:07,530 INFO L125 PetriNetUnfolderBase]: For 31468/31468 co-relation queries the response was YES. [2023-08-26 18:51:08,289 INFO L83 FinitePrefix]: Finished finitePrefix Result has 675379 conditions, 302024 events. 219564/302024 cut-off events. For 31468/31468 co-relation queries the response was YES. Maximal size of possible extension queue 10826. Compared 2342206 event pairs, 141260 based on Foata normal form. 0/247928 useless extension candidates. Maximal degree in co-relation 77944. Up to 222770 conditions per place. [2023-08-26 18:51:09,534 INFO L140 encePairwiseOnDemand]: 427/431 looper letters, 88 selfloop transitions, 3 changer transitions 0/98 dead transitions. [2023-08-26 18:51:09,534 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 98 transitions, 496 flow [2023-08-26 18:51:09,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:51:09,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:51:09,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 630 transitions. [2023-08-26 18:51:09,536 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4872389791183295 [2023-08-26 18:51:09,536 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 630 transitions. [2023-08-26 18:51:09,536 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 630 transitions. [2023-08-26 18:51:09,536 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:51:09,537 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 630 transitions. [2023-08-26 18:51:09,538 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 210.0) internal successors, (630), 3 states have internal predecessors, (630), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:09,539 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 431.0) internal successors, (1724), 4 states have internal predecessors, (1724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:09,539 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 431.0) internal successors, (1724), 4 states have internal predecessors, (1724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:09,539 INFO L175 Difference]: Start difference. First operand has 70 places, 63 transitions, 218 flow. Second operand 3 states and 630 transitions. [2023-08-26 18:51:09,540 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 98 transitions, 496 flow [2023-08-26 18:51:09,545 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 68 places, 98 transitions, 480 flow, removed 4 selfloop flow, removed 4 redundant places. [2023-08-26 18:51:09,546 INFO L231 Difference]: Finished difference. Result has 69 places, 65 transitions, 221 flow [2023-08-26 18:51:09,546 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=431, PETRI_DIFFERENCE_MINUEND_FLOW=202, PETRI_DIFFERENCE_MINUEND_PLACES=66, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=63, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=60, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=221, PETRI_PLACES=69, PETRI_TRANSITIONS=65} [2023-08-26 18:51:09,546 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, 3 predicate places. [2023-08-26 18:51:09,547 INFO L495 AbstractCegarLoop]: Abstraction has has 69 places, 65 transitions, 221 flow [2023-08-26 18:51:09,547 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 185.33333333333334) internal successors, (556), 3 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:09,547 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:51:09,547 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:51:09,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-08-26 18:51:09,547 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-08-26 18:51:09,547 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:51:09,547 INFO L85 PathProgramCache]: Analyzing trace with hash -2095749680, now seen corresponding path program 1 times [2023-08-26 18:51:09,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:51:09,548 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182988547] [2023-08-26 18:51:09,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:51:09,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:51:09,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:51:09,616 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-08-26 18:51:09,617 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:51:09,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182988547] [2023-08-26 18:51:09,617 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182988547] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:51:09,617 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:51:09,617 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:51:09,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634585219] [2023-08-26 18:51:09,617 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:51:09,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:51:09,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:51:09,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:51:09,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:51:09,619 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 169 out of 431 [2023-08-26 18:51:09,619 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 65 transitions, 221 flow. Second operand has 4 states, 4 states have (on average 171.75) internal successors, (687), 4 states have internal predecessors, (687), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:09,619 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:51:09,619 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 169 of 431 [2023-08-26 18:51:09,619 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:51:26,010 INFO L124 PetriNetUnfolderBase]: 197848/273464 cut-off events. [2023-08-26 18:51:26,010 INFO L125 PetriNetUnfolderBase]: For 27894/27894 co-relation queries the response was YES. [2023-08-26 18:51:26,570 INFO L83 FinitePrefix]: Finished finitePrefix Result has 627034 conditions, 273464 events. 197848/273464 cut-off events. For 27894/27894 co-relation queries the response was YES. Maximal size of possible extension queue 10031. Compared 2114351 event pairs, 152323 based on Foata normal form. 0/233536 useless extension candidates. Maximal degree in co-relation 72521. Up to 219163 conditions per place. [2023-08-26 18:51:27,396 INFO L140 encePairwiseOnDemand]: 426/431 looper letters, 109 selfloop transitions, 4 changer transitions 1/121 dead transitions. [2023-08-26 18:51:27,396 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 121 transitions, 611 flow [2023-08-26 18:51:27,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:51:27,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:51:27,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 782 transitions. [2023-08-26 18:51:27,398 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45359628770301624 [2023-08-26 18:51:27,398 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 782 transitions. [2023-08-26 18:51:27,398 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 782 transitions. [2023-08-26 18:51:27,398 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:51:27,399 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 782 transitions. [2023-08-26 18:51:27,400 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 195.5) internal successors, (782), 4 states have internal predecessors, (782), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:27,402 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 431.0) internal successors, (2155), 5 states have internal predecessors, (2155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:27,402 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 431.0) internal successors, (2155), 5 states have internal predecessors, (2155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:27,402 INFO L175 Difference]: Start difference. First operand has 69 places, 65 transitions, 221 flow. Second operand 4 states and 782 transitions. [2023-08-26 18:51:27,402 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 121 transitions, 611 flow [2023-08-26 18:51:27,431 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 71 places, 121 transitions, 608 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:51:27,432 INFO L231 Difference]: Finished difference. Result has 72 places, 66 transitions, 234 flow [2023-08-26 18:51:27,432 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=431, PETRI_DIFFERENCE_MINUEND_FLOW=218, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=65, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=61, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=234, PETRI_PLACES=72, PETRI_TRANSITIONS=66} [2023-08-26 18:51:27,432 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, 6 predicate places. [2023-08-26 18:51:27,432 INFO L495 AbstractCegarLoop]: Abstraction has has 72 places, 66 transitions, 234 flow [2023-08-26 18:51:27,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 171.75) internal successors, (687), 4 states have internal predecessors, (687), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:27,433 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:51:27,433 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:51:27,433 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2023-08-26 18:51:27,433 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting t_funErr0ASSERT_VIOLATIONASSERT === [t_funErr0ASSERT_VIOLATIONASSERT, t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-08-26 18:51:27,433 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:51:27,433 INFO L85 PathProgramCache]: Analyzing trace with hash -381322196, now seen corresponding path program 1 times [2023-08-26 18:51:27,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:51:27,434 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295976076] [2023-08-26 18:51:27,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:51:27,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:51:27,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:51:27,533 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:51:27,533 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:51:27,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295976076] [2023-08-26 18:51:27,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295976076] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:51:27,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785900649] [2023-08-26 18:51:27,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:51:27,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:51:27,534 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:51:27,535 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:51:27,537 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-08-26 18:51:27,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:51:27,641 INFO L262 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-26 18:51:27,642 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:51:27,668 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:51:27,668 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:51:27,724 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:51:27,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785900649] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:51:27,724 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:51:27,725 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-26 18:51:27,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045873083] [2023-08-26 18:51:27,725 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:51:27,727 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-26 18:51:27,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:51:27,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-26 18:51:27,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-26 18:51:27,729 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 180 out of 431 [2023-08-26 18:51:27,730 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 66 transitions, 234 flow. Second operand has 13 states, 13 states have (on average 182.92307692307693) internal successors, (2378), 13 states have internal predecessors, (2378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:27,730 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:51:27,730 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 180 of 431 [2023-08-26 18:51:27,730 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:51:28,243 INFO L124 PetriNetUnfolderBase]: 4238/6242 cut-off events. [2023-08-26 18:51:28,243 INFO L125 PetriNetUnfolderBase]: For 2800/2800 co-relation queries the response was YES. [2023-08-26 18:51:28,251 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14078 conditions, 6242 events. 4238/6242 cut-off events. For 2800/2800 co-relation queries the response was YES. Maximal size of possible extension queue 277. Compared 33684 event pairs, 0 based on Foata normal form. 600/6841 useless extension candidates. Maximal degree in co-relation 14068. Up to 2842 conditions per place. [2023-08-26 18:51:28,253 INFO L140 encePairwiseOnDemand]: 428/431 looper letters, 0 selfloop transitions, 0 changer transitions 75/75 dead transitions. [2023-08-26 18:51:28,253 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 53 places, 75 transitions, 340 flow [2023-08-26 18:51:28,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 18:51:28,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 18:51:28,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1331 transitions. [2023-08-26 18:51:28,256 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4411667219091813 [2023-08-26 18:51:28,256 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1331 transitions. [2023-08-26 18:51:28,256 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1331 transitions. [2023-08-26 18:51:28,256 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:51:28,257 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1331 transitions. [2023-08-26 18:51:28,259 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 190.14285714285714) internal successors, (1331), 7 states have internal predecessors, (1331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:28,261 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 431.0) internal successors, (3448), 8 states have internal predecessors, (3448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:28,262 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 431.0) internal successors, (3448), 8 states have internal predecessors, (3448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:28,262 INFO L175 Difference]: Start difference. First operand has 72 places, 66 transitions, 234 flow. Second operand 7 states and 1331 transitions. [2023-08-26 18:51:28,262 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 53 places, 75 transitions, 340 flow [2023-08-26 18:51:28,266 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 50 places, 75 transitions, 325 flow, removed 6 selfloop flow, removed 3 redundant places. [2023-08-26 18:51:28,266 INFO L231 Difference]: Finished difference. Result has 50 places, 0 transitions, 0 flow [2023-08-26 18:51:28,266 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=431, PETRI_DIFFERENCE_MINUEND_FLOW=91, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=0, PETRI_PLACES=50, PETRI_TRANSITIONS=0} [2023-08-26 18:51:28,267 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, -16 predicate places. [2023-08-26 18:51:28,267 INFO L495 AbstractCegarLoop]: Abstraction has has 50 places, 0 transitions, 0 flow [2023-08-26 18:51:28,267 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 182.92307692307693) internal successors, (2378), 13 states have internal predecessors, (2378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:28,267 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (8 of 9 remaining) [2023-08-26 18:51:28,268 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (7 of 9 remaining) [2023-08-26 18:51:28,268 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 9 remaining) [2023-08-26 18:51:28,268 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 9 remaining) [2023-08-26 18:51:28,268 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (4 of 9 remaining) [2023-08-26 18:51:28,268 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (3 of 9 remaining) [2023-08-26 18:51:28,268 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0ASSERT_VIOLATIONASSERT (2 of 9 remaining) [2023-08-26 18:51:28,268 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 9 remaining) [2023-08-26 18:51:28,268 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 9 remaining) [2023-08-26 18:51:28,276 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-08-26 18:51:28,473 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:51:28,473 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:51:28,474 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:51:28,476 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 204 places, 226 transitions, 496 flow [2023-08-26 18:51:28,523 INFO L124 PetriNetUnfolderBase]: 103/765 cut-off events. [2023-08-26 18:51:28,523 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:51:28,526 INFO L83 FinitePrefix]: Finished finitePrefix Result has 820 conditions, 765 events. 103/765 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 3477 event pairs, 6 based on Foata normal form. 0/616 useless extension candidates. Maximal degree in co-relation 542. Up to 32 conditions per place. [2023-08-26 18:51:28,526 INFO L82 GeneralOperation]: Start removeDead. Operand has 204 places, 226 transitions, 496 flow [2023-08-26 18:51:28,529 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 204 places, 226 transitions, 496 flow [2023-08-26 18:51:28,529 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:51:28,529 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 204 places, 226 transitions, 496 flow [2023-08-26 18:51:28,529 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 204 places, 226 transitions, 496 flow [2023-08-26 18:51:28,529 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 204 places, 226 transitions, 496 flow [2023-08-26 18:51:28,572 INFO L124 PetriNetUnfolderBase]: 103/765 cut-off events. [2023-08-26 18:51:28,572 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:51:28,576 INFO L83 FinitePrefix]: Finished finitePrefix Result has 820 conditions, 765 events. 103/765 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 3477 event pairs, 6 based on Foata normal form. 0/616 useless extension candidates. Maximal degree in co-relation 542. Up to 32 conditions per place. [2023-08-26 18:51:28,588 INFO L119 LiptonReduction]: Number of co-enabled transitions 24480 [2023-08-26 18:51:31,681 INFO L134 LiptonReduction]: Checked pairs total: 45977 [2023-08-26 18:51:31,681 INFO L136 LiptonReduction]: Total number of compositions: 203 [2023-08-26 18:51:31,682 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:51:31,683 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;@66b4a6f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:51:31,683 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:51:31,690 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:51:31,690 INFO L124 PetriNetUnfolderBase]: 49/176 cut-off events. [2023-08-26 18:51:31,690 INFO L125 PetriNetUnfolderBase]: For 23/23 co-relation queries the response was YES. [2023-08-26 18:51:31,690 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:51:31,690 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 18:51:31,690 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:51:31,690 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:51:31,690 INFO L85 PathProgramCache]: Analyzing trace with hash -1771828928, now seen corresponding path program 1 times [2023-08-26 18:51:31,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:51:31,690 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174332555] [2023-08-26 18:51:31,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:51:31,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:51:31,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:51:31,720 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:51:31,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:51:31,735 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:51:31,735 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:51:31,735 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:51:31,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2023-08-26 18:51:31,736 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:51:31,737 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:51:31,737 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:51:31,737 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-26 18:51:31,764 INFO L144 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2023-08-26 18:51:31,766 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 227 places, 252 transitions, 564 flow [2023-08-26 18:51:31,883 INFO L124 PetriNetUnfolderBase]: 166/1164 cut-off events. [2023-08-26 18:51:31,883 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-26 18:51:31,898 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1275 conditions, 1164 events. 166/1164 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 6057 event pairs, 23 based on Foata normal form. 0/933 useless extension candidates. Maximal degree in co-relation 810. Up to 80 conditions per place. [2023-08-26 18:51:31,898 INFO L82 GeneralOperation]: Start removeDead. Operand has 227 places, 252 transitions, 564 flow [2023-08-26 18:51:31,904 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 227 places, 252 transitions, 564 flow [2023-08-26 18:51:31,904 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:51:31,905 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 227 places, 252 transitions, 564 flow [2023-08-26 18:51:31,905 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 227 places, 252 transitions, 564 flow [2023-08-26 18:51:31,905 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 227 places, 252 transitions, 564 flow [2023-08-26 18:51:32,017 INFO L124 PetriNetUnfolderBase]: 166/1164 cut-off events. [2023-08-26 18:51:32,017 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-26 18:51:32,026 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1275 conditions, 1164 events. 166/1164 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 6057 event pairs, 23 based on Foata normal form. 0/933 useless extension candidates. Maximal degree in co-relation 810. Up to 80 conditions per place. [2023-08-26 18:51:32,051 INFO L119 LiptonReduction]: Number of co-enabled transitions 33840 [2023-08-26 18:51:35,265 INFO L134 LiptonReduction]: Checked pairs total: 60561 [2023-08-26 18:51:35,265 INFO L136 LiptonReduction]: Total number of compositions: 223 [2023-08-26 18:51:35,267 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:51:35,267 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;@66b4a6f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:51:35,267 INFO L358 AbstractCegarLoop]: Starting to check reachability of 10 error locations. [2023-08-26 18:51:35,268 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:51:35,268 INFO L124 PetriNetUnfolderBase]: 1/3 cut-off events. [2023-08-26 18:51:35,268 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:51:35,268 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:51:35,268 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:51:35,268 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr0ASSERT_VIOLATIONASSERT, t_funErr0ASSERT_VIOLATIONASSERT, t_funErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-08-26 18:51:35,268 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:51:35,269 INFO L85 PathProgramCache]: Analyzing trace with hash 95012, now seen corresponding path program 1 times [2023-08-26 18:51:35,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:51:35,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511017780] [2023-08-26 18:51:35,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:51:35,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:51:35,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:51:35,312 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 18:51:35,312 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:51:35,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511017780] [2023-08-26 18:51:35,312 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511017780] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:51:35,312 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:51:35,312 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:51:35,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348388518] [2023-08-26 18:51:35,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:51:35,313 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:51:35,313 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:51:35,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:51:35,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:51:35,314 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 188 out of 475 [2023-08-26 18:51:35,314 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 95 transitions, 250 flow. Second operand has 3 states, 3 states have (on average 188.66666666666666) internal successors, (566), 3 states have internal predecessors, (566), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:51:35,314 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:51:35,315 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 188 of 475 [2023-08-26 18:51:35,315 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand