/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/pthread-ext/09_fmaxsym.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 17:44:54,877 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 17:44:54,961 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 17:44:54,966 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 17:44:54,966 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 17:44:54,995 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 17:44:54,996 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 17:44:54,996 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 17:44:54,997 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 17:44:55,000 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 17:44:55,000 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 17:44:55,001 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 17:44:55,001 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 17:44:55,002 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 17:44:55,002 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 17:44:55,003 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 17:44:55,003 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 17:44:55,003 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 17:44:55,003 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 17:44:55,003 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 17:44:55,004 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 17:44:55,004 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 17:44:55,005 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 17:44:55,005 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 17:44:55,005 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 17:44:55,006 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 17:44:55,006 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 17:44:55,006 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 17:44:55,006 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 17:44:55,007 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 17:44:55,008 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 17:44:55,008 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 17:44:55,008 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 17:44:55,008 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 17:44:55,008 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 17:44:55,009 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 17:44:55,300 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 17:44:55,322 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 17:44:55,324 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 17:44:55,325 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 17:44:55,326 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 17:44:55,327 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread-ext/09_fmaxsym.i [2023-08-26 17:44:56,356 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 17:44:56,614 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 17:44:56,615 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread-ext/09_fmaxsym.i [2023-08-26 17:44:56,631 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d45be57ba/b6ac084ca42c440dbf84ec86629e5784/FLAG561881b90 [2023-08-26 17:44:56,641 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d45be57ba/b6ac084ca42c440dbf84ec86629e5784 [2023-08-26 17:44:56,643 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 17:44:56,644 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 17:44:56,645 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 17:44:56,645 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 17:44:56,648 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 17:44:56,648 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 05:44:56" (1/1) ... [2023-08-26 17:44:56,649 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f2a8c6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:56, skipping insertion in model container [2023-08-26 17:44:56,649 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 05:44:56" (1/1) ... [2023-08-26 17:44:56,690 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 17:44:57,015 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 17:44:57,025 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 17:44:57,053 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [254] [2023-08-26 17:44:57,054 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [254] [2023-08-26 17:44:57,076 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 17:44:57,118 INFO L206 MainTranslator]: Completed translation [2023-08-26 17:44:57,119 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57 WrapperNode [2023-08-26 17:44:57,119 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 17:44:57,120 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 17:44:57,120 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 17:44:57,120 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 17:44:57,126 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57" (1/1) ... [2023-08-26 17:44:57,153 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57" (1/1) ... [2023-08-26 17:44:57,182 INFO L138 Inliner]: procedures = 171, calls = 25, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 81 [2023-08-26 17:44:57,182 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 17:44:57,183 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 17:44:57,184 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 17:44:57,184 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 17:44:57,191 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57" (1/1) ... [2023-08-26 17:44:57,191 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57" (1/1) ... [2023-08-26 17:44:57,197 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57" (1/1) ... [2023-08-26 17:44:57,198 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57" (1/1) ... [2023-08-26 17:44:57,214 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57" (1/1) ... [2023-08-26 17:44:57,217 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57" (1/1) ... [2023-08-26 17:44:57,218 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57" (1/1) ... [2023-08-26 17:44:57,219 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57" (1/1) ... [2023-08-26 17:44:57,221 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 17:44:57,222 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 17:44:57,222 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 17:44:57,222 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 17:44:57,223 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57" (1/1) ... [2023-08-26 17:44:57,232 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 17:44:57,240 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:44:57,253 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 17:44:57,263 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 17:44:57,290 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 17:44:57,291 INFO L130 BoogieDeclarations]: Found specification of procedure thr1 [2023-08-26 17:44:57,291 INFO L138 BoogieDeclarations]: Found implementation of procedure thr1 [2023-08-26 17:44:57,291 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 17:44:57,291 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 17:44:57,291 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 17:44:57,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 17:44:57,292 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 17:44:57,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 17:44:57,292 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 17:44:57,293 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 17:44:57,413 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 17:44:57,415 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 17:44:57,578 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 17:44:57,627 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 17:44:57,628 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-08-26 17:44:57,630 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 05:44:57 BoogieIcfgContainer [2023-08-26 17:44:57,630 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 17:44:57,635 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 17:44:57,635 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 17:44:57,637 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 17:44:57,638 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 05:44:56" (1/3) ... [2023-08-26 17:44:57,638 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@609cce77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 05:44:57, skipping insertion in model container [2023-08-26 17:44:57,638 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:44:57" (2/3) ... [2023-08-26 17:44:57,639 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@609cce77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 05:44:57, skipping insertion in model container [2023-08-26 17:44:57,639 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 05:44:57" (3/3) ... [2023-08-26 17:44:57,640 INFO L112 eAbstractionObserver]: Analyzing ICFG 09_fmaxsym.i [2023-08-26 17:44:57,659 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 17:44:57,659 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-08-26 17:44:57,660 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 17:44:57,746 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:44:57,781 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 76 places, 80 transitions, 165 flow [2023-08-26 17:44:57,837 INFO L124 PetriNetUnfolderBase]: 8/92 cut-off events. [2023-08-26 17:44:57,837 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:44:57,842 INFO L83 FinitePrefix]: Finished finitePrefix Result has 97 conditions, 92 events. 8/92 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 100 event pairs, 0 based on Foata normal form. 0/75 useless extension candidates. Maximal degree in co-relation 58. Up to 4 conditions per place. [2023-08-26 17:44:57,842 INFO L82 GeneralOperation]: Start removeDead. Operand has 76 places, 80 transitions, 165 flow [2023-08-26 17:44:57,846 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 76 places, 80 transitions, 165 flow [2023-08-26 17:44:57,849 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:44:57,867 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 76 places, 80 transitions, 165 flow [2023-08-26 17:44:57,870 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 76 places, 80 transitions, 165 flow [2023-08-26 17:44:57,871 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 76 places, 80 transitions, 165 flow [2023-08-26 17:44:57,900 INFO L124 PetriNetUnfolderBase]: 8/92 cut-off events. [2023-08-26 17:44:57,900 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:44:57,902 INFO L83 FinitePrefix]: Finished finitePrefix Result has 97 conditions, 92 events. 8/92 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 100 event pairs, 0 based on Foata normal form. 0/75 useless extension candidates. Maximal degree in co-relation 58. Up to 4 conditions per place. [2023-08-26 17:44:57,904 INFO L119 LiptonReduction]: Number of co-enabled transitions 1320 [2023-08-26 17:45:00,924 INFO L134 LiptonReduction]: Checked pairs total: 1427 [2023-08-26 17:45:00,924 INFO L136 LiptonReduction]: Total number of compositions: 90 [2023-08-26 17:45:00,935 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:45:00,941 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;@6686ae92, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:45:00,941 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-08-26 17:45:00,942 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:45:00,943 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 17:45:00,943 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:45:00,943 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:00,943 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:45:00,944 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 17:45:00,947 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:00,948 INFO L85 PathProgramCache]: Analyzing trace with hash 12626, now seen corresponding path program 1 times [2023-08-26 17:45:00,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:00,956 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150971886] [2023-08-26 17:45:00,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:00,956 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:01,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:01,124 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 17:45:01,124 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:01,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150971886] [2023-08-26 17:45:01,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150971886] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:01,125 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:01,125 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:45:01,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670116093] [2023-08-26 17:45:01,127 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:01,133 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:45:01,138 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:01,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:45:01,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:45:01,156 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 170 [2023-08-26 17:45:01,158 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 16 places, 14 transitions, 33 flow. Second operand has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 3 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,158 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:01,158 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 170 [2023-08-26 17:45:01,159 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:01,191 INFO L124 PetriNetUnfolderBase]: 16/40 cut-off events. [2023-08-26 17:45:01,191 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:45:01,192 INFO L83 FinitePrefix]: Finished finitePrefix Result has 85 conditions, 40 events. 16/40 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 91 event pairs, 12 based on Foata normal form. 0/22 useless extension candidates. Maximal degree in co-relation 70. Up to 39 conditions per place. [2023-08-26 17:45:01,193 INFO L140 encePairwiseOnDemand]: 166/170 looper letters, 9 selfloop transitions, 1 changer transitions 0/11 dead transitions. [2023-08-26 17:45:01,193 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 15 places, 11 transitions, 47 flow [2023-08-26 17:45:01,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:01,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:01,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 184 transitions. [2023-08-26 17:45:01,208 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3607843137254902 [2023-08-26 17:45:01,208 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 184 transitions. [2023-08-26 17:45:01,208 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 184 transitions. [2023-08-26 17:45:01,210 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:01,212 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 184 transitions. [2023-08-26 17:45:01,215 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 61.333333333333336) internal successors, (184), 3 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,219 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 170.0) internal successors, (680), 4 states have internal predecessors, (680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,219 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 170.0) internal successors, (680), 4 states have internal predecessors, (680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,220 INFO L175 Difference]: Start difference. First operand has 16 places, 14 transitions, 33 flow. Second operand 3 states and 184 transitions. [2023-08-26 17:45:01,221 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 15 places, 11 transitions, 47 flow [2023-08-26 17:45:01,222 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 15 places, 11 transitions, 47 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 17:45:01,223 INFO L231 Difference]: Finished difference. Result has 15 places, 11 transitions, 29 flow [2023-08-26 17:45:01,225 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=170, PETRI_DIFFERENCE_MINUEND_FLOW=27, PETRI_DIFFERENCE_MINUEND_PLACES=13, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=11, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=10, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=29, PETRI_PLACES=15, PETRI_TRANSITIONS=11} [2023-08-26 17:45:01,227 INFO L281 CegarLoopForPetriNet]: 16 programPoint places, -1 predicate places. [2023-08-26 17:45:01,228 INFO L495 AbstractCegarLoop]: Abstraction has has 15 places, 11 transitions, 29 flow [2023-08-26 17:45:01,228 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 3 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,228 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:01,228 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:45:01,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 17:45:01,229 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 17:45:01,229 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:01,229 INFO L85 PathProgramCache]: Analyzing trace with hash 12627, now seen corresponding path program 1 times [2023-08-26 17:45:01,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:01,230 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48318808] [2023-08-26 17:45:01,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:01,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:01,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:01,316 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 17:45:01,316 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:01,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48318808] [2023-08-26 17:45:01,317 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48318808] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:01,317 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:01,317 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:45:01,317 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098117949] [2023-08-26 17:45:01,317 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:01,318 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:45:01,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:01,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:45:01,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:45:01,320 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 58 out of 170 [2023-08-26 17:45:01,320 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 15 places, 11 transitions, 29 flow. Second operand has 3 states, 3 states have (on average 58.666666666666664) internal successors, (176), 3 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,320 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:01,320 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 58 of 170 [2023-08-26 17:45:01,320 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:01,346 INFO L124 PetriNetUnfolderBase]: 11/29 cut-off events. [2023-08-26 17:45:01,346 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:45:01,346 INFO L83 FinitePrefix]: Finished finitePrefix Result has 65 conditions, 29 events. 11/29 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 57 event pairs, 8 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 58. Up to 28 conditions per place. [2023-08-26 17:45:01,347 INFO L140 encePairwiseOnDemand]: 168/170 looper letters, 7 selfloop transitions, 1 changer transitions 1/10 dead transitions. [2023-08-26 17:45:01,347 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 16 places, 10 transitions, 45 flow [2023-08-26 17:45:01,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:01,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:01,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 184 transitions. [2023-08-26 17:45:01,349 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3607843137254902 [2023-08-26 17:45:01,349 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 184 transitions. [2023-08-26 17:45:01,349 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 184 transitions. [2023-08-26 17:45:01,349 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:01,350 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 184 transitions. [2023-08-26 17:45:01,350 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 61.333333333333336) internal successors, (184), 3 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,352 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 170.0) internal successors, (680), 4 states have internal predecessors, (680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,352 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 170.0) internal successors, (680), 4 states have internal predecessors, (680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,352 INFO L175 Difference]: Start difference. First operand has 15 places, 11 transitions, 29 flow. Second operand 3 states and 184 transitions. [2023-08-26 17:45:01,352 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 16 places, 10 transitions, 45 flow [2023-08-26 17:45:01,353 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 15 places, 10 transitions, 44 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:45:01,353 INFO L231 Difference]: Finished difference. Result has 15 places, 9 transitions, 26 flow [2023-08-26 17:45:01,353 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=170, PETRI_DIFFERENCE_MINUEND_FLOW=26, PETRI_DIFFERENCE_MINUEND_PLACES=13, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=10, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=9, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=26, PETRI_PLACES=15, PETRI_TRANSITIONS=9} [2023-08-26 17:45:01,354 INFO L281 CegarLoopForPetriNet]: 16 programPoint places, -1 predicate places. [2023-08-26 17:45:01,354 INFO L495 AbstractCegarLoop]: Abstraction has has 15 places, 9 transitions, 26 flow [2023-08-26 17:45:01,354 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 58.666666666666664) internal successors, (176), 3 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,354 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:01,354 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 17:45:01,354 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 17:45:01,355 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 17:45:01,355 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:01,355 INFO L85 PathProgramCache]: Analyzing trace with hash 376389158, now seen corresponding path program 1 times [2023-08-26 17:45:01,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:01,356 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120468787] [2023-08-26 17:45:01,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:01,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:01,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:01,488 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 17:45:01,488 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:01,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120468787] [2023-08-26 17:45:01,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [120468787] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:01,489 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:01,489 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:01,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138085297] [2023-08-26 17:45:01,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:01,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 17:45:01,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:01,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 17:45:01,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 17:45:01,491 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 49 out of 170 [2023-08-26 17:45:01,491 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 15 places, 9 transitions, 26 flow. Second operand has 4 states, 4 states have (on average 50.25) internal successors, (201), 4 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,491 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:01,491 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 49 of 170 [2023-08-26 17:45:01,491 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:01,535 INFO L124 PetriNetUnfolderBase]: 7/19 cut-off events. [2023-08-26 17:45:01,536 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:45:01,536 INFO L83 FinitePrefix]: Finished finitePrefix Result has 46 conditions, 19 events. 7/19 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 23 event pairs, 4 based on Foata normal form. 0/16 useless extension candidates. Maximal degree in co-relation 38. Up to 18 conditions per place. [2023-08-26 17:45:01,536 INFO L140 encePairwiseOnDemand]: 168/170 looper letters, 6 selfloop transitions, 1 changer transitions 0/8 dead transitions. [2023-08-26 17:45:01,536 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 15 places, 8 transitions, 38 flow [2023-08-26 17:45:01,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:01,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:01,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 155 transitions. [2023-08-26 17:45:01,538 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.30392156862745096 [2023-08-26 17:45:01,538 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 155 transitions. [2023-08-26 17:45:01,538 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 155 transitions. [2023-08-26 17:45:01,538 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:01,538 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 155 transitions. [2023-08-26 17:45:01,539 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 51.666666666666664) internal successors, (155), 3 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,540 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 170.0) internal successors, (680), 4 states have internal predecessors, (680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,540 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 170.0) internal successors, (680), 4 states have internal predecessors, (680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,540 INFO L175 Difference]: Start difference. First operand has 15 places, 9 transitions, 26 flow. Second operand 3 states and 155 transitions. [2023-08-26 17:45:01,541 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 15 places, 8 transitions, 38 flow [2023-08-26 17:45:01,541 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 14 places, 8 transitions, 37 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:45:01,541 INFO L231 Difference]: Finished difference. Result has 14 places, 8 transitions, 25 flow [2023-08-26 17:45:01,541 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=170, PETRI_DIFFERENCE_MINUEND_FLOW=23, PETRI_DIFFERENCE_MINUEND_PLACES=12, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=8, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=7, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=25, PETRI_PLACES=14, PETRI_TRANSITIONS=8} [2023-08-26 17:45:01,542 INFO L281 CegarLoopForPetriNet]: 16 programPoint places, -2 predicate places. [2023-08-26 17:45:01,542 INFO L495 AbstractCegarLoop]: Abstraction has has 14 places, 8 transitions, 25 flow [2023-08-26 17:45:01,542 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 50.25) internal successors, (201), 4 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,542 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:01,542 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 17:45:01,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-08-26 17:45:01,543 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 17:45:01,546 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:01,546 INFO L85 PathProgramCache]: Analyzing trace with hash 376389159, now seen corresponding path program 1 times [2023-08-26 17:45:01,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:01,546 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062625812] [2023-08-26 17:45:01,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:01,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:01,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:01,774 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 17:45:01,774 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:01,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062625812] [2023-08-26 17:45:01,774 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062625812] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:01,775 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:01,775 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:01,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806570287] [2023-08-26 17:45:01,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:01,775 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 17:45:01,775 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:01,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 17:45:01,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 17:45:01,777 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 47 out of 170 [2023-08-26 17:45:01,777 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 14 places, 8 transitions, 25 flow. Second operand has 4 states, 4 states have (on average 48.25) internal successors, (193), 4 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,777 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:01,777 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 47 of 170 [2023-08-26 17:45:01,777 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:01,810 INFO L124 PetriNetUnfolderBase]: 9/24 cut-off events. [2023-08-26 17:45:01,810 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:45:01,810 INFO L83 FinitePrefix]: Finished finitePrefix Result has 57 conditions, 24 events. 9/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 32 event pairs, 4 based on Foata normal form. 0/21 useless extension candidates. Maximal degree in co-relation 48. Up to 18 conditions per place. [2023-08-26 17:45:01,810 INFO L140 encePairwiseOnDemand]: 166/170 looper letters, 7 selfloop transitions, 3 changer transitions 0/11 dead transitions. [2023-08-26 17:45:01,810 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 17 places, 11 transitions, 51 flow [2023-08-26 17:45:01,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 17:45:01,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 17:45:01,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 199 transitions. [2023-08-26 17:45:01,812 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.2926470588235294 [2023-08-26 17:45:01,812 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 199 transitions. [2023-08-26 17:45:01,812 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 199 transitions. [2023-08-26 17:45:01,812 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:01,812 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 199 transitions. [2023-08-26 17:45:01,813 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 49.75) internal successors, (199), 4 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,815 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 170.0) internal successors, (850), 5 states have internal predecessors, (850), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,815 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 170.0) internal successors, (850), 5 states have internal predecessors, (850), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,815 INFO L175 Difference]: Start difference. First operand has 14 places, 8 transitions, 25 flow. Second operand 4 states and 199 transitions. [2023-08-26 17:45:01,815 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 17 places, 11 transitions, 51 flow [2023-08-26 17:45:01,816 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 16 places, 11 transitions, 50 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:45:01,816 INFO L231 Difference]: Finished difference. Result has 17 places, 9 transitions, 38 flow [2023-08-26 17:45:01,816 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=170, PETRI_DIFFERENCE_MINUEND_FLOW=24, PETRI_DIFFERENCE_MINUEND_PLACES=13, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=8, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=5, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=38, PETRI_PLACES=17, PETRI_TRANSITIONS=9} [2023-08-26 17:45:01,817 INFO L281 CegarLoopForPetriNet]: 16 programPoint places, 1 predicate places. [2023-08-26 17:45:01,817 INFO L495 AbstractCegarLoop]: Abstraction has has 17 places, 9 transitions, 38 flow [2023-08-26 17:45:01,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 48.25) internal successors, (193), 4 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:01,817 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:01,817 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 17:45:01,817 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 17:45:01,818 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 17:45:01,818 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:01,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1216835703, now seen corresponding path program 1 times [2023-08-26 17:45:01,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:01,818 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500483856] [2023-08-26 17:45:01,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:01,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:01,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:02,168 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 17:45:02,169 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:02,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500483856] [2023-08-26 17:45:02,170 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500483856] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:45:02,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [794559313] [2023-08-26 17:45:02,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:02,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:45:02,171 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:45:02,177 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 17:45:02,229 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 17:45:02,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:02,281 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 24 conjunts are in the unsatisfiable core [2023-08-26 17:45:02,287 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:45:02,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 17:45:02,332 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2023-08-26 17:45:02,487 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 17:45:02,487 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:45:02,591 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 17:45:02,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [794559313] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:45:02,592 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:45:02,592 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2023-08-26 17:45:02,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555981055] [2023-08-26 17:45:02,593 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:45:02,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-08-26 17:45:02,598 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:02,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-08-26 17:45:02,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2023-08-26 17:45:02,600 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 46 out of 170 [2023-08-26 17:45:02,600 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 17 places, 9 transitions, 38 flow. Second operand has 11 states, 11 states have (on average 47.63636363636363) internal successors, (524), 11 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 17:45:02,600 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:02,600 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 46 of 170 [2023-08-26 17:45:02,600 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:02,793 INFO L124 PetriNetUnfolderBase]: 11/29 cut-off events. [2023-08-26 17:45:02,793 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:45:02,793 INFO L83 FinitePrefix]: Finished finitePrefix Result has 87 conditions, 29 events. 11/29 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 40 event pairs, 0 based on Foata normal form. 0/26 useless extension candidates. Maximal degree in co-relation 76. Up to 13 conditions per place. [2023-08-26 17:45:02,794 INFO L140 encePairwiseOnDemand]: 166/170 looper letters, 10 selfloop transitions, 5 changer transitions 0/16 dead transitions. [2023-08-26 17:45:02,794 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 16 transitions, 84 flow [2023-08-26 17:45:02,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 17:45:02,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 17:45:02,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 292 transitions. [2023-08-26 17:45:02,795 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.28627450980392155 [2023-08-26 17:45:02,795 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 292 transitions. [2023-08-26 17:45:02,795 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 292 transitions. [2023-08-26 17:45:02,796 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:02,796 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 292 transitions. [2023-08-26 17:45:02,797 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 48.666666666666664) internal successors, (292), 6 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:02,800 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 170.0) internal successors, (1190), 7 states have internal predecessors, (1190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:02,801 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 170.0) internal successors, (1190), 7 states have internal predecessors, (1190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:02,801 INFO L175 Difference]: Start difference. First operand has 17 places, 9 transitions, 38 flow. Second operand 6 states and 292 transitions. [2023-08-26 17:45:02,801 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 16 transitions, 84 flow [2023-08-26 17:45:02,801 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 20 places, 16 transitions, 78 flow, removed 1 selfloop flow, removed 2 redundant places. [2023-08-26 17:45:02,802 INFO L231 Difference]: Finished difference. Result has 21 places, 10 transitions, 51 flow [2023-08-26 17:45:02,802 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=170, PETRI_DIFFERENCE_MINUEND_FLOW=32, PETRI_DIFFERENCE_MINUEND_PLACES=15, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=9, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=5, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=51, PETRI_PLACES=21, PETRI_TRANSITIONS=10} [2023-08-26 17:45:02,804 INFO L281 CegarLoopForPetriNet]: 16 programPoint places, 5 predicate places. [2023-08-26 17:45:02,804 INFO L495 AbstractCegarLoop]: Abstraction has has 21 places, 10 transitions, 51 flow [2023-08-26 17:45:02,805 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 47.63636363636363) internal successors, (524), 11 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 17:45:02,805 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:02,805 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1] [2023-08-26 17:45:02,816 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 17:45:03,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:45:03,010 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 5 more)] === [2023-08-26 17:45:03,011 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:03,011 INFO L85 PathProgramCache]: Analyzing trace with hash 932801127, now seen corresponding path program 2 times [2023-08-26 17:45:03,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:03,011 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873943672] [2023-08-26 17:45:03,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:03,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:03,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:03,100 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:45:03,103 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:03,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873943672] [2023-08-26 17:45:03,104 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [873943672] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:03,104 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:03,104 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 17:45:03,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450642662] [2023-08-26 17:45:03,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:03,104 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:45:03,104 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:03,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:45:03,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:45:03,106 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 60 out of 170 [2023-08-26 17:45:03,107 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 21 places, 10 transitions, 51 flow. Second operand has 5 states, 5 states have (on average 61.4) internal successors, (307), 5 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:03,107 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:03,107 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 60 of 170 [2023-08-26 17:45:03,107 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:03,137 INFO L124 PetriNetUnfolderBase]: 6/21 cut-off events. [2023-08-26 17:45:03,137 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:45:03,138 INFO L83 FinitePrefix]: Finished finitePrefix Result has 72 conditions, 21 events. 6/21 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 29 event pairs, 0 based on Foata normal form. 6/27 useless extension candidates. Maximal degree in co-relation 60. Up to 7 conditions per place. [2023-08-26 17:45:03,138 INFO L140 encePairwiseOnDemand]: 167/170 looper letters, 0 selfloop transitions, 0 changer transitions 14/14 dead transitions. [2023-08-26 17:45:03,138 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 24 places, 14 transitions, 76 flow [2023-08-26 17:45:03,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 17:45:03,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 17:45:03,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 315 transitions. [2023-08-26 17:45:03,140 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.37058823529411766 [2023-08-26 17:45:03,140 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 315 transitions. [2023-08-26 17:45:03,140 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 315 transitions. [2023-08-26 17:45:03,140 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:03,140 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 315 transitions. [2023-08-26 17:45:03,141 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 63.0) internal successors, (315), 5 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:03,142 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 170.0) internal successors, (1020), 6 states have internal predecessors, (1020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:03,143 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 170.0) internal successors, (1020), 6 states have internal predecessors, (1020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:03,145 INFO L175 Difference]: Start difference. First operand has 21 places, 10 transitions, 51 flow. Second operand 5 states and 315 transitions. [2023-08-26 17:45:03,145 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 24 places, 14 transitions, 76 flow [2023-08-26 17:45:03,146 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 18 places, 14 transitions, 62 flow, removed 2 selfloop flow, removed 6 redundant places. [2023-08-26 17:45:03,146 INFO L231 Difference]: Finished difference. Result has 18 places, 0 transitions, 0 flow [2023-08-26 17:45:03,147 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=170, PETRI_DIFFERENCE_MINUEND_FLOW=24, PETRI_DIFFERENCE_MINUEND_PLACES=14, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=8, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=8, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=18, PETRI_TRANSITIONS=0} [2023-08-26 17:45:03,148 INFO L281 CegarLoopForPetriNet]: 16 programPoint places, 2 predicate places. [2023-08-26 17:45:03,148 INFO L495 AbstractCegarLoop]: Abstraction has has 18 places, 0 transitions, 0 flow [2023-08-26 17:45:03,149 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 61.4) internal successors, (307), 5 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:03,153 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 8 remaining) [2023-08-26 17:45:03,154 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 8 remaining) [2023-08-26 17:45:03,154 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 8 remaining) [2023-08-26 17:45:03,154 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 8 remaining) [2023-08-26 17:45:03,154 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err2ASSERT_VIOLATIONASSERT (3 of 8 remaining) [2023-08-26 17:45:03,154 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err2ASSERT_VIOLATIONASSERT (2 of 8 remaining) [2023-08-26 17:45:03,155 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 8 remaining) [2023-08-26 17:45:03,155 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 8 remaining) [2023-08-26 17:45:03,155 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 17:45:03,155 INFO L445 BasicCegarLoop]: Path program histogram: [2, 1, 1, 1, 1] [2023-08-26 17:45:03,157 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 17:45:03,167 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 76 places, 80 transitions, 165 flow [2023-08-26 17:45:03,185 INFO L124 PetriNetUnfolderBase]: 8/92 cut-off events. [2023-08-26 17:45:03,186 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:45:03,186 INFO L83 FinitePrefix]: Finished finitePrefix Result has 97 conditions, 92 events. 8/92 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 100 event pairs, 0 based on Foata normal form. 0/75 useless extension candidates. Maximal degree in co-relation 58. Up to 4 conditions per place. [2023-08-26 17:45:03,186 INFO L82 GeneralOperation]: Start removeDead. Operand has 76 places, 80 transitions, 165 flow [2023-08-26 17:45:03,187 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 76 places, 80 transitions, 165 flow [2023-08-26 17:45:03,187 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:45:03,187 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 76 places, 80 transitions, 165 flow [2023-08-26 17:45:03,187 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 76 places, 80 transitions, 165 flow [2023-08-26 17:45:03,187 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 76 places, 80 transitions, 165 flow [2023-08-26 17:45:03,198 INFO L124 PetriNetUnfolderBase]: 8/92 cut-off events. [2023-08-26 17:45:03,199 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:45:03,199 INFO L83 FinitePrefix]: Finished finitePrefix Result has 97 conditions, 92 events. 8/92 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 100 event pairs, 0 based on Foata normal form. 0/75 useless extension candidates. Maximal degree in co-relation 58. Up to 4 conditions per place. [2023-08-26 17:45:03,200 INFO L119 LiptonReduction]: Number of co-enabled transitions 1320 [2023-08-26 17:45:05,637 INFO L134 LiptonReduction]: Checked pairs total: 1446 [2023-08-26 17:45:05,638 INFO L136 LiptonReduction]: Total number of compositions: 91 [2023-08-26 17:45:05,639 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 17:45:05,640 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;@6686ae92, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:45:05,640 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 17:45:05,643 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:45:05,643 INFO L124 PetriNetUnfolderBase]: 1/17 cut-off events. [2023-08-26 17:45:05,643 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:45:05,643 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:05,643 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 17:45:05,644 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 17:45:05,644 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:05,644 INFO L85 PathProgramCache]: Analyzing trace with hash 1524199770, now seen corresponding path program 1 times [2023-08-26 17:45:05,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:05,644 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118337113] [2023-08-26 17:45:05,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:05,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:05,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:45:05,663 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 17:45:05,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:45:05,692 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 17:45:05,692 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 17:45:05,693 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 17:45:05,693 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-26 17:45:05,693 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 17:45:05,694 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 17:45:05,694 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 17:45:05,694 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 17:45:05,725 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:45:05,732 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 117 places, 125 transitions, 262 flow [2023-08-26 17:45:05,749 INFO L124 PetriNetUnfolderBase]: 15/151 cut-off events. [2023-08-26 17:45:05,749 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:45:05,752 INFO L83 FinitePrefix]: Finished finitePrefix Result has 161 conditions, 151 events. 15/151 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 288 event pairs, 0 based on Foata normal form. 0/121 useless extension candidates. Maximal degree in co-relation 102. Up to 6 conditions per place. [2023-08-26 17:45:05,752 INFO L82 GeneralOperation]: Start removeDead. Operand has 117 places, 125 transitions, 262 flow [2023-08-26 17:45:05,754 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 117 places, 125 transitions, 262 flow [2023-08-26 17:45:05,754 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:45:05,754 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 117 places, 125 transitions, 262 flow [2023-08-26 17:45:05,755 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 117 places, 125 transitions, 262 flow [2023-08-26 17:45:05,755 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 117 places, 125 transitions, 262 flow [2023-08-26 17:45:05,775 INFO L124 PetriNetUnfolderBase]: 15/151 cut-off events. [2023-08-26 17:45:05,775 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:45:05,776 INFO L83 FinitePrefix]: Finished finitePrefix Result has 161 conditions, 151 events. 15/151 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 288 event pairs, 0 based on Foata normal form. 0/121 useless extension candidates. Maximal degree in co-relation 102. Up to 6 conditions per place. [2023-08-26 17:45:05,779 INFO L119 LiptonReduction]: Number of co-enabled transitions 6600 [2023-08-26 17:45:07,814 INFO L134 LiptonReduction]: Checked pairs total: 11814 [2023-08-26 17:45:07,814 INFO L136 LiptonReduction]: Total number of compositions: 125 [2023-08-26 17:45:07,815 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:45:07,816 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;@6686ae92, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:45:07,816 INFO L358 AbstractCegarLoop]: Starting to check reachability of 11 error locations. [2023-08-26 17:45:07,817 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:45:07,817 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 17:45:07,817 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:45:07,817 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:07,817 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:45:07,818 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:07,818 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:07,818 INFO L85 PathProgramCache]: Analyzing trace with hash 24948, now seen corresponding path program 1 times [2023-08-26 17:45:07,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:07,818 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1561725845] [2023-08-26 17:45:07,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:07,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:07,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:07,843 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 17:45:07,843 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:07,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1561725845] [2023-08-26 17:45:07,844 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1561725845] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:07,844 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:07,844 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:45:07,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499328980] [2023-08-26 17:45:07,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:07,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:45:07,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:07,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:45:07,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:45:07,846 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 92 out of 250 [2023-08-26 17:45:07,847 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 35 places, 34 transitions, 80 flow. Second operand has 3 states, 3 states have (on average 92.66666666666667) internal successors, (278), 3 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:07,847 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:07,847 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 92 of 250 [2023-08-26 17:45:07,847 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:07,946 INFO L124 PetriNetUnfolderBase]: 463/822 cut-off events. [2023-08-26 17:45:07,946 INFO L125 PetriNetUnfolderBase]: For 33/33 co-relation queries the response was YES. [2023-08-26 17:45:07,947 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1577 conditions, 822 events. 463/822 cut-off events. For 33/33 co-relation queries the response was YES. Maximal size of possible extension queue 97. Compared 4561 event pairs, 376 based on Foata normal form. 0/458 useless extension candidates. Maximal degree in co-relation 317. Up to 706 conditions per place. [2023-08-26 17:45:07,951 INFO L140 encePairwiseOnDemand]: 247/250 looper letters, 22 selfloop transitions, 1 changer transitions 0/32 dead transitions. [2023-08-26 17:45:07,951 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 35 places, 32 transitions, 122 flow [2023-08-26 17:45:07,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:07,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:07,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 301 transitions. [2023-08-26 17:45:07,953 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4013333333333333 [2023-08-26 17:45:07,953 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 301 transitions. [2023-08-26 17:45:07,953 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 301 transitions. [2023-08-26 17:45:07,953 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:07,953 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 301 transitions. [2023-08-26 17:45:07,954 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 100.33333333333333) internal successors, (301), 3 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:07,955 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:07,957 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:07,957 INFO L175 Difference]: Start difference. First operand has 35 places, 34 transitions, 80 flow. Second operand 3 states and 301 transitions. [2023-08-26 17:45:07,957 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 35 places, 32 transitions, 122 flow [2023-08-26 17:45:07,959 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 35 places, 32 transitions, 120 flow, removed 1 selfloop flow, removed 0 redundant places. [2023-08-26 17:45:07,960 INFO L231 Difference]: Finished difference. Result has 35 places, 32 transitions, 76 flow [2023-08-26 17:45:07,960 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=74, PETRI_DIFFERENCE_MINUEND_PLACES=33, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=32, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=76, PETRI_PLACES=35, PETRI_TRANSITIONS=32} [2023-08-26 17:45:07,961 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 0 predicate places. [2023-08-26 17:45:07,961 INFO L495 AbstractCegarLoop]: Abstraction has has 35 places, 32 transitions, 76 flow [2023-08-26 17:45:07,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 92.66666666666667) internal successors, (278), 3 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:07,961 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:07,961 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:45:07,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 17:45:07,962 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:07,962 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:07,962 INFO L85 PathProgramCache]: Analyzing trace with hash 24949, now seen corresponding path program 1 times [2023-08-26 17:45:07,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:07,962 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255702078] [2023-08-26 17:45:07,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:07,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:07,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:07,991 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 17:45:07,991 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:07,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255702078] [2023-08-26 17:45:07,991 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255702078] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:07,992 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:07,992 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:45:07,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790426771] [2023-08-26 17:45:07,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:07,992 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:45:07,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:07,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:45:07,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:45:07,993 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 93 out of 250 [2023-08-26 17:45:07,994 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 35 places, 32 transitions, 76 flow. Second operand has 3 states, 3 states have (on average 93.66666666666667) internal successors, (281), 3 states have internal predecessors, (281), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:07,994 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:07,994 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 93 of 250 [2023-08-26 17:45:07,994 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:08,057 INFO L124 PetriNetUnfolderBase]: 282/530 cut-off events. [2023-08-26 17:45:08,058 INFO L125 PetriNetUnfolderBase]: For 25/25 co-relation queries the response was YES. [2023-08-26 17:45:08,059 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1017 conditions, 530 events. 282/530 cut-off events. For 25/25 co-relation queries the response was YES. Maximal size of possible extension queue 59. Compared 2643 event pairs, 224 based on Foata normal form. 0/343 useless extension candidates. Maximal degree in co-relation 1009. Up to 444 conditions per place. [2023-08-26 17:45:08,061 INFO L140 encePairwiseOnDemand]: 248/250 looper letters, 21 selfloop transitions, 1 changer transitions 0/31 dead transitions. [2023-08-26 17:45:08,061 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 36 places, 31 transitions, 118 flow [2023-08-26 17:45:08,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:08,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:08,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 302 transitions. [2023-08-26 17:45:08,064 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4026666666666667 [2023-08-26 17:45:08,064 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 302 transitions. [2023-08-26 17:45:08,064 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 302 transitions. [2023-08-26 17:45:08,064 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:08,064 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 302 transitions. [2023-08-26 17:45:08,065 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 100.66666666666667) internal successors, (302), 3 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,067 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,067 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,067 INFO L175 Difference]: Start difference. First operand has 35 places, 32 transitions, 76 flow. Second operand 3 states and 302 transitions. [2023-08-26 17:45:08,067 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 36 places, 31 transitions, 118 flow [2023-08-26 17:45:08,068 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 35 places, 31 transitions, 117 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:45:08,069 INFO L231 Difference]: Finished difference. Result has 35 places, 31 transitions, 75 flow [2023-08-26 17:45:08,069 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=73, PETRI_DIFFERENCE_MINUEND_PLACES=33, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=30, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=75, PETRI_PLACES=35, PETRI_TRANSITIONS=31} [2023-08-26 17:45:08,070 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 0 predicate places. [2023-08-26 17:45:08,070 INFO L495 AbstractCegarLoop]: Abstraction has has 35 places, 31 transitions, 75 flow [2023-08-26 17:45:08,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 93.66666666666667) internal successors, (281), 3 states have internal predecessors, (281), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,071 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:08,071 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 17:45:08,071 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 17:45:08,071 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:08,071 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:08,071 INFO L85 PathProgramCache]: Analyzing trace with hash 743822649, now seen corresponding path program 1 times [2023-08-26 17:45:08,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:08,072 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896034228] [2023-08-26 17:45:08,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:08,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:08,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:08,154 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 17:45:08,154 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:08,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896034228] [2023-08-26 17:45:08,155 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [896034228] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:08,155 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:08,155 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:08,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240647444] [2023-08-26 17:45:08,155 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:08,158 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 17:45:08,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:08,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 17:45:08,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 17:45:08,159 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 83 out of 250 [2023-08-26 17:45:08,159 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 35 places, 31 transitions, 75 flow. Second operand has 4 states, 4 states have (on average 84.25) internal successors, (337), 4 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,159 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:08,160 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 83 of 250 [2023-08-26 17:45:08,160 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:08,232 INFO L124 PetriNetUnfolderBase]: 227/432 cut-off events. [2023-08-26 17:45:08,232 INFO L125 PetriNetUnfolderBase]: For 22/22 co-relation queries the response was YES. [2023-08-26 17:45:08,233 INFO L83 FinitePrefix]: Finished finitePrefix Result has 827 conditions, 432 events. 227/432 cut-off events. For 22/22 co-relation queries the response was YES. Maximal size of possible extension queue 44. Compared 2045 event pairs, 175 based on Foata normal form. 0/299 useless extension candidates. Maximal degree in co-relation 818. Up to 355 conditions per place. [2023-08-26 17:45:08,235 INFO L140 encePairwiseOnDemand]: 247/250 looper letters, 19 selfloop transitions, 1 changer transitions 0/29 dead transitions. [2023-08-26 17:45:08,235 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 35 places, 29 transitions, 111 flow [2023-08-26 17:45:08,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:08,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:08,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 271 transitions. [2023-08-26 17:45:08,237 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.36133333333333334 [2023-08-26 17:45:08,237 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 271 transitions. [2023-08-26 17:45:08,237 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 271 transitions. [2023-08-26 17:45:08,237 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:08,237 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 271 transitions. [2023-08-26 17:45:08,238 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 90.33333333333333) internal successors, (271), 3 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,239 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,239 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,239 INFO L175 Difference]: Start difference. First operand has 35 places, 31 transitions, 75 flow. Second operand 3 states and 271 transitions. [2023-08-26 17:45:08,239 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 35 places, 29 transitions, 111 flow [2023-08-26 17:45:08,240 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 34 places, 29 transitions, 110 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:45:08,241 INFO L231 Difference]: Finished difference. Result has 34 places, 29 transitions, 72 flow [2023-08-26 17:45:08,241 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=70, PETRI_DIFFERENCE_MINUEND_PLACES=32, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=28, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=72, PETRI_PLACES=34, PETRI_TRANSITIONS=29} [2023-08-26 17:45:08,242 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, -1 predicate places. [2023-08-26 17:45:08,244 INFO L495 AbstractCegarLoop]: Abstraction has has 34 places, 29 transitions, 72 flow [2023-08-26 17:45:08,244 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 84.25) internal successors, (337), 4 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,244 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:08,245 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 17:45:08,245 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 17:45:08,245 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:08,245 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:08,245 INFO L85 PathProgramCache]: Analyzing trace with hash 743822650, now seen corresponding path program 1 times [2023-08-26 17:45:08,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:08,245 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534563363] [2023-08-26 17:45:08,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:08,246 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:08,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:08,371 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 17:45:08,372 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:08,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534563363] [2023-08-26 17:45:08,372 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534563363] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:08,372 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:08,372 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:08,372 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923531629] [2023-08-26 17:45:08,372 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:08,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 17:45:08,373 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:08,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 17:45:08,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 17:45:08,373 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 80 out of 250 [2023-08-26 17:45:08,374 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 34 places, 29 transitions, 72 flow. Second operand has 4 states, 4 states have (on average 81.25) internal successors, (325), 4 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,374 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:08,374 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 80 of 250 [2023-08-26 17:45:08,374 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:08,482 INFO L124 PetriNetUnfolderBase]: 373/685 cut-off events. [2023-08-26 17:45:08,483 INFO L125 PetriNetUnfolderBase]: For 37/37 co-relation queries the response was YES. [2023-08-26 17:45:08,486 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1311 conditions, 685 events. 373/685 cut-off events. For 37/37 co-relation queries the response was YES. Maximal size of possible extension queue 55. Compared 3553 event pairs, 175 based on Foata normal form. 0/487 useless extension candidates. Maximal degree in co-relation 1301. Up to 355 conditions per place. [2023-08-26 17:45:08,489 INFO L140 encePairwiseOnDemand]: 245/250 looper letters, 32 selfloop transitions, 3 changer transitions 0/44 dead transitions. [2023-08-26 17:45:08,489 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 44 transitions, 177 flow [2023-08-26 17:45:08,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 17:45:08,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 17:45:08,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 357 transitions. [2023-08-26 17:45:08,491 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.357 [2023-08-26 17:45:08,491 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 357 transitions. [2023-08-26 17:45:08,491 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 357 transitions. [2023-08-26 17:45:08,491 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:08,491 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 357 transitions. [2023-08-26 17:45:08,492 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 89.25) internal successors, (357), 4 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,494 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 250.0) internal successors, (1250), 5 states have internal predecessors, (1250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,494 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 250.0) internal successors, (1250), 5 states have internal predecessors, (1250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,494 INFO L175 Difference]: Start difference. First operand has 34 places, 29 transitions, 72 flow. Second operand 4 states and 357 transitions. [2023-08-26 17:45:08,494 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 44 transitions, 177 flow [2023-08-26 17:45:08,496 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 36 places, 44 transitions, 176 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:45:08,496 INFO L231 Difference]: Finished difference. Result has 37 places, 30 transitions, 87 flow [2023-08-26 17:45:08,497 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=71, PETRI_DIFFERENCE_MINUEND_PLACES=33, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=26, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=87, PETRI_PLACES=37, PETRI_TRANSITIONS=30} [2023-08-26 17:45:08,498 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 2 predicate places. [2023-08-26 17:45:08,498 INFO L495 AbstractCegarLoop]: Abstraction has has 37 places, 30 transitions, 87 flow [2023-08-26 17:45:08,498 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 81.25) internal successors, (325), 4 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,498 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:08,498 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:08,498 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-08-26 17:45:08,498 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:08,499 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:08,499 INFO L85 PathProgramCache]: Analyzing trace with hash -96109432, now seen corresponding path program 1 times [2023-08-26 17:45:08,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:08,499 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663843003] [2023-08-26 17:45:08,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:08,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:08,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:08,625 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:08,625 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:08,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663843003] [2023-08-26 17:45:08,625 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663843003] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:08,625 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:08,625 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:08,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516735874] [2023-08-26 17:45:08,626 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:08,626 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 17:45:08,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:08,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 17:45:08,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 17:45:08,627 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 81 out of 250 [2023-08-26 17:45:08,627 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 30 transitions, 87 flow. Second operand has 4 states, 4 states have (on average 82.5) internal successors, (330), 4 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,627 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:08,627 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 81 of 250 [2023-08-26 17:45:08,627 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:08,741 INFO L124 PetriNetUnfolderBase]: 451/824 cut-off events. [2023-08-26 17:45:08,741 INFO L125 PetriNetUnfolderBase]: For 153/153 co-relation queries the response was YES. [2023-08-26 17:45:08,743 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1717 conditions, 824 events. 451/824 cut-off events. For 153/153 co-relation queries the response was YES. Maximal size of possible extension queue 58. Compared 4359 event pairs, 147 based on Foata normal form. 0/660 useless extension candidates. Maximal degree in co-relation 1705. Up to 416 conditions per place. [2023-08-26 17:45:08,746 INFO L140 encePairwiseOnDemand]: 245/250 looper letters, 29 selfloop transitions, 4 changer transitions 0/42 dead transitions. [2023-08-26 17:45:08,746 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 42 transitions, 189 flow [2023-08-26 17:45:08,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 17:45:08,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 17:45:08,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 356 transitions. [2023-08-26 17:45:08,748 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.356 [2023-08-26 17:45:08,748 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 356 transitions. [2023-08-26 17:45:08,748 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 356 transitions. [2023-08-26 17:45:08,749 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:08,749 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 356 transitions. [2023-08-26 17:45:08,750 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 89.0) internal successors, (356), 4 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,752 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 250.0) internal successors, (1250), 5 states have internal predecessors, (1250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,752 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 250.0) internal successors, (1250), 5 states have internal predecessors, (1250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,752 INFO L175 Difference]: Start difference. First operand has 37 places, 30 transitions, 87 flow. Second operand 4 states and 356 transitions. [2023-08-26 17:45:08,752 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 42 transitions, 189 flow [2023-08-26 17:45:08,753 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 38 places, 42 transitions, 183 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 17:45:08,754 INFO L231 Difference]: Finished difference. Result has 40 places, 31 transitions, 104 flow [2023-08-26 17:45:08,754 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=83, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=26, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=104, PETRI_PLACES=40, PETRI_TRANSITIONS=31} [2023-08-26 17:45:08,755 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 5 predicate places. [2023-08-26 17:45:08,755 INFO L495 AbstractCegarLoop]: Abstraction has has 40 places, 31 transitions, 104 flow [2023-08-26 17:45:08,755 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 82.5) internal successors, (330), 4 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,755 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:08,755 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:08,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 17:45:08,756 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:08,756 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:08,756 INFO L85 PathProgramCache]: Analyzing trace with hash -1199228750, now seen corresponding path program 1 times [2023-08-26 17:45:08,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:08,756 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145255681] [2023-08-26 17:45:08,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:08,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:08,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:08,778 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 17:45:08,779 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:08,779 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145255681] [2023-08-26 17:45:08,779 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145255681] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:08,779 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:08,779 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:08,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107879085] [2023-08-26 17:45:08,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:08,779 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:45:08,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:08,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:45:08,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:45:08,780 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 93 out of 250 [2023-08-26 17:45:08,781 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 40 places, 31 transitions, 104 flow. Second operand has 3 states, 3 states have (on average 96.0) internal successors, (288), 3 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,781 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:08,781 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 93 of 250 [2023-08-26 17:45:08,781 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:08,925 INFO L124 PetriNetUnfolderBase]: 914/1482 cut-off events. [2023-08-26 17:45:08,926 INFO L125 PetriNetUnfolderBase]: For 374/374 co-relation queries the response was YES. [2023-08-26 17:45:08,929 INFO L83 FinitePrefix]: Finished finitePrefix Result has 3545 conditions, 1482 events. 914/1482 cut-off events. For 374/374 co-relation queries the response was YES. Maximal size of possible extension queue 95. Compared 7944 event pairs, 376 based on Foata normal form. 52/1384 useless extension candidates. Maximal degree in co-relation 3531. Up to 907 conditions per place. [2023-08-26 17:45:08,935 INFO L140 encePairwiseOnDemand]: 244/250 looper letters, 42 selfloop transitions, 6 changer transitions 0/51 dead transitions. [2023-08-26 17:45:08,935 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 42 places, 51 transitions, 269 flow [2023-08-26 17:45:08,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:08,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:08,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 324 transitions. [2023-08-26 17:45:08,937 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.432 [2023-08-26 17:45:08,937 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 324 transitions. [2023-08-26 17:45:08,937 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 324 transitions. [2023-08-26 17:45:08,938 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:08,938 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 324 transitions. [2023-08-26 17:45:08,938 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 108.0) internal successors, (324), 3 states have internal predecessors, (324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,939 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,940 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,940 INFO L175 Difference]: Start difference. First operand has 40 places, 31 transitions, 104 flow. Second operand 3 states and 324 transitions. [2023-08-26 17:45:08,940 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 42 places, 51 transitions, 269 flow [2023-08-26 17:45:08,943 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 40 places, 51 transitions, 262 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 17:45:08,943 INFO L231 Difference]: Finished difference. Result has 42 places, 35 transitions, 146 flow [2023-08-26 17:45:08,943 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=100, PETRI_DIFFERENCE_MINUEND_PLACES=38, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=146, PETRI_PLACES=42, PETRI_TRANSITIONS=35} [2023-08-26 17:45:08,944 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 7 predicate places. [2023-08-26 17:45:08,944 INFO L495 AbstractCegarLoop]: Abstraction has has 42 places, 35 transitions, 146 flow [2023-08-26 17:45:08,944 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 96.0) internal successors, (288), 3 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:08,944 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:08,944 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:08,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 17:45:08,945 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:08,945 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:08,945 INFO L85 PathProgramCache]: Analyzing trace with hash 1478616213, now seen corresponding path program 1 times [2023-08-26 17:45:08,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:08,945 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084771299] [2023-08-26 17:45:08,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:08,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:08,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:09,205 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 17:45:09,205 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:09,205 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084771299] [2023-08-26 17:45:09,205 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084771299] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:45:09,205 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394187786] [2023-08-26 17:45:09,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:09,205 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:45:09,206 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:45:09,207 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 17:45:09,209 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 17:45:09,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:09,273 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 21 conjunts are in the unsatisfiable core [2023-08-26 17:45:09,275 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:45:09,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 17:45:09,286 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2023-08-26 17:45:09,416 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 17:45:09,416 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:45:09,522 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 17:45:09,522 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394187786] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:45:09,522 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:45:09,522 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 13 [2023-08-26 17:45:09,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915529903] [2023-08-26 17:45:09,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:45:09,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-08-26 17:45:09,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:09,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-08-26 17:45:09,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2023-08-26 17:45:09,524 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 76 out of 250 [2023-08-26 17:45:09,525 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 42 places, 35 transitions, 146 flow. Second operand has 15 states, 15 states have (on average 77.8) internal successors, (1167), 15 states have internal predecessors, (1167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:09,525 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:09,526 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 76 of 250 [2023-08-26 17:45:09,526 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:09,887 INFO L124 PetriNetUnfolderBase]: 967/1713 cut-off events. [2023-08-26 17:45:09,888 INFO L125 PetriNetUnfolderBase]: For 1005/1023 co-relation queries the response was YES. [2023-08-26 17:45:09,893 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4437 conditions, 1713 events. 967/1713 cut-off events. For 1005/1023 co-relation queries the response was YES. Maximal size of possible extension queue 100. Compared 9809 event pairs, 258 based on Foata normal form. 0/1633 useless extension candidates. Maximal degree in co-relation 4422. Up to 479 conditions per place. [2023-08-26 17:45:09,901 INFO L140 encePairwiseOnDemand]: 245/250 looper letters, 60 selfloop transitions, 10 changer transitions 0/80 dead transitions. [2023-08-26 17:45:09,901 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 47 places, 80 transitions, 454 flow [2023-08-26 17:45:09,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 17:45:09,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 17:45:09,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 518 transitions. [2023-08-26 17:45:09,903 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3453333333333333 [2023-08-26 17:45:09,903 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 518 transitions. [2023-08-26 17:45:09,903 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 518 transitions. [2023-08-26 17:45:09,903 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:09,903 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 518 transitions. [2023-08-26 17:45:09,905 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 86.33333333333333) internal successors, (518), 6 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:09,906 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 250.0) internal successors, (1750), 7 states have internal predecessors, (1750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:09,907 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 250.0) internal successors, (1750), 7 states have internal predecessors, (1750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:09,907 INFO L175 Difference]: Start difference. First operand has 42 places, 35 transitions, 146 flow. Second operand 6 states and 518 transitions. [2023-08-26 17:45:09,907 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 47 places, 80 transitions, 454 flow [2023-08-26 17:45:09,910 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 80 transitions, 438 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 17:45:09,911 INFO L231 Difference]: Finished difference. Result has 47 places, 39 transitions, 192 flow [2023-08-26 17:45:09,912 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=134, PETRI_DIFFERENCE_MINUEND_PLACES=40, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=35, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=192, PETRI_PLACES=47, PETRI_TRANSITIONS=39} [2023-08-26 17:45:09,912 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 12 predicate places. [2023-08-26 17:45:09,912 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 39 transitions, 192 flow [2023-08-26 17:45:09,913 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 77.8) internal successors, (1167), 15 states have internal predecessors, (1167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:09,913 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:09,913 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:09,921 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 17:45:10,118 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,SelfDestructingSolverStorable13 [2023-08-26 17:45:10,119 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:10,119 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:10,119 INFO L85 PathProgramCache]: Analyzing trace with hash 735286679, now seen corresponding path program 1 times [2023-08-26 17:45:10,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:10,120 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321965210] [2023-08-26 17:45:10,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:10,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:10,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:10,144 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:10,145 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:10,145 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321965210] [2023-08-26 17:45:10,145 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1321965210] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:10,145 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:10,145 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:10,145 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299207299] [2023-08-26 17:45:10,145 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:10,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:45:10,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:10,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:45:10,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:45:10,146 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 93 out of 250 [2023-08-26 17:45:10,147 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 47 places, 39 transitions, 192 flow. Second operand has 3 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:10,147 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:10,147 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 93 of 250 [2023-08-26 17:45:10,147 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:10,449 INFO L124 PetriNetUnfolderBase]: 1653/2669 cut-off events. [2023-08-26 17:45:10,450 INFO L125 PetriNetUnfolderBase]: For 2420/2420 co-relation queries the response was YES. [2023-08-26 17:45:10,455 INFO L83 FinitePrefix]: Finished finitePrefix Result has 7404 conditions, 2669 events. 1653/2669 cut-off events. For 2420/2420 co-relation queries the response was YES. Maximal size of possible extension queue 140. Compared 15386 event pairs, 647 based on Foata normal form. 72/2661 useless extension candidates. Maximal degree in co-relation 7386. Up to 1470 conditions per place. [2023-08-26 17:45:10,468 INFO L140 encePairwiseOnDemand]: 244/250 looper letters, 56 selfloop transitions, 6 changer transitions 0/65 dead transitions. [2023-08-26 17:45:10,468 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 65 transitions, 455 flow [2023-08-26 17:45:10,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:10,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:10,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 324 transitions. [2023-08-26 17:45:10,470 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.432 [2023-08-26 17:45:10,470 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 324 transitions. [2023-08-26 17:45:10,470 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 324 transitions. [2023-08-26 17:45:10,470 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:10,470 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 324 transitions. [2023-08-26 17:45:10,471 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 108.0) internal successors, (324), 3 states have internal predecessors, (324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:10,472 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:10,473 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:10,473 INFO L175 Difference]: Start difference. First operand has 47 places, 39 transitions, 192 flow. Second operand 3 states and 324 transitions. [2023-08-26 17:45:10,473 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 65 transitions, 455 flow [2023-08-26 17:45:10,477 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 47 places, 65 transitions, 440 flow, removed 4 selfloop flow, removed 2 redundant places. [2023-08-26 17:45:10,478 INFO L231 Difference]: Finished difference. Result has 49 places, 42 transitions, 227 flow [2023-08-26 17:45:10,478 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=184, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=39, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=33, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=227, PETRI_PLACES=49, PETRI_TRANSITIONS=42} [2023-08-26 17:45:10,478 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 14 predicate places. [2023-08-26 17:45:10,478 INFO L495 AbstractCegarLoop]: Abstraction has has 49 places, 42 transitions, 227 flow [2023-08-26 17:45:10,478 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:10,479 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:10,479 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:10,479 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-26 17:45:10,479 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:10,479 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:10,479 INFO L85 PathProgramCache]: Analyzing trace with hash 1319051682, now seen corresponding path program 1 times [2023-08-26 17:45:10,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:10,479 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126375888] [2023-08-26 17:45:10,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:10,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:10,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:10,858 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-08-26 17:45:10,858 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:10,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126375888] [2023-08-26 17:45:10,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1126375888] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:45:10,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230928642] [2023-08-26 17:45:10,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:10,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:45:10,859 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:45:10,859 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 17:45:10,882 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 17:45:10,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:10,933 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 21 conjunts are in the unsatisfiable core [2023-08-26 17:45:10,934 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:45:10,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 17:45:10,953 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2023-08-26 17:45:11,124 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:11,124 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:45:11,253 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:11,253 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230928642] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:45:11,253 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:45:11,253 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 15 [2023-08-26 17:45:11,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245755430] [2023-08-26 17:45:11,254 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:45:11,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-08-26 17:45:11,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:11,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-08-26 17:45:11,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2023-08-26 17:45:11,255 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 61 out of 250 [2023-08-26 17:45:11,256 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 42 transitions, 227 flow. Second operand has 17 states, 17 states have (on average 63.0) internal successors, (1071), 17 states have internal predecessors, (1071), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:11,256 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:11,257 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 61 of 250 [2023-08-26 17:45:11,257 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:13,022 INFO L124 PetriNetUnfolderBase]: 5890/9406 cut-off events. [2023-08-26 17:45:13,022 INFO L125 PetriNetUnfolderBase]: For 10409/10409 co-relation queries the response was YES. [2023-08-26 17:45:13,049 INFO L83 FinitePrefix]: Finished finitePrefix Result has 28958 conditions, 9406 events. 5890/9406 cut-off events. For 10409/10409 co-relation queries the response was YES. Maximal size of possible extension queue 443. Compared 64807 event pairs, 635 based on Foata normal form. 218/9620 useless extension candidates. Maximal degree in co-relation 28939. Up to 1908 conditions per place. [2023-08-26 17:45:13,101 INFO L140 encePairwiseOnDemand]: 241/250 looper letters, 297 selfloop transitions, 32 changer transitions 0/332 dead transitions. [2023-08-26 17:45:13,101 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 332 transitions, 2440 flow [2023-08-26 17:45:13,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-08-26 17:45:13,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2023-08-26 17:45:13,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 1274 transitions. [2023-08-26 17:45:13,106 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.29976470588235293 [2023-08-26 17:45:13,106 INFO L72 ComplementDD]: Start complementDD. Operand 17 states and 1274 transitions. [2023-08-26 17:45:13,106 INFO L73 IsDeterministic]: Start isDeterministic. Operand 17 states and 1274 transitions. [2023-08-26 17:45:13,107 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:13,107 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 17 states and 1274 transitions. [2023-08-26 17:45:13,109 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 18 states, 17 states have (on average 74.94117647058823) internal successors, (1274), 17 states have internal predecessors, (1274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:13,117 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 18 states, 18 states have (on average 250.0) internal successors, (4500), 18 states have internal predecessors, (4500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:13,118 INFO L81 ComplementDD]: Finished complementDD. Result has 18 states, 18 states have (on average 250.0) internal successors, (4500), 18 states have internal predecessors, (4500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:13,118 INFO L175 Difference]: Start difference. First operand has 49 places, 42 transitions, 227 flow. Second operand 17 states and 1274 transitions. [2023-08-26 17:45:13,118 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 332 transitions, 2440 flow [2023-08-26 17:45:13,141 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 63 places, 332 transitions, 2366 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 17:45:13,145 INFO L231 Difference]: Finished difference. Result has 74 places, 70 transitions, 536 flow [2023-08-26 17:45:13,146 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=215, PETRI_DIFFERENCE_MINUEND_PLACES=47, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=42, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=30, PETRI_DIFFERENCE_SUBTRAHEND_STATES=17, PETRI_FLOW=536, PETRI_PLACES=74, PETRI_TRANSITIONS=70} [2023-08-26 17:45:13,147 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 39 predicate places. [2023-08-26 17:45:13,147 INFO L495 AbstractCegarLoop]: Abstraction has has 74 places, 70 transitions, 536 flow [2023-08-26 17:45:13,147 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 63.0) internal successors, (1071), 17 states have internal predecessors, (1071), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:13,148 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:13,148 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 17:45:13,155 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 17:45:13,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:45:13,353 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:13,353 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:13,353 INFO L85 PathProgramCache]: Analyzing trace with hash -540002790, now seen corresponding path program 2 times [2023-08-26 17:45:13,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:13,353 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137553311] [2023-08-26 17:45:13,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:13,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:13,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:13,397 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:45:13,397 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:13,397 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137553311] [2023-08-26 17:45:13,397 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137553311] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:45:13,397 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518977636] [2023-08-26 17:45:13,397 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 17:45:13,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:45:13,398 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:45:13,399 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 17:45:13,425 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 17:45:13,488 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 17:45:13,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 17:45:13,489 INFO L262 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 17:45:13,490 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:45:13,507 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:45:13,508 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-08-26 17:45:13,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518977636] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:13,508 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-08-26 17:45:13,508 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 5 [2023-08-26 17:45:13,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705199776] [2023-08-26 17:45:13,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:13,509 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:45:13,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:13,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:45:13,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-08-26 17:45:13,510 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 97 out of 250 [2023-08-26 17:45:13,511 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 74 places, 70 transitions, 536 flow. Second operand has 5 states, 5 states have (on average 99.6) internal successors, (498), 5 states have internal predecessors, (498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:13,512 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:13,512 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 97 of 250 [2023-08-26 17:45:13,512 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:14,105 INFO L124 PetriNetUnfolderBase]: 2648/4781 cut-off events. [2023-08-26 17:45:14,105 INFO L125 PetriNetUnfolderBase]: For 11108/11272 co-relation queries the response was YES. [2023-08-26 17:45:14,124 INFO L83 FinitePrefix]: Finished finitePrefix Result has 16045 conditions, 4781 events. 2648/4781 cut-off events. For 11108/11272 co-relation queries the response was YES. Maximal size of possible extension queue 268. Compared 35140 event pairs, 337 based on Foata normal form. 374/5109 useless extension candidates. Maximal degree in co-relation 16014. Up to 1666 conditions per place. [2023-08-26 17:45:14,142 INFO L140 encePairwiseOnDemand]: 245/250 looper letters, 114 selfloop transitions, 6 changer transitions 1/145 dead transitions. [2023-08-26 17:45:14,142 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 76 places, 145 transitions, 1364 flow [2023-08-26 17:45:14,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 17:45:14,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 17:45:14,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 541 transitions. [2023-08-26 17:45:14,145 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4328 [2023-08-26 17:45:14,145 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 541 transitions. [2023-08-26 17:45:14,145 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 541 transitions. [2023-08-26 17:45:14,145 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:14,145 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 541 transitions. [2023-08-26 17:45:14,146 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 108.2) internal successors, (541), 5 states have internal predecessors, (541), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:14,148 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 250.0) internal successors, (1500), 6 states have internal predecessors, (1500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:14,149 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 250.0) internal successors, (1500), 6 states have internal predecessors, (1500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:14,149 INFO L175 Difference]: Start difference. First operand has 74 places, 70 transitions, 536 flow. Second operand 5 states and 541 transitions. [2023-08-26 17:45:14,149 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 76 places, 145 transitions, 1364 flow [2023-08-26 17:45:14,164 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 145 transitions, 1329 flow, removed 13 selfloop flow, removed 3 redundant places. [2023-08-26 17:45:14,168 INFO L231 Difference]: Finished difference. Result has 74 places, 66 transitions, 506 flow [2023-08-26 17:45:14,168 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=483, PETRI_DIFFERENCE_MINUEND_PLACES=69, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=65, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=59, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=506, PETRI_PLACES=74, PETRI_TRANSITIONS=66} [2023-08-26 17:45:14,168 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 39 predicate places. [2023-08-26 17:45:14,168 INFO L495 AbstractCegarLoop]: Abstraction has has 74 places, 66 transitions, 506 flow [2023-08-26 17:45:14,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 99.6) internal successors, (498), 5 states have internal predecessors, (498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:14,169 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:14,169 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:14,176 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 17:45:14,374 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,SelfDestructingSolverStorable16 [2023-08-26 17:45:14,374 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:14,374 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:14,374 INFO L85 PathProgramCache]: Analyzing trace with hash 1965192319, now seen corresponding path program 1 times [2023-08-26 17:45:14,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:14,374 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595865902] [2023-08-26 17:45:14,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:14,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:14,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:14,424 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:14,424 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:14,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595865902] [2023-08-26 17:45:14,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595865902] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:14,425 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:14,425 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 17:45:14,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248175776] [2023-08-26 17:45:14,425 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:14,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:45:14,425 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:14,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:45:14,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:45:14,426 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 90 out of 250 [2023-08-26 17:45:14,427 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 74 places, 66 transitions, 506 flow. Second operand has 5 states, 5 states have (on average 93.0) internal successors, (465), 5 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:14,427 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:14,427 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 90 of 250 [2023-08-26 17:45:14,427 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:15,340 INFO L124 PetriNetUnfolderBase]: 5387/8913 cut-off events. [2023-08-26 17:45:15,340 INFO L125 PetriNetUnfolderBase]: For 23065/23065 co-relation queries the response was YES. [2023-08-26 17:45:15,378 INFO L83 FinitePrefix]: Finished finitePrefix Result has 32045 conditions, 8913 events. 5387/8913 cut-off events. For 23065/23065 co-relation queries the response was YES. Maximal size of possible extension queue 530. Compared 65748 event pairs, 1538 based on Foata normal form. 180/9085 useless extension candidates. Maximal degree in co-relation 32015. Up to 3486 conditions per place. [2023-08-26 17:45:15,416 INFO L140 encePairwiseOnDemand]: 241/250 looper letters, 105 selfloop transitions, 37 changer transitions 3/148 dead transitions. [2023-08-26 17:45:15,416 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 79 places, 148 transitions, 1390 flow [2023-08-26 17:45:15,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 17:45:15,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 17:45:15,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 617 transitions. [2023-08-26 17:45:15,418 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.41133333333333333 [2023-08-26 17:45:15,419 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 617 transitions. [2023-08-26 17:45:15,419 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 617 transitions. [2023-08-26 17:45:15,419 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:15,419 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 617 transitions. [2023-08-26 17:45:15,420 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 102.83333333333333) internal successors, (617), 6 states have internal predecessors, (617), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:15,422 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 250.0) internal successors, (1750), 7 states have internal predecessors, (1750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:15,423 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 250.0) internal successors, (1750), 7 states have internal predecessors, (1750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:15,423 INFO L175 Difference]: Start difference. First operand has 74 places, 66 transitions, 506 flow. Second operand 6 states and 617 transitions. [2023-08-26 17:45:15,423 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 79 places, 148 transitions, 1390 flow [2023-08-26 17:45:15,474 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 76 places, 148 transitions, 1352 flow, removed 9 selfloop flow, removed 3 redundant places. [2023-08-26 17:45:15,476 INFO L231 Difference]: Finished difference. Result has 80 places, 88 transitions, 833 flow [2023-08-26 17:45:15,476 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=492, PETRI_DIFFERENCE_MINUEND_PLACES=71, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=66, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=18, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=40, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=833, PETRI_PLACES=80, PETRI_TRANSITIONS=88} [2023-08-26 17:45:15,477 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 45 predicate places. [2023-08-26 17:45:15,477 INFO L495 AbstractCegarLoop]: Abstraction has has 80 places, 88 transitions, 833 flow [2023-08-26 17:45:15,477 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 93.0) internal successors, (465), 5 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:15,477 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:15,477 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:15,478 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-08-26 17:45:15,478 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:15,479 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:15,479 INFO L85 PathProgramCache]: Analyzing trace with hash 807898313, now seen corresponding path program 2 times [2023-08-26 17:45:15,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:15,479 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113386542] [2023-08-26 17:45:15,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:15,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:15,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:15,533 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:15,533 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:15,534 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113386542] [2023-08-26 17:45:15,534 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113386542] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:15,534 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:15,534 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 17:45:15,534 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407468333] [2023-08-26 17:45:15,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:15,534 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:45:15,534 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:15,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:45:15,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:45:15,535 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 90 out of 250 [2023-08-26 17:45:15,536 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 80 places, 88 transitions, 833 flow. Second operand has 5 states, 5 states have (on average 93.0) internal successors, (465), 5 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:15,536 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:15,536 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 90 of 250 [2023-08-26 17:45:15,536 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:16,777 INFO L124 PetriNetUnfolderBase]: 6708/11208 cut-off events. [2023-08-26 17:45:16,777 INFO L125 PetriNetUnfolderBase]: For 38062/38062 co-relation queries the response was YES. [2023-08-26 17:45:16,815 INFO L83 FinitePrefix]: Finished finitePrefix Result has 43920 conditions, 11208 events. 6708/11208 cut-off events. For 38062/38062 co-relation queries the response was YES. Maximal size of possible extension queue 714. Compared 87651 event pairs, 3551 based on Foata normal form. 136/11338 useless extension candidates. Maximal degree in co-relation 43887. Up to 7584 conditions per place. [2023-08-26 17:45:16,860 INFO L140 encePairwiseOnDemand]: 241/250 looper letters, 134 selfloop transitions, 69 changer transitions 3/209 dead transitions. [2023-08-26 17:45:16,861 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 86 places, 209 transitions, 2352 flow [2023-08-26 17:45:16,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 17:45:16,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 17:45:16,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 712 transitions. [2023-08-26 17:45:16,863 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.40685714285714286 [2023-08-26 17:45:16,863 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 712 transitions. [2023-08-26 17:45:16,863 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 712 transitions. [2023-08-26 17:45:16,864 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:16,864 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 712 transitions. [2023-08-26 17:45:16,865 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 101.71428571428571) internal successors, (712), 7 states have internal predecessors, (712), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:16,867 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 250.0) internal successors, (2000), 8 states have internal predecessors, (2000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:16,868 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 250.0) internal successors, (2000), 8 states have internal predecessors, (2000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:16,868 INFO L175 Difference]: Start difference. First operand has 80 places, 88 transitions, 833 flow. Second operand 7 states and 712 transitions. [2023-08-26 17:45:16,868 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 86 places, 209 transitions, 2352 flow [2023-08-26 17:45:16,970 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 86 places, 209 transitions, 2332 flow, removed 10 selfloop flow, removed 0 redundant places. [2023-08-26 17:45:16,973 INFO L231 Difference]: Finished difference. Result has 91 places, 140 transitions, 1722 flow [2023-08-26 17:45:16,973 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=823, PETRI_DIFFERENCE_MINUEND_PLACES=80, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=88, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=23, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=36, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=1722, PETRI_PLACES=91, PETRI_TRANSITIONS=140} [2023-08-26 17:45:16,973 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 56 predicate places. [2023-08-26 17:45:16,973 INFO L495 AbstractCegarLoop]: Abstraction has has 91 places, 140 transitions, 1722 flow [2023-08-26 17:45:16,974 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 93.0) internal successors, (465), 5 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:16,974 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:16,974 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:16,974 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-08-26 17:45:16,974 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:16,974 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:16,974 INFO L85 PathProgramCache]: Analyzing trace with hash 691328911, now seen corresponding path program 1 times [2023-08-26 17:45:16,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:16,975 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146956837] [2023-08-26 17:45:16,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:16,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:16,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:17,111 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:17,112 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:17,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146956837] [2023-08-26 17:45:17,112 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2146956837] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:17,112 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:17,112 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 17:45:17,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975255082] [2023-08-26 17:45:17,112 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:17,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:45:17,113 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:17,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:45:17,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:45:17,114 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 90 out of 250 [2023-08-26 17:45:17,115 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 91 places, 140 transitions, 1722 flow. Second operand has 5 states, 5 states have (on average 93.0) internal successors, (465), 5 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:17,115 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:17,115 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 90 of 250 [2023-08-26 17:45:17,115 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:18,642 INFO L124 PetriNetUnfolderBase]: 7760/13036 cut-off events. [2023-08-26 17:45:18,642 INFO L125 PetriNetUnfolderBase]: For 59316/59316 co-relation queries the response was YES. [2023-08-26 17:45:18,686 INFO L83 FinitePrefix]: Finished finitePrefix Result has 55600 conditions, 13036 events. 7760/13036 cut-off events. For 59316/59316 co-relation queries the response was YES. Maximal size of possible extension queue 845. Compared 106026 event pairs, 2222 based on Foata normal form. 108/13138 useless extension candidates. Maximal degree in co-relation 55561. Up to 6716 conditions per place. [2023-08-26 17:45:18,747 INFO L140 encePairwiseOnDemand]: 241/250 looper letters, 183 selfloop transitions, 46 changer transitions 3/235 dead transitions. [2023-08-26 17:45:18,747 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 96 places, 235 transitions, 3068 flow [2023-08-26 17:45:18,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 17:45:18,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 17:45:18,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 615 transitions. [2023-08-26 17:45:18,752 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.41 [2023-08-26 17:45:18,752 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 615 transitions. [2023-08-26 17:45:18,753 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 615 transitions. [2023-08-26 17:45:18,753 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:18,753 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 615 transitions. [2023-08-26 17:45:18,754 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 102.5) internal successors, (615), 6 states have internal predecessors, (615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:18,757 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 250.0) internal successors, (1750), 7 states have internal predecessors, (1750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:18,757 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 250.0) internal successors, (1750), 7 states have internal predecessors, (1750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:18,757 INFO L175 Difference]: Start difference. First operand has 91 places, 140 transitions, 1722 flow. Second operand 6 states and 615 transitions. [2023-08-26 17:45:18,757 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 96 places, 235 transitions, 3068 flow [2023-08-26 17:45:19,087 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 96 places, 235 transitions, 3034 flow, removed 17 selfloop flow, removed 0 redundant places. [2023-08-26 17:45:19,090 INFO L231 Difference]: Finished difference. Result has 100 places, 155 transitions, 2033 flow [2023-08-26 17:45:19,091 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=1690, PETRI_DIFFERENCE_MINUEND_PLACES=91, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=140, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=34, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=102, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=2033, PETRI_PLACES=100, PETRI_TRANSITIONS=155} [2023-08-26 17:45:19,091 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 65 predicate places. [2023-08-26 17:45:19,091 INFO L495 AbstractCegarLoop]: Abstraction has has 100 places, 155 transitions, 2033 flow [2023-08-26 17:45:19,091 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 93.0) internal successors, (465), 5 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:19,091 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:19,091 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:19,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2023-08-26 17:45:19,092 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:19,092 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:19,092 INFO L85 PathProgramCache]: Analyzing trace with hash -389524289, now seen corresponding path program 2 times [2023-08-26 17:45:19,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:19,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514737366] [2023-08-26 17:45:19,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:19,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:19,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:19,137 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:19,137 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:19,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514737366] [2023-08-26 17:45:19,138 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514737366] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:19,138 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:19,138 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 17:45:19,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463469102] [2023-08-26 17:45:19,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:19,138 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:45:19,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:19,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:45:19,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:45:19,140 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 90 out of 250 [2023-08-26 17:45:19,140 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 100 places, 155 transitions, 2033 flow. Second operand has 5 states, 5 states have (on average 93.0) internal successors, (465), 5 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:19,140 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:19,140 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 90 of 250 [2023-08-26 17:45:19,140 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:21,052 INFO L124 PetriNetUnfolderBase]: 9182/15538 cut-off events. [2023-08-26 17:45:21,052 INFO L125 PetriNetUnfolderBase]: For 88478/88478 co-relation queries the response was YES. [2023-08-26 17:45:21,118 INFO L83 FinitePrefix]: Finished finitePrefix Result has 71012 conditions, 15538 events. 9182/15538 cut-off events. For 88478/88478 co-relation queries the response was YES. Maximal size of possible extension queue 1021. Compared 130391 event pairs, 5494 based on Foata normal form. 108/15639 useless extension candidates. Maximal degree in co-relation 70969. Up to 12309 conditions per place. [2023-08-26 17:45:21,174 INFO L140 encePairwiseOnDemand]: 241/250 looper letters, 187 selfloop transitions, 54 changer transitions 2/246 dead transitions. [2023-08-26 17:45:21,174 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 106 places, 246 transitions, 3394 flow [2023-08-26 17:45:21,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 17:45:21,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 17:45:21,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 706 transitions. [2023-08-26 17:45:21,176 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4034285714285714 [2023-08-26 17:45:21,176 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 706 transitions. [2023-08-26 17:45:21,176 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 706 transitions. [2023-08-26 17:45:21,177 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:21,177 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 706 transitions. [2023-08-26 17:45:21,178 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 100.85714285714286) internal successors, (706), 7 states have internal predecessors, (706), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:21,180 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 250.0) internal successors, (2000), 8 states have internal predecessors, (2000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:21,181 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 250.0) internal successors, (2000), 8 states have internal predecessors, (2000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:21,181 INFO L175 Difference]: Start difference. First operand has 100 places, 155 transitions, 2033 flow. Second operand 7 states and 706 transitions. [2023-08-26 17:45:21,181 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 106 places, 246 transitions, 3394 flow [2023-08-26 17:45:21,549 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 106 places, 246 transitions, 3358 flow, removed 18 selfloop flow, removed 0 redundant places. [2023-08-26 17:45:21,552 INFO L231 Difference]: Finished difference. Result has 111 places, 195 transitions, 2753 flow [2023-08-26 17:45:21,552 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=2017, PETRI_DIFFERENCE_MINUEND_PLACES=100, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=155, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=20, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=118, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=2753, PETRI_PLACES=111, PETRI_TRANSITIONS=195} [2023-08-26 17:45:21,552 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 76 predicate places. [2023-08-26 17:45:21,553 INFO L495 AbstractCegarLoop]: Abstraction has has 111 places, 195 transitions, 2753 flow [2023-08-26 17:45:21,553 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 93.0) internal successors, (465), 5 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:21,553 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:21,553 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:21,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2023-08-26 17:45:21,553 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:21,554 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:21,554 INFO L85 PathProgramCache]: Analyzing trace with hash 2027782770, now seen corresponding path program 1 times [2023-08-26 17:45:21,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:21,554 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1319065526] [2023-08-26 17:45:21,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:21,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:21,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:21,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-08-26 17:45:21,620 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:21,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1319065526] [2023-08-26 17:45:21,621 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1319065526] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:21,621 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:21,621 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 17:45:21,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234828422] [2023-08-26 17:45:21,621 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:21,621 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:45:21,622 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:21,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:45:21,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:45:21,622 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 106 out of 250 [2023-08-26 17:45:21,623 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 111 places, 195 transitions, 2753 flow. Second operand has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:21,623 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:21,623 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 106 of 250 [2023-08-26 17:45:21,623 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:22,486 INFO L124 PetriNetUnfolderBase]: 3413/6520 cut-off events. [2023-08-26 17:45:22,486 INFO L125 PetriNetUnfolderBase]: For 40277/40313 co-relation queries the response was YES. [2023-08-26 17:45:22,514 INFO L83 FinitePrefix]: Finished finitePrefix Result has 30731 conditions, 6520 events. 3413/6520 cut-off events. For 40277/40313 co-relation queries the response was YES. Maximal size of possible extension queue 434. Compared 52284 event pairs, 1771 based on Foata normal form. 164/6655 useless extension candidates. Maximal degree in co-relation 30682. Up to 4076 conditions per place. [2023-08-26 17:45:22,534 INFO L140 encePairwiseOnDemand]: 246/250 looper letters, 101 selfloop transitions, 14 changer transitions 0/156 dead transitions. [2023-08-26 17:45:22,534 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 111 places, 156 transitions, 2135 flow [2023-08-26 17:45:22,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:22,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:22,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 348 transitions. [2023-08-26 17:45:22,535 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.464 [2023-08-26 17:45:22,536 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 348 transitions. [2023-08-26 17:45:22,536 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 348 transitions. [2023-08-26 17:45:22,536 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:22,536 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 348 transitions. [2023-08-26 17:45:22,537 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 116.0) internal successors, (348), 3 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:22,538 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:22,538 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 250.0) internal successors, (1000), 4 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:22,538 INFO L175 Difference]: Start difference. First operand has 111 places, 195 transitions, 2753 flow. Second operand 3 states and 348 transitions. [2023-08-26 17:45:22,539 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 111 places, 156 transitions, 2135 flow [2023-08-26 17:45:22,641 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 105 places, 156 transitions, 1934 flow, removed 55 selfloop flow, removed 6 redundant places. [2023-08-26 17:45:22,643 INFO L231 Difference]: Finished difference. Result has 105 places, 118 transitions, 1366 flow [2023-08-26 17:45:22,643 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=1338, PETRI_DIFFERENCE_MINUEND_PLACES=103, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=118, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=14, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=104, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=1366, PETRI_PLACES=105, PETRI_TRANSITIONS=118} [2023-08-26 17:45:22,644 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 70 predicate places. [2023-08-26 17:45:22,644 INFO L495 AbstractCegarLoop]: Abstraction has has 105 places, 118 transitions, 1366 flow [2023-08-26 17:45:22,644 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:22,644 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:22,644 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:22,644 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-08-26 17:45:22,645 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-08-26 17:45:22,645 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:22,645 INFO L85 PathProgramCache]: Analyzing trace with hash 912255471, now seen corresponding path program 1 times [2023-08-26 17:45:22,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:22,645 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1983469844] [2023-08-26 17:45:22,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:22,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:22,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:22,721 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:22,721 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:22,721 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1983469844] [2023-08-26 17:45:22,721 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1983469844] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:22,721 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:22,721 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 17:45:22,722 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2819668] [2023-08-26 17:45:22,722 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:22,722 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:45:22,722 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:22,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:45:22,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:45:22,723 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 97 out of 250 [2023-08-26 17:45:22,724 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 105 places, 118 transitions, 1366 flow. Second operand has 5 states, 5 states have (on average 99.8) internal successors, (499), 5 states have internal predecessors, (499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:22,724 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:22,724 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 97 of 250 [2023-08-26 17:45:22,724 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:23,294 INFO L124 PetriNetUnfolderBase]: 2655/5105 cut-off events. [2023-08-26 17:45:23,294 INFO L125 PetriNetUnfolderBase]: For 24295/24326 co-relation queries the response was YES. [2023-08-26 17:45:23,314 INFO L83 FinitePrefix]: Finished finitePrefix Result has 22154 conditions, 5105 events. 2655/5105 cut-off events. For 24295/24326 co-relation queries the response was YES. Maximal size of possible extension queue 370. Compared 40745 event pairs, 261 based on Foata normal form. 448/5525 useless extension candidates. Maximal degree in co-relation 22108. Up to 1868 conditions per place. [2023-08-26 17:45:23,317 INFO L140 encePairwiseOnDemand]: 245/250 looper letters, 0 selfloop transitions, 0 changer transitions 166/166 dead transitions. [2023-08-26 17:45:23,317 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 107 places, 166 transitions, 2001 flow [2023-08-26 17:45:23,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 17:45:23,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 17:45:23,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 530 transitions. [2023-08-26 17:45:23,319 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.424 [2023-08-26 17:45:23,319 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 530 transitions. [2023-08-26 17:45:23,319 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 530 transitions. [2023-08-26 17:45:23,319 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:23,319 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 530 transitions. [2023-08-26 17:45:23,321 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 106.0) internal successors, (530), 5 states have internal predecessors, (530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:23,322 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 250.0) internal successors, (1500), 6 states have internal predecessors, (1500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:23,323 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 250.0) internal successors, (1500), 6 states have internal predecessors, (1500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:23,323 INFO L175 Difference]: Start difference. First operand has 105 places, 118 transitions, 1366 flow. Second operand 5 states and 530 transitions. [2023-08-26 17:45:23,323 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 107 places, 166 transitions, 2001 flow [2023-08-26 17:45:23,377 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 99 places, 166 transitions, 1843 flow, removed 2 selfloop flow, removed 8 redundant places. [2023-08-26 17:45:23,379 INFO L231 Difference]: Finished difference. Result has 99 places, 0 transitions, 0 flow [2023-08-26 17:45:23,379 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=250, PETRI_DIFFERENCE_MINUEND_FLOW=1162, PETRI_DIFFERENCE_MINUEND_PLACES=95, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=112, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=112, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=99, PETRI_TRANSITIONS=0} [2023-08-26 17:45:23,379 INFO L281 CegarLoopForPetriNet]: 35 programPoint places, 64 predicate places. [2023-08-26 17:45:23,379 INFO L495 AbstractCegarLoop]: Abstraction has has 99 places, 0 transitions, 0 flow [2023-08-26 17:45:23,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 99.8) internal successors, (499), 5 states have internal predecessors, (499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:23,380 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 11 remaining) [2023-08-26 17:45:23,380 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 11 remaining) [2023-08-26 17:45:23,380 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 11 remaining) [2023-08-26 17:45:23,380 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 11 remaining) [2023-08-26 17:45:23,380 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 11 remaining) [2023-08-26 17:45:23,380 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err2ASSERT_VIOLATIONASSERT (5 of 11 remaining) [2023-08-26 17:45:23,380 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err2ASSERT_VIOLATIONASSERT (4 of 11 remaining) [2023-08-26 17:45:23,380 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 11 remaining) [2023-08-26 17:45:23,381 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err2ASSERT_VIOLATIONASSERT (2 of 11 remaining) [2023-08-26 17:45:23,381 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 11 remaining) [2023-08-26 17:45:23,381 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 11 remaining) [2023-08-26 17:45:23,381 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2023-08-26 17:45:23,381 INFO L445 BasicCegarLoop]: Path program histogram: [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:23,382 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 17:45:23,383 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 117 places, 125 transitions, 262 flow [2023-08-26 17:45:23,394 INFO L124 PetriNetUnfolderBase]: 15/151 cut-off events. [2023-08-26 17:45:23,394 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:45:23,395 INFO L83 FinitePrefix]: Finished finitePrefix Result has 161 conditions, 151 events. 15/151 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 288 event pairs, 0 based on Foata normal form. 0/121 useless extension candidates. Maximal degree in co-relation 102. Up to 6 conditions per place. [2023-08-26 17:45:23,395 INFO L82 GeneralOperation]: Start removeDead. Operand has 117 places, 125 transitions, 262 flow [2023-08-26 17:45:23,396 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 117 places, 125 transitions, 262 flow [2023-08-26 17:45:23,396 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:45:23,396 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 117 places, 125 transitions, 262 flow [2023-08-26 17:45:23,396 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 117 places, 125 transitions, 262 flow [2023-08-26 17:45:23,396 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 117 places, 125 transitions, 262 flow [2023-08-26 17:45:23,407 INFO L124 PetriNetUnfolderBase]: 15/151 cut-off events. [2023-08-26 17:45:23,407 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:45:23,407 INFO L83 FinitePrefix]: Finished finitePrefix Result has 161 conditions, 151 events. 15/151 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 288 event pairs, 0 based on Foata normal form. 0/121 useless extension candidates. Maximal degree in co-relation 102. Up to 6 conditions per place. [2023-08-26 17:45:23,410 INFO L119 LiptonReduction]: Number of co-enabled transitions 6600 [2023-08-26 17:45:25,439 INFO L134 LiptonReduction]: Checked pairs total: 11621 [2023-08-26 17:45:25,439 INFO L136 LiptonReduction]: Total number of compositions: 125 [2023-08-26 17:45:25,440 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 17:45:25,440 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;@6686ae92, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:45:25,440 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 17:45:25,443 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:45:25,444 INFO L124 PetriNetUnfolderBase]: 2/37 cut-off events. [2023-08-26 17:45:25,444 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:45:25,444 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:25,444 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 17:45:25,444 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 17:45:25,444 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:25,444 INFO L85 PathProgramCache]: Analyzing trace with hash 707397078, now seen corresponding path program 1 times [2023-08-26 17:45:25,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:25,445 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377025698] [2023-08-26 17:45:25,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:25,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:25,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:45:25,454 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 17:45:25,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:45:25,465 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 17:45:25,465 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 17:45:25,465 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 17:45:25,466 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2023-08-26 17:45:25,466 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 17:45:25,466 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 17:45:25,466 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 17:45:25,466 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 17:45:25,490 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:45:25,492 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 170 transitions, 361 flow [2023-08-26 17:45:25,512 INFO L124 PetriNetUnfolderBase]: 22/210 cut-off events. [2023-08-26 17:45:25,512 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:45:25,513 INFO L83 FinitePrefix]: Finished finitePrefix Result has 226 conditions, 210 events. 22/210 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 535 event pairs, 0 based on Foata normal form. 0/167 useless extension candidates. Maximal degree in co-relation 155. Up to 8 conditions per place. [2023-08-26 17:45:25,514 INFO L82 GeneralOperation]: Start removeDead. Operand has 158 places, 170 transitions, 361 flow [2023-08-26 17:45:25,518 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 158 places, 170 transitions, 361 flow [2023-08-26 17:45:25,518 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:45:25,518 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 158 places, 170 transitions, 361 flow [2023-08-26 17:45:25,519 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 158 places, 170 transitions, 361 flow [2023-08-26 17:45:25,519 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 170 transitions, 361 flow [2023-08-26 17:45:25,538 INFO L124 PetriNetUnfolderBase]: 22/210 cut-off events. [2023-08-26 17:45:25,539 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:45:25,540 INFO L83 FinitePrefix]: Finished finitePrefix Result has 226 conditions, 210 events. 22/210 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 535 event pairs, 0 based on Foata normal form. 0/167 useless extension candidates. Maximal degree in co-relation 155. Up to 8 conditions per place. [2023-08-26 17:45:25,548 INFO L119 LiptonReduction]: Number of co-enabled transitions 15840 [2023-08-26 17:45:28,028 INFO L134 LiptonReduction]: Checked pairs total: 26997 [2023-08-26 17:45:28,028 INFO L136 LiptonReduction]: Total number of compositions: 175 [2023-08-26 17:45:28,029 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:45:28,030 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;@6686ae92, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:45:28,030 INFO L358 AbstractCegarLoop]: Starting to check reachability of 14 error locations. [2023-08-26 17:45:28,031 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:45:28,031 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 17:45:28,031 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:45:28,031 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:28,031 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:45:28,031 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:45:28,031 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:28,031 INFO L85 PathProgramCache]: Analyzing trace with hash 41358, now seen corresponding path program 1 times [2023-08-26 17:45:28,031 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:28,031 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927320214] [2023-08-26 17:45:28,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:28,032 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:28,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:28,050 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 17:45:28,050 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:28,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927320214] [2023-08-26 17:45:28,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927320214] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:28,051 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:28,051 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:45:28,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701497862] [2023-08-26 17:45:28,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:28,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:45:28,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:28,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:45:28,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:45:28,052 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 127 out of 345 [2023-08-26 17:45:28,053 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 47 transitions, 115 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 17:45:28,053 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:28,053 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 127 of 345 [2023-08-26 17:45:28,053 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:28,592 INFO L124 PetriNetUnfolderBase]: 6619/9859 cut-off events. [2023-08-26 17:45:28,593 INFO L125 PetriNetUnfolderBase]: For 703/703 co-relation queries the response was YES. [2023-08-26 17:45:28,608 INFO L83 FinitePrefix]: Finished finitePrefix Result has 19239 conditions, 9859 events. 6619/9859 cut-off events. For 703/703 co-relation queries the response was YES. Maximal size of possible extension queue 692. Compared 63624 event pairs, 5560 based on Foata normal form. 0/5521 useless extension candidates. Maximal degree in co-relation 1591. Up to 8806 conditions per place. [2023-08-26 17:45:28,641 INFO L140 encePairwiseOnDemand]: 342/345 looper letters, 32 selfloop transitions, 1 changer transitions 0/45 dead transitions. [2023-08-26 17:45:28,641 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 48 places, 45 transitions, 177 flow [2023-08-26 17:45:28,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:28,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:28,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 416 transitions. [2023-08-26 17:45:28,642 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.40193236714975844 [2023-08-26 17:45:28,643 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 416 transitions. [2023-08-26 17:45:28,643 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 416 transitions. [2023-08-26 17:45:28,643 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:28,643 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 416 transitions. [2023-08-26 17:45:28,644 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 138.66666666666666) internal successors, (416), 3 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:28,645 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 345.0) internal successors, (1380), 4 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:28,645 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 345.0) internal successors, (1380), 4 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:28,646 INFO L175 Difference]: Start difference. First operand has 48 places, 47 transitions, 115 flow. Second operand 3 states and 416 transitions. [2023-08-26 17:45:28,646 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 48 places, 45 transitions, 177 flow [2023-08-26 17:45:28,647 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 48 places, 45 transitions, 171 flow, removed 3 selfloop flow, removed 0 redundant places. [2023-08-26 17:45:28,647 INFO L231 Difference]: Finished difference. Result has 48 places, 45 transitions, 107 flow [2023-08-26 17:45:28,647 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=105, PETRI_DIFFERENCE_MINUEND_PLACES=46, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=45, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=44, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=107, PETRI_PLACES=48, PETRI_TRANSITIONS=45} [2023-08-26 17:45:28,648 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 0 predicate places. [2023-08-26 17:45:28,648 INFO L495 AbstractCegarLoop]: Abstraction has has 48 places, 45 transitions, 107 flow [2023-08-26 17:45:28,648 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 17:45:28,648 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:28,648 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:45:28,648 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2023-08-26 17:45:28,648 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:45:28,649 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:28,649 INFO L85 PathProgramCache]: Analyzing trace with hash 41359, now seen corresponding path program 1 times [2023-08-26 17:45:28,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:28,649 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692347201] [2023-08-26 17:45:28,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:28,649 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:28,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:28,671 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 17:45:28,671 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:28,671 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692347201] [2023-08-26 17:45:28,671 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692347201] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:28,672 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:28,672 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:45:28,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247961773] [2023-08-26 17:45:28,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:28,672 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:45:28,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:28,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:45:28,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:45:28,673 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 128 out of 345 [2023-08-26 17:45:28,674 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 45 transitions, 107 flow. Second operand has 3 states, 3 states have (on average 128.66666666666666) internal successors, (386), 3 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:28,674 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:28,674 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 128 of 345 [2023-08-26 17:45:28,674 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:29,105 INFO L124 PetriNetUnfolderBase]: 4170/6408 cut-off events. [2023-08-26 17:45:29,105 INFO L125 PetriNetUnfolderBase]: For 252/252 co-relation queries the response was YES. [2023-08-26 17:45:29,119 INFO L83 FinitePrefix]: Finished finitePrefix Result has 12387 conditions, 6408 events. 4170/6408 cut-off events. For 252/252 co-relation queries the response was YES. Maximal size of possible extension queue 430. Compared 39673 event pairs, 3464 based on Foata normal form. 0/4029 useless extension candidates. Maximal degree in co-relation 12378. Up to 5628 conditions per place. [2023-08-26 17:45:29,144 INFO L140 encePairwiseOnDemand]: 343/345 looper letters, 31 selfloop transitions, 1 changer transitions 0/44 dead transitions. [2023-08-26 17:45:29,144 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 44 transitions, 169 flow [2023-08-26 17:45:29,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:29,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:29,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 417 transitions. [2023-08-26 17:45:29,145 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4028985507246377 [2023-08-26 17:45:29,145 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 417 transitions. [2023-08-26 17:45:29,146 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 417 transitions. [2023-08-26 17:45:29,146 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:29,146 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 417 transitions. [2023-08-26 17:45:29,147 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 139.0) internal successors, (417), 3 states have internal predecessors, (417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:29,148 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 345.0) internal successors, (1380), 4 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:29,148 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 345.0) internal successors, (1380), 4 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:29,148 INFO L175 Difference]: Start difference. First operand has 48 places, 45 transitions, 107 flow. Second operand 3 states and 417 transitions. [2023-08-26 17:45:29,149 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 44 transitions, 169 flow [2023-08-26 17:45:29,149 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 48 places, 44 transitions, 168 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:45:29,150 INFO L231 Difference]: Finished difference. Result has 48 places, 44 transitions, 106 flow [2023-08-26 17:45:29,150 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=104, PETRI_DIFFERENCE_MINUEND_PLACES=46, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=44, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=43, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=106, PETRI_PLACES=48, PETRI_TRANSITIONS=44} [2023-08-26 17:45:29,150 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 0 predicate places. [2023-08-26 17:45:29,150 INFO L495 AbstractCegarLoop]: Abstraction has has 48 places, 44 transitions, 106 flow [2023-08-26 17:45:29,151 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 128.66666666666666) internal successors, (386), 3 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:29,151 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:29,151 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 17:45:29,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2023-08-26 17:45:29,151 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:45:29,151 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:29,151 INFO L85 PathProgramCache]: Analyzing trace with hash 1233155089, now seen corresponding path program 1 times [2023-08-26 17:45:29,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:29,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289498461] [2023-08-26 17:45:29,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:29,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:29,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:29,197 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 17:45:29,197 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:29,197 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289498461] [2023-08-26 17:45:29,198 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1289498461] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:29,198 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:29,198 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:29,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163311287] [2023-08-26 17:45:29,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:29,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 17:45:29,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:29,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 17:45:29,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 17:45:29,200 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 117 out of 345 [2023-08-26 17:45:29,200 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 44 transitions, 106 flow. Second operand has 4 states, 4 states have (on average 118.25) internal successors, (473), 4 states have internal predecessors, (473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:29,201 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:29,201 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 117 of 345 [2023-08-26 17:45:29,201 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:29,543 INFO L124 PetriNetUnfolderBase]: 2979/4625 cut-off events. [2023-08-26 17:45:29,543 INFO L125 PetriNetUnfolderBase]: For 200/200 co-relation queries the response was YES. [2023-08-26 17:45:29,553 INFO L83 FinitePrefix]: Finished finitePrefix Result has 8910 conditions, 4625 events. 2979/4625 cut-off events. For 200/200 co-relation queries the response was YES. Maximal size of possible extension queue 283. Compared 27199 event pairs, 2415 based on Foata normal form. 0/3143 useless extension candidates. Maximal degree in co-relation 8900. Up to 4003 conditions per place. [2023-08-26 17:45:29,566 INFO L140 encePairwiseOnDemand]: 341/345 looper letters, 28 selfloop transitions, 1 changer transitions 0/41 dead transitions. [2023-08-26 17:45:29,566 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 47 places, 41 transitions, 158 flow [2023-08-26 17:45:29,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:29,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:29,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 383 transitions. [2023-08-26 17:45:29,567 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.370048309178744 [2023-08-26 17:45:29,568 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 383 transitions. [2023-08-26 17:45:29,568 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 383 transitions. [2023-08-26 17:45:29,568 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:29,568 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 383 transitions. [2023-08-26 17:45:29,568 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 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 17:45:29,570 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 345.0) internal successors, (1380), 4 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:29,570 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 345.0) internal successors, (1380), 4 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:29,570 INFO L175 Difference]: Start difference. First operand has 48 places, 44 transitions, 106 flow. Second operand 3 states and 383 transitions. [2023-08-26 17:45:29,570 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 47 places, 41 transitions, 158 flow [2023-08-26 17:45:29,571 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 46 places, 41 transitions, 157 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:45:29,571 INFO L231 Difference]: Finished difference. Result has 46 places, 41 transitions, 101 flow [2023-08-26 17:45:29,571 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=99, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=40, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=101, PETRI_PLACES=46, PETRI_TRANSITIONS=41} [2023-08-26 17:45:29,572 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, -2 predicate places. [2023-08-26 17:45:29,572 INFO L495 AbstractCegarLoop]: Abstraction has has 46 places, 41 transitions, 101 flow [2023-08-26 17:45:29,572 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 118.25) internal successors, (473), 4 states have internal predecessors, (473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:29,572 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:29,572 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 17:45:29,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2023-08-26 17:45:29,573 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:45:29,573 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:29,573 INFO L85 PathProgramCache]: Analyzing trace with hash 1233155090, now seen corresponding path program 1 times [2023-08-26 17:45:29,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:29,573 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459432056] [2023-08-26 17:45:29,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:29,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:29,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:29,653 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 17:45:29,653 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:29,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459432056] [2023-08-26 17:45:29,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1459432056] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:29,654 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:29,654 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:29,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793772071] [2023-08-26 17:45:29,654 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:29,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 17:45:29,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:29,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 17:45:29,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 17:45:29,655 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 114 out of 345 [2023-08-26 17:45:29,667 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 46 places, 41 transitions, 101 flow. Second operand has 4 states, 4 states have (on average 115.25) internal successors, (461), 4 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:29,667 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:29,667 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 114 of 345 [2023-08-26 17:45:29,667 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:30,189 INFO L124 PetriNetUnfolderBase]: 4849/7352 cut-off events. [2023-08-26 17:45:30,189 INFO L125 PetriNetUnfolderBase]: For 345/345 co-relation queries the response was YES. [2023-08-26 17:45:30,202 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14252 conditions, 7352 events. 4849/7352 cut-off events. For 345/345 co-relation queries the response was YES. Maximal size of possible extension queue 378. Compared 45196 event pairs, 2425 based on Foata normal form. 0/5120 useless extension candidates. Maximal degree in co-relation 14241. Up to 4003 conditions per place. [2023-08-26 17:45:30,225 INFO L140 encePairwiseOnDemand]: 340/345 looper letters, 50 selfloop transitions, 3 changer transitions 0/65 dead transitions. [2023-08-26 17:45:30,225 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 65 transitions, 265 flow [2023-08-26 17:45:30,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 17:45:30,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 17:45:30,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 511 transitions. [2023-08-26 17:45:30,226 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.37028985507246376 [2023-08-26 17:45:30,226 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 511 transitions. [2023-08-26 17:45:30,227 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 511 transitions. [2023-08-26 17:45:30,227 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:30,227 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 511 transitions. [2023-08-26 17:45:30,228 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 127.75) internal successors, (511), 4 states have internal predecessors, (511), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:30,230 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 345.0) internal successors, (1725), 5 states have internal predecessors, (1725), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:30,230 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 345.0) internal successors, (1725), 5 states have internal predecessors, (1725), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:30,231 INFO L175 Difference]: Start difference. First operand has 46 places, 41 transitions, 101 flow. Second operand 4 states and 511 transitions. [2023-08-26 17:45:30,231 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 65 transitions, 265 flow [2023-08-26 17:45:30,231 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 48 places, 65 transitions, 264 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:45:30,232 INFO L231 Difference]: Finished difference. Result has 49 places, 42 transitions, 116 flow [2023-08-26 17:45:30,232 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=100, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=38, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=116, PETRI_PLACES=49, PETRI_TRANSITIONS=42} [2023-08-26 17:45:30,233 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 1 predicate places. [2023-08-26 17:45:30,233 INFO L495 AbstractCegarLoop]: Abstraction has has 49 places, 42 transitions, 116 flow [2023-08-26 17:45:30,233 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 115.25) internal successors, (461), 4 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:30,233 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:30,233 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:30,233 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2023-08-26 17:45:30,233 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:45:30,234 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:30,234 INFO L85 PathProgramCache]: Analyzing trace with hash -1738101954, now seen corresponding path program 1 times [2023-08-26 17:45:30,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:30,234 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [581383875] [2023-08-26 17:45:30,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:30,234 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:30,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:30,320 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:30,320 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:30,320 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [581383875] [2023-08-26 17:45:30,320 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [581383875] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:30,320 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:30,320 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:30,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357193818] [2023-08-26 17:45:30,320 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:30,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 17:45:30,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:30,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 17:45:30,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 17:45:30,322 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 115 out of 345 [2023-08-26 17:45:30,322 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 42 transitions, 116 flow. Second operand has 4 states, 4 states have (on average 116.5) internal successors, (466), 4 states have internal predecessors, (466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:30,322 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:30,322 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 115 of 345 [2023-08-26 17:45:30,323 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:30,946 INFO L124 PetriNetUnfolderBase]: 5989/8931 cut-off events. [2023-08-26 17:45:30,947 INFO L125 PetriNetUnfolderBase]: For 1493/1493 co-relation queries the response was YES. [2023-08-26 17:45:30,963 INFO L83 FinitePrefix]: Finished finitePrefix Result has 18606 conditions, 8931 events. 5989/8931 cut-off events. For 1493/1493 co-relation queries the response was YES. Maximal size of possible extension queue 424. Compared 55901 event pairs, 2059 based on Foata normal form. 0/6683 useless extension candidates. Maximal degree in co-relation 18593. Up to 5070 conditions per place. [2023-08-26 17:45:30,992 INFO L140 encePairwiseOnDemand]: 340/345 looper letters, 47 selfloop transitions, 4 changer transitions 0/63 dead transitions. [2023-08-26 17:45:30,992 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 52 places, 63 transitions, 277 flow [2023-08-26 17:45:30,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 17:45:30,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 17:45:30,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 510 transitions. [2023-08-26 17:45:30,993 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3695652173913043 [2023-08-26 17:45:30,993 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 510 transitions. [2023-08-26 17:45:30,994 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 510 transitions. [2023-08-26 17:45:30,994 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:30,994 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 510 transitions. [2023-08-26 17:45:30,995 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 127.5) internal successors, (510), 4 states have internal predecessors, (510), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:30,997 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 345.0) internal successors, (1725), 5 states have internal predecessors, (1725), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:30,997 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 345.0) internal successors, (1725), 5 states have internal predecessors, (1725), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:30,997 INFO L175 Difference]: Start difference. First operand has 49 places, 42 transitions, 116 flow. Second operand 4 states and 510 transitions. [2023-08-26 17:45:30,997 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 52 places, 63 transitions, 277 flow [2023-08-26 17:45:30,998 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 50 places, 63 transitions, 271 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 17:45:30,999 INFO L231 Difference]: Finished difference. Result has 52 places, 43 transitions, 133 flow [2023-08-26 17:45:30,999 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=112, PETRI_DIFFERENCE_MINUEND_PLACES=47, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=42, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=38, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=133, PETRI_PLACES=52, PETRI_TRANSITIONS=43} [2023-08-26 17:45:30,999 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 4 predicate places. [2023-08-26 17:45:31,000 INFO L495 AbstractCegarLoop]: Abstraction has has 52 places, 43 transitions, 133 flow [2023-08-26 17:45:31,000 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 116.5) internal successors, (466), 4 states have internal predecessors, (466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:31,000 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:31,000 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:31,000 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2023-08-26 17:45:31,000 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:45:31,000 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:31,001 INFO L85 PathProgramCache]: Analyzing trace with hash -219151925, now seen corresponding path program 1 times [2023-08-26 17:45:31,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:31,001 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [696523408] [2023-08-26 17:45:31,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:31,001 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:31,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:31,017 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 17:45:31,017 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:31,018 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [696523408] [2023-08-26 17:45:31,018 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [696523408] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:31,018 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:31,018 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:31,018 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129330751] [2023-08-26 17:45:31,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:31,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:45:31,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:31,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:45:31,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:45:31,019 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 125 out of 345 [2023-08-26 17:45:31,020 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 52 places, 43 transitions, 133 flow. Second operand has 3 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 17:45:31,020 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:31,020 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 125 of 345 [2023-08-26 17:45:31,020 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:32,505 INFO L124 PetriNetUnfolderBase]: 16976/23366 cut-off events. [2023-08-26 17:45:32,505 INFO L125 PetriNetUnfolderBase]: For 6579/6579 co-relation queries the response was YES. [2023-08-26 17:45:32,567 INFO L83 FinitePrefix]: Finished finitePrefix Result has 53939 conditions, 23366 events. 16976/23366 cut-off events. For 6579/6579 co-relation queries the response was YES. Maximal size of possible extension queue 1047. Compared 142420 event pairs, 8000 based on Foata normal form. 532/19954 useless extension candidates. Maximal degree in co-relation 53924. Up to 15523 conditions per place. [2023-08-26 17:45:32,647 INFO L140 encePairwiseOnDemand]: 338/345 looper letters, 65 selfloop transitions, 7 changer transitions 0/75 dead transitions. [2023-08-26 17:45:32,648 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 54 places, 75 transitions, 375 flow [2023-08-26 17:45:32,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:32,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:32,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 444 transitions. [2023-08-26 17:45:32,649 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4289855072463768 [2023-08-26 17:45:32,649 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 444 transitions. [2023-08-26 17:45:32,649 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 444 transitions. [2023-08-26 17:45:32,649 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:32,650 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 444 transitions. [2023-08-26 17:45:32,653 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 148.0) internal successors, (444), 3 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:32,655 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 345.0) internal successors, (1380), 4 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:32,655 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 345.0) internal successors, (1380), 4 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:32,655 INFO L175 Difference]: Start difference. First operand has 52 places, 43 transitions, 133 flow. Second operand 3 states and 444 transitions. [2023-08-26 17:45:32,655 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 54 places, 75 transitions, 375 flow [2023-08-26 17:45:32,664 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 52 places, 75 transitions, 368 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 17:45:32,665 INFO L231 Difference]: Finished difference. Result has 54 places, 48 transitions, 183 flow [2023-08-26 17:45:32,666 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=129, PETRI_DIFFERENCE_MINUEND_PLACES=50, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=43, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=36, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=183, PETRI_PLACES=54, PETRI_TRANSITIONS=48} [2023-08-26 17:45:32,670 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 6 predicate places. [2023-08-26 17:45:32,670 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 48 transitions, 183 flow [2023-08-26 17:45:32,671 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 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 17:45:32,671 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:32,671 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:32,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2023-08-26 17:45:32,671 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:45:32,671 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:32,671 INFO L85 PathProgramCache]: Analyzing trace with hash 1796227814, now seen corresponding path program 1 times [2023-08-26 17:45:32,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:32,672 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236681634] [2023-08-26 17:45:32,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:32,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:32,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:32,854 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 17:45:32,854 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:32,854 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236681634] [2023-08-26 17:45:32,854 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236681634] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:45:32,854 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1519377077] [2023-08-26 17:45:32,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:32,854 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:45:32,855 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:45:32,855 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 17:45:32,857 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 17:45:32,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:32,925 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 21 conjunts are in the unsatisfiable core [2023-08-26 17:45:32,926 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:45:32,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 17:45:32,934 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2023-08-26 17:45:33,058 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 17:45:33,058 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:45:33,158 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 17:45:33,159 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1519377077] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:45:33,161 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:45:33,161 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2023-08-26 17:45:33,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494103452] [2023-08-26 17:45:33,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:45:33,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-08-26 17:45:33,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:33,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-08-26 17:45:33,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-08-26 17:45:33,164 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 114 out of 345 [2023-08-26 17:45:33,165 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 48 transitions, 183 flow. Second operand has 14 states, 14 states have (on average 115.92857142857143) internal successors, (1623), 14 states have internal predecessors, (1623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:33,165 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:33,165 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 114 of 345 [2023-08-26 17:45:33,165 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:34,738 INFO L124 PetriNetUnfolderBase]: 16195/23962 cut-off events. [2023-08-26 17:45:34,738 INFO L125 PetriNetUnfolderBase]: For 12695/13035 co-relation queries the response was YES. [2023-08-26 17:45:34,799 INFO L83 FinitePrefix]: Finished finitePrefix Result has 59244 conditions, 23962 events. 16195/23962 cut-off events. For 12695/13035 co-relation queries the response was YES. Maximal size of possible extension queue 963. Compared 164485 event pairs, 3761 based on Foata normal form. 0/20951 useless extension candidates. Maximal degree in co-relation 59228. Up to 7070 conditions per place. [2023-08-26 17:45:34,878 INFO L140 encePairwiseOnDemand]: 340/345 looper letters, 96 selfloop transitions, 10 changer transitions 0/120 dead transitions. [2023-08-26 17:45:34,879 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 59 places, 120 transitions, 632 flow [2023-08-26 17:45:34,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 17:45:34,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 17:45:34,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 782 transitions. [2023-08-26 17:45:34,880 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.37777777777777777 [2023-08-26 17:45:34,880 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 782 transitions. [2023-08-26 17:45:34,880 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 782 transitions. [2023-08-26 17:45:34,880 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:34,880 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 782 transitions. [2023-08-26 17:45:34,881 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 130.33333333333334) internal successors, (782), 6 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 17:45:34,883 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 345.0) internal successors, (2415), 7 states have internal predecessors, (2415), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:34,884 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 345.0) internal successors, (2415), 7 states have internal predecessors, (2415), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:34,884 INFO L175 Difference]: Start difference. First operand has 54 places, 48 transitions, 183 flow. Second operand 6 states and 782 transitions. [2023-08-26 17:45:34,884 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 59 places, 120 transitions, 632 flow [2023-08-26 17:45:34,920 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 57 places, 120 transitions, 614 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 17:45:34,921 INFO L231 Difference]: Finished difference. Result has 59 places, 52 transitions, 227 flow [2023-08-26 17:45:34,921 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=169, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=48, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=40, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=227, PETRI_PLACES=59, PETRI_TRANSITIONS=52} [2023-08-26 17:45:34,922 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 11 predicate places. [2023-08-26 17:45:34,922 INFO L495 AbstractCegarLoop]: Abstraction has has 59 places, 52 transitions, 227 flow [2023-08-26 17:45:34,922 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 115.92857142857143) internal successors, (1623), 14 states have internal predecessors, (1623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:34,922 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:34,923 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:34,927 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-08-26 17:45:35,124 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:45:35,124 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:45:35,125 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:35,125 INFO L85 PathProgramCache]: Analyzing trace with hash 252284291, now seen corresponding path program 1 times [2023-08-26 17:45:35,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:35,125 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440787572] [2023-08-26 17:45:35,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:35,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:35,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:35,211 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-26 17:45:35,211 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:35,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440787572] [2023-08-26 17:45:35,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1440787572] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:35,211 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:35,212 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:35,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569743559] [2023-08-26 17:45:35,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:35,212 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 17:45:35,212 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:35,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 17:45:35,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 17:45:35,213 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 115 out of 345 [2023-08-26 17:45:35,213 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 52 transitions, 227 flow. Second operand has 4 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 17:45:35,213 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:35,213 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 115 of 345 [2023-08-26 17:45:35,213 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:36,880 INFO L124 PetriNetUnfolderBase]: 17855/26325 cut-off events. [2023-08-26 17:45:36,880 INFO L125 PetriNetUnfolderBase]: For 26472/26533 co-relation queries the response was YES. [2023-08-26 17:45:36,976 INFO L83 FinitePrefix]: Finished finitePrefix Result has 66465 conditions, 26325 events. 17855/26325 cut-off events. For 26472/26533 co-relation queries the response was YES. Maximal size of possible extension queue 1053. Compared 181763 event pairs, 5768 based on Foata normal form. 2/22809 useless extension candidates. Maximal degree in co-relation 66446. Up to 13665 conditions per place. [2023-08-26 17:45:37,082 INFO L140 encePairwiseOnDemand]: 340/345 looper letters, 62 selfloop transitions, 4 changer transitions 0/80 dead transitions. [2023-08-26 17:45:37,083 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 62 places, 80 transitions, 503 flow [2023-08-26 17:45:37,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 17:45:37,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 17:45:37,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 509 transitions. [2023-08-26 17:45:37,084 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.36884057971014494 [2023-08-26 17:45:37,084 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 509 transitions. [2023-08-26 17:45:37,084 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 509 transitions. [2023-08-26 17:45:37,084 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:37,084 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 509 transitions. [2023-08-26 17:45:37,085 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 127.25) internal successors, (509), 4 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 17:45:37,086 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 345.0) internal successors, (1725), 5 states have internal predecessors, (1725), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:37,086 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 345.0) internal successors, (1725), 5 states have internal predecessors, (1725), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:37,086 INFO L175 Difference]: Start difference. First operand has 59 places, 52 transitions, 227 flow. Second operand 4 states and 509 transitions. [2023-08-26 17:45:37,086 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 62 places, 80 transitions, 503 flow [2023-08-26 17:45:37,096 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 60 places, 80 transitions, 488 flow, removed 4 selfloop flow, removed 2 redundant places. [2023-08-26 17:45:37,097 INFO L231 Difference]: Finished difference. Result has 62 places, 53 transitions, 240 flow [2023-08-26 17:45:37,097 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=219, PETRI_DIFFERENCE_MINUEND_PLACES=57, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=52, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=48, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=240, PETRI_PLACES=62, PETRI_TRANSITIONS=53} [2023-08-26 17:45:37,097 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 14 predicate places. [2023-08-26 17:45:37,098 INFO L495 AbstractCegarLoop]: Abstraction has has 62 places, 53 transitions, 240 flow [2023-08-26 17:45:37,098 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 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 17:45:37,098 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:37,098 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:37,098 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2023-08-26 17:45:37,098 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:45:37,098 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:37,099 INFO L85 PathProgramCache]: Analyzing trace with hash 1686998069, now seen corresponding path program 1 times [2023-08-26 17:45:37,099 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:37,099 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949530394] [2023-08-26 17:45:37,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:37,099 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:37,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:37,117 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:37,118 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:37,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949530394] [2023-08-26 17:45:37,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949530394] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:37,118 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:37,118 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:37,118 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308630204] [2023-08-26 17:45:37,118 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:37,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:45:37,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:37,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:45:37,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:45:37,120 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 125 out of 345 [2023-08-26 17:45:37,120 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 62 places, 53 transitions, 240 flow. Second operand has 3 states, 3 states have (on average 128.33333333333334) internal successors, (385), 3 states have internal predecessors, (385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:37,120 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:37,120 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 125 of 345 [2023-08-26 17:45:37,120 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:40,783 INFO L124 PetriNetUnfolderBase]: 41881/57635 cut-off events. [2023-08-26 17:45:40,783 INFO L125 PetriNetUnfolderBase]: For 49962/49962 co-relation queries the response was YES. [2023-08-26 17:45:40,970 INFO L83 FinitePrefix]: Finished finitePrefix Result has 157770 conditions, 57635 events. 41881/57635 cut-off events. For 49962/49962 co-relation queries the response was YES. Maximal size of possible extension queue 2042. Compared 381368 event pairs, 18607 based on Foata normal form. 936/56243 useless extension candidates. Maximal degree in co-relation 157748. Up to 36256 conditions per place. [2023-08-26 17:45:41,173 INFO L140 encePairwiseOnDemand]: 338/345 looper letters, 82 selfloop transitions, 8 changer transitions 0/93 dead transitions. [2023-08-26 17:45:41,173 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 64 places, 93 transitions, 605 flow [2023-08-26 17:45:41,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:45:41,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:45:41,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 444 transitions. [2023-08-26 17:45:41,174 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4289855072463768 [2023-08-26 17:45:41,174 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 444 transitions. [2023-08-26 17:45:41,174 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 444 transitions. [2023-08-26 17:45:41,174 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:41,174 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 444 transitions. [2023-08-26 17:45:41,175 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 148.0) internal successors, (444), 3 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:41,176 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 345.0) internal successors, (1380), 4 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:41,176 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 345.0) internal successors, (1380), 4 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:41,177 INFO L175 Difference]: Start difference. First operand has 62 places, 53 transitions, 240 flow. Second operand 3 states and 444 transitions. [2023-08-26 17:45:41,177 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 64 places, 93 transitions, 605 flow [2023-08-26 17:45:41,373 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 62 places, 93 transitions, 598 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 17:45:41,373 INFO L231 Difference]: Finished difference. Result has 64 places, 58 transitions, 299 flow [2023-08-26 17:45:41,374 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=236, PETRI_DIFFERENCE_MINUEND_PLACES=60, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=53, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=45, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=299, PETRI_PLACES=64, PETRI_TRANSITIONS=58} [2023-08-26 17:45:41,374 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 16 predicate places. [2023-08-26 17:45:41,374 INFO L495 AbstractCegarLoop]: Abstraction has has 64 places, 58 transitions, 299 flow [2023-08-26 17:45:41,374 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 128.33333333333334) internal successors, (385), 3 states have internal predecessors, (385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:41,374 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:41,374 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:41,374 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2023-08-26 17:45:41,375 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:45:41,375 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:41,375 INFO L85 PathProgramCache]: Analyzing trace with hash 757335709, now seen corresponding path program 1 times [2023-08-26 17:45:41,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:41,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503179979] [2023-08-26 17:45:41,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:41,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:41,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:41,821 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:41,821 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:41,821 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503179979] [2023-08-26 17:45:41,822 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503179979] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:45:41,822 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776961938] [2023-08-26 17:45:41,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:41,822 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:45:41,822 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:45:41,823 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 17:45:41,848 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 17:45:41,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:41,910 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 21 conjunts are in the unsatisfiable core [2023-08-26 17:45:41,911 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:45:41,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 17:45:41,918 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2023-08-26 17:45:42,053 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:42,054 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:45:42,160 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:45:42,160 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776961938] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:45:42,161 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:45:42,161 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2023-08-26 17:45:42,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040997251] [2023-08-26 17:45:42,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:45:42,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-08-26 17:45:42,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:42,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-08-26 17:45:42,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-08-26 17:45:42,164 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 115 out of 345 [2023-08-26 17:45:42,165 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 58 transitions, 299 flow. Second operand has 14 states, 14 states have (on average 117.14285714285714) internal successors, (1640), 14 states have internal predecessors, (1640), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:42,165 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:42,165 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 115 of 345 [2023-08-26 17:45:42,166 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:49,051 INFO L124 PetriNetUnfolderBase]: 58931/86522 cut-off events. [2023-08-26 17:45:49,051 INFO L125 PetriNetUnfolderBase]: For 98806/99982 co-relation queries the response was YES. [2023-08-26 17:45:49,350 INFO L83 FinitePrefix]: Finished finitePrefix Result has 250061 conditions, 86522 events. 58931/86522 cut-off events. For 98806/99982 co-relation queries the response was YES. Maximal size of possible extension queue 2906. Compared 677225 event pairs, 12283 based on Foata normal form. 1434/86214 useless extension candidates. Maximal degree in co-relation 250038. Up to 25963 conditions per place. [2023-08-26 17:45:49,664 INFO L140 encePairwiseOnDemand]: 340/345 looper letters, 153 selfloop transitions, 10 changer transitions 0/180 dead transitions. [2023-08-26 17:45:49,664 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 70 places, 180 transitions, 1252 flow [2023-08-26 17:45:49,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 17:45:49,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 17:45:49,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 919 transitions. [2023-08-26 17:45:49,665 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.38053830227743274 [2023-08-26 17:45:49,665 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 919 transitions. [2023-08-26 17:45:49,665 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 919 transitions. [2023-08-26 17:45:49,665 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:49,666 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 919 transitions. [2023-08-26 17:45:49,667 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 131.28571428571428) internal successors, (919), 7 states have internal predecessors, (919), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:49,669 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 345.0) internal successors, (2760), 8 states have internal predecessors, (2760), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:49,669 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 345.0) internal successors, (2760), 8 states have internal predecessors, (2760), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:49,669 INFO L175 Difference]: Start difference. First operand has 64 places, 58 transitions, 299 flow. Second operand 7 states and 919 transitions. [2023-08-26 17:45:49,669 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 70 places, 180 transitions, 1252 flow [2023-08-26 17:45:50,060 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 68 places, 180 transitions, 1230 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 17:45:50,062 INFO L231 Difference]: Finished difference. Result has 69 places, 63 transitions, 346 flow [2023-08-26 17:45:50,063 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=283, PETRI_DIFFERENCE_MINUEND_PLACES=62, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=52, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=346, PETRI_PLACES=69, PETRI_TRANSITIONS=63} [2023-08-26 17:45:50,063 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 21 predicate places. [2023-08-26 17:45:50,063 INFO L495 AbstractCegarLoop]: Abstraction has has 69 places, 63 transitions, 346 flow [2023-08-26 17:45:50,063 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 117.14285714285714) internal successors, (1640), 14 states have internal predecessors, (1640), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:50,064 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:50,064 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 17:45:50,069 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-08-26 17:45:50,268 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:45:50,269 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:45:50,269 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:50,269 INFO L85 PathProgramCache]: Analyzing trace with hash -621504366, now seen corresponding path program 2 times [2023-08-26 17:45:50,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:50,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647245796] [2023-08-26 17:45:50,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:50,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:50,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:50,305 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:45:50,306 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:50,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647245796] [2023-08-26 17:45:50,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1647245796] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:45:50,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287939167] [2023-08-26 17:45:50,306 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 17:45:50,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:45:50,306 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:45:50,307 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 17:45:50,308 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-08-26 17:45:50,370 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 17:45:50,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 17:45:50,371 INFO L262 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 17:45:50,372 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:45:50,387 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:45:50,387 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-08-26 17:45:50,387 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1287939167] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:50,388 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-08-26 17:45:50,388 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 5 [2023-08-26 17:45:50,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067358143] [2023-08-26 17:45:50,388 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:50,388 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:45:50,388 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:50,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:45:50,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-08-26 17:45:50,389 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 134 out of 345 [2023-08-26 17:45:50,390 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 63 transitions, 346 flow. Second operand has 5 states, 5 states have (on average 136.6) internal successors, (683), 5 states have internal predecessors, (683), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:50,390 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:50,390 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 134 of 345 [2023-08-26 17:45:50,390 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:45:55,339 INFO L124 PetriNetUnfolderBase]: 41656/61818 cut-off events. [2023-08-26 17:45:55,340 INFO L125 PetriNetUnfolderBase]: For 84402/85350 co-relation queries the response was YES. [2023-08-26 17:45:55,555 INFO L83 FinitePrefix]: Finished finitePrefix Result has 179552 conditions, 61818 events. 41656/61818 cut-off events. For 84402/85350 co-relation queries the response was YES. Maximal size of possible extension queue 2358. Compared 488597 event pairs, 4794 based on Foata normal form. 3150/63797 useless extension candidates. Maximal degree in co-relation 179527. Up to 20568 conditions per place. [2023-08-26 17:45:55,778 INFO L140 encePairwiseOnDemand]: 340/345 looper letters, 124 selfloop transitions, 6 changer transitions 0/147 dead transitions. [2023-08-26 17:45:55,778 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 71 places, 147 transitions, 1055 flow [2023-08-26 17:45:55,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 17:45:55,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 17:45:55,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 763 transitions. [2023-08-26 17:45:55,779 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44231884057971016 [2023-08-26 17:45:55,779 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 763 transitions. [2023-08-26 17:45:55,779 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 763 transitions. [2023-08-26 17:45:55,779 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:45:55,779 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 763 transitions. [2023-08-26 17:45:55,780 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 152.6) internal successors, (763), 5 states have internal predecessors, (763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:55,781 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 345.0) internal successors, (2070), 6 states have internal predecessors, (2070), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:55,781 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 345.0) internal successors, (2070), 6 states have internal predecessors, (2070), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:55,781 INFO L175 Difference]: Start difference. First operand has 69 places, 63 transitions, 346 flow. Second operand 5 states and 763 transitions. [2023-08-26 17:45:55,781 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 71 places, 147 transitions, 1055 flow [2023-08-26 17:45:55,992 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 68 places, 147 transitions, 1038 flow, removed 4 selfloop flow, removed 3 redundant places. [2023-08-26 17:45:55,993 INFO L231 Difference]: Finished difference. Result has 69 places, 59 transitions, 324 flow [2023-08-26 17:45:55,993 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=301, PETRI_DIFFERENCE_MINUEND_PLACES=64, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=52, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=324, PETRI_PLACES=69, PETRI_TRANSITIONS=59} [2023-08-26 17:45:55,993 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 21 predicate places. [2023-08-26 17:45:55,994 INFO L495 AbstractCegarLoop]: Abstraction has has 69 places, 59 transitions, 324 flow [2023-08-26 17:45:55,994 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 136.6) internal successors, (683), 5 states have internal predecessors, (683), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:55,994 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:45:55,994 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:45:55,998 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-08-26 17:45:56,194 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:45:56,197 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:45:56,197 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:45:56,197 INFO L85 PathProgramCache]: Analyzing trace with hash 784297755, now seen corresponding path program 1 times [2023-08-26 17:45:56,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:45:56,197 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149627792] [2023-08-26 17:45:56,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:45:56,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:45:56,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:45:56,224 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-26 17:45:56,224 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:45:56,224 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149627792] [2023-08-26 17:45:56,224 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1149627792] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:45:56,224 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:45:56,224 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:45:56,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321855695] [2023-08-26 17:45:56,224 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:45:56,225 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:45:56,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:45:56,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:45:56,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:45:56,226 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 125 out of 345 [2023-08-26 17:45:56,226 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 59 transitions, 324 flow. Second operand has 3 states, 3 states have (on average 128.66666666666666) internal successors, (386), 3 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:45:56,226 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:45:56,226 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 125 of 345 [2023-08-26 17:45:56,226 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:46:05,111 INFO L124 PetriNetUnfolderBase]: 83023/114849 cut-off events. [2023-08-26 17:46:05,112 INFO L125 PetriNetUnfolderBase]: For 177832/177832 co-relation queries the response was YES. [2023-08-26 17:46:05,537 INFO L83 FinitePrefix]: Finished finitePrefix Result has 352548 conditions, 114849 events. 83023/114849 cut-off events. For 177832/177832 co-relation queries the response was YES. Maximal size of possible extension queue 3950. Compared 827384 event pairs, 38079 based on Foata normal form. 2028/114739 useless extension candidates. Maximal degree in co-relation 352524. Up to 69582 conditions per place. [2023-08-26 17:46:06,039 INFO L140 encePairwiseOnDemand]: 338/345 looper letters, 88 selfloop transitions, 11 changer transitions 0/102 dead transitions. [2023-08-26 17:46:06,040 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 71 places, 102 transitions, 768 flow [2023-08-26 17:46:06,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:46:06,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:46:06,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 441 transitions. [2023-08-26 17:46:06,041 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4260869565217391 [2023-08-26 17:46:06,041 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 441 transitions. [2023-08-26 17:46:06,041 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 441 transitions. [2023-08-26 17:46:06,041 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:46:06,041 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 441 transitions. [2023-08-26 17:46:06,042 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 147.0) internal successors, (441), 3 states have internal predecessors, (441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:06,042 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 345.0) internal successors, (1380), 4 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:06,043 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 345.0) internal successors, (1380), 4 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:06,043 INFO L175 Difference]: Start difference. First operand has 69 places, 59 transitions, 324 flow. Second operand 3 states and 441 transitions. [2023-08-26 17:46:06,043 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 71 places, 102 transitions, 768 flow [2023-08-26 17:46:06,478 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 67 places, 102 transitions, 722 flow, removed 6 selfloop flow, removed 4 redundant places. [2023-08-26 17:46:06,479 INFO L231 Difference]: Finished difference. Result has 69 places, 65 transitions, 390 flow [2023-08-26 17:46:06,479 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=301, PETRI_DIFFERENCE_MINUEND_PLACES=65, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=48, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=390, PETRI_PLACES=69, PETRI_TRANSITIONS=65} [2023-08-26 17:46:06,480 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 21 predicate places. [2023-08-26 17:46:06,480 INFO L495 AbstractCegarLoop]: Abstraction has has 69 places, 65 transitions, 390 flow [2023-08-26 17:46:06,480 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 128.66666666666666) internal successors, (386), 3 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:06,480 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:46:06,480 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:46:06,480 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2023-08-26 17:46:06,480 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:46:06,481 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:46:06,481 INFO L85 PathProgramCache]: Analyzing trace with hash -1456570707, now seen corresponding path program 1 times [2023-08-26 17:46:06,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:46:06,481 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463238335] [2023-08-26 17:46:06,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:46:06,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:46:06,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:46:06,797 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-26 17:46:06,797 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:46:06,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463238335] [2023-08-26 17:46:06,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1463238335] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:46:06,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1269279693] [2023-08-26 17:46:06,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:46:06,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:46:06,798 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:46:06,799 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 17:46:06,801 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-08-26 17:46:06,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:46:06,890 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 21 conjunts are in the unsatisfiable core [2023-08-26 17:46:06,891 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:46:06,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 17:46:06,899 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2023-08-26 17:46:07,059 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-26 17:46:07,059 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:46:07,170 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-26 17:46:07,171 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1269279693] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:46:07,171 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:46:07,171 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2023-08-26 17:46:07,171 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002600583] [2023-08-26 17:46:07,171 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:46:07,172 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-08-26 17:46:07,172 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:46:07,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-08-26 17:46:07,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-08-26 17:46:07,174 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 115 out of 345 [2023-08-26 17:46:07,175 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 65 transitions, 390 flow. Second operand has 14 states, 14 states have (on average 117.35714285714286) internal successors, (1643), 14 states have internal predecessors, (1643), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:07,176 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:46:07,176 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 115 of 345 [2023-08-26 17:46:07,176 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:46:21,596 INFO L124 PetriNetUnfolderBase]: 115281/170690 cut-off events. [2023-08-26 17:46:21,597 INFO L125 PetriNetUnfolderBase]: For 263727/265708 co-relation queries the response was YES. [2023-08-26 17:46:22,402 INFO L83 FinitePrefix]: Finished finitePrefix Result has 533932 conditions, 170690 events. 115281/170690 cut-off events. For 263727/265708 co-relation queries the response was YES. Maximal size of possible extension queue 5763. Compared 1449854 event pairs, 24365 based on Foata normal form. 2954/171513 useless extension candidates. Maximal degree in co-relation 533908. Up to 50446 conditions per place. [2023-08-26 17:46:23,152 INFO L140 encePairwiseOnDemand]: 340/345 looper letters, 164 selfloop transitions, 10 changer transitions 0/195 dead transitions. [2023-08-26 17:46:23,152 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 75 places, 195 transitions, 1473 flow [2023-08-26 17:46:23,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 17:46:23,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 17:46:23,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 910 transitions. [2023-08-26 17:46:23,154 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.37681159420289856 [2023-08-26 17:46:23,154 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 910 transitions. [2023-08-26 17:46:23,154 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 910 transitions. [2023-08-26 17:46:23,154 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:46:23,154 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 910 transitions. [2023-08-26 17:46:23,155 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 130.0) internal successors, (910), 7 states have internal predecessors, (910), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:23,157 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 345.0) internal successors, (2760), 8 states have internal predecessors, (2760), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:23,157 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 345.0) internal successors, (2760), 8 states have internal predecessors, (2760), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:23,157 INFO L175 Difference]: Start difference. First operand has 69 places, 65 transitions, 390 flow. Second operand 7 states and 910 transitions. [2023-08-26 17:46:23,158 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 75 places, 195 transitions, 1473 flow [2023-08-26 17:46:24,728 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 195 transitions, 1445 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 17:46:24,730 INFO L231 Difference]: Finished difference. Result has 74 places, 70 transitions, 431 flow [2023-08-26 17:46:24,730 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=368, PETRI_DIFFERENCE_MINUEND_PLACES=67, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=65, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=59, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=431, PETRI_PLACES=74, PETRI_TRANSITIONS=70} [2023-08-26 17:46:24,730 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 26 predicate places. [2023-08-26 17:46:24,730 INFO L495 AbstractCegarLoop]: Abstraction has has 74 places, 70 transitions, 431 flow [2023-08-26 17:46:24,731 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 117.35714285714286) internal successors, (1643), 14 states have internal predecessors, (1643), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:24,731 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:46:24,731 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:46:24,740 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-08-26 17:46:24,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2023-08-26 17:46:24,937 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:46:24,937 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:46:24,937 INFO L85 PathProgramCache]: Analyzing trace with hash 2140662029, now seen corresponding path program 1 times [2023-08-26 17:46:24,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:46:24,937 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208346919] [2023-08-26 17:46:24,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:46:24,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:46:24,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:46:24,976 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-08-26 17:46:24,977 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:46:24,977 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208346919] [2023-08-26 17:46:24,977 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208346919] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:46:24,977 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:46:24,977 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 17:46:24,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274946153] [2023-08-26 17:46:24,978 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:46:24,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:46:24,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:46:24,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:46:24,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:46:24,979 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 122 out of 345 [2023-08-26 17:46:24,979 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 74 places, 70 transitions, 431 flow. Second operand has 5 states, 5 states have (on average 125.0) internal successors, (625), 5 states have internal predecessors, (625), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:24,979 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:46:24,979 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 122 of 345 [2023-08-26 17:46:24,979 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:46:56,619 INFO L124 PetriNetUnfolderBase]: 269205/374881 cut-off events. [2023-08-26 17:46:56,619 INFO L125 PetriNetUnfolderBase]: For 638297/638297 co-relation queries the response was YES. [2023-08-26 17:46:58,130 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1231868 conditions, 374881 events. 269205/374881 cut-off events. For 638297/638297 co-relation queries the response was YES. Maximal size of possible extension queue 11828. Compared 3113003 event pairs, 89292 based on Foata normal form. 4000/378819 useless extension candidates. Maximal degree in co-relation 1231842. Up to 154102 conditions per place. [2023-08-26 17:46:59,730 INFO L140 encePairwiseOnDemand]: 334/345 looper letters, 219 selfloop transitions, 45 changer transitions 0/267 dead transitions. [2023-08-26 17:46:59,730 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 267 transitions, 2149 flow [2023-08-26 17:46:59,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 17:46:59,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 17:46:59,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1019 transitions. [2023-08-26 17:46:59,731 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42194616977225674 [2023-08-26 17:46:59,731 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1019 transitions. [2023-08-26 17:46:59,731 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1019 transitions. [2023-08-26 17:46:59,731 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:46:59,732 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1019 transitions. [2023-08-26 17:46:59,733 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 145.57142857142858) internal successors, (1019), 7 states have internal predecessors, (1019), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:59,735 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 345.0) internal successors, (2760), 8 states have internal predecessors, (2760), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:59,735 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 345.0) internal successors, (2760), 8 states have internal predecessors, (2760), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:46:59,735 INFO L175 Difference]: Start difference. First operand has 74 places, 70 transitions, 431 flow. Second operand 7 states and 1019 transitions. [2023-08-26 17:46:59,735 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 80 places, 267 transitions, 2149 flow [2023-08-26 17:47:13,609 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 267 transitions, 2136 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-08-26 17:47:13,612 INFO L231 Difference]: Finished difference. Result has 85 places, 107 transitions, 918 flow [2023-08-26 17:47:13,612 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=428, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=13, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=46, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=918, PETRI_PLACES=85, PETRI_TRANSITIONS=107} [2023-08-26 17:47:13,612 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 37 predicate places. [2023-08-26 17:47:13,613 INFO L495 AbstractCegarLoop]: Abstraction has has 85 places, 107 transitions, 918 flow [2023-08-26 17:47:13,613 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 125.0) internal successors, (625), 5 states have internal predecessors, (625), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:47:13,613 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:47:13,613 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:47:13,613 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2023-08-26 17:47:13,613 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:47:13,613 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:47:13,613 INFO L85 PathProgramCache]: Analyzing trace with hash -615751599, now seen corresponding path program 2 times [2023-08-26 17:47:13,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:47:13,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678068871] [2023-08-26 17:47:13,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:47:13,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:47:13,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:47:13,669 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:47:13,669 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:47:13,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678068871] [2023-08-26 17:47:13,669 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678068871] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:47:13,669 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:47:13,669 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 17:47:13,669 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995007917] [2023-08-26 17:47:13,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:47:13,670 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:47:13,670 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:47:13,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:47:13,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:47:13,671 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 122 out of 345 [2023-08-26 17:47:13,671 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 85 places, 107 transitions, 918 flow. Second operand has 5 states, 5 states have (on average 125.0) internal successors, (625), 5 states have internal predecessors, (625), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:47:13,671 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:47:13,671 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 122 of 345 [2023-08-26 17:47:13,671 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:48:12,989 INFO L124 PetriNetUnfolderBase]: 408577/574905 cut-off events. [2023-08-26 17:48:12,989 INFO L125 PetriNetUnfolderBase]: For 1672444/1672444 co-relation queries the response was YES. [2023-08-26 17:48:16,374 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2134706 conditions, 574905 events. 408577/574905 cut-off events. For 1672444/1672444 co-relation queries the response was YES. Maximal size of possible extension queue 19008. Compared 5061201 event pairs, 202141 based on Foata normal form. 4204/579013 useless extension candidates. Maximal degree in co-relation 2134675. Up to 357870 conditions per place. [2023-08-26 17:48:18,946 INFO L140 encePairwiseOnDemand]: 334/345 looper letters, 276 selfloop transitions, 98 changer transitions 0/377 dead transitions. [2023-08-26 17:48:18,946 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 92 places, 377 transitions, 3723 flow [2023-08-26 17:48:18,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-08-26 17:48:18,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2023-08-26 17:48:18,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 1155 transitions. [2023-08-26 17:48:18,947 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.41847826086956524 [2023-08-26 17:48:18,948 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 1155 transitions. [2023-08-26 17:48:18,948 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 1155 transitions. [2023-08-26 17:48:18,948 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:48:18,948 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 1155 transitions. [2023-08-26 17:48:18,949 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 144.375) internal successors, (1155), 8 states have internal predecessors, (1155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:48:18,951 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 345.0) internal successors, (3105), 9 states have internal predecessors, (3105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:48:18,951 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 345.0) internal successors, (3105), 9 states have internal predecessors, (3105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:48:18,951 INFO L175 Difference]: Start difference. First operand has 85 places, 107 transitions, 918 flow. Second operand 8 states and 1155 transitions. [2023-08-26 17:48:18,951 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 92 places, 377 transitions, 3723 flow [2023-08-26 17:49:11,683 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 91 places, 377 transitions, 3664 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:49:11,686 INFO L231 Difference]: Finished difference. Result has 97 places, 200 transitions, 2354 flow [2023-08-26 17:49:11,686 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=345, PETRI_DIFFERENCE_MINUEND_FLOW=909, PETRI_DIFFERENCE_MINUEND_PLACES=84, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=107, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=23, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=53, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=2354, PETRI_PLACES=97, PETRI_TRANSITIONS=200} [2023-08-26 17:49:11,687 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, 49 predicate places. [2023-08-26 17:49:11,687 INFO L495 AbstractCegarLoop]: Abstraction has has 97 places, 200 transitions, 2354 flow [2023-08-26 17:49:11,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 125.0) internal successors, (625), 5 states have internal predecessors, (625), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:49:11,687 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:49:11,688 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:49:11,688 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2023-08-26 17:49:11,688 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting thr1Err2ASSERT_VIOLATIONASSERT === [thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err2ASSERT_VIOLATIONASSERT, thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 11 more)] === [2023-08-26 17:49:11,688 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:49:11,688 INFO L85 PathProgramCache]: Analyzing trace with hash -1258817911, now seen corresponding path program 1 times [2023-08-26 17:49:11,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:49:11,688 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565431356] [2023-08-26 17:49:11,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:49:11,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:49:11,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:49:11,724 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:49:11,725 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:49:11,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565431356] [2023-08-26 17:49:11,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1565431356] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:49:11,725 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:49:11,725 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 17:49:11,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100728221] [2023-08-26 17:49:11,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:49:11,726 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:49:11,726 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:49:11,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:49:11,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:49:11,727 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 122 out of 345 [2023-08-26 17:49:11,727 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 97 places, 200 transitions, 2354 flow. Second operand has 5 states, 5 states have (on average 125.0) internal successors, (625), 5 states have internal predecessors, (625), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:49:11,727 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:49:11,727 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 122 of 345 [2023-08-26 17:49:11,727 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:50:49,306 INFO L124 PetriNetUnfolderBase]: 529523/748625 cut-off events. [2023-08-26 17:50:49,306 INFO L125 PetriNetUnfolderBase]: For 3272202/3272202 co-relation queries the response was YES. [2023-08-26 17:50:55,610 INFO L83 FinitePrefix]: Finished finitePrefix Result has 3011406 conditions, 748625 events. 529523/748625 cut-off events. For 3272202/3272202 co-relation queries the response was YES. Maximal size of possible extension queue 25506. Compared 6871203 event pairs, 305976 based on Foata normal form. 3804/752334 useless extension candidates. Maximal degree in co-relation 3011369. Up to 567373 conditions per place. [2023-08-26 17:51:00,942 INFO L140 encePairwiseOnDemand]: 334/345 looper letters, 381 selfloop transitions, 78 changer transitions 0/462 dead transitions. [2023-08-26 17:51:00,942 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 104 places, 462 transitions, 5413 flow [2023-08-26 17:51:00,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-08-26 17:51:00,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2023-08-26 17:51:00,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 1159 transitions. [2023-08-26 17:51:00,944 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.41992753623188406 [2023-08-26 17:51:00,944 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 1159 transitions. [2023-08-26 17:51:00,945 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 1159 transitions. [2023-08-26 17:51:00,945 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:51:00,945 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 1159 transitions. [2023-08-26 17:51:00,946 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 144.875) internal successors, (1159), 8 states have internal predecessors, (1159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:51:00,950 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 345.0) internal successors, (3105), 9 states have internal predecessors, (3105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:51:00,950 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 345.0) internal successors, (3105), 9 states have internal predecessors, (3105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:51:00,950 INFO L175 Difference]: Start difference. First operand has 97 places, 200 transitions, 2354 flow. Second operand 8 states and 1159 transitions. [2023-08-26 17:51:00,950 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 104 places, 462 transitions, 5413 flow