/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/31_simple_loop5_vs.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 17:55:34,660 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 17:55:34,744 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 17:55:34,748 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 17:55:34,749 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 17:55:34,778 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 17:55:34,779 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 17:55:34,779 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 17:55:34,780 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 17:55:34,783 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 17:55:34,783 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 17:55:34,784 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 17:55:34,784 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 17:55:34,785 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 17:55:34,785 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 17:55:34,785 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 17:55:34,786 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 17:55:34,786 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 17:55:34,786 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 17:55:34,786 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 17:55:34,786 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 17:55:34,787 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 17:55:34,787 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 17:55:34,788 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 17:55:34,788 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 17:55:34,788 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 17:55:34,789 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 17:55:34,789 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 17:55:34,789 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 17:55:34,789 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 17:55:34,790 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 17:55:34,790 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 17:55:34,790 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 17:55:34,791 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 17:55:34,791 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 17:55:34,791 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 17:55:35,069 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 17:55:35,099 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 17:55:35,101 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 17:55:35,101 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 17:55:35,102 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 17:55:35,102 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread-ext/31_simple_loop5_vs.i [2023-08-26 17:55:36,252 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 17:55:36,497 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 17:55:36,497 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread-ext/31_simple_loop5_vs.i [2023-08-26 17:55:36,512 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f8e8b53e2/741747428c3144ab9cb46811f6b77d4d/FLAGb43651447 [2023-08-26 17:55:36,523 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f8e8b53e2/741747428c3144ab9cb46811f6b77d4d [2023-08-26 17:55:36,525 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 17:55:36,526 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 17:55:36,527 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 17:55:36,527 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 17:55:36,530 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 17:55:36,530 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:36,531 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b447e79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36, skipping insertion in model container [2023-08-26 17:55:36,531 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:36,561 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 17:55:36,880 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 17:55:36,889 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 17:55:36,921 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [253] [2023-08-26 17:55:36,922 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [253] [2023-08-26 17:55:36,934 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 17:55:36,971 INFO L206 MainTranslator]: Completed translation [2023-08-26 17:55:36,972 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36 WrapperNode [2023-08-26 17:55:36,972 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 17:55:36,973 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 17:55:36,973 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 17:55:36,973 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 17:55:36,979 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:37,005 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:37,030 INFO L138 Inliner]: procedures = 170, calls = 19, calls flagged for inlining = 9, calls inlined = 11, statements flattened = 86 [2023-08-26 17:55:37,030 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 17:55:37,031 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 17:55:37,032 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 17:55:37,032 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 17:55:37,039 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:37,039 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:37,045 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:37,046 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:37,061 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:37,064 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:37,070 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:37,071 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:37,075 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 17:55:37,076 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 17:55:37,076 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 17:55:37,076 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 17:55:37,080 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36" (1/1) ... [2023-08-26 17:55:37,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 17:55:37,095 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:55:37,109 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 17:55:37,135 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 17:55:37,147 INFO L130 BoogieDeclarations]: Found specification of procedure thr2 [2023-08-26 17:55:37,147 INFO L138 BoogieDeclarations]: Found implementation of procedure thr2 [2023-08-26 17:55:37,148 INFO L130 BoogieDeclarations]: Found specification of procedure thr1 [2023-08-26 17:55:37,148 INFO L138 BoogieDeclarations]: Found implementation of procedure thr1 [2023-08-26 17:55:37,148 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 17:55:37,148 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 17:55:37,148 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 17:55:37,148 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 17:55:37,149 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 17:55:37,149 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 17:55:37,149 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 17:55:37,150 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 17:55:37,295 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 17:55:37,297 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 17:55:37,490 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 17:55:37,545 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 17:55:37,546 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-08-26 17:55:37,548 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 05:55:37 BoogieIcfgContainer [2023-08-26 17:55:37,548 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 17:55:37,549 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 17:55:37,549 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 17:55:37,552 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 17:55:37,552 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 05:55:36" (1/3) ... [2023-08-26 17:55:37,557 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d438874 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 05:55:37, skipping insertion in model container [2023-08-26 17:55:37,557 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:55:36" (2/3) ... [2023-08-26 17:55:37,558 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d438874 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 05:55:37, skipping insertion in model container [2023-08-26 17:55:37,558 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 05:55:37" (3/3) ... [2023-08-26 17:55:37,559 INFO L112 eAbstractionObserver]: Analyzing ICFG 31_simple_loop5_vs.i [2023-08-26 17:55:37,578 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 17:55:37,578 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-08-26 17:55:37,578 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 17:55:37,635 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:55:37,659 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 68 places, 69 transitions, 148 flow [2023-08-26 17:55:37,713 INFO L124 PetriNetUnfolderBase]: 8/80 cut-off events. [2023-08-26 17:55:37,714 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:55:37,719 INFO L83 FinitePrefix]: Finished finitePrefix Result has 88 conditions, 80 events. 8/80 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 152 event pairs, 0 based on Foata normal form. 0/63 useless extension candidates. Maximal degree in co-relation 62. Up to 4 conditions per place. [2023-08-26 17:55:37,719 INFO L82 GeneralOperation]: Start removeDead. Operand has 68 places, 69 transitions, 148 flow [2023-08-26 17:55:37,723 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 67 places, 68 transitions, 144 flow [2023-08-26 17:55:37,728 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:55:37,744 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 67 places, 68 transitions, 144 flow [2023-08-26 17:55:37,750 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 67 places, 68 transitions, 144 flow [2023-08-26 17:55:37,751 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 67 places, 68 transitions, 144 flow [2023-08-26 17:55:37,780 INFO L124 PetriNetUnfolderBase]: 8/80 cut-off events. [2023-08-26 17:55:37,781 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:55:37,781 INFO L83 FinitePrefix]: Finished finitePrefix Result has 88 conditions, 80 events. 8/80 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 152 event pairs, 0 based on Foata normal form. 0/63 useless extension candidates. Maximal degree in co-relation 62. Up to 4 conditions per place. [2023-08-26 17:55:37,783 INFO L119 LiptonReduction]: Number of co-enabled transitions 1380 [2023-08-26 17:55:39,262 INFO L134 LiptonReduction]: Checked pairs total: 2278 [2023-08-26 17:55:39,262 INFO L136 LiptonReduction]: Total number of compositions: 62 [2023-08-26 17:55:39,274 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:55:39,280 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;@1d1ae1a2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:55:39,280 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 17:55:39,281 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:55:39,281 INFO L124 PetriNetUnfolderBase]: 0/0 cut-off events. [2023-08-26 17:55:39,282 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:55:39,282 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:39,282 INFO L208 CegarLoopForPetriNet]: trace histogram [1] [2023-08-26 17:55:39,283 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 17:55:39,286 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:39,286 INFO L85 PathProgramCache]: Analyzing trace with hash 371, now seen corresponding path program 1 times [2023-08-26 17:55:39,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:39,293 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557070855] [2023-08-26 17:55:39,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:39,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:39,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:39,385 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 17:55:39,386 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:39,386 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557070855] [2023-08-26 17:55:39,387 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557070855] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:39,387 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:39,387 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [0] imperfect sequences [] total 0 [2023-08-26 17:55:39,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992715057] [2023-08-26 17:55:39,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:39,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-26 17:55:39,401 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:39,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-26 17:55:39,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-26 17:55:39,429 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 54 out of 131 [2023-08-26 17:55:39,430 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 28 transitions, 64 flow. Second operand has 2 states, 2 states have (on average 54.5) internal successors, (109), 2 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:39,430 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:39,430 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 54 of 131 [2023-08-26 17:55:39,431 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:39,549 INFO L124 PetriNetUnfolderBase]: 195/323 cut-off events. [2023-08-26 17:55:39,549 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:55:39,552 INFO L83 FinitePrefix]: Finished finitePrefix Result has 656 conditions, 323 events. 195/323 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 25. Compared 1210 event pairs, 145 based on Foata normal form. 0/270 useless extension candidates. Maximal degree in co-relation 646. Up to 314 conditions per place. [2023-08-26 17:55:39,555 INFO L140 encePairwiseOnDemand]: 124/131 looper letters, 15 selfloop transitions, 0 changer transitions 0/19 dead transitions. [2023-08-26 17:55:39,555 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 24 places, 19 transitions, 76 flow [2023-08-26 17:55:39,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-26 17:55:39,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-26 17:55:39,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 130 transitions. [2023-08-26 17:55:39,569 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4961832061068702 [2023-08-26 17:55:39,570 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 130 transitions. [2023-08-26 17:55:39,570 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 130 transitions. [2023-08-26 17:55:39,572 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:39,574 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 130 transitions. [2023-08-26 17:55:39,579 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 65.0) internal successors, (130), 2 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:39,583 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 131.0) internal successors, (393), 3 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:39,583 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 131.0) internal successors, (393), 3 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:39,585 INFO L175 Difference]: Start difference. First operand has 30 places, 28 transitions, 64 flow. Second operand 2 states and 130 transitions. [2023-08-26 17:55:39,585 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 24 places, 19 transitions, 76 flow [2023-08-26 17:55:39,587 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 23 places, 19 transitions, 75 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:39,588 INFO L231 Difference]: Finished difference. Result has 23 places, 19 transitions, 45 flow [2023-08-26 17:55:39,590 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=131, PETRI_DIFFERENCE_MINUEND_FLOW=45, PETRI_DIFFERENCE_MINUEND_PLACES=22, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=19, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=45, PETRI_PLACES=23, PETRI_TRANSITIONS=19} [2023-08-26 17:55:39,593 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, -7 predicate places. [2023-08-26 17:55:39,593 INFO L495 AbstractCegarLoop]: Abstraction has has 23 places, 19 transitions, 45 flow [2023-08-26 17:55:39,593 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 54.5) internal successors, (109), 2 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:39,593 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:39,593 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:55:39,594 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 17:55:39,594 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 17:55:39,595 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:39,598 INFO L85 PathProgramCache]: Analyzing trace with hash 11359252, now seen corresponding path program 1 times [2023-08-26 17:55:39,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:39,599 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090754741] [2023-08-26 17:55:39,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:39,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:39,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:39,806 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 17:55:39,807 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:39,807 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090754741] [2023-08-26 17:55:39,807 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090754741] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:39,807 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:39,807 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:55:39,807 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320583992] [2023-08-26 17:55:39,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:39,808 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:39,808 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:39,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:39,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:39,811 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 42 out of 131 [2023-08-26 17:55:39,811 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 23 places, 19 transitions, 45 flow. Second operand has 3 states, 3 states have (on average 43.333333333333336) internal successors, (130), 3 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:39,811 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:39,811 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 42 of 131 [2023-08-26 17:55:39,811 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:39,850 INFO L124 PetriNetUnfolderBase]: 151/255 cut-off events. [2023-08-26 17:55:39,850 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:55:39,851 INFO L83 FinitePrefix]: Finished finitePrefix Result has 520 conditions, 255 events. 151/255 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 20. Compared 916 event pairs, 111 based on Foata normal form. 0/226 useless extension candidates. Maximal degree in co-relation 516. Up to 245 conditions per place. [2023-08-26 17:55:39,853 INFO L140 encePairwiseOnDemand]: 129/131 looper letters, 13 selfloop transitions, 1 changer transitions 0/18 dead transitions. [2023-08-26 17:55:39,853 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 24 places, 18 transitions, 71 flow [2023-08-26 17:55:39,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:55:39,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:55:39,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 141 transitions. [2023-08-26 17:55:39,855 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.35877862595419846 [2023-08-26 17:55:39,855 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 141 transitions. [2023-08-26 17:55:39,855 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 141 transitions. [2023-08-26 17:55:39,855 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:39,855 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 141 transitions. [2023-08-26 17:55:39,856 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 47.0) internal successors, (141), 3 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:39,857 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 131.0) internal successors, (524), 4 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 17:55:39,858 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 131.0) internal successors, (524), 4 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 17:55:39,858 INFO L175 Difference]: Start difference. First operand has 23 places, 19 transitions, 45 flow. Second operand 3 states and 141 transitions. [2023-08-26 17:55:39,858 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 24 places, 18 transitions, 71 flow [2023-08-26 17:55:39,858 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 24 places, 18 transitions, 71 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 17:55:39,859 INFO L231 Difference]: Finished difference. Result has 24 places, 18 transitions, 45 flow [2023-08-26 17:55:39,859 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=131, PETRI_DIFFERENCE_MINUEND_FLOW=43, PETRI_DIFFERENCE_MINUEND_PLACES=22, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=18, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=17, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=45, PETRI_PLACES=24, PETRI_TRANSITIONS=18} [2023-08-26 17:55:39,860 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, -6 predicate places. [2023-08-26 17:55:39,860 INFO L495 AbstractCegarLoop]: Abstraction has has 24 places, 18 transitions, 45 flow [2023-08-26 17:55:39,860 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 43.333333333333336) internal successors, (130), 3 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:39,860 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:39,860 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:55:39,860 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 17:55:39,861 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 17:55:39,861 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:39,861 INFO L85 PathProgramCache]: Analyzing trace with hash 11359253, now seen corresponding path program 1 times [2023-08-26 17:55:39,861 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:39,862 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704659437] [2023-08-26 17:55:39,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:39,862 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:39,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:39,906 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 17:55:39,906 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:39,906 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704659437] [2023-08-26 17:55:39,906 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704659437] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:39,906 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:39,907 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:55:39,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552967824] [2023-08-26 17:55:39,907 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:39,907 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:39,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:39,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:39,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:39,908 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 41 out of 131 [2023-08-26 17:55:39,909 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 18 transitions, 45 flow. Second operand has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 3 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:39,909 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:39,909 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 41 of 131 [2023-08-26 17:55:39,909 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:39,939 INFO L124 PetriNetUnfolderBase]: 107/187 cut-off events. [2023-08-26 17:55:39,939 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:55:39,940 INFO L83 FinitePrefix]: Finished finitePrefix Result has 386 conditions, 187 events. 107/187 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 619 event pairs, 77 based on Foata normal form. 0/182 useless extension candidates. Maximal degree in co-relation 381. Up to 177 conditions per place. [2023-08-26 17:55:39,941 INFO L140 encePairwiseOnDemand]: 129/131 looper letters, 12 selfloop transitions, 1 changer transitions 0/17 dead transitions. [2023-08-26 17:55:39,941 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 17 transitions, 69 flow [2023-08-26 17:55:39,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:55:39,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:55:39,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 137 transitions. [2023-08-26 17:55:39,943 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3486005089058524 [2023-08-26 17:55:39,943 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 137 transitions. [2023-08-26 17:55:39,943 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 137 transitions. [2023-08-26 17:55:39,943 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:39,943 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 137 transitions. [2023-08-26 17:55:39,944 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 45.666666666666664) internal successors, (137), 3 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:39,945 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 131.0) internal successors, (524), 4 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 17:55:39,946 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 131.0) internal successors, (524), 4 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 17:55:39,946 INFO L175 Difference]: Start difference. First operand has 24 places, 18 transitions, 45 flow. Second operand 3 states and 137 transitions. [2023-08-26 17:55:39,946 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 17 transitions, 69 flow [2023-08-26 17:55:39,946 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 24 places, 17 transitions, 68 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:39,947 INFO L231 Difference]: Finished difference. Result has 24 places, 17 transitions, 44 flow [2023-08-26 17:55:39,947 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=131, PETRI_DIFFERENCE_MINUEND_FLOW=42, PETRI_DIFFERENCE_MINUEND_PLACES=22, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=17, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=16, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=44, PETRI_PLACES=24, PETRI_TRANSITIONS=17} [2023-08-26 17:55:39,948 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, -6 predicate places. [2023-08-26 17:55:39,948 INFO L495 AbstractCegarLoop]: Abstraction has has 24 places, 17 transitions, 44 flow [2023-08-26 17:55:39,948 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 3 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:39,948 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:39,948 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 17:55:39,949 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-08-26 17:55:39,949 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 17:55:39,949 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:39,949 INFO L85 PathProgramCache]: Analyzing trace with hash 352090642, now seen corresponding path program 1 times [2023-08-26 17:55:39,950 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:39,950 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791616593] [2023-08-26 17:55:39,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:39,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:39,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:40,010 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 17:55:40,011 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:40,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791616593] [2023-08-26 17:55:40,011 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1791616593] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:40,011 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:40,011 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:55:40,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209377147] [2023-08-26 17:55:40,012 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:40,012 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:40,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:40,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:40,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:40,013 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 47 out of 131 [2023-08-26 17:55:40,016 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 17 transitions, 44 flow. Second operand has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 3 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:40,016 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:40,016 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 47 of 131 [2023-08-26 17:55:40,017 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:40,063 INFO L124 PetriNetUnfolderBase]: 152/257 cut-off events. [2023-08-26 17:55:40,063 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:55:40,064 INFO L83 FinitePrefix]: Finished finitePrefix Result has 528 conditions, 257 events. 152/257 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 816 event pairs, 40 based on Foata normal form. 0/241 useless extension candidates. Maximal degree in co-relation 523. Up to 173 conditions per place. [2023-08-26 17:55:40,065 INFO L140 encePairwiseOnDemand]: 128/131 looper letters, 19 selfloop transitions, 2 changer transitions 0/24 dead transitions. [2023-08-26 17:55:40,066 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 26 places, 24 transitions, 100 flow [2023-08-26 17:55:40,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:55:40,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:55:40,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 163 transitions. [2023-08-26 17:55:40,067 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.41475826972010177 [2023-08-26 17:55:40,067 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 163 transitions. [2023-08-26 17:55:40,067 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 163 transitions. [2023-08-26 17:55:40,068 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:40,068 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 163 transitions. [2023-08-26 17:55:40,068 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 54.333333333333336) internal successors, (163), 3 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:40,069 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 131.0) internal successors, (524), 4 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 17:55:40,070 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 131.0) internal successors, (524), 4 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 17:55:40,070 INFO L175 Difference]: Start difference. First operand has 24 places, 17 transitions, 44 flow. Second operand 3 states and 163 transitions. [2023-08-26 17:55:40,070 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 26 places, 24 transitions, 100 flow [2023-08-26 17:55:40,070 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 25 places, 24 transitions, 99 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:40,071 INFO L231 Difference]: Finished difference. Result has 26 places, 18 transitions, 55 flow [2023-08-26 17:55:40,071 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=131, PETRI_DIFFERENCE_MINUEND_FLOW=43, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=17, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=55, PETRI_PLACES=26, PETRI_TRANSITIONS=18} [2023-08-26 17:55:40,072 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, -4 predicate places. [2023-08-26 17:55:40,072 INFO L495 AbstractCegarLoop]: Abstraction has has 26 places, 18 transitions, 55 flow [2023-08-26 17:55:40,072 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 3 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:40,072 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:40,073 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:40,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 17:55:40,073 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 17:55:40,073 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:40,073 INFO L85 PathProgramCache]: Analyzing trace with hash 1350238485, now seen corresponding path program 1 times [2023-08-26 17:55:40,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:40,074 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704809539] [2023-08-26 17:55:40,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:40,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:40,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:40,140 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 17:55:40,140 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:40,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704809539] [2023-08-26 17:55:40,141 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704809539] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:40,141 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:40,141 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 17:55:40,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282304167] [2023-08-26 17:55:40,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:40,141 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:40,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:40,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:40,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:40,142 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 53 out of 131 [2023-08-26 17:55:40,143 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 26 places, 18 transitions, 55 flow. Second operand has 3 states, 3 states have (on average 56.0) internal successors, (168), 3 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:40,143 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:40,143 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 53 of 131 [2023-08-26 17:55:40,143 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:40,172 INFO L124 PetriNetUnfolderBase]: 51/121 cut-off events. [2023-08-26 17:55:40,172 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:55:40,172 INFO L83 FinitePrefix]: Finished finitePrefix Result has 268 conditions, 121 events. 51/121 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 343 event pairs, 11 based on Foata normal form. 33/151 useless extension candidates. Maximal degree in co-relation 262. Up to 75 conditions per place. [2023-08-26 17:55:40,173 INFO L140 encePairwiseOnDemand]: 127/131 looper letters, 14 selfloop transitions, 4 changer transitions 0/22 dead transitions. [2023-08-26 17:55:40,173 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 28 places, 22 transitions, 102 flow [2023-08-26 17:55:40,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:55:40,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:55:40,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 178 transitions. [2023-08-26 17:55:40,175 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4529262086513995 [2023-08-26 17:55:40,175 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 178 transitions. [2023-08-26 17:55:40,175 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 178 transitions. [2023-08-26 17:55:40,175 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:40,175 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 178 transitions. [2023-08-26 17:55:40,176 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 59.333333333333336) internal successors, (178), 3 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:40,177 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 131.0) internal successors, (524), 4 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 17:55:40,177 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 131.0) internal successors, (524), 4 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 17:55:40,177 INFO L175 Difference]: Start difference. First operand has 26 places, 18 transitions, 55 flow. Second operand 3 states and 178 transitions. [2023-08-26 17:55:40,177 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 28 places, 22 transitions, 102 flow [2023-08-26 17:55:40,178 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 22 transitions, 100 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:40,178 INFO L231 Difference]: Finished difference. Result has 27 places, 18 transitions, 61 flow [2023-08-26 17:55:40,178 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=131, PETRI_DIFFERENCE_MINUEND_FLOW=53, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=18, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=14, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=61, PETRI_PLACES=27, PETRI_TRANSITIONS=18} [2023-08-26 17:55:40,179 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, -3 predicate places. [2023-08-26 17:55:40,179 INFO L495 AbstractCegarLoop]: Abstraction has has 27 places, 18 transitions, 61 flow [2023-08-26 17:55:40,179 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 56.0) internal successors, (168), 3 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:40,180 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:40,180 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:40,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 17:55:40,180 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 17:55:40,180 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:40,180 INFO L85 PathProgramCache]: Analyzing trace with hash -1228890645, now seen corresponding path program 1 times [2023-08-26 17:55:40,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:40,181 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585942638] [2023-08-26 17:55:40,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:40,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:40,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:40,243 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 17:55:40,243 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:40,243 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585942638] [2023-08-26 17:55:40,244 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1585942638] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:40,244 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:40,244 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 17:55:40,244 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86191042] [2023-08-26 17:55:40,244 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:40,244 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:55:40,245 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:40,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:55:40,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:55:40,246 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 45 out of 131 [2023-08-26 17:55:40,246 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 18 transitions, 61 flow. Second operand has 5 states, 5 states have (on average 47.2) internal successors, (236), 5 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:40,246 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:40,246 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 45 of 131 [2023-08-26 17:55:40,246 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:40,320 INFO L124 PetriNetUnfolderBase]: 84/184 cut-off events. [2023-08-26 17:55:40,320 INFO L125 PetriNetUnfolderBase]: For 15/15 co-relation queries the response was YES. [2023-08-26 17:55:40,321 INFO L83 FinitePrefix]: Finished finitePrefix Result has 470 conditions, 184 events. 84/184 cut-off events. For 15/15 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 540 event pairs, 18 based on Foata normal form. 3/185 useless extension candidates. Maximal degree in co-relation 464. Up to 68 conditions per place. [2023-08-26 17:55:40,322 INFO L140 encePairwiseOnDemand]: 127/131 looper letters, 28 selfloop transitions, 4 changer transitions 0/35 dead transitions. [2023-08-26 17:55:40,322 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 35 transitions, 175 flow [2023-08-26 17:55:40,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 17:55:40,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 17:55:40,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 258 transitions. [2023-08-26 17:55:40,323 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3938931297709924 [2023-08-26 17:55:40,323 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 258 transitions. [2023-08-26 17:55:40,323 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 258 transitions. [2023-08-26 17:55:40,324 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:40,324 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 258 transitions. [2023-08-26 17:55:40,325 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 51.6) internal successors, (258), 5 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:40,326 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 131.0) internal successors, (786), 6 states have internal predecessors, (786), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:40,326 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 131.0) internal successors, (786), 6 states have internal predecessors, (786), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:40,327 INFO L175 Difference]: Start difference. First operand has 27 places, 18 transitions, 61 flow. Second operand 5 states and 258 transitions. [2023-08-26 17:55:40,327 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 35 transitions, 175 flow [2023-08-26 17:55:40,328 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 35 transitions, 164 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:40,328 INFO L231 Difference]: Finished difference. Result has 32 places, 20 transitions, 81 flow [2023-08-26 17:55:40,328 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=131, PETRI_DIFFERENCE_MINUEND_FLOW=57, PETRI_DIFFERENCE_MINUEND_PLACES=26, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=18, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=14, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=81, PETRI_PLACES=32, PETRI_TRANSITIONS=20} [2023-08-26 17:55:40,329 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 2 predicate places. [2023-08-26 17:55:40,329 INFO L495 AbstractCegarLoop]: Abstraction has has 32 places, 20 transitions, 81 flow [2023-08-26 17:55:40,329 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 47.2) internal successors, (236), 5 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:40,330 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:40,330 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:40,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 17:55:40,330 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 17:55:40,330 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:40,331 INFO L85 PathProgramCache]: Analyzing trace with hash -414587575, now seen corresponding path program 2 times [2023-08-26 17:55:40,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:40,331 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091287924] [2023-08-26 17:55:40,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:40,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:40,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:40,446 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:40,446 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:40,446 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091287924] [2023-08-26 17:55:40,446 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091287924] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:55:40,447 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [793078902] [2023-08-26 17:55:40,447 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 17:55:40,447 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:55:40,447 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:55:40,453 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 17:55:40,485 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 17:55:40,552 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 17:55:40,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 17:55:40,554 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2023-08-26 17:55:40,557 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:55:40,714 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:40,714 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:55:40,798 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:40,798 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [793078902] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:55:40,798 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:55:40,799 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2023-08-26 17:55:40,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165081075] [2023-08-26 17:55:40,799 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:55:40,800 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-08-26 17:55:40,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:40,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-08-26 17:55:40,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2023-08-26 17:55:40,802 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 131 [2023-08-26 17:55:40,803 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 32 places, 20 transitions, 81 flow. Second operand has 17 states, 17 states have (on average 46.64705882352941) internal successors, (793), 17 states have internal predecessors, (793), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:40,803 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:40,803 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 131 [2023-08-26 17:55:40,804 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:41,013 INFO L124 PetriNetUnfolderBase]: 110/240 cut-off events. [2023-08-26 17:55:41,013 INFO L125 PetriNetUnfolderBase]: For 59/59 co-relation queries the response was YES. [2023-08-26 17:55:41,014 INFO L83 FinitePrefix]: Finished finitePrefix Result has 617 conditions, 240 events. 110/240 cut-off events. For 59/59 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 716 event pairs, 18 based on Foata normal form. 3/241 useless extension candidates. Maximal degree in co-relation 608. Up to 68 conditions per place. [2023-08-26 17:55:41,015 INFO L140 encePairwiseOnDemand]: 127/131 looper letters, 37 selfloop transitions, 6 changer transitions 0/46 dead transitions. [2023-08-26 17:55:41,015 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 38 places, 46 transitions, 236 flow [2023-08-26 17:55:41,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 17:55:41,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 17:55:41,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 352 transitions. [2023-08-26 17:55:41,020 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.38386041439476554 [2023-08-26 17:55:41,020 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 352 transitions. [2023-08-26 17:55:41,021 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 352 transitions. [2023-08-26 17:55:41,021 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:41,021 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 352 transitions. [2023-08-26 17:55:41,023 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 50.285714285714285) internal successors, (352), 7 states have internal predecessors, (352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:41,024 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 131.0) internal successors, (1048), 8 states have internal predecessors, (1048), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:41,026 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 131.0) internal successors, (1048), 8 states have internal predecessors, (1048), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:41,026 INFO L175 Difference]: Start difference. First operand has 32 places, 20 transitions, 81 flow. Second operand 7 states and 352 transitions. [2023-08-26 17:55:41,026 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 38 places, 46 transitions, 236 flow [2023-08-26 17:55:41,029 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 36 places, 46 transitions, 230 flow, removed 1 selfloop flow, removed 2 redundant places. [2023-08-26 17:55:41,030 INFO L231 Difference]: Finished difference. Result has 38 places, 22 transitions, 107 flow [2023-08-26 17:55:41,030 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=131, PETRI_DIFFERENCE_MINUEND_FLOW=75, PETRI_DIFFERENCE_MINUEND_PLACES=30, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=14, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=107, PETRI_PLACES=38, PETRI_TRANSITIONS=22} [2023-08-26 17:55:41,031 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 8 predicate places. [2023-08-26 17:55:41,031 INFO L495 AbstractCegarLoop]: Abstraction has has 38 places, 22 transitions, 107 flow [2023-08-26 17:55:41,032 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 46.64705882352941) internal successors, (793), 17 states have internal predecessors, (793), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:41,032 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:41,032 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:41,044 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 17:55:41,238 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:55:41,238 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 17:55:41,238 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:41,238 INFO L85 PathProgramCache]: Analyzing trace with hash 699300347, now seen corresponding path program 3 times [2023-08-26 17:55:41,238 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:41,239 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831083751] [2023-08-26 17:55:41,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:41,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:41,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:41,393 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:41,393 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:41,393 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831083751] [2023-08-26 17:55:41,394 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831083751] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:55:41,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266458795] [2023-08-26 17:55:41,394 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-08-26 17:55:41,394 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:55:41,394 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:55:41,395 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 17:55:41,423 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 17:55:41,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-08-26 17:55:41,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 17:55:41,501 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 11 conjunts are in the unsatisfiable core [2023-08-26 17:55:41,502 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:55:41,631 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:41,631 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:55:41,737 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:41,737 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [266458795] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:55:41,737 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:55:41,737 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 19 [2023-08-26 17:55:41,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612098406] [2023-08-26 17:55:41,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:55:41,738 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-08-26 17:55:41,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:41,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-08-26 17:55:41,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2023-08-26 17:55:41,740 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 131 [2023-08-26 17:55:41,741 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 38 places, 22 transitions, 107 flow. Second operand has 21 states, 21 states have (on average 46.714285714285715) internal successors, (981), 21 states have internal predecessors, (981), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:41,741 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:41,741 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 131 [2023-08-26 17:55:41,742 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:42,017 INFO L124 PetriNetUnfolderBase]: 160/347 cut-off events. [2023-08-26 17:55:42,017 INFO L125 PetriNetUnfolderBase]: For 176/176 co-relation queries the response was YES. [2023-08-26 17:55:42,018 INFO L83 FinitePrefix]: Finished finitePrefix Result has 947 conditions, 347 events. 160/347 cut-off events. For 176/176 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 1046 event pairs, 18 based on Foata normal form. 9/354 useless extension candidates. Maximal degree in co-relation 936. Up to 92 conditions per place. [2023-08-26 17:55:42,019 INFO L140 encePairwiseOnDemand]: 127/131 looper letters, 0 selfloop transitions, 0 changer transitions 51/51 dead transitions. [2023-08-26 17:55:42,019 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 51 transitions, 286 flow [2023-08-26 17:55:42,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-08-26 17:55:42,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2023-08-26 17:55:42,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 443 transitions. [2023-08-26 17:55:42,021 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3757421543681086 [2023-08-26 17:55:42,022 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 443 transitions. [2023-08-26 17:55:42,022 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 443 transitions. [2023-08-26 17:55:42,022 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:42,022 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 443 transitions. [2023-08-26 17:55:42,023 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 49.22222222222222) internal successors, (443), 9 states have internal predecessors, (443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:42,025 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 131.0) internal successors, (1310), 10 states have internal predecessors, (1310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:42,027 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 131.0) internal successors, (1310), 10 states have internal predecessors, (1310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:42,027 INFO L175 Difference]: Start difference. First operand has 38 places, 22 transitions, 107 flow. Second operand 9 states and 443 transitions. [2023-08-26 17:55:42,027 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 51 transitions, 286 flow [2023-08-26 17:55:42,031 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 41 places, 51 transitions, 272 flow, removed 3 selfloop flow, removed 4 redundant places. [2023-08-26 17:55:42,032 INFO L231 Difference]: Finished difference. Result has 41 places, 0 transitions, 0 flow [2023-08-26 17:55:42,032 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=131, PETRI_DIFFERENCE_MINUEND_FLOW=85, PETRI_DIFFERENCE_MINUEND_PLACES=33, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=21, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=21, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=0, PETRI_PLACES=41, PETRI_TRANSITIONS=0} [2023-08-26 17:55:42,034 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 11 predicate places. [2023-08-26 17:55:42,036 INFO L495 AbstractCegarLoop]: Abstraction has has 41 places, 0 transitions, 0 flow [2023-08-26 17:55:42,036 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 46.714285714285715) internal successors, (981), 21 states have internal predecessors, (981), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:42,040 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 6 remaining) [2023-08-26 17:55:42,041 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 6 remaining) [2023-08-26 17:55:42,041 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 6 remaining) [2023-08-26 17:55:42,041 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 6 remaining) [2023-08-26 17:55:42,042 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 6 remaining) [2023-08-26 17:55:42,042 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 6 remaining) [2023-08-26 17:55:42,056 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-26 17:55:42,251 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-08-26 17:55:42,251 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1, 1, 1, 1, 1] [2023-08-26 17:55:42,253 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 17:55:42,257 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 68 places, 69 transitions, 148 flow [2023-08-26 17:55:42,263 INFO L124 PetriNetUnfolderBase]: 8/80 cut-off events. [2023-08-26 17:55:42,263 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:55:42,263 INFO L83 FinitePrefix]: Finished finitePrefix Result has 88 conditions, 80 events. 8/80 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 152 event pairs, 0 based on Foata normal form. 0/63 useless extension candidates. Maximal degree in co-relation 62. Up to 4 conditions per place. [2023-08-26 17:55:42,264 INFO L82 GeneralOperation]: Start removeDead. Operand has 68 places, 69 transitions, 148 flow [2023-08-26 17:55:42,264 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 65 places, 66 transitions, 140 flow [2023-08-26 17:55:42,264 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:55:42,264 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 65 places, 66 transitions, 140 flow [2023-08-26 17:55:42,265 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 65 places, 66 transitions, 140 flow [2023-08-26 17:55:42,265 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 65 places, 66 transitions, 140 flow [2023-08-26 17:55:42,270 INFO L124 PetriNetUnfolderBase]: 8/78 cut-off events. [2023-08-26 17:55:42,270 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:55:42,271 INFO L83 FinitePrefix]: Finished finitePrefix Result has 86 conditions, 78 events. 8/78 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 147 event pairs, 0 based on Foata normal form. 0/63 useless extension candidates. Maximal degree in co-relation 62. Up to 4 conditions per place. [2023-08-26 17:55:42,271 INFO L119 LiptonReduction]: Number of co-enabled transitions 1380 [2023-08-26 17:55:43,432 INFO L134 LiptonReduction]: Checked pairs total: 2278 [2023-08-26 17:55:43,432 INFO L136 LiptonReduction]: Total number of compositions: 56 [2023-08-26 17:55:43,435 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 17:55:43,435 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;@1d1ae1a2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:55:43,437 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-08-26 17:55:43,440 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:55:43,440 INFO L124 PetriNetUnfolderBase]: 3/27 cut-off events. [2023-08-26 17:55:43,440 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:55:43,440 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:43,440 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:43,440 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 17:55:43,441 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:43,441 INFO L85 PathProgramCache]: Analyzing trace with hash 296800097, now seen corresponding path program 1 times [2023-08-26 17:55:43,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:43,441 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680821388] [2023-08-26 17:55:43,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:43,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:43,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:55:43,458 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 17:55:43,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:55:43,485 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 17:55:43,485 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 17:55:43,485 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2023-08-26 17:55:43,485 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 2 remaining) [2023-08-26 17:55:43,485 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 17:55:43,486 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 17:55:43,486 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE,UNKNOWN (2/2) [2023-08-26 17:55:43,488 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 17:55:43,488 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 17:55:43,509 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:55:43,513 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 97 places, 100 transitions, 224 flow [2023-08-26 17:55:43,523 INFO L124 PetriNetUnfolderBase]: 11/107 cut-off events. [2023-08-26 17:55:43,523 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:55:43,524 INFO L83 FinitePrefix]: Finished finitePrefix Result has 121 conditions, 107 events. 11/107 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 220 event pairs, 0 based on Foata normal form. 0/84 useless extension candidates. Maximal degree in co-relation 116. Up to 6 conditions per place. [2023-08-26 17:55:43,524 INFO L82 GeneralOperation]: Start removeDead. Operand has 97 places, 100 transitions, 224 flow [2023-08-26 17:55:43,525 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 80 places, 81 transitions, 177 flow [2023-08-26 17:55:43,525 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:55:43,526 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 80 places, 81 transitions, 177 flow [2023-08-26 17:55:43,526 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 80 places, 81 transitions, 177 flow [2023-08-26 17:55:43,526 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 80 places, 81 transitions, 177 flow [2023-08-26 17:55:43,535 INFO L124 PetriNetUnfolderBase]: 11/107 cut-off events. [2023-08-26 17:55:43,535 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:55:43,536 INFO L83 FinitePrefix]: Finished finitePrefix Result has 120 conditions, 107 events. 11/107 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 220 event pairs, 0 based on Foata normal form. 0/84 useless extension candidates. Maximal degree in co-relation 93. Up to 6 conditions per place. [2023-08-26 17:55:43,537 INFO L119 LiptonReduction]: Number of co-enabled transitions 2494 [2023-08-26 17:55:44,772 INFO L134 LiptonReduction]: Checked pairs total: 6819 [2023-08-26 17:55:44,772 INFO L136 LiptonReduction]: Total number of compositions: 64 [2023-08-26 17:55:44,774 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:55:44,774 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;@1d1ae1a2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:55:44,774 INFO L358 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2023-08-26 17:55:44,775 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:55:44,775 INFO L124 PetriNetUnfolderBase]: 0/0 cut-off events. [2023-08-26 17:55:44,775 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:55:44,775 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:44,775 INFO L208 CegarLoopForPetriNet]: trace histogram [1] [2023-08-26 17:55:44,775 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2023-08-26 17:55:44,775 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:44,775 INFO L85 PathProgramCache]: Analyzing trace with hash 624, now seen corresponding path program 1 times [2023-08-26 17:55:44,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:44,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668093833] [2023-08-26 17:55:44,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:44,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:44,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:44,780 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 17:55:44,780 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:44,780 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1668093833] [2023-08-26 17:55:44,780 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1668093833] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:44,780 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:44,780 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [0] imperfect sequences [] total 0 [2023-08-26 17:55:44,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044967626] [2023-08-26 17:55:44,781 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:44,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-26 17:55:44,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:44,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-26 17:55:44,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-26 17:55:44,782 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 72 out of 164 [2023-08-26 17:55:44,782 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 43 places, 40 transitions, 95 flow. Second operand has 2 states, 2 states have (on average 72.5) internal successors, (145), 2 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:44,782 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:44,782 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 72 of 164 [2023-08-26 17:55:44,782 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:44,867 INFO L124 PetriNetUnfolderBase]: 555/1179 cut-off events. [2023-08-26 17:55:44,867 INFO L125 PetriNetUnfolderBase]: For 59/59 co-relation queries the response was YES. [2023-08-26 17:55:44,869 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2074 conditions, 1179 events. 555/1179 cut-off events. For 59/59 co-relation queries the response was YES. Maximal size of possible extension queue 84. Compared 7449 event pairs, 370 based on Foata normal form. 50/1047 useless extension candidates. Maximal degree in co-relation 2063. Up to 804 conditions per place. [2023-08-26 17:55:44,874 INFO L140 encePairwiseOnDemand]: 156/164 looper letters, 16 selfloop transitions, 0 changer transitions 0/31 dead transitions. [2023-08-26 17:55:44,874 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 31 transitions, 109 flow [2023-08-26 17:55:44,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-26 17:55:44,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-26 17:55:44,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 168 transitions. [2023-08-26 17:55:44,876 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5121951219512195 [2023-08-26 17:55:44,876 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 168 transitions. [2023-08-26 17:55:44,876 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 168 transitions. [2023-08-26 17:55:44,876 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:44,876 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 168 transitions. [2023-08-26 17:55:44,877 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 84.0) internal successors, (168), 2 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:44,877 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 164.0) internal successors, (492), 3 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:44,877 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 164.0) internal successors, (492), 3 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:44,877 INFO L175 Difference]: Start difference. First operand has 43 places, 40 transitions, 95 flow. Second operand 2 states and 168 transitions. [2023-08-26 17:55:44,878 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 31 transitions, 109 flow [2023-08-26 17:55:44,878 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 36 places, 31 transitions, 106 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:44,879 INFO L231 Difference]: Finished difference. Result has 36 places, 31 transitions, 74 flow [2023-08-26 17:55:44,879 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=164, PETRI_DIFFERENCE_MINUEND_FLOW=74, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=74, PETRI_PLACES=36, PETRI_TRANSITIONS=31} [2023-08-26 17:55:44,879 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, -7 predicate places. [2023-08-26 17:55:44,879 INFO L495 AbstractCegarLoop]: Abstraction has has 36 places, 31 transitions, 74 flow [2023-08-26 17:55:44,880 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 72.5) internal successors, (145), 2 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:44,880 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:44,880 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:55:44,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 17:55:44,880 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2023-08-26 17:55:44,880 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:44,880 INFO L85 PathProgramCache]: Analyzing trace with hash 19052278, now seen corresponding path program 1 times [2023-08-26 17:55:44,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:44,881 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973438094] [2023-08-26 17:55:44,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:44,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:44,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:44,900 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 17:55:44,900 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:44,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973438094] [2023-08-26 17:55:44,901 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973438094] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:44,901 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:44,901 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:55:44,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428028166] [2023-08-26 17:55:44,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:44,901 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:44,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:44,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:44,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:44,902 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 59 out of 164 [2023-08-26 17:55:44,902 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 36 places, 31 transitions, 74 flow. Second operand has 3 states, 3 states have (on average 60.333333333333336) internal successors, (181), 3 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:44,902 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:44,903 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 59 of 164 [2023-08-26 17:55:44,903 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:44,973 INFO L124 PetriNetUnfolderBase]: 402/881 cut-off events. [2023-08-26 17:55:44,973 INFO L125 PetriNetUnfolderBase]: For 44/44 co-relation queries the response was YES. [2023-08-26 17:55:44,975 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1543 conditions, 881 events. 402/881 cut-off events. For 44/44 co-relation queries the response was YES. Maximal size of possible extension queue 64. Compared 5256 event pairs, 265 based on Foata normal form. 0/765 useless extension candidates. Maximal degree in co-relation 1538. Up to 585 conditions per place. [2023-08-26 17:55:44,979 INFO L140 encePairwiseOnDemand]: 162/164 looper letters, 14 selfloop transitions, 1 changer transitions 0/30 dead transitions. [2023-08-26 17:55:44,979 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 30 transitions, 102 flow [2023-08-26 17:55:44,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:55:44,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:55:44,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 193 transitions. [2023-08-26 17:55:44,980 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.39227642276422764 [2023-08-26 17:55:44,980 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 193 transitions. [2023-08-26 17:55:44,980 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 193 transitions. [2023-08-26 17:55:44,980 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:44,980 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 193 transitions. [2023-08-26 17:55:44,981 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 64.33333333333333) internal successors, (193), 3 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 17:55:44,982 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 164.0) internal successors, (656), 4 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:44,982 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 164.0) internal successors, (656), 4 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:44,982 INFO L175 Difference]: Start difference. First operand has 36 places, 31 transitions, 74 flow. Second operand 3 states and 193 transitions. [2023-08-26 17:55:44,982 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 30 transitions, 102 flow [2023-08-26 17:55:44,983 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 30 transitions, 102 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 17:55:44,983 INFO L231 Difference]: Finished difference. Result has 37 places, 30 transitions, 74 flow [2023-08-26 17:55:44,983 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=164, PETRI_DIFFERENCE_MINUEND_FLOW=72, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=74, PETRI_PLACES=37, PETRI_TRANSITIONS=30} [2023-08-26 17:55:44,984 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, -6 predicate places. [2023-08-26 17:55:44,984 INFO L495 AbstractCegarLoop]: Abstraction has has 37 places, 30 transitions, 74 flow [2023-08-26 17:55:44,984 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 60.333333333333336) internal successors, (181), 3 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:44,984 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:44,984 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:55:44,984 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-08-26 17:55:44,985 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2023-08-26 17:55:44,985 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:44,985 INFO L85 PathProgramCache]: Analyzing trace with hash 19052277, now seen corresponding path program 1 times [2023-08-26 17:55:44,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:44,985 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760645530] [2023-08-26 17:55:44,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:44,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:44,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:45,005 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 17:55:45,006 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:45,006 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760645530] [2023-08-26 17:55:45,006 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760645530] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:45,006 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:45,006 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:55:45,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664987358] [2023-08-26 17:55:45,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:45,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:45,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:45,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:45,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:45,008 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 60 out of 164 [2023-08-26 17:55:45,008 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 30 transitions, 74 flow. Second operand has 3 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 17:55:45,008 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:45,008 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 60 of 164 [2023-08-26 17:55:45,008 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:45,057 INFO L124 PetriNetUnfolderBase]: 249/583 cut-off events. [2023-08-26 17:55:45,057 INFO L125 PetriNetUnfolderBase]: For 44/44 co-relation queries the response was YES. [2023-08-26 17:55:45,058 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1029 conditions, 583 events. 249/583 cut-off events. For 44/44 co-relation queries the response was YES. Maximal size of possible extension queue 41. Compared 3142 event pairs, 160 based on Foata normal form. 0/533 useless extension candidates. Maximal degree in co-relation 1023. Up to 367 conditions per place. [2023-08-26 17:55:45,060 INFO L140 encePairwiseOnDemand]: 162/164 looper letters, 12 selfloop transitions, 1 changer transitions 1/29 dead transitions. [2023-08-26 17:55:45,060 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 38 places, 29 transitions, 100 flow [2023-08-26 17:55:45,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:55:45,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:55:45,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 195 transitions. [2023-08-26 17:55:45,062 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.39634146341463417 [2023-08-26 17:55:45,062 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 195 transitions. [2023-08-26 17:55:45,062 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 195 transitions. [2023-08-26 17:55:45,062 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:45,062 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 195 transitions. [2023-08-26 17:55:45,063 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 65.0) internal successors, (195), 3 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,063 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 164.0) internal successors, (656), 4 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,064 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 164.0) internal successors, (656), 4 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,064 INFO L175 Difference]: Start difference. First operand has 37 places, 30 transitions, 74 flow. Second operand 3 states and 195 transitions. [2023-08-26 17:55:45,064 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 38 places, 29 transitions, 100 flow [2023-08-26 17:55:45,064 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 29 transitions, 99 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:45,065 INFO L231 Difference]: Finished difference. Result has 37 places, 28 transitions, 71 flow [2023-08-26 17:55:45,065 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=164, PETRI_DIFFERENCE_MINUEND_FLOW=71, PETRI_DIFFERENCE_MINUEND_PLACES=35, 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=71, PETRI_PLACES=37, PETRI_TRANSITIONS=28} [2023-08-26 17:55:45,065 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, -6 predicate places. [2023-08-26 17:55:45,065 INFO L495 AbstractCegarLoop]: Abstraction has has 37 places, 28 transitions, 71 flow [2023-08-26 17:55:45,065 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 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 17:55:45,065 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:45,066 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 17:55:45,066 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 17:55:45,066 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2023-08-26 17:55:45,066 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:45,066 INFO L85 PathProgramCache]: Analyzing trace with hash 590574966, now seen corresponding path program 1 times [2023-08-26 17:55:45,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:45,066 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170021076] [2023-08-26 17:55:45,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:45,067 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:45,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:45,090 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 17:55:45,090 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:45,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170021076] [2023-08-26 17:55:45,090 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170021076] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:45,090 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:45,090 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:55:45,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089047965] [2023-08-26 17:55:45,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:45,091 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:45,091 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:45,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:45,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:45,092 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 60 out of 164 [2023-08-26 17:55:45,092 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 28 transitions, 71 flow. Second operand has 3 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 17:55:45,092 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:45,092 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 60 of 164 [2023-08-26 17:55:45,092 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:45,329 INFO L124 PetriNetUnfolderBase]: 1627/2452 cut-off events. [2023-08-26 17:55:45,330 INFO L125 PetriNetUnfolderBase]: For 136/136 co-relation queries the response was YES. [2023-08-26 17:55:45,334 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4925 conditions, 2452 events. 1627/2452 cut-off events. For 136/136 co-relation queries the response was YES. Maximal size of possible extension queue 161. Compared 12969 event pairs, 438 based on Foata normal form. 0/2366 useless extension candidates. Maximal degree in co-relation 4919. Up to 1463 conditions per place. [2023-08-26 17:55:45,345 INFO L140 encePairwiseOnDemand]: 157/164 looper letters, 29 selfloop transitions, 6 changer transitions 0/43 dead transitions. [2023-08-26 17:55:45,345 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 38 places, 43 transitions, 176 flow [2023-08-26 17:55:45,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:55:45,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:55:45,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 216 transitions. [2023-08-26 17:55:45,347 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43902439024390244 [2023-08-26 17:55:45,347 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 216 transitions. [2023-08-26 17:55:45,347 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 216 transitions. [2023-08-26 17:55:45,347 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:45,347 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 216 transitions. [2023-08-26 17:55:45,348 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 72.0) internal successors, (216), 3 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,349 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 164.0) internal successors, (656), 4 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,349 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 164.0) internal successors, (656), 4 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,349 INFO L175 Difference]: Start difference. First operand has 37 places, 28 transitions, 71 flow. Second operand 3 states and 216 transitions. [2023-08-26 17:55:45,350 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 38 places, 43 transitions, 176 flow [2023-08-26 17:55:45,350 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 43 transitions, 175 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:45,351 INFO L231 Difference]: Finished difference. Result has 39 places, 33 transitions, 116 flow [2023-08-26 17:55:45,351 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=164, PETRI_DIFFERENCE_MINUEND_FLOW=70, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=116, PETRI_PLACES=39, PETRI_TRANSITIONS=33} [2023-08-26 17:55:45,351 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, -4 predicate places. [2023-08-26 17:55:45,351 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 33 transitions, 116 flow [2023-08-26 17:55:45,352 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 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 17:55:45,352 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:45,352 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:45,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 17:55:45,352 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2023-08-26 17:55:45,352 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:45,353 INFO L85 PathProgramCache]: Analyzing trace with hash -1812494090, now seen corresponding path program 1 times [2023-08-26 17:55:45,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:45,353 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593542388] [2023-08-26 17:55:45,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:45,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:45,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:45,396 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 17:55:45,396 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:45,397 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593542388] [2023-08-26 17:55:45,397 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1593542388] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:45,397 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:45,397 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 17:55:45,399 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811157347] [2023-08-26 17:55:45,399 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:45,399 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:45,399 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:45,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:45,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:45,400 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 71 out of 164 [2023-08-26 17:55:45,401 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 39 places, 33 transitions, 116 flow. Second operand has 3 states, 3 states have (on average 73.66666666666667) internal successors, (221), 3 states have internal predecessors, (221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,401 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:45,402 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 71 of 164 [2023-08-26 17:55:45,402 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:45,453 INFO L124 PetriNetUnfolderBase]: 104/334 cut-off events. [2023-08-26 17:55:45,453 INFO L125 PetriNetUnfolderBase]: For 59/59 co-relation queries the response was YES. [2023-08-26 17:55:45,454 INFO L83 FinitePrefix]: Finished finitePrefix Result has 678 conditions, 334 events. 104/334 cut-off events. For 59/59 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 1637 event pairs, 15 based on Foata normal form. 101/431 useless extension candidates. Maximal degree in co-relation 671. Up to 121 conditions per place. [2023-08-26 17:55:45,455 INFO L140 encePairwiseOnDemand]: 158/164 looper letters, 11 selfloop transitions, 6 changer transitions 0/35 dead transitions. [2023-08-26 17:55:45,455 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 41 places, 35 transitions, 154 flow [2023-08-26 17:55:45,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:55:45,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:55:45,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 233 transitions. [2023-08-26 17:55:45,457 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4735772357723577 [2023-08-26 17:55:45,457 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 233 transitions. [2023-08-26 17:55:45,457 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 233 transitions. [2023-08-26 17:55:45,457 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:45,457 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 233 transitions. [2023-08-26 17:55:45,458 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 77.66666666666667) internal successors, (233), 3 states have internal predecessors, (233), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,459 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 164.0) internal successors, (656), 4 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,459 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 164.0) internal successors, (656), 4 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,459 INFO L175 Difference]: Start difference. First operand has 39 places, 33 transitions, 116 flow. Second operand 3 states and 233 transitions. [2023-08-26 17:55:45,459 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 41 places, 35 transitions, 154 flow [2023-08-26 17:55:45,461 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 35 transitions, 142 flow, removed 2 selfloop flow, removed 2 redundant places. [2023-08-26 17:55:45,462 INFO L231 Difference]: Finished difference. Result has 39 places, 31 transitions, 104 flow [2023-08-26 17:55:45,462 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=164, PETRI_DIFFERENCE_MINUEND_FLOW=92, PETRI_DIFFERENCE_MINUEND_PLACES=37, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=104, PETRI_PLACES=39, PETRI_TRANSITIONS=31} [2023-08-26 17:55:45,463 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, -4 predicate places. [2023-08-26 17:55:45,463 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 31 transitions, 104 flow [2023-08-26 17:55:45,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 73.66666666666667) internal successors, (221), 3 states have internal predecessors, (221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,464 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:45,464 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:45,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-26 17:55:45,464 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2023-08-26 17:55:45,464 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:45,464 INFO L85 PathProgramCache]: Analyzing trace with hash 2083925428, now seen corresponding path program 1 times [2023-08-26 17:55:45,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:45,465 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811102385] [2023-08-26 17:55:45,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:45,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:45,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:45,538 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 17:55:45,539 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:45,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811102385] [2023-08-26 17:55:45,539 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811102385] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:45,539 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:45,539 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 17:55:45,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229580333] [2023-08-26 17:55:45,539 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:45,540 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:55:45,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:45,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:55:45,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:55:45,541 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 164 [2023-08-26 17:55:45,541 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 39 places, 31 transitions, 104 flow. Second operand has 5 states, 5 states have (on average 59.6) internal successors, (298), 5 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,541 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:45,541 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 164 [2023-08-26 17:55:45,541 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:45,664 INFO L124 PetriNetUnfolderBase]: 315/714 cut-off events. [2023-08-26 17:55:45,664 INFO L125 PetriNetUnfolderBase]: For 164/164 co-relation queries the response was YES. [2023-08-26 17:55:45,666 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1859 conditions, 714 events. 315/714 cut-off events. For 164/164 co-relation queries the response was YES. Maximal size of possible extension queue 54. Compared 4336 event pairs, 33 based on Foata normal form. 0/702 useless extension candidates. Maximal degree in co-relation 1852. Up to 356 conditions per place. [2023-08-26 17:55:45,669 INFO L140 encePairwiseOnDemand]: 156/164 looper letters, 49 selfloop transitions, 11 changer transitions 0/66 dead transitions. [2023-08-26 17:55:45,669 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 66 transitions, 352 flow [2023-08-26 17:55:45,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 17:55:45,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 17:55:45,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 397 transitions. [2023-08-26 17:55:45,670 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4034552845528455 [2023-08-26 17:55:45,671 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 397 transitions. [2023-08-26 17:55:45,671 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 397 transitions. [2023-08-26 17:55:45,671 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:45,671 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 397 transitions. [2023-08-26 17:55:45,672 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 66.16666666666667) internal successors, (397), 6 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,673 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 164.0) internal successors, (1148), 7 states have internal predecessors, (1148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,673 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 164.0) internal successors, (1148), 7 states have internal predecessors, (1148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,673 INFO L175 Difference]: Start difference. First operand has 39 places, 31 transitions, 104 flow. Second operand 6 states and 397 transitions. [2023-08-26 17:55:45,673 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 66 transitions, 352 flow [2023-08-26 17:55:45,674 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 66 transitions, 336 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:45,675 INFO L231 Difference]: Finished difference. Result has 46 places, 41 transitions, 184 flow [2023-08-26 17:55:45,675 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=164, PETRI_DIFFERENCE_MINUEND_FLOW=98, PETRI_DIFFERENCE_MINUEND_PLACES=38, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=184, PETRI_PLACES=46, PETRI_TRANSITIONS=41} [2023-08-26 17:55:45,676 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, 3 predicate places. [2023-08-26 17:55:45,676 INFO L495 AbstractCegarLoop]: Abstraction has has 46 places, 41 transitions, 184 flow [2023-08-26 17:55:45,676 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 59.6) internal successors, (298), 5 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:45,676 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:45,676 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:45,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-26 17:55:45,676 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2023-08-26 17:55:45,677 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:45,677 INFO L85 PathProgramCache]: Analyzing trace with hash 1272149655, now seen corresponding path program 2 times [2023-08-26 17:55:45,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:45,677 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79901992] [2023-08-26 17:55:45,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:45,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:45,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:45,776 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:45,776 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:45,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79901992] [2023-08-26 17:55:45,776 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [79901992] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:55:45,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948551649] [2023-08-26 17:55:45,777 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 17:55:45,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:55:45,777 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:55:45,778 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 17:55:45,791 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 17:55:45,861 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 17:55:45,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 17:55:45,863 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2023-08-26 17:55:45,865 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:55:45,976 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:45,977 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:55:46,068 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:46,069 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1948551649] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:55:46,070 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:55:46,070 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2023-08-26 17:55:46,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615386392] [2023-08-26 17:55:46,070 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:55:46,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-08-26 17:55:46,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:46,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-08-26 17:55:46,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2023-08-26 17:55:46,074 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 56 out of 164 [2023-08-26 17:55:46,075 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 46 places, 41 transitions, 184 flow. Second operand has 20 states, 20 states have (on average 58.85) internal successors, (1177), 20 states have internal predecessors, (1177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:46,075 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:46,076 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 56 of 164 [2023-08-26 17:55:46,076 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:46,481 INFO L124 PetriNetUnfolderBase]: 459/1018 cut-off events. [2023-08-26 17:55:46,481 INFO L125 PetriNetUnfolderBase]: For 354/354 co-relation queries the response was YES. [2023-08-26 17:55:46,484 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2735 conditions, 1018 events. 459/1018 cut-off events. For 354/354 co-relation queries the response was YES. Maximal size of possible extension queue 60. Compared 6385 event pairs, 25 based on Foata normal form. 8/1022 useless extension candidates. Maximal degree in co-relation 2724. Up to 356 conditions per place. [2023-08-26 17:55:46,488 INFO L140 encePairwiseOnDemand]: 154/164 looper letters, 65 selfloop transitions, 23 changer transitions 0/94 dead transitions. [2023-08-26 17:55:46,488 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 56 places, 94 transitions, 561 flow [2023-08-26 17:55:46,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-08-26 17:55:46,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2023-08-26 17:55:46,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 696 transitions. [2023-08-26 17:55:46,491 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3858093126385809 [2023-08-26 17:55:46,491 INFO L72 ComplementDD]: Start complementDD. Operand 11 states and 696 transitions. [2023-08-26 17:55:46,491 INFO L73 IsDeterministic]: Start isDeterministic. Operand 11 states and 696 transitions. [2023-08-26 17:55:46,492 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:46,492 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 11 states and 696 transitions. [2023-08-26 17:55:46,493 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 12 states, 11 states have (on average 63.27272727272727) internal successors, (696), 11 states have internal predecessors, (696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:46,495 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 12 states, 12 states have (on average 164.0) internal successors, (1968), 12 states have internal predecessors, (1968), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:46,496 INFO L81 ComplementDD]: Finished complementDD. Result has 12 states, 12 states have (on average 164.0) internal successors, (1968), 12 states have internal predecessors, (1968), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:46,496 INFO L175 Difference]: Start difference. First operand has 46 places, 41 transitions, 184 flow. Second operand 11 states and 696 transitions. [2023-08-26 17:55:46,496 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 56 places, 94 transitions, 561 flow [2023-08-26 17:55:46,499 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 56 places, 94 transitions, 561 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 17:55:46,500 INFO L231 Difference]: Finished difference. Result has 61 places, 53 transitions, 327 flow [2023-08-26 17:55:46,500 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=164, PETRI_DIFFERENCE_MINUEND_FLOW=184, PETRI_DIFFERENCE_MINUEND_PLACES=46, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=11, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=11, PETRI_FLOW=327, PETRI_PLACES=61, PETRI_TRANSITIONS=53} [2023-08-26 17:55:46,501 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, 18 predicate places. [2023-08-26 17:55:46,502 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 53 transitions, 327 flow [2023-08-26 17:55:46,502 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 58.85) internal successors, (1177), 20 states have internal predecessors, (1177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:46,502 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:46,502 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:46,510 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-08-26 17:55:46,708 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 17:55:46,708 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 4 more)] === [2023-08-26 17:55:46,709 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:46,709 INFO L85 PathProgramCache]: Analyzing trace with hash 179010166, now seen corresponding path program 3 times [2023-08-26 17:55:46,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:46,709 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2036324931] [2023-08-26 17:55:46,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:46,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:46,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:46,851 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:46,851 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:46,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2036324931] [2023-08-26 17:55:46,851 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2036324931] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:55:46,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126817160] [2023-08-26 17:55:46,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-08-26 17:55:46,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:55:46,852 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:55:46,853 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 17:55:46,863 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 17:55:46,935 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-08-26 17:55:46,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 17:55:46,937 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 11 conjunts are in the unsatisfiable core [2023-08-26 17:55:46,938 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:55:47,111 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:47,111 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:55:47,233 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:47,233 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126817160] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:55:47,233 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:55:47,233 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8] total 22 [2023-08-26 17:55:47,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552970801] [2023-08-26 17:55:47,234 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:55:47,234 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-08-26 17:55:47,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:47,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-08-26 17:55:47,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=483, Unknown=0, NotChecked=0, Total=552 [2023-08-26 17:55:47,237 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 56 out of 164 [2023-08-26 17:55:47,239 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 53 transitions, 327 flow. Second operand has 24 states, 24 states have (on average 59.125) internal successors, (1419), 24 states have internal predecessors, (1419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:47,239 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:47,239 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 56 of 164 [2023-08-26 17:55:47,239 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:47,922 INFO L124 PetriNetUnfolderBase]: 742/1629 cut-off events. [2023-08-26 17:55:47,923 INFO L125 PetriNetUnfolderBase]: For 1171/1171 co-relation queries the response was YES. [2023-08-26 17:55:47,929 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5081 conditions, 1629 events. 742/1629 cut-off events. For 1171/1171 co-relation queries the response was YES. Maximal size of possible extension queue 62. Compared 10502 event pairs, 25 based on Foata normal form. 24/1649 useless extension candidates. Maximal degree in co-relation 5064. Up to 426 conditions per place. [2023-08-26 17:55:47,932 INFO L140 encePairwiseOnDemand]: 154/164 looper letters, 0 selfloop transitions, 0 changer transitions 117/117 dead transitions. [2023-08-26 17:55:47,932 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 117 transitions, 853 flow [2023-08-26 17:55:47,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-08-26 17:55:47,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2023-08-26 17:55:47,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 925 transitions. [2023-08-26 17:55:47,935 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.37601626016260165 [2023-08-26 17:55:47,935 INFO L72 ComplementDD]: Start complementDD. Operand 15 states and 925 transitions. [2023-08-26 17:55:47,935 INFO L73 IsDeterministic]: Start isDeterministic. Operand 15 states and 925 transitions. [2023-08-26 17:55:47,936 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:47,936 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 15 states and 925 transitions. [2023-08-26 17:55:47,938 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 16 states, 15 states have (on average 61.666666666666664) internal successors, (925), 15 states have internal predecessors, (925), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:47,941 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 16 states, 16 states have (on average 164.0) internal successors, (2624), 16 states have internal predecessors, (2624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:47,941 INFO L81 ComplementDD]: Finished complementDD. Result has 16 states, 16 states have (on average 164.0) internal successors, (2624), 16 states have internal predecessors, (2624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:47,941 INFO L175 Difference]: Start difference. First operand has 61 places, 53 transitions, 327 flow. Second operand 15 states and 925 transitions. [2023-08-26 17:55:47,942 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 117 transitions, 853 flow [2023-08-26 17:55:47,947 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 69 places, 117 transitions, 815 flow, removed 8 selfloop flow, removed 5 redundant places. [2023-08-26 17:55:47,948 INFO L231 Difference]: Finished difference. Result has 69 places, 0 transitions, 0 flow [2023-08-26 17:55:47,948 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=164, PETRI_DIFFERENCE_MINUEND_FLOW=281, PETRI_DIFFERENCE_MINUEND_PLACES=55, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=52, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=52, PETRI_DIFFERENCE_SUBTRAHEND_STATES=15, PETRI_FLOW=0, PETRI_PLACES=69, PETRI_TRANSITIONS=0} [2023-08-26 17:55:47,948 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, 26 predicate places. [2023-08-26 17:55:47,949 INFO L495 AbstractCegarLoop]: Abstraction has has 69 places, 0 transitions, 0 flow [2023-08-26 17:55:47,949 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 59.125) internal successors, (1419), 24 states have internal predecessors, (1419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:47,949 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (6 of 7 remaining) [2023-08-26 17:55:47,950 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 7 remaining) [2023-08-26 17:55:47,950 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 7 remaining) [2023-08-26 17:55:47,950 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 7 remaining) [2023-08-26 17:55:47,950 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 7 remaining) [2023-08-26 17:55:47,950 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 7 remaining) [2023-08-26 17:55:47,950 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 7 remaining) [2023-08-26 17:55:47,959 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-08-26 17:55:48,155 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 17:55:48,156 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1, 1, 1, 1, 1] [2023-08-26 17:55:48,156 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 17:55:48,158 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 97 places, 100 transitions, 224 flow [2023-08-26 17:55:48,166 INFO L124 PetriNetUnfolderBase]: 11/107 cut-off events. [2023-08-26 17:55:48,166 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:55:48,167 INFO L83 FinitePrefix]: Finished finitePrefix Result has 121 conditions, 107 events. 11/107 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 220 event pairs, 0 based on Foata normal form. 0/84 useless extension candidates. Maximal degree in co-relation 116. Up to 6 conditions per place. [2023-08-26 17:55:48,167 INFO L82 GeneralOperation]: Start removeDead. Operand has 97 places, 100 transitions, 224 flow [2023-08-26 17:55:48,168 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 78 places, 79 transitions, 173 flow [2023-08-26 17:55:48,168 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:55:48,168 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 78 places, 79 transitions, 173 flow [2023-08-26 17:55:48,168 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 78 places, 79 transitions, 173 flow [2023-08-26 17:55:48,168 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 78 places, 79 transitions, 173 flow [2023-08-26 17:55:48,177 INFO L124 PetriNetUnfolderBase]: 11/105 cut-off events. [2023-08-26 17:55:48,177 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:55:48,178 INFO L83 FinitePrefix]: Finished finitePrefix Result has 118 conditions, 105 events. 11/105 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 215 event pairs, 0 based on Foata normal form. 0/84 useless extension candidates. Maximal degree in co-relation 93. Up to 6 conditions per place. [2023-08-26 17:55:48,179 INFO L119 LiptonReduction]: Number of co-enabled transitions 2494 [2023-08-26 17:55:49,264 INFO L134 LiptonReduction]: Checked pairs total: 6906 [2023-08-26 17:55:49,265 INFO L136 LiptonReduction]: Total number of compositions: 56 [2023-08-26 17:55:49,266 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 17:55:49,266 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;@1d1ae1a2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:55:49,266 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-08-26 17:55:49,269 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:55:49,270 INFO L124 PetriNetUnfolderBase]: 4/43 cut-off events. [2023-08-26 17:55:49,270 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:55:49,270 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:49,270 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:49,270 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 17:55:49,270 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:49,270 INFO L85 PathProgramCache]: Analyzing trace with hash -1137394, now seen corresponding path program 1 times [2023-08-26 17:55:49,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:49,270 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989700929] [2023-08-26 17:55:49,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:49,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:49,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:55:49,293 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 17:55:49,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:55:49,306 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 17:55:49,306 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 17:55:49,306 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2023-08-26 17:55:49,306 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 2 remaining) [2023-08-26 17:55:49,306 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-08-26 17:55:49,307 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 17:55:49,307 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE,UNKNOWN (2/2) [2023-08-26 17:55:49,307 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 17:55:49,307 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 17:55:49,332 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:55:49,334 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 126 places, 131 transitions, 304 flow [2023-08-26 17:55:49,343 INFO L124 PetriNetUnfolderBase]: 14/134 cut-off events. [2023-08-26 17:55:49,343 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:55:49,344 INFO L83 FinitePrefix]: Finished finitePrefix Result has 155 conditions, 134 events. 14/134 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 298 event pairs, 0 based on Foata normal form. 0/105 useless extension candidates. Maximal degree in co-relation 148. Up to 8 conditions per place. [2023-08-26 17:55:49,344 INFO L82 GeneralOperation]: Start removeDead. Operand has 126 places, 131 transitions, 304 flow [2023-08-26 17:55:49,345 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 93 places, 94 transitions, 212 flow [2023-08-26 17:55:49,345 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:55:49,345 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 93 places, 94 transitions, 212 flow [2023-08-26 17:55:49,345 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 93 places, 94 transitions, 212 flow [2023-08-26 17:55:49,345 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 93 places, 94 transitions, 212 flow [2023-08-26 17:55:49,355 INFO L124 PetriNetUnfolderBase]: 14/134 cut-off events. [2023-08-26 17:55:49,355 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:55:49,356 INFO L83 FinitePrefix]: Finished finitePrefix Result has 153 conditions, 134 events. 14/134 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 293 event pairs, 0 based on Foata normal form. 0/105 useless extension candidates. Maximal degree in co-relation 125. Up to 8 conditions per place. [2023-08-26 17:55:49,358 INFO L119 LiptonReduction]: Number of co-enabled transitions 3920 [2023-08-26 17:55:50,720 INFO L134 LiptonReduction]: Checked pairs total: 13771 [2023-08-26 17:55:50,721 INFO L136 LiptonReduction]: Total number of compositions: 65 [2023-08-26 17:55:50,722 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:55:50,722 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;@1d1ae1a2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:55:50,722 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-08-26 17:55:50,722 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:55:50,722 INFO L124 PetriNetUnfolderBase]: 0/0 cut-off events. [2023-08-26 17:55:50,722 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:55:50,723 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:50,723 INFO L208 CegarLoopForPetriNet]: trace histogram [1] [2023-08-26 17:55:50,723 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 17:55:50,723 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:50,723 INFO L85 PathProgramCache]: Analyzing trace with hash 905, now seen corresponding path program 1 times [2023-08-26 17:55:50,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:50,723 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136686601] [2023-08-26 17:55:50,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:50,723 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:50,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:50,727 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 17:55:50,727 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:50,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136686601] [2023-08-26 17:55:50,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136686601] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:50,728 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:50,728 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [0] imperfect sequences [] total 0 [2023-08-26 17:55:50,728 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024881469] [2023-08-26 17:55:50,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:50,728 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-26 17:55:50,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:50,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-26 17:55:50,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-26 17:55:50,729 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 90 out of 196 [2023-08-26 17:55:50,729 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 53 places, 49 transitions, 122 flow. Second operand has 2 states, 2 states have (on average 90.5) internal successors, (181), 2 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:50,729 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:50,729 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 90 of 196 [2023-08-26 17:55:50,730 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:51,009 INFO L124 PetriNetUnfolderBase]: 2355/4359 cut-off events. [2023-08-26 17:55:51,009 INFO L125 PetriNetUnfolderBase]: For 404/404 co-relation queries the response was YES. [2023-08-26 17:55:51,022 INFO L83 FinitePrefix]: Finished finitePrefix Result has 7835 conditions, 4359 events. 2355/4359 cut-off events. For 404/404 co-relation queries the response was YES. Maximal size of possible extension queue 251. Compared 31123 event pairs, 1561 based on Foata normal form. 149/3972 useless extension candidates. Maximal degree in co-relation 7823. Up to 3099 conditions per place. [2023-08-26 17:55:51,049 INFO L140 encePairwiseOnDemand]: 187/196 looper letters, 19 selfloop transitions, 0 changer transitions 0/39 dead transitions. [2023-08-26 17:55:51,049 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 46 places, 39 transitions, 140 flow [2023-08-26 17:55:51,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-26 17:55:51,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-26 17:55:51,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 208 transitions. [2023-08-26 17:55:51,050 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5306122448979592 [2023-08-26 17:55:51,050 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 208 transitions. [2023-08-26 17:55:51,050 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 208 transitions. [2023-08-26 17:55:51,051 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:51,051 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 208 transitions. [2023-08-26 17:55:51,051 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 104.0) internal successors, (208), 2 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,052 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 196.0) internal successors, (588), 3 states have internal predecessors, (588), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,052 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 196.0) internal successors, (588), 3 states have internal predecessors, (588), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,052 INFO L175 Difference]: Start difference. First operand has 53 places, 49 transitions, 122 flow. Second operand 2 states and 208 transitions. [2023-08-26 17:55:51,053 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 46 places, 39 transitions, 140 flow [2023-08-26 17:55:51,053 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 39 transitions, 133 flow, removed 3 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:51,054 INFO L231 Difference]: Finished difference. Result has 45 places, 39 transitions, 95 flow [2023-08-26 17:55:51,054 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=196, PETRI_DIFFERENCE_MINUEND_FLOW=95, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=39, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=95, PETRI_PLACES=45, PETRI_TRANSITIONS=39} [2023-08-26 17:55:51,054 INFO L281 CegarLoopForPetriNet]: 53 programPoint places, -8 predicate places. [2023-08-26 17:55:51,055 INFO L495 AbstractCegarLoop]: Abstraction has has 45 places, 39 transitions, 95 flow [2023-08-26 17:55:51,055 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 90.5) internal successors, (181), 2 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,055 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:51,055 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:55:51,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-08-26 17:55:51,055 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 17:55:51,055 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:51,055 INFO L85 PathProgramCache]: Analyzing trace with hash 27791246, now seen corresponding path program 1 times [2023-08-26 17:55:51,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:51,056 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951985165] [2023-08-26 17:55:51,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:51,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:51,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:51,089 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 17:55:51,090 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:51,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951985165] [2023-08-26 17:55:51,090 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951985165] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:51,090 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:51,090 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:55:51,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715813875] [2023-08-26 17:55:51,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:51,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:51,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:51,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:51,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:51,092 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 78 out of 196 [2023-08-26 17:55:51,093 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 45 places, 39 transitions, 95 flow. Second operand has 3 states, 3 states have (on average 79.33333333333333) internal successors, (238), 3 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,093 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:51,093 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 78 of 196 [2023-08-26 17:55:51,093 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:51,312 INFO L124 PetriNetUnfolderBase]: 1707/3251 cut-off events. [2023-08-26 17:55:51,312 INFO L125 PetriNetUnfolderBase]: For 149/149 co-relation queries the response was YES. [2023-08-26 17:55:51,320 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5744 conditions, 3251 events. 1707/3251 cut-off events. For 149/149 co-relation queries the response was YES. Maximal size of possible extension queue 188. Compared 22481 event pairs, 1123 based on Foata normal form. 0/2913 useless extension candidates. Maximal degree in co-relation 5738. Up to 2250 conditions per place. [2023-08-26 17:55:51,336 INFO L140 encePairwiseOnDemand]: 194/196 looper letters, 17 selfloop transitions, 1 changer transitions 0/38 dead transitions. [2023-08-26 17:55:51,336 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 46 places, 38 transitions, 129 flow [2023-08-26 17:55:51,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:55:51,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:55:51,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 253 transitions. [2023-08-26 17:55:51,338 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4302721088435374 [2023-08-26 17:55:51,338 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 253 transitions. [2023-08-26 17:55:51,338 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 253 transitions. [2023-08-26 17:55:51,338 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:51,338 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 253 transitions. [2023-08-26 17:55:51,339 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 84.33333333333333) internal successors, (253), 3 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,340 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 196.0) internal successors, (784), 4 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,340 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 196.0) internal successors, (784), 4 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,340 INFO L175 Difference]: Start difference. First operand has 45 places, 39 transitions, 95 flow. Second operand 3 states and 253 transitions. [2023-08-26 17:55:51,340 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 46 places, 38 transitions, 129 flow [2023-08-26 17:55:51,340 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 46 places, 38 transitions, 129 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 17:55:51,343 INFO L231 Difference]: Finished difference. Result has 46 places, 38 transitions, 95 flow [2023-08-26 17:55:51,343 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=196, PETRI_DIFFERENCE_MINUEND_FLOW=93, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=38, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=37, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=95, PETRI_PLACES=46, PETRI_TRANSITIONS=38} [2023-08-26 17:55:51,343 INFO L281 CegarLoopForPetriNet]: 53 programPoint places, -7 predicate places. [2023-08-26 17:55:51,343 INFO L495 AbstractCegarLoop]: Abstraction has has 46 places, 38 transitions, 95 flow [2023-08-26 17:55:51,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 79.33333333333333) internal successors, (238), 3 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,344 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:51,344 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:55:51,344 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2023-08-26 17:55:51,344 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 17:55:51,344 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:51,345 INFO L85 PathProgramCache]: Analyzing trace with hash 27791247, now seen corresponding path program 1 times [2023-08-26 17:55:51,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:51,346 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670962629] [2023-08-26 17:55:51,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:51,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:51,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:51,364 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 17:55:51,365 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:51,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670962629] [2023-08-26 17:55:51,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [670962629] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:51,365 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:51,365 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:55:51,365 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074670675] [2023-08-26 17:55:51,365 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:51,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:51,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:51,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:51,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:51,368 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 196 [2023-08-26 17:55:51,369 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 46 places, 38 transitions, 95 flow. Second operand has 3 states, 3 states have (on average 78.33333333333333) internal successors, (235), 3 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,369 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:51,369 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 196 [2023-08-26 17:55:51,369 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:51,505 INFO L124 PetriNetUnfolderBase]: 1059/2143 cut-off events. [2023-08-26 17:55:51,505 INFO L125 PetriNetUnfolderBase]: For 149/149 co-relation queries the response was YES. [2023-08-26 17:55:51,511 INFO L83 FinitePrefix]: Finished finitePrefix Result has 3790 conditions, 2143 events. 1059/2143 cut-off events. For 149/149 co-relation queries the response was YES. Maximal size of possible extension queue 125. Compared 14175 event pairs, 685 based on Foata normal form. 0/2003 useless extension candidates. Maximal degree in co-relation 3783. Up to 1402 conditions per place. [2023-08-26 17:55:51,518 INFO L140 encePairwiseOnDemand]: 194/196 looper letters, 15 selfloop transitions, 1 changer transitions 1/37 dead transitions. [2023-08-26 17:55:51,518 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 47 places, 37 transitions, 127 flow [2023-08-26 17:55:51,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:55:51,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:55:51,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 249 transitions. [2023-08-26 17:55:51,519 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42346938775510207 [2023-08-26 17:55:51,519 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 249 transitions. [2023-08-26 17:55:51,519 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 249 transitions. [2023-08-26 17:55:51,520 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:51,520 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 249 transitions. [2023-08-26 17:55:51,520 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 83.0) internal successors, (249), 3 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,521 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 196.0) internal successors, (784), 4 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,521 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 196.0) internal successors, (784), 4 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,522 INFO L175 Difference]: Start difference. First operand has 46 places, 38 transitions, 95 flow. Second operand 3 states and 249 transitions. [2023-08-26 17:55:51,522 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 47 places, 37 transitions, 127 flow [2023-08-26 17:55:51,522 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 46 places, 37 transitions, 126 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:51,523 INFO L231 Difference]: Finished difference. Result has 46 places, 36 transitions, 92 flow [2023-08-26 17:55:51,523 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=196, PETRI_DIFFERENCE_MINUEND_FLOW=92, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=37, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=36, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=92, PETRI_PLACES=46, PETRI_TRANSITIONS=36} [2023-08-26 17:55:51,523 INFO L281 CegarLoopForPetriNet]: 53 programPoint places, -7 predicate places. [2023-08-26 17:55:51,524 INFO L495 AbstractCegarLoop]: Abstraction has has 46 places, 36 transitions, 92 flow [2023-08-26 17:55:51,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 78.33333333333333) internal successors, (235), 3 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,524 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:51,524 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 17:55:51,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2023-08-26 17:55:51,524 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 17:55:51,524 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:51,524 INFO L85 PathProgramCache]: Analyzing trace with hash 861458401, now seen corresponding path program 1 times [2023-08-26 17:55:51,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:51,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1060681123] [2023-08-26 17:55:51,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:51,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:51,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:51,552 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 17:55:51,552 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:51,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1060681123] [2023-08-26 17:55:51,553 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1060681123] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:51,553 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:51,553 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:55:51,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208004102] [2023-08-26 17:55:51,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:51,553 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:51,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:51,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:51,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:51,554 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 73 out of 196 [2023-08-26 17:55:51,554 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 46 places, 36 transitions, 92 flow. Second operand has 3 states, 3 states have (on average 74.33333333333333) internal successors, (223), 3 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:51,554 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:51,555 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 73 of 196 [2023-08-26 17:55:51,555 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:52,565 INFO L124 PetriNetUnfolderBase]: 9707/13472 cut-off events. [2023-08-26 17:55:52,565 INFO L125 PetriNetUnfolderBase]: For 718/718 co-relation queries the response was YES. [2023-08-26 17:55:52,602 INFO L83 FinitePrefix]: Finished finitePrefix Result has 26852 conditions, 13472 events. 9707/13472 cut-off events. For 718/718 co-relation queries the response was YES. Maximal size of possible extension queue 615. Compared 78442 event pairs, 2171 based on Foata normal form. 0/12948 useless extension candidates. Maximal degree in co-relation 26845. Up to 11498 conditions per place. [2023-08-26 17:55:52,665 INFO L140 encePairwiseOnDemand]: 191/196 looper letters, 37 selfloop transitions, 4 changer transitions 0/51 dead transitions. [2023-08-26 17:55:52,666 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 47 places, 51 transitions, 214 flow [2023-08-26 17:55:52,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:55:52,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:55:52,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 261 transitions. [2023-08-26 17:55:52,668 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44387755102040816 [2023-08-26 17:55:52,668 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 261 transitions. [2023-08-26 17:55:52,668 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 261 transitions. [2023-08-26 17:55:52,668 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:52,669 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 261 transitions. [2023-08-26 17:55:52,669 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 87.0) internal successors, (261), 3 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:52,670 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 196.0) internal successors, (784), 4 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:52,670 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 196.0) internal successors, (784), 4 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:52,671 INFO L175 Difference]: Start difference. First operand has 46 places, 36 transitions, 92 flow. Second operand 3 states and 261 transitions. [2023-08-26 17:55:52,671 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 47 places, 51 transitions, 214 flow [2023-08-26 17:55:52,672 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 46 places, 51 transitions, 213 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:52,673 INFO L231 Difference]: Finished difference. Result has 47 places, 39 transitions, 117 flow [2023-08-26 17:55:52,673 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=196, PETRI_DIFFERENCE_MINUEND_FLOW=91, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=36, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=32, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=117, PETRI_PLACES=47, PETRI_TRANSITIONS=39} [2023-08-26 17:55:52,673 INFO L281 CegarLoopForPetriNet]: 53 programPoint places, -6 predicate places. [2023-08-26 17:55:52,673 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 39 transitions, 117 flow [2023-08-26 17:55:52,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 74.33333333333333) internal successors, (223), 3 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:52,678 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:52,678 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:52,678 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-08-26 17:55:52,678 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 17:55:52,678 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:52,678 INFO L85 PathProgramCache]: Analyzing trace with hash -1687071942, now seen corresponding path program 1 times [2023-08-26 17:55:52,679 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:52,679 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1266137293] [2023-08-26 17:55:52,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:52,679 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:52,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:52,746 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 17:55:52,747 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:52,747 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1266137293] [2023-08-26 17:55:52,747 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1266137293] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:52,747 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:52,747 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 17:55:52,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377625328] [2023-08-26 17:55:52,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:52,748 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:52,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:52,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:52,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:52,749 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 89 out of 196 [2023-08-26 17:55:52,749 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 47 places, 39 transitions, 117 flow. Second operand has 3 states, 3 states have (on average 91.66666666666667) internal successors, (275), 3 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:52,749 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:52,749 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 89 of 196 [2023-08-26 17:55:52,750 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:52,821 INFO L124 PetriNetUnfolderBase]: 240/785 cut-off events. [2023-08-26 17:55:52,821 INFO L125 PetriNetUnfolderBase]: For 104/104 co-relation queries the response was YES. [2023-08-26 17:55:52,823 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1459 conditions, 785 events. 240/785 cut-off events. For 104/104 co-relation queries the response was YES. Maximal size of possible extension queue 46. Compared 4877 event pairs, 49 based on Foata normal form. 326/1102 useless extension candidates. Maximal degree in co-relation 1451. Up to 273 conditions per place. [2023-08-26 17:55:52,825 INFO L140 encePairwiseOnDemand]: 188/196 looper letters, 13 selfloop transitions, 8 changer transitions 0/44 dead transitions. [2023-08-26 17:55:52,825 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 44 transitions, 182 flow [2023-08-26 17:55:52,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:55:52,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:55:52,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 292 transitions. [2023-08-26 17:55:52,827 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4965986394557823 [2023-08-26 17:55:52,827 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 292 transitions. [2023-08-26 17:55:52,827 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 292 transitions. [2023-08-26 17:55:52,827 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:52,827 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 292 transitions. [2023-08-26 17:55:52,828 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 97.33333333333333) internal successors, (292), 3 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 17:55:52,829 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 196.0) internal successors, (784), 4 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:52,829 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 196.0) internal successors, (784), 4 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:52,829 INFO L175 Difference]: Start difference. First operand has 47 places, 39 transitions, 117 flow. Second operand 3 states and 292 transitions. [2023-08-26 17:55:52,829 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 44 transitions, 182 flow [2023-08-26 17:55:52,830 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 48 places, 44 transitions, 178 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:52,830 INFO L231 Difference]: Finished difference. Result has 48 places, 39 transitions, 129 flow [2023-08-26 17:55:52,830 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=196, PETRI_DIFFERENCE_MINUEND_FLOW=113, PETRI_DIFFERENCE_MINUEND_PLACES=46, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=39, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=8, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=129, PETRI_PLACES=48, PETRI_TRANSITIONS=39} [2023-08-26 17:55:52,831 INFO L281 CegarLoopForPetriNet]: 53 programPoint places, -5 predicate places. [2023-08-26 17:55:52,831 INFO L495 AbstractCegarLoop]: Abstraction has has 48 places, 39 transitions, 129 flow [2023-08-26 17:55:52,831 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 91.66666666666667) internal successors, (275), 3 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:52,831 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:52,831 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:52,831 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2023-08-26 17:55:52,831 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 17:55:52,832 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:52,832 INFO L85 PathProgramCache]: Analyzing trace with hash 1287604319, now seen corresponding path program 1 times [2023-08-26 17:55:52,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:52,832 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95910549] [2023-08-26 17:55:52,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:52,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:52,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:52,877 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 17:55:52,877 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:52,877 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95910549] [2023-08-26 17:55:52,877 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [95910549] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:52,878 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:52,878 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 17:55:52,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202722712] [2023-08-26 17:55:52,878 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:52,878 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:55:52,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:52,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:55:52,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:55:52,879 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 69 out of 196 [2023-08-26 17:55:52,880 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 39 transitions, 129 flow. Second operand has 5 states, 5 states have (on average 71.6) internal successors, (358), 5 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:52,880 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:52,880 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 69 of 196 [2023-08-26 17:55:52,880 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:53,072 INFO L124 PetriNetUnfolderBase]: 721/1566 cut-off events. [2023-08-26 17:55:53,073 INFO L125 PetriNetUnfolderBase]: For 453/453 co-relation queries the response was YES. [2023-08-26 17:55:53,077 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4088 conditions, 1566 events. 721/1566 cut-off events. For 453/453 co-relation queries the response was YES. Maximal size of possible extension queue 101. Compared 10789 event pairs, 59 based on Foata normal form. 12/1574 useless extension candidates. Maximal degree in co-relation 4080. Up to 914 conditions per place. [2023-08-26 17:55:53,082 INFO L140 encePairwiseOnDemand]: 185/196 looper letters, 61 selfloop transitions, 13 changer transitions 0/81 dead transitions. [2023-08-26 17:55:53,082 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 53 places, 81 transitions, 433 flow [2023-08-26 17:55:53,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 17:55:53,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 17:55:53,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 489 transitions. [2023-08-26 17:55:53,084 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.41581632653061223 [2023-08-26 17:55:53,084 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 489 transitions. [2023-08-26 17:55:53,084 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 489 transitions. [2023-08-26 17:55:53,084 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:53,084 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 489 transitions. [2023-08-26 17:55:53,085 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 81.5) internal successors, (489), 6 states have internal predecessors, (489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:53,087 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 196.0) internal successors, (1372), 7 states have internal predecessors, (1372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:53,087 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 196.0) internal successors, (1372), 7 states have internal predecessors, (1372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:53,087 INFO L175 Difference]: Start difference. First operand has 48 places, 39 transitions, 129 flow. Second operand 6 states and 489 transitions. [2023-08-26 17:55:53,088 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 53 places, 81 transitions, 433 flow [2023-08-26 17:55:53,090 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 52 places, 81 transitions, 412 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:53,091 INFO L231 Difference]: Finished difference. Result has 55 places, 48 transitions, 209 flow [2023-08-26 17:55:53,091 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=196, PETRI_DIFFERENCE_MINUEND_FLOW=121, PETRI_DIFFERENCE_MINUEND_PLACES=47, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=39, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=26, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=209, PETRI_PLACES=55, PETRI_TRANSITIONS=48} [2023-08-26 17:55:53,092 INFO L281 CegarLoopForPetriNet]: 53 programPoint places, 2 predicate places. [2023-08-26 17:55:53,092 INFO L495 AbstractCegarLoop]: Abstraction has has 55 places, 48 transitions, 209 flow [2023-08-26 17:55:53,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 71.6) internal successors, (358), 5 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:53,092 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:53,093 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:53,093 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2023-08-26 17:55:53,093 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 17:55:53,093 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:53,093 INFO L85 PathProgramCache]: Analyzing trace with hash 1882505253, now seen corresponding path program 2 times [2023-08-26 17:55:53,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:53,093 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844340098] [2023-08-26 17:55:53,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:53,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:53,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:53,215 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:53,215 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:53,215 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844340098] [2023-08-26 17:55:53,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844340098] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:55:53,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978476734] [2023-08-26 17:55:53,217 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 17:55:53,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:55:53,218 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:55:53,221 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 17:55:53,247 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 17:55:53,305 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 17:55:53,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 17:55:53,306 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2023-08-26 17:55:53,308 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:55:53,416 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:53,416 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:55:53,515 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:53,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978476734] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:55:53,515 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:55:53,516 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2023-08-26 17:55:53,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8702956] [2023-08-26 17:55:53,516 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:55:53,516 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-08-26 17:55:53,516 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:53,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-08-26 17:55:53,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2023-08-26 17:55:53,518 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 68 out of 196 [2023-08-26 17:55:53,519 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 55 places, 48 transitions, 209 flow. Second operand has 20 states, 20 states have (on average 70.85) internal successors, (1417), 20 states have internal predecessors, (1417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:53,519 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:53,520 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 68 of 196 [2023-08-26 17:55:53,520 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:54,097 INFO L124 PetriNetUnfolderBase]: 1079/2286 cut-off events. [2023-08-26 17:55:54,097 INFO L125 PetriNetUnfolderBase]: For 945/945 co-relation queries the response was YES. [2023-08-26 17:55:54,104 INFO L83 FinitePrefix]: Finished finitePrefix Result has 6254 conditions, 2286 events. 1079/2286 cut-off events. For 945/945 co-relation queries the response was YES. Maximal size of possible extension queue 135. Compared 16764 event pairs, 41 based on Foata normal form. 20/2302 useless extension candidates. Maximal degree in co-relation 6242. Up to 926 conditions per place. [2023-08-26 17:55:54,142 INFO L140 encePairwiseOnDemand]: 182/196 looper letters, 82 selfloop transitions, 28 changer transitions 0/117 dead transitions. [2023-08-26 17:55:54,142 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 117 transitions, 702 flow [2023-08-26 17:55:54,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-08-26 17:55:54,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2023-08-26 17:55:54,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 859 transitions. [2023-08-26 17:55:54,146 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3984230055658627 [2023-08-26 17:55:54,146 INFO L72 ComplementDD]: Start complementDD. Operand 11 states and 859 transitions. [2023-08-26 17:55:54,146 INFO L73 IsDeterministic]: Start isDeterministic. Operand 11 states and 859 transitions. [2023-08-26 17:55:54,146 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:54,146 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 11 states and 859 transitions. [2023-08-26 17:55:54,148 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 12 states, 11 states have (on average 78.0909090909091) internal successors, (859), 11 states have internal predecessors, (859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:54,151 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 12 states, 12 states have (on average 196.0) internal successors, (2352), 12 states have internal predecessors, (2352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:54,151 INFO L81 ComplementDD]: Finished complementDD. Result has 12 states, 12 states have (on average 196.0) internal successors, (2352), 12 states have internal predecessors, (2352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:54,152 INFO L175 Difference]: Start difference. First operand has 55 places, 48 transitions, 209 flow. Second operand 11 states and 859 transitions. [2023-08-26 17:55:54,152 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 117 transitions, 702 flow [2023-08-26 17:55:54,155 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 63 places, 117 transitions, 688 flow, removed 3 selfloop flow, removed 2 redundant places. [2023-08-26 17:55:54,157 INFO L231 Difference]: Finished difference. Result has 68 places, 63 transitions, 365 flow [2023-08-26 17:55:54,157 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=196, PETRI_DIFFERENCE_MINUEND_FLOW=195, PETRI_DIFFERENCE_MINUEND_PLACES=53, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=48, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=13, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=11, PETRI_FLOW=365, PETRI_PLACES=68, PETRI_TRANSITIONS=63} [2023-08-26 17:55:54,157 INFO L281 CegarLoopForPetriNet]: 53 programPoint places, 15 predicate places. [2023-08-26 17:55:54,158 INFO L495 AbstractCegarLoop]: Abstraction has has 68 places, 63 transitions, 365 flow [2023-08-26 17:55:54,158 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 70.85) internal successors, (1417), 20 states have internal predecessors, (1417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:54,158 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:54,158 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:54,165 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 17:55:54,364 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-08-26 17:55:54,365 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 17:55:54,365 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:54,365 INFO L85 PathProgramCache]: Analyzing trace with hash -787692451, now seen corresponding path program 3 times [2023-08-26 17:55:54,365 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:54,365 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525285747] [2023-08-26 17:55:54,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:54,366 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:54,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:54,554 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:54,554 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:54,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525285747] [2023-08-26 17:55:54,554 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [525285747] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:55:54,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289423955] [2023-08-26 17:55:54,554 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-08-26 17:55:54,554 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:55:54,555 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:55:54,556 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 17:55:54,558 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 17:55:54,642 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-08-26 17:55:54,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 17:55:54,644 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 11 conjunts are in the unsatisfiable core [2023-08-26 17:55:54,645 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:55:54,829 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:54,829 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:55:54,962 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:55:54,963 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289423955] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:55:54,963 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:55:54,963 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 25 [2023-08-26 17:55:54,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736931663] [2023-08-26 17:55:54,963 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:55:54,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-08-26 17:55:54,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:54,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-08-26 17:55:54,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2023-08-26 17:55:54,967 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 68 out of 196 [2023-08-26 17:55:54,968 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 68 places, 63 transitions, 365 flow. Second operand has 27 states, 27 states have (on average 70.77777777777777) internal successors, (1911), 27 states have internal predecessors, (1911), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:54,968 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:54,969 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 68 of 196 [2023-08-26 17:55:54,969 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:56,108 INFO L124 PetriNetUnfolderBase]: 1848/3889 cut-off events. [2023-08-26 17:55:56,109 INFO L125 PetriNetUnfolderBase]: For 2945/2945 co-relation queries the response was YES. [2023-08-26 17:55:56,123 INFO L83 FinitePrefix]: Finished finitePrefix Result has 12221 conditions, 3889 events. 1848/3889 cut-off events. For 2945/2945 co-relation queries the response was YES. Maximal size of possible extension queue 156. Compared 29946 event pairs, 41 based on Foata normal form. 66/3951 useless extension candidates. Maximal degree in co-relation 12204. Up to 990 conditions per place. [2023-08-26 17:55:56,126 INFO L140 encePairwiseOnDemand]: 182/196 looper letters, 0 selfloop transitions, 0 changer transitions 146/146 dead transitions. [2023-08-26 17:55:56,126 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 81 places, 146 transitions, 1052 flow [2023-08-26 17:55:56,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-08-26 17:55:56,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2023-08-26 17:55:56,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 1138 transitions. [2023-08-26 17:55:56,129 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3870748299319728 [2023-08-26 17:55:56,129 INFO L72 ComplementDD]: Start complementDD. Operand 15 states and 1138 transitions. [2023-08-26 17:55:56,129 INFO L73 IsDeterministic]: Start isDeterministic. Operand 15 states and 1138 transitions. [2023-08-26 17:55:56,129 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:56,130 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 15 states and 1138 transitions. [2023-08-26 17:55:56,131 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 16 states, 15 states have (on average 75.86666666666666) internal successors, (1138), 15 states have internal predecessors, (1138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:56,135 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 16 states, 16 states have (on average 196.0) internal successors, (3136), 16 states have internal predecessors, (3136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:56,135 INFO L81 ComplementDD]: Finished complementDD. Result has 16 states, 16 states have (on average 196.0) internal successors, (3136), 16 states have internal predecessors, (3136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:56,136 INFO L175 Difference]: Start difference. First operand has 68 places, 63 transitions, 365 flow. Second operand 15 states and 1138 transitions. [2023-08-26 17:55:56,136 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 81 places, 146 transitions, 1052 flow [2023-08-26 17:55:56,147 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 76 places, 146 transitions, 1002 flow, removed 12 selfloop flow, removed 5 redundant places. [2023-08-26 17:55:56,148 INFO L231 Difference]: Finished difference. Result has 76 places, 0 transitions, 0 flow [2023-08-26 17:55:56,148 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=196, PETRI_DIFFERENCE_MINUEND_FLOW=307, PETRI_DIFFERENCE_MINUEND_PLACES=62, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=62, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=62, PETRI_DIFFERENCE_SUBTRAHEND_STATES=15, PETRI_FLOW=0, PETRI_PLACES=76, PETRI_TRANSITIONS=0} [2023-08-26 17:55:56,149 INFO L281 CegarLoopForPetriNet]: 53 programPoint places, 23 predicate places. [2023-08-26 17:55:56,149 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 0 transitions, 0 flow [2023-08-26 17:55:56,149 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 70.77777777777777) internal successors, (1911), 27 states have internal predecessors, (1911), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:56,149 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 8 remaining) [2023-08-26 17:55:56,150 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 8 remaining) [2023-08-26 17:55:56,150 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 8 remaining) [2023-08-26 17:55:56,150 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 8 remaining) [2023-08-26 17:55:56,150 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 8 remaining) [2023-08-26 17:55:56,150 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 8 remaining) [2023-08-26 17:55:56,150 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 8 remaining) [2023-08-26 17:55:56,150 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 8 remaining) [2023-08-26 17:55:56,158 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-08-26 17:55:56,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-08-26 17:55:56,356 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1, 1, 1, 1, 1] [2023-08-26 17:55:56,356 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 17:55:56,358 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 126 places, 131 transitions, 304 flow [2023-08-26 17:55:56,367 INFO L124 PetriNetUnfolderBase]: 14/134 cut-off events. [2023-08-26 17:55:56,367 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:55:56,367 INFO L83 FinitePrefix]: Finished finitePrefix Result has 155 conditions, 134 events. 14/134 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 298 event pairs, 0 based on Foata normal form. 0/105 useless extension candidates. Maximal degree in co-relation 148. Up to 8 conditions per place. [2023-08-26 17:55:56,367 INFO L82 GeneralOperation]: Start removeDead. Operand has 126 places, 131 transitions, 304 flow [2023-08-26 17:55:56,368 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 91 places, 92 transitions, 208 flow [2023-08-26 17:55:56,368 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:55:56,368 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 91 places, 92 transitions, 208 flow [2023-08-26 17:55:56,368 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 91 places, 92 transitions, 208 flow [2023-08-26 17:55:56,368 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 91 places, 92 transitions, 208 flow [2023-08-26 17:55:56,376 INFO L124 PetriNetUnfolderBase]: 14/132 cut-off events. [2023-08-26 17:55:56,376 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:55:56,377 INFO L83 FinitePrefix]: Finished finitePrefix Result has 151 conditions, 132 events. 14/132 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 288 event pairs, 0 based on Foata normal form. 0/105 useless extension candidates. Maximal degree in co-relation 125. Up to 8 conditions per place. [2023-08-26 17:55:56,379 INFO L119 LiptonReduction]: Number of co-enabled transitions 3920 [2023-08-26 17:55:57,393 INFO L134 LiptonReduction]: Checked pairs total: 11989 [2023-08-26 17:55:57,393 INFO L136 LiptonReduction]: Total number of compositions: 61 [2023-08-26 17:55:57,395 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 17:55:57,395 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;@1d1ae1a2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:55:57,395 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-08-26 17:55:57,399 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:55:57,399 INFO L124 PetriNetUnfolderBase]: 5/58 cut-off events. [2023-08-26 17:55:57,399 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:55:57,399 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:57,399 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:55:57,399 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 17:55:57,399 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:57,399 INFO L85 PathProgramCache]: Analyzing trace with hash 1362721543, now seen corresponding path program 1 times [2023-08-26 17:55:57,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:57,400 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358227743] [2023-08-26 17:55:57,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:57,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:57,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:55:57,417 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 17:55:57,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:55:57,431 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 17:55:57,431 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 17:55:57,431 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2023-08-26 17:55:57,431 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 2 remaining) [2023-08-26 17:55:57,431 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2023-08-26 17:55:57,431 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 17:55:57,433 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE,UNKNOWN (2/2) [2023-08-26 17:55:57,433 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 17:55:57,433 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 17:55:57,461 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:55:57,463 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 155 places, 162 transitions, 388 flow [2023-08-26 17:55:57,473 INFO L124 PetriNetUnfolderBase]: 17/161 cut-off events. [2023-08-26 17:55:57,473 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 17:55:57,474 INFO L83 FinitePrefix]: Finished finitePrefix Result has 190 conditions, 161 events. 17/161 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 366 event pairs, 0 based on Foata normal form. 0/126 useless extension candidates. Maximal degree in co-relation 181. Up to 10 conditions per place. [2023-08-26 17:55:57,474 INFO L82 GeneralOperation]: Start removeDead. Operand has 155 places, 162 transitions, 388 flow [2023-08-26 17:55:57,475 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 106 places, 107 transitions, 249 flow [2023-08-26 17:55:57,475 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:55:57,475 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 106 places, 107 transitions, 249 flow [2023-08-26 17:55:57,475 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 106 places, 107 transitions, 249 flow [2023-08-26 17:55:57,475 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 106 places, 107 transitions, 249 flow [2023-08-26 17:55:57,484 INFO L124 PetriNetUnfolderBase]: 17/161 cut-off events. [2023-08-26 17:55:57,485 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 17:55:57,485 INFO L83 FinitePrefix]: Finished finitePrefix Result has 187 conditions, 161 events. 17/161 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 366 event pairs, 0 based on Foata normal form. 0/126 useless extension candidates. Maximal degree in co-relation 158. Up to 10 conditions per place. [2023-08-26 17:55:57,489 INFO L119 LiptonReduction]: Number of co-enabled transitions 5658 [2023-08-26 17:55:58,651 INFO L134 LiptonReduction]: Checked pairs total: 18336 [2023-08-26 17:55:58,651 INFO L136 LiptonReduction]: Total number of compositions: 73 [2023-08-26 17:55:58,652 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:55:58,653 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;@1d1ae1a2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:55:58,653 INFO L358 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2023-08-26 17:55:58,653 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:55:58,653 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 17:55:58,653 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:55:58,653 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:58,653 INFO L208 CegarLoopForPetriNet]: trace histogram [1] [2023-08-26 17:55:58,653 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 17:55:58,654 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:58,654 INFO L85 PathProgramCache]: Analyzing trace with hash 1234, now seen corresponding path program 1 times [2023-08-26 17:55:58,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:58,654 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [948057901] [2023-08-26 17:55:58,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:58,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:58,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:58,658 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 17:55:58,658 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:58,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [948057901] [2023-08-26 17:55:58,658 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [948057901] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:58,658 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:58,658 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [0] imperfect sequences [] total 0 [2023-08-26 17:55:58,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154792539] [2023-08-26 17:55:58,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:58,658 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-26 17:55:58,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:58,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-26 17:55:58,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-26 17:55:58,659 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 108 out of 235 [2023-08-26 17:55:58,660 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 58 transitions, 151 flow. Second operand has 2 states, 2 states have (on average 108.5) internal successors, (217), 2 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:58,660 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:58,660 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 108 of 235 [2023-08-26 17:55:58,660 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:55:59,661 INFO L124 PetriNetUnfolderBase]: 9234/15390 cut-off events. [2023-08-26 17:55:59,661 INFO L125 PetriNetUnfolderBase]: For 2245/2245 co-relation queries the response was YES. [2023-08-26 17:55:59,688 INFO L83 FinitePrefix]: Finished finitePrefix Result has 28309 conditions, 15390 events. 9234/15390 cut-off events. For 2245/2245 co-relation queries the response was YES. Maximal size of possible extension queue 741. Compared 118572 event pairs, 6118 based on Foata normal form. 445/14246 useless extension candidates. Maximal degree in co-relation 28296. Up to 11461 conditions per place. [2023-08-26 17:55:59,750 INFO L140 encePairwiseOnDemand]: 225/235 looper letters, 22 selfloop transitions, 0 changer transitions 0/47 dead transitions. [2023-08-26 17:55:59,751 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 47 transitions, 173 flow [2023-08-26 17:55:59,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-26 17:55:59,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-26 17:55:59,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 248 transitions. [2023-08-26 17:55:59,752 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5276595744680851 [2023-08-26 17:55:59,752 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 248 transitions. [2023-08-26 17:55:59,752 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 248 transitions. [2023-08-26 17:55:59,756 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:55:59,756 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 248 transitions. [2023-08-26 17:55:59,758 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 124.0) internal successors, (248), 2 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:59,759 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 235.0) internal successors, (705), 3 states have internal predecessors, (705), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:59,760 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 235.0) internal successors, (705), 3 states have internal predecessors, (705), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:59,760 INFO L175 Difference]: Start difference. First operand has 63 places, 58 transitions, 151 flow. Second operand 2 states and 248 transitions. [2023-08-26 17:55:59,760 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 47 transitions, 173 flow [2023-08-26 17:55:59,762 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 47 transitions, 160 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-08-26 17:55:59,763 INFO L231 Difference]: Finished difference. Result has 54 places, 47 transitions, 116 flow [2023-08-26 17:55:59,763 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=235, PETRI_DIFFERENCE_MINUEND_FLOW=116, PETRI_DIFFERENCE_MINUEND_PLACES=53, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=47, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=47, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=116, PETRI_PLACES=54, PETRI_TRANSITIONS=47} [2023-08-26 17:55:59,763 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, -9 predicate places. [2023-08-26 17:55:59,763 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 47 transitions, 116 flow [2023-08-26 17:55:59,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 108.5) internal successors, (217), 2 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:55:59,764 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:55:59,764 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:55:59,764 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2023-08-26 17:55:59,764 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 17:55:59,764 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:55:59,764 INFO L85 PathProgramCache]: Analyzing trace with hash 37818018, now seen corresponding path program 1 times [2023-08-26 17:55:59,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:55:59,764 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142864327] [2023-08-26 17:55:59,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:55:59,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:55:59,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:55:59,788 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 17:55:59,788 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:55:59,789 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142864327] [2023-08-26 17:55:59,789 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142864327] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:55:59,789 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:55:59,789 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:55:59,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647074410] [2023-08-26 17:55:59,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:55:59,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:55:59,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:55:59,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:55:59,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:55:59,790 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 95 out of 235 [2023-08-26 17:55:59,790 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 47 transitions, 116 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 17:55:59,790 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:55:59,790 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 95 of 235 [2023-08-26 17:55:59,791 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:56:00,496 INFO L124 PetriNetUnfolderBase]: 6698/11449 cut-off events. [2023-08-26 17:56:00,496 INFO L125 PetriNetUnfolderBase]: For 460/460 co-relation queries the response was YES. [2023-08-26 17:56:00,522 INFO L83 FinitePrefix]: Finished finitePrefix Result has 20507 conditions, 11449 events. 6698/11449 cut-off events. For 460/460 co-relation queries the response was YES. Maximal size of possible extension queue 554. Compared 86251 event pairs, 4413 based on Foata normal form. 0/10452 useless extension candidates. Maximal degree in co-relation 20500. Up to 8319 conditions per place. [2023-08-26 17:56:00,569 INFO L140 encePairwiseOnDemand]: 233/235 looper letters, 20 selfloop transitions, 1 changer transitions 0/46 dead transitions. [2023-08-26 17:56:00,570 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 46 transitions, 156 flow [2023-08-26 17:56:00,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:56:00,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:56:00,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 307 transitions. [2023-08-26 17:56:00,571 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43546099290780144 [2023-08-26 17:56:00,571 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 307 transitions. [2023-08-26 17:56:00,571 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 307 transitions. [2023-08-26 17:56:00,571 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:56:00,571 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 307 transitions. [2023-08-26 17:56:00,573 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 102.33333333333333) internal successors, (307), 3 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 17:56:00,574 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 235.0) internal successors, (940), 4 states have internal predecessors, (940), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:00,574 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 235.0) internal successors, (940), 4 states have internal predecessors, (940), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:00,574 INFO L175 Difference]: Start difference. First operand has 54 places, 47 transitions, 116 flow. Second operand 3 states and 307 transitions. [2023-08-26 17:56:00,574 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 46 transitions, 156 flow [2023-08-26 17:56:00,575 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 55 places, 46 transitions, 156 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 17:56:00,576 INFO L231 Difference]: Finished difference. Result has 55 places, 46 transitions, 116 flow [2023-08-26 17:56:00,576 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=235, PETRI_DIFFERENCE_MINUEND_FLOW=114, PETRI_DIFFERENCE_MINUEND_PLACES=53, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=46, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=45, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=116, PETRI_PLACES=55, PETRI_TRANSITIONS=46} [2023-08-26 17:56:00,576 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, -8 predicate places. [2023-08-26 17:56:00,577 INFO L495 AbstractCegarLoop]: Abstraction has has 55 places, 46 transitions, 116 flow [2023-08-26 17:56:00,577 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 17:56:00,577 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:56:00,577 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:56:00,577 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2023-08-26 17:56:00,577 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 17:56:00,579 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:56:00,579 INFO L85 PathProgramCache]: Analyzing trace with hash 37818020, now seen corresponding path program 1 times [2023-08-26 17:56:00,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:56:00,580 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236906266] [2023-08-26 17:56:00,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:56:00,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:56:00,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:56:00,604 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 17:56:00,604 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:56:00,604 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236906266] [2023-08-26 17:56:00,604 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236906266] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:56:00,604 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:56:00,604 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:56:00,605 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662651395] [2023-08-26 17:56:00,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:56:00,606 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:56:00,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:56:00,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:56:00,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:56:00,607 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 96 out of 235 [2023-08-26 17:56:00,607 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 55 places, 46 transitions, 116 flow. Second operand has 3 states, 3 states have (on average 97.33333333333333) internal successors, (292), 3 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 17:56:00,607 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:56:00,607 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 96 of 235 [2023-08-26 17:56:00,607 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:56:01,169 INFO L124 PetriNetUnfolderBase]: 4162/7508 cut-off events. [2023-08-26 17:56:01,169 INFO L125 PetriNetUnfolderBase]: For 460/460 co-relation queries the response was YES. [2023-08-26 17:56:01,189 INFO L83 FinitePrefix]: Finished finitePrefix Result has 13427 conditions, 7508 events. 4162/7508 cut-off events. For 460/460 co-relation queries the response was YES. Maximal size of possible extension queue 369. Compared 55780 event pairs, 2708 based on Foata normal form. 0/7103 useless extension candidates. Maximal degree in co-relation 13419. Up to 5178 conditions per place. [2023-08-26 17:56:01,214 INFO L140 encePairwiseOnDemand]: 233/235 looper letters, 18 selfloop transitions, 1 changer transitions 1/45 dead transitions. [2023-08-26 17:56:01,214 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 56 places, 45 transitions, 154 flow [2023-08-26 17:56:01,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:56:01,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:56:01,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 309 transitions. [2023-08-26 17:56:01,216 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43829787234042555 [2023-08-26 17:56:01,216 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 309 transitions. [2023-08-26 17:56:01,216 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 309 transitions. [2023-08-26 17:56:01,216 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:56:01,216 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 309 transitions. [2023-08-26 17:56:01,217 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 103.0) internal successors, (309), 3 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:01,218 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 235.0) internal successors, (940), 4 states have internal predecessors, (940), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:01,218 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 235.0) internal successors, (940), 4 states have internal predecessors, (940), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:01,218 INFO L175 Difference]: Start difference. First operand has 55 places, 46 transitions, 116 flow. Second operand 3 states and 309 transitions. [2023-08-26 17:56:01,218 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 56 places, 45 transitions, 154 flow [2023-08-26 17:56:01,219 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 55 places, 45 transitions, 153 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:56:01,220 INFO L231 Difference]: Finished difference. Result has 55 places, 44 transitions, 113 flow [2023-08-26 17:56:01,220 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=235, PETRI_DIFFERENCE_MINUEND_FLOW=113, PETRI_DIFFERENCE_MINUEND_PLACES=53, 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=113, PETRI_PLACES=55, PETRI_TRANSITIONS=44} [2023-08-26 17:56:01,220 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, -8 predicate places. [2023-08-26 17:56:01,220 INFO L495 AbstractCegarLoop]: Abstraction has has 55 places, 44 transitions, 113 flow [2023-08-26 17:56:01,220 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 97.33333333333333) internal successors, (292), 3 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 17:56:01,221 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:56:01,221 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 17:56:01,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2023-08-26 17:56:01,221 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 17:56:01,221 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:56:01,221 INFO L85 PathProgramCache]: Analyzing trace with hash 1172285063, now seen corresponding path program 1 times [2023-08-26 17:56:01,221 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:56:01,221 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163325455] [2023-08-26 17:56:01,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:56:01,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:56:01,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:56:01,244 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 17:56:01,244 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:56:01,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163325455] [2023-08-26 17:56:01,244 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163325455] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:56:01,244 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:56:01,244 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:56:01,244 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131759454] [2023-08-26 17:56:01,245 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:56:01,245 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:56:01,245 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:56:01,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:56:01,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:56:01,246 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 86 out of 235 [2023-08-26 17:56:01,246 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 55 places, 44 transitions, 113 flow. Second operand has 3 states, 3 states have (on average 87.33333333333333) internal successors, (262), 3 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:01,246 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:56:01,246 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 86 of 235 [2023-08-26 17:56:01,246 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:56:06,420 INFO L124 PetriNetUnfolderBase]: 72081/93839 cut-off events. [2023-08-26 17:56:06,420 INFO L125 PetriNetUnfolderBase]: For 4193/4193 co-relation queries the response was YES. [2023-08-26 17:56:06,671 INFO L83 FinitePrefix]: Finished finitePrefix Result has 186813 conditions, 93839 events. 72081/93839 cut-off events. For 4193/4193 co-relation queries the response was YES. Maximal size of possible extension queue 3218. Compared 584136 event pairs, 17343 based on Foata normal form. 0/90662 useless extension candidates. Maximal degree in co-relation 186805. Up to 84662 conditions per place. [2023-08-26 17:56:07,098 INFO L140 encePairwiseOnDemand]: 229/235 looper letters, 46 selfloop transitions, 5 changer transitions 0/63 dead transitions. [2023-08-26 17:56:07,098 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 56 places, 63 transitions, 268 flow [2023-08-26 17:56:07,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:56:07,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:56:07,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 310 transitions. [2023-08-26 17:56:07,099 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4397163120567376 [2023-08-26 17:56:07,099 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 310 transitions. [2023-08-26 17:56:07,099 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 310 transitions. [2023-08-26 17:56:07,099 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:56:07,099 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 310 transitions. [2023-08-26 17:56:07,100 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 103.33333333333333) internal successors, (310), 3 states have internal predecessors, (310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,101 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 235.0) internal successors, (940), 4 states have internal predecessors, (940), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,101 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 235.0) internal successors, (940), 4 states have internal predecessors, (940), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,101 INFO L175 Difference]: Start difference. First operand has 55 places, 44 transitions, 113 flow. Second operand 3 states and 310 transitions. [2023-08-26 17:56:07,101 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 56 places, 63 transitions, 268 flow [2023-08-26 17:56:07,104 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 55 places, 63 transitions, 267 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:56:07,104 INFO L231 Difference]: Finished difference. Result has 56 places, 48 transitions, 145 flow [2023-08-26 17:56:07,105 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=235, PETRI_DIFFERENCE_MINUEND_FLOW=112, PETRI_DIFFERENCE_MINUEND_PLACES=53, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=44, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=145, PETRI_PLACES=56, PETRI_TRANSITIONS=48} [2023-08-26 17:56:07,105 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, -7 predicate places. [2023-08-26 17:56:07,105 INFO L495 AbstractCegarLoop]: Abstraction has has 56 places, 48 transitions, 145 flow [2023-08-26 17:56:07,105 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 87.33333333333333) internal successors, (262), 3 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,105 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:56:07,105 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:56:07,106 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2023-08-26 17:56:07,106 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 17:56:07,106 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:56:07,106 INFO L85 PathProgramCache]: Analyzing trace with hash -1523412977, now seen corresponding path program 1 times [2023-08-26 17:56:07,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:56:07,106 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81436162] [2023-08-26 17:56:07,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:56:07,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:56:07,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:56:07,139 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 17:56:07,139 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:56:07,139 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81436162] [2023-08-26 17:56:07,139 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81436162] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:56:07,139 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:56:07,139 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 17:56:07,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260190949] [2023-08-26 17:56:07,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:56:07,140 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:56:07,140 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:56:07,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:56:07,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:56:07,140 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 107 out of 235 [2023-08-26 17:56:07,141 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 56 places, 48 transitions, 145 flow. Second operand has 3 states, 3 states have (on average 109.66666666666667) internal successors, (329), 3 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,141 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:56:07,141 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 107 of 235 [2023-08-26 17:56:07,141 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:56:07,256 INFO L124 PetriNetUnfolderBase]: 590/1896 cut-off events. [2023-08-26 17:56:07,256 INFO L125 PetriNetUnfolderBase]: For 270/270 co-relation queries the response was YES. [2023-08-26 17:56:07,260 INFO L83 FinitePrefix]: Finished finitePrefix Result has 3485 conditions, 1896 events. 590/1896 cut-off events. For 270/270 co-relation queries the response was YES. Maximal size of possible extension queue 91. Compared 14215 event pairs, 118 based on Foata normal form. 1022/2901 useless extension candidates. Maximal degree in co-relation 3476. Up to 662 conditions per place. [2023-08-26 17:56:07,263 INFO L140 encePairwiseOnDemand]: 225/235 looper letters, 15 selfloop transitions, 10 changer transitions 0/54 dead transitions. [2023-08-26 17:56:07,263 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 54 transitions, 225 flow [2023-08-26 17:56:07,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:56:07,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:56:07,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 351 transitions. [2023-08-26 17:56:07,264 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4978723404255319 [2023-08-26 17:56:07,264 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 351 transitions. [2023-08-26 17:56:07,264 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 351 transitions. [2023-08-26 17:56:07,265 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:56:07,265 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 351 transitions. [2023-08-26 17:56:07,265 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 117.0) internal successors, (351), 3 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,266 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 235.0) internal successors, (940), 4 states have internal predecessors, (940), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,266 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 235.0) internal successors, (940), 4 states have internal predecessors, (940), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,266 INFO L175 Difference]: Start difference. First operand has 56 places, 48 transitions, 145 flow. Second operand 3 states and 351 transitions. [2023-08-26 17:56:07,267 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 54 transitions, 225 flow [2023-08-26 17:56:07,268 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 57 places, 54 transitions, 220 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:56:07,268 INFO L231 Difference]: Finished difference. Result has 57 places, 48 transitions, 160 flow [2023-08-26 17:56:07,268 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=235, PETRI_DIFFERENCE_MINUEND_FLOW=140, PETRI_DIFFERENCE_MINUEND_PLACES=55, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=48, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=38, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=160, PETRI_PLACES=57, PETRI_TRANSITIONS=48} [2023-08-26 17:56:07,269 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, -6 predicate places. [2023-08-26 17:56:07,269 INFO L495 AbstractCegarLoop]: Abstraction has has 57 places, 48 transitions, 160 flow [2023-08-26 17:56:07,269 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 109.66666666666667) internal successors, (329), 3 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,269 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:56:07,269 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:56:07,269 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2023-08-26 17:56:07,269 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 17:56:07,270 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:56:07,270 INFO L85 PathProgramCache]: Analyzing trace with hash -2131491382, now seen corresponding path program 1 times [2023-08-26 17:56:07,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:56:07,270 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256956125] [2023-08-26 17:56:07,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:56:07,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:56:07,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:56:07,303 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 17:56:07,303 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:56:07,303 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256956125] [2023-08-26 17:56:07,303 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256956125] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:56:07,303 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:56:07,304 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 17:56:07,304 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334493257] [2023-08-26 17:56:07,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:56:07,304 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:56:07,304 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:56:07,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:56:07,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:56:07,305 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 81 out of 235 [2023-08-26 17:56:07,306 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 57 places, 48 transitions, 160 flow. Second operand has 5 states, 5 states have (on average 83.6) internal successors, (418), 5 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,306 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:56:07,306 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 81 of 235 [2023-08-26 17:56:07,306 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:56:07,585 INFO L124 PetriNetUnfolderBase]: 1797/3735 cut-off events. [2023-08-26 17:56:07,585 INFO L125 PetriNetUnfolderBase]: For 1175/1176 co-relation queries the response was YES. [2023-08-26 17:56:07,591 INFO L83 FinitePrefix]: Finished finitePrefix Result has 9909 conditions, 3735 events. 1797/3735 cut-off events. For 1175/1176 co-relation queries the response was YES. Maximal size of possible extension queue 211. Compared 29225 event pairs, 97 based on Foata normal form. 20/3753 useless extension candidates. Maximal degree in co-relation 9900. Up to 2558 conditions per place. [2023-08-26 17:56:07,599 INFO L140 encePairwiseOnDemand]: 221/235 looper letters, 77 selfloop transitions, 17 changer transitions 0/102 dead transitions. [2023-08-26 17:56:07,599 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 62 places, 102 transitions, 556 flow [2023-08-26 17:56:07,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 17:56:07,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 17:56:07,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 581 transitions. [2023-08-26 17:56:07,601 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.41205673758865247 [2023-08-26 17:56:07,601 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 581 transitions. [2023-08-26 17:56:07,601 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 581 transitions. [2023-08-26 17:56:07,601 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:56:07,601 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 581 transitions. [2023-08-26 17:56:07,602 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 96.83333333333333) internal successors, (581), 6 states have internal predecessors, (581), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,603 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 235.0) internal successors, (1645), 7 states have internal predecessors, (1645), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,604 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 235.0) internal successors, (1645), 7 states have internal predecessors, (1645), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,604 INFO L175 Difference]: Start difference. First operand has 57 places, 48 transitions, 160 flow. Second operand 6 states and 581 transitions. [2023-08-26 17:56:07,604 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 62 places, 102 transitions, 556 flow [2023-08-26 17:56:07,608 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 102 transitions, 530 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:56:07,609 INFO L231 Difference]: Finished difference. Result has 64 places, 60 transitions, 266 flow [2023-08-26 17:56:07,609 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=235, PETRI_DIFFERENCE_MINUEND_FLOW=150, PETRI_DIFFERENCE_MINUEND_PLACES=56, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=48, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=266, PETRI_PLACES=64, PETRI_TRANSITIONS=60} [2023-08-26 17:56:07,609 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, 1 predicate places. [2023-08-26 17:56:07,609 INFO L495 AbstractCegarLoop]: Abstraction has has 64 places, 60 transitions, 266 flow [2023-08-26 17:56:07,610 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 83.6) internal successors, (418), 5 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:07,610 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:56:07,610 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:56:07,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2023-08-26 17:56:07,610 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 17:56:07,610 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:56:07,610 INFO L85 PathProgramCache]: Analyzing trace with hash 1669650346, now seen corresponding path program 2 times [2023-08-26 17:56:07,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:56:07,611 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371170875] [2023-08-26 17:56:07,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:56:07,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:56:07,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:56:07,693 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:56:07,693 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:56:07,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371170875] [2023-08-26 17:56:07,694 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [371170875] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:56:07,694 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [607941996] [2023-08-26 17:56:07,694 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 17:56:07,694 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:56:07,694 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:56:07,697 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 17:56:07,726 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 17:56:07,794 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 17:56:07,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 17:56:07,795 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2023-08-26 17:56:07,796 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:56:07,994 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:56:07,994 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:56:08,077 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:56:08,078 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [607941996] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:56:08,078 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:56:08,078 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2023-08-26 17:56:08,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324912493] [2023-08-26 17:56:08,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:56:08,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-08-26 17:56:08,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:56:08,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-08-26 17:56:08,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2023-08-26 17:56:08,080 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 80 out of 235 [2023-08-26 17:56:08,081 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 60 transitions, 266 flow. Second operand has 20 states, 20 states have (on average 82.85) internal successors, (1657), 20 states have internal predecessors, (1657), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:08,082 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:56:08,082 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 80 of 235 [2023-08-26 17:56:08,082 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:56:08,919 INFO L124 PetriNetUnfolderBase]: 2689/5465 cut-off events. [2023-08-26 17:56:08,919 INFO L125 PetriNetUnfolderBase]: For 2439/2440 co-relation queries the response was YES. [2023-08-26 17:56:08,933 INFO L83 FinitePrefix]: Finished finitePrefix Result has 15149 conditions, 5465 events. 2689/5465 cut-off events. For 2439/2440 co-relation queries the response was YES. Maximal size of possible extension queue 305. Compared 45739 event pairs, 61 based on Foata normal form. 40/5503 useless extension candidates. Maximal degree in co-relation 15136. Up to 2618 conditions per place. [2023-08-26 17:56:08,949 INFO L140 encePairwiseOnDemand]: 217/235 looper letters, 104 selfloop transitions, 37 changer transitions 0/149 dead transitions. [2023-08-26 17:56:08,949 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 149 transitions, 919 flow [2023-08-26 17:56:08,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-08-26 17:56:08,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2023-08-26 17:56:08,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 1022 transitions. [2023-08-26 17:56:08,951 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.395357833655706 [2023-08-26 17:56:08,951 INFO L72 ComplementDD]: Start complementDD. Operand 11 states and 1022 transitions. [2023-08-26 17:56:08,951 INFO L73 IsDeterministic]: Start isDeterministic. Operand 11 states and 1022 transitions. [2023-08-26 17:56:08,951 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:56:08,951 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 11 states and 1022 transitions. [2023-08-26 17:56:08,953 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 12 states, 11 states have (on average 92.9090909090909) internal successors, (1022), 11 states have internal predecessors, (1022), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:08,955 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 12 states, 12 states have (on average 235.0) internal successors, (2820), 12 states have internal predecessors, (2820), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:08,956 INFO L81 ComplementDD]: Finished complementDD. Result has 12 states, 12 states have (on average 235.0) internal successors, (2820), 12 states have internal predecessors, (2820), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:08,956 INFO L175 Difference]: Start difference. First operand has 64 places, 60 transitions, 266 flow. Second operand 11 states and 1022 transitions. [2023-08-26 17:56:08,956 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 149 transitions, 919 flow [2023-08-26 17:56:08,966 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 72 places, 149 transitions, 901 flow, removed 4 selfloop flow, removed 2 redundant places. [2023-08-26 17:56:08,968 INFO L231 Difference]: Finished difference. Result has 77 places, 80 transitions, 473 flow [2023-08-26 17:56:08,968 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=235, PETRI_DIFFERENCE_MINUEND_FLOW=248, PETRI_DIFFERENCE_MINUEND_PLACES=62, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=60, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=17, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=11, PETRI_FLOW=473, PETRI_PLACES=77, PETRI_TRANSITIONS=80} [2023-08-26 17:56:08,969 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, 14 predicate places. [2023-08-26 17:56:08,969 INFO L495 AbstractCegarLoop]: Abstraction has has 77 places, 80 transitions, 473 flow [2023-08-26 17:56:08,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 82.85) internal successors, (1657), 20 states have internal predecessors, (1657), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:08,969 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:56:08,969 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:56:08,981 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 17:56:09,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:56:09,175 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 17:56:09,175 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:56:09,175 INFO L85 PathProgramCache]: Analyzing trace with hash 2044254510, now seen corresponding path program 3 times [2023-08-26 17:56:09,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:56:09,176 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31060667] [2023-08-26 17:56:09,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:56:09,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:56:09,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:56:09,319 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:56:09,319 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:56:09,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31060667] [2023-08-26 17:56:09,320 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31060667] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:56:09,320 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924536962] [2023-08-26 17:56:09,320 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-08-26 17:56:09,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:56:09,320 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:56:09,321 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 17:56:09,323 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 17:56:09,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-08-26 17:56:09,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 17:56:09,416 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 11 conjunts are in the unsatisfiable core [2023-08-26 17:56:09,427 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:56:09,597 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:56:09,597 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:56:09,729 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:56:09,729 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1924536962] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:56:09,729 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:56:09,729 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 25 [2023-08-26 17:56:09,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017366578] [2023-08-26 17:56:09,729 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:56:09,729 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-08-26 17:56:09,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:56:09,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-08-26 17:56:09,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2023-08-26 17:56:09,731 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 80 out of 235 [2023-08-26 17:56:09,733 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 77 places, 80 transitions, 473 flow. Second operand has 27 states, 27 states have (on average 82.77777777777777) internal successors, (2235), 27 states have internal predecessors, (2235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:09,733 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:56:09,733 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 80 of 235 [2023-08-26 17:56:09,733 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:56:11,388 INFO L124 PetriNetUnfolderBase]: 4972/10072 cut-off events. [2023-08-26 17:56:11,388 INFO L125 PetriNetUnfolderBase]: For 8162/8163 co-relation queries the response was YES. [2023-08-26 17:56:11,419 INFO L83 FinitePrefix]: Finished finitePrefix Result has 32039 conditions, 10072 events. 4972/10072 cut-off events. For 8162/8163 co-relation queries the response was YES. Maximal size of possible extension queue 402. Compared 90144 event pairs, 61 based on Foata normal form. 156/10226 useless extension candidates. Maximal degree in co-relation 32021. Up to 2502 conditions per place. [2023-08-26 17:56:11,426 INFO L140 encePairwiseOnDemand]: 217/235 looper letters, 0 selfloop transitions, 0 changer transitions 188/188 dead transitions. [2023-08-26 17:56:11,426 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 90 places, 188 transitions, 1393 flow [2023-08-26 17:56:11,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-08-26 17:56:11,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2023-08-26 17:56:11,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 1351 transitions. [2023-08-26 17:56:11,428 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3832624113475177 [2023-08-26 17:56:11,429 INFO L72 ComplementDD]: Start complementDD. Operand 15 states and 1351 transitions. [2023-08-26 17:56:11,429 INFO L73 IsDeterministic]: Start isDeterministic. Operand 15 states and 1351 transitions. [2023-08-26 17:56:11,429 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:56:11,429 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 15 states and 1351 transitions. [2023-08-26 17:56:11,431 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 16 states, 15 states have (on average 90.06666666666666) internal successors, (1351), 15 states have internal predecessors, (1351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:11,435 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 16 states, 16 states have (on average 235.0) internal successors, (3760), 16 states have internal predecessors, (3760), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:11,435 INFO L81 ComplementDD]: Finished complementDD. Result has 16 states, 16 states have (on average 235.0) internal successors, (3760), 16 states have internal predecessors, (3760), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:11,435 INFO L175 Difference]: Start difference. First operand has 77 places, 80 transitions, 473 flow. Second operand 15 states and 1351 transitions. [2023-08-26 17:56:11,435 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 90 places, 188 transitions, 1393 flow [2023-08-26 17:56:11,472 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 85 places, 188 transitions, 1327 flow, removed 16 selfloop flow, removed 5 redundant places. [2023-08-26 17:56:11,473 INFO L231 Difference]: Finished difference. Result has 85 places, 0 transitions, 0 flow [2023-08-26 17:56:11,474 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=235, PETRI_DIFFERENCE_MINUEND_FLOW=399, PETRI_DIFFERENCE_MINUEND_PLACES=71, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=79, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=79, PETRI_DIFFERENCE_SUBTRAHEND_STATES=15, PETRI_FLOW=0, PETRI_PLACES=85, PETRI_TRANSITIONS=0} [2023-08-26 17:56:11,474 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, 22 predicate places. [2023-08-26 17:56:11,474 INFO L495 AbstractCegarLoop]: Abstraction has has 85 places, 0 transitions, 0 flow [2023-08-26 17:56:11,475 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 82.77777777777777) internal successors, (2235), 27 states have internal predecessors, (2235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:11,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 9 remaining) [2023-08-26 17:56:11,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 9 remaining) [2023-08-26 17:56:11,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (6 of 9 remaining) [2023-08-26 17:56:11,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 9 remaining) [2023-08-26 17:56:11,475 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 9 remaining) [2023-08-26 17:56:11,476 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 9 remaining) [2023-08-26 17:56:11,476 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 9 remaining) [2023-08-26 17:56:11,476 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 9 remaining) [2023-08-26 17:56:11,476 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 9 remaining) [2023-08-26 17:56:11,484 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 17:56:11,681 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,SelfDestructingSolverStorable34 [2023-08-26 17:56:11,681 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1, 1, 1, 1, 1] [2023-08-26 17:56:11,682 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 17:56:11,683 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 155 places, 162 transitions, 388 flow [2023-08-26 17:56:11,691 INFO L124 PetriNetUnfolderBase]: 17/161 cut-off events. [2023-08-26 17:56:11,691 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 17:56:11,692 INFO L83 FinitePrefix]: Finished finitePrefix Result has 190 conditions, 161 events. 17/161 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 366 event pairs, 0 based on Foata normal form. 0/126 useless extension candidates. Maximal degree in co-relation 181. Up to 10 conditions per place. [2023-08-26 17:56:11,692 INFO L82 GeneralOperation]: Start removeDead. Operand has 155 places, 162 transitions, 388 flow [2023-08-26 17:56:11,692 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 104 places, 105 transitions, 245 flow [2023-08-26 17:56:11,693 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:56:11,693 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 104 places, 105 transitions, 245 flow [2023-08-26 17:56:11,693 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 104 places, 105 transitions, 245 flow [2023-08-26 17:56:11,693 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 104 places, 105 transitions, 245 flow [2023-08-26 17:56:11,702 INFO L124 PetriNetUnfolderBase]: 17/159 cut-off events. [2023-08-26 17:56:11,703 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 17:56:11,703 INFO L83 FinitePrefix]: Finished finitePrefix Result has 185 conditions, 159 events. 17/159 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 363 event pairs, 0 based on Foata normal form. 0/126 useless extension candidates. Maximal degree in co-relation 158. Up to 10 conditions per place. [2023-08-26 17:56:11,707 INFO L119 LiptonReduction]: Number of co-enabled transitions 5658 [2023-08-26 17:56:12,924 INFO L134 LiptonReduction]: Checked pairs total: 20711 [2023-08-26 17:56:12,924 INFO L136 LiptonReduction]: Total number of compositions: 66 [2023-08-26 17:56:12,925 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 17:56:12,926 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;@1d1ae1a2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:56:12,926 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-08-26 17:56:12,929 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:56:12,929 INFO L124 PetriNetUnfolderBase]: 6/73 cut-off events. [2023-08-26 17:56:12,929 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 17:56:12,930 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:56:12,930 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:56:12,930 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 17:56:12,930 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:56:12,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1231980756, now seen corresponding path program 1 times [2023-08-26 17:56:12,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:56:12,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182576736] [2023-08-26 17:56:12,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:56:12,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:56:12,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:56:12,944 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 17:56:12,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:56:12,952 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 17:56:12,952 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 17:56:12,953 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2023-08-26 17:56:12,953 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 2 remaining) [2023-08-26 17:56:12,953 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2023-08-26 17:56:12,953 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 17:56:12,953 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE,UNKNOWN (2/2) [2023-08-26 17:56:12,953 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 17:56:12,954 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-26 17:56:12,975 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:56:12,977 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 184 places, 193 transitions, 476 flow [2023-08-26 17:56:12,986 INFO L124 PetriNetUnfolderBase]: 20/188 cut-off events. [2023-08-26 17:56:12,986 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 17:56:12,987 INFO L83 FinitePrefix]: Finished finitePrefix Result has 226 conditions, 188 events. 20/188 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 440 event pairs, 0 based on Foata normal form. 0/147 useless extension candidates. Maximal degree in co-relation 215. Up to 12 conditions per place. [2023-08-26 17:56:12,987 INFO L82 GeneralOperation]: Start removeDead. Operand has 184 places, 193 transitions, 476 flow [2023-08-26 17:56:12,988 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 119 places, 120 transitions, 288 flow [2023-08-26 17:56:12,988 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:56:12,988 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 119 places, 120 transitions, 288 flow [2023-08-26 17:56:12,988 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 119 places, 120 transitions, 288 flow [2023-08-26 17:56:12,988 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 119 places, 120 transitions, 288 flow [2023-08-26 17:56:12,996 INFO L124 PetriNetUnfolderBase]: 20/188 cut-off events. [2023-08-26 17:56:12,997 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 17:56:12,997 INFO L83 FinitePrefix]: Finished finitePrefix Result has 222 conditions, 188 events. 20/188 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 444 event pairs, 0 based on Foata normal form. 0/147 useless extension candidates. Maximal degree in co-relation 192. Up to 12 conditions per place. [2023-08-26 17:56:13,001 INFO L119 LiptonReduction]: Number of co-enabled transitions 7708 [2023-08-26 17:56:14,308 INFO L134 LiptonReduction]: Checked pairs total: 29769 [2023-08-26 17:56:14,308 INFO L136 LiptonReduction]: Total number of compositions: 74 [2023-08-26 17:56:14,309 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:56:14,309 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;@1d1ae1a2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:56:14,309 INFO L358 AbstractCegarLoop]: Starting to check reachability of 10 error locations. [2023-08-26 17:56:14,310 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:56:14,310 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 17:56:14,310 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:56:14,310 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:56:14,310 INFO L208 CegarLoopForPetriNet]: trace histogram [1] [2023-08-26 17:56:14,310 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-08-26 17:56:14,310 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:56:14,310 INFO L85 PathProgramCache]: Analyzing trace with hash 1596, now seen corresponding path program 1 times [2023-08-26 17:56:14,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:56:14,311 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750717821] [2023-08-26 17:56:14,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:56:14,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:56:14,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:56:14,314 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 17:56:14,314 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:56:14,314 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750717821] [2023-08-26 17:56:14,315 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750717821] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:56:14,315 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:56:14,315 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [0] imperfect sequences [] total 0 [2023-08-26 17:56:14,315 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911607407] [2023-08-26 17:56:14,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:56:14,315 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-26 17:56:14,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:56:14,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-26 17:56:14,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-26 17:56:14,316 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 126 out of 267 [2023-08-26 17:56:14,317 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 67 transitions, 182 flow. Second operand has 2 states, 2 states have (on average 126.5) internal successors, (253), 2 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:14,317 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:56:14,317 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 126 of 267 [2023-08-26 17:56:14,317 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:56:17,699 INFO L124 PetriNetUnfolderBase]: 34344/52920 cut-off events. [2023-08-26 17:56:17,699 INFO L125 PetriNetUnfolderBase]: For 10885/10885 co-relation queries the response was YES. [2023-08-26 17:56:17,840 INFO L83 FinitePrefix]: Finished finitePrefix Result has 99320 conditions, 52920 events. 34344/52920 cut-off events. For 10885/10885 co-relation queries the response was YES. Maximal size of possible extension queue 2117. Compared 422760 event pairs, 22777 based on Foata normal form. 1336/49481 useless extension candidates. Maximal degree in co-relation 99306. Up to 41026 conditions per place. [2023-08-26 17:56:18,030 INFO L140 encePairwiseOnDemand]: 256/267 looper letters, 25 selfloop transitions, 0 changer transitions 0/55 dead transitions. [2023-08-26 17:56:18,030 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 64 places, 55 transitions, 208 flow [2023-08-26 17:56:18,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-26 17:56:18,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-26 17:56:18,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 288 transitions. [2023-08-26 17:56:18,031 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5393258426966292 [2023-08-26 17:56:18,032 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 288 transitions. [2023-08-26 17:56:18,032 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 288 transitions. [2023-08-26 17:56:18,032 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:56:18,032 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 288 transitions. [2023-08-26 17:56:18,033 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 144.0) internal successors, (288), 2 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 17:56:18,033 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 267.0) internal successors, (801), 3 states have internal predecessors, (801), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:18,034 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 267.0) internal successors, (801), 3 states have internal predecessors, (801), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:18,034 INFO L175 Difference]: Start difference. First operand has 73 places, 67 transitions, 182 flow. Second operand 2 states and 288 transitions. [2023-08-26 17:56:18,034 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 64 places, 55 transitions, 208 flow [2023-08-26 17:56:18,041 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 63 places, 55 transitions, 187 flow, removed 10 selfloop flow, removed 1 redundant places. [2023-08-26 17:56:18,042 INFO L231 Difference]: Finished difference. Result has 63 places, 55 transitions, 137 flow [2023-08-26 17:56:18,042 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=267, PETRI_DIFFERENCE_MINUEND_FLOW=137, PETRI_DIFFERENCE_MINUEND_PLACES=62, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=55, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=137, PETRI_PLACES=63, PETRI_TRANSITIONS=55} [2023-08-26 17:56:18,042 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, -10 predicate places. [2023-08-26 17:56:18,043 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 55 transitions, 137 flow [2023-08-26 17:56:18,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 126.5) internal successors, (253), 2 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:18,043 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:56:18,043 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:56:18,043 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2023-08-26 17:56:18,043 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-08-26 17:56:18,043 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:56:18,043 INFO L85 PathProgramCache]: Analyzing trace with hash 49050337, now seen corresponding path program 1 times [2023-08-26 17:56:18,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:56:18,044 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105839744] [2023-08-26 17:56:18,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:56:18,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:56:18,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:56:18,070 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 17:56:18,070 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:56:18,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105839744] [2023-08-26 17:56:18,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105839744] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:56:18,070 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:56:18,070 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:56:18,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486774867] [2023-08-26 17:56:18,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:56:18,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:56:18,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:56:18,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:56:18,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:56:18,072 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 114 out of 267 [2023-08-26 17:56:18,072 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 55 transitions, 137 flow. Second operand has 3 states, 3 states have (on average 115.33333333333333) internal successors, (346), 3 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:18,072 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:56:18,072 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 114 of 267 [2023-08-26 17:56:18,073 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:56:20,441 INFO L124 PetriNetUnfolderBase]: 24923/39259 cut-off events. [2023-08-26 17:56:20,441 INFO L125 PetriNetUnfolderBase]: For 1405/1405 co-relation queries the response was YES. [2023-08-26 17:56:20,564 INFO L83 FinitePrefix]: Finished finitePrefix Result has 71268 conditions, 39259 events. 24923/39259 cut-off events. For 1405/1405 co-relation queries the response was YES. Maximal size of possible extension queue 1591. Compared 312142 event pairs, 16455 based on Foata normal form. 0/36264 useless extension candidates. Maximal degree in co-relation 71260. Up to 29784 conditions per place. [2023-08-26 17:56:20,837 INFO L140 encePairwiseOnDemand]: 265/267 looper letters, 23 selfloop transitions, 1 changer transitions 0/54 dead transitions. [2023-08-26 17:56:20,837 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 64 places, 54 transitions, 183 flow [2023-08-26 17:56:20,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:56:20,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:56:20,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 367 transitions. [2023-08-26 17:56:20,838 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4581772784019975 [2023-08-26 17:56:20,838 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 367 transitions. [2023-08-26 17:56:20,838 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 367 transitions. [2023-08-26 17:56:20,839 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:56:20,839 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 367 transitions. [2023-08-26 17:56:20,839 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 122.33333333333333) internal successors, (367), 3 states have internal predecessors, (367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:20,840 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:20,841 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:20,841 INFO L175 Difference]: Start difference. First operand has 63 places, 55 transitions, 137 flow. Second operand 3 states and 367 transitions. [2023-08-26 17:56:20,841 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 64 places, 54 transitions, 183 flow [2023-08-26 17:56:20,842 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 64 places, 54 transitions, 183 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 17:56:20,842 INFO L231 Difference]: Finished difference. Result has 64 places, 54 transitions, 137 flow [2023-08-26 17:56:20,842 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=267, PETRI_DIFFERENCE_MINUEND_FLOW=135, PETRI_DIFFERENCE_MINUEND_PLACES=62, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=54, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=53, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=137, PETRI_PLACES=64, PETRI_TRANSITIONS=54} [2023-08-26 17:56:20,843 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, -9 predicate places. [2023-08-26 17:56:20,843 INFO L495 AbstractCegarLoop]: Abstraction has has 64 places, 54 transitions, 137 flow [2023-08-26 17:56:20,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 115.33333333333333) internal successors, (346), 3 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:20,843 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:56:20,843 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:56:20,843 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2023-08-26 17:56:20,843 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-08-26 17:56:20,844 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:56:20,844 INFO L85 PathProgramCache]: Analyzing trace with hash 49050338, now seen corresponding path program 1 times [2023-08-26 17:56:20,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:56:20,844 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941681891] [2023-08-26 17:56:20,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:56:20,844 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:56:20,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:56:20,867 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 17:56:20,868 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:56:20,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941681891] [2023-08-26 17:56:20,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941681891] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:56:20,868 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:56:20,868 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:56:20,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671437587] [2023-08-26 17:56:20,869 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:56:20,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:56:20,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:56:20,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:56:20,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:56:20,870 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 113 out of 267 [2023-08-26 17:56:20,871 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 54 transitions, 137 flow. Second operand has 3 states, 3 states have (on average 114.33333333333333) internal successors, (343), 3 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:20,871 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:56:20,871 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 113 of 267 [2023-08-26 17:56:20,871 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:56:22,553 INFO L124 PetriNetUnfolderBase]: 15502/25598 cut-off events. [2023-08-26 17:56:22,553 INFO L125 PetriNetUnfolderBase]: For 1405/1405 co-relation queries the response was YES. [2023-08-26 17:56:22,612 INFO L83 FinitePrefix]: Finished finitePrefix Result has 46368 conditions, 25598 events. 15502/25598 cut-off events. For 1405/1405 co-relation queries the response was YES. Maximal size of possible extension queue 1065. Compared 203199 event pairs, 10133 based on Foata normal form. 0/24383 useless extension candidates. Maximal degree in co-relation 46359. Up to 18543 conditions per place. [2023-08-26 17:56:22,670 INFO L140 encePairwiseOnDemand]: 265/267 looper letters, 21 selfloop transitions, 1 changer transitions 1/53 dead transitions. [2023-08-26 17:56:22,670 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 53 transitions, 181 flow [2023-08-26 17:56:22,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:56:22,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:56:22,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 363 transitions. [2023-08-26 17:56:22,671 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45318352059925093 [2023-08-26 17:56:22,671 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 363 transitions. [2023-08-26 17:56:22,671 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 363 transitions. [2023-08-26 17:56:22,671 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:56:22,671 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 363 transitions. [2023-08-26 17:56:22,672 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 121.0) internal successors, (363), 3 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:22,673 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:22,673 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:22,673 INFO L175 Difference]: Start difference. First operand has 64 places, 54 transitions, 137 flow. Second operand 3 states and 363 transitions. [2023-08-26 17:56:22,673 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 53 transitions, 181 flow [2023-08-26 17:56:22,674 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 64 places, 53 transitions, 180 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:56:22,674 INFO L231 Difference]: Finished difference. Result has 64 places, 52 transitions, 134 flow [2023-08-26 17:56:22,674 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=267, PETRI_DIFFERENCE_MINUEND_FLOW=134, PETRI_DIFFERENCE_MINUEND_PLACES=62, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=53, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=52, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=134, PETRI_PLACES=64, PETRI_TRANSITIONS=52} [2023-08-26 17:56:22,674 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, -9 predicate places. [2023-08-26 17:56:22,675 INFO L495 AbstractCegarLoop]: Abstraction has has 64 places, 52 transitions, 134 flow [2023-08-26 17:56:22,675 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 114.33333333333333) internal successors, (343), 3 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:56:22,675 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:56:22,675 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 17:56:22,675 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2023-08-26 17:56:22,675 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-08-26 17:56:22,675 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:56:22,675 INFO L85 PathProgramCache]: Analyzing trace with hash 1520450533, now seen corresponding path program 1 times [2023-08-26 17:56:22,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:56:22,675 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993971904] [2023-08-26 17:56:22,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:56:22,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:56:22,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:56:22,697 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 17:56:22,698 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:56:22,698 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993971904] [2023-08-26 17:56:22,698 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993971904] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:56:22,698 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:56:22,698 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:56:22,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583532098] [2023-08-26 17:56:22,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:56:22,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:56:22,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:56:22,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:56:22,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:56:22,699 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 99 out of 267 [2023-08-26 17:56:22,700 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 52 transitions, 134 flow. Second operand has 3 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 17:56:22,700 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:56:22,700 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 99 of 267 [2023-08-26 17:56:22,700 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:57:02,543 INFO L124 PetriNetUnfolderBase]: 517197/644785 cut-off events. [2023-08-26 17:57:02,544 INFO L125 PetriNetUnfolderBase]: For 24374/24374 co-relation queries the response was YES. [2023-08-26 17:57:04,782 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1283183 conditions, 644785 events. 517197/644785 cut-off events. For 24374/24374 co-relation queries the response was YES. Maximal size of possible extension queue 17368. Compared 4169404 event pairs, 137383 based on Foata normal form. 0/625714 useless extension candidates. Maximal degree in co-relation 1283174. Up to 599752 conditions per place. [2023-08-26 17:57:07,327 INFO L140 encePairwiseOnDemand]: 260/267 looper letters, 55 selfloop transitions, 6 changer transitions 0/75 dead transitions. [2023-08-26 17:57:07,327 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 75 transitions, 322 flow [2023-08-26 17:57:07,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:57:07,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:57:07,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 359 transitions. [2023-08-26 17:57:07,328 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44818976279650435 [2023-08-26 17:57:07,328 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 359 transitions. [2023-08-26 17:57:07,329 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 359 transitions. [2023-08-26 17:57:07,329 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:57:07,329 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 359 transitions. [2023-08-26 17:57:07,329 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 119.66666666666667) internal successors, (359), 3 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:07,330 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:07,330 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:07,330 INFO L175 Difference]: Start difference. First operand has 64 places, 52 transitions, 134 flow. Second operand 3 states and 359 transitions. [2023-08-26 17:57:07,330 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 75 transitions, 322 flow [2023-08-26 17:57:07,344 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 64 places, 75 transitions, 321 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:57:07,345 INFO L231 Difference]: Finished difference. Result has 65 places, 57 transitions, 173 flow [2023-08-26 17:57:07,345 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=267, PETRI_DIFFERENCE_MINUEND_FLOW=133, PETRI_DIFFERENCE_MINUEND_PLACES=62, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=52, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=46, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=173, PETRI_PLACES=65, PETRI_TRANSITIONS=57} [2023-08-26 17:57:07,346 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, -8 predicate places. [2023-08-26 17:57:07,346 INFO L495 AbstractCegarLoop]: Abstraction has has 65 places, 57 transitions, 173 flow [2023-08-26 17:57:07,346 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 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 17:57:07,346 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:57:07,346 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:57:07,347 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2023-08-26 17:57:07,347 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-08-26 17:57:07,347 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:57:07,347 INFO L85 PathProgramCache]: Analyzing trace with hash 1682715216, now seen corresponding path program 1 times [2023-08-26 17:57:07,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:57:07,347 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423636453] [2023-08-26 17:57:07,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:57:07,347 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:57:07,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:57:07,375 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 17:57:07,375 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:57:07,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423636453] [2023-08-26 17:57:07,376 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1423636453] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:57:07,376 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:57:07,376 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 17:57:07,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688658604] [2023-08-26 17:57:07,376 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:57:07,376 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:57:07,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:57:07,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:57:07,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:57:07,377 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 125 out of 267 [2023-08-26 17:57:07,377 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 65 places, 57 transitions, 173 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 17:57:07,377 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:57:07,377 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 125 of 267 [2023-08-26 17:57:07,377 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:57:07,606 INFO L124 PetriNetUnfolderBase]: 1396/4417 cut-off events. [2023-08-26 17:57:07,606 INFO L125 PetriNetUnfolderBase]: For 643/643 co-relation queries the response was YES. [2023-08-26 17:57:07,617 INFO L83 FinitePrefix]: Finished finitePrefix Result has 8043 conditions, 4417 events. 1396/4417 cut-off events. For 643/643 co-relation queries the response was YES. Maximal size of possible extension queue 164. Compared 38722 event pairs, 287 based on Foata normal form. 2922/7307 useless extension candidates. Maximal degree in co-relation 8033. Up to 1547 conditions per place. [2023-08-26 17:57:07,625 INFO L140 encePairwiseOnDemand]: 255/267 looper letters, 17 selfloop transitions, 12 changer transitions 0/64 dead transitions. [2023-08-26 17:57:07,625 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 67 places, 64 transitions, 268 flow [2023-08-26 17:57:07,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:57:07,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:57:07,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 410 transitions. [2023-08-26 17:57:07,626 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5118601747815231 [2023-08-26 17:57:07,626 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 410 transitions. [2023-08-26 17:57:07,626 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 410 transitions. [2023-08-26 17:57:07,626 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:57:07,626 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 410 transitions. [2023-08-26 17:57:07,627 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 136.66666666666666) internal successors, (410), 3 states have internal predecessors, (410), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:07,628 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:07,628 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:07,628 INFO L175 Difference]: Start difference. First operand has 65 places, 57 transitions, 173 flow. Second operand 3 states and 410 transitions. [2023-08-26 17:57:07,628 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 67 places, 64 transitions, 268 flow [2023-08-26 17:57:07,629 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 66 places, 64 transitions, 262 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:57:07,630 INFO L231 Difference]: Finished difference. Result has 66 places, 57 transitions, 191 flow [2023-08-26 17:57:07,630 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=267, PETRI_DIFFERENCE_MINUEND_FLOW=167, PETRI_DIFFERENCE_MINUEND_PLACES=64, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=57, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=12, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=45, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=191, PETRI_PLACES=66, PETRI_TRANSITIONS=57} [2023-08-26 17:57:07,630 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, -7 predicate places. [2023-08-26 17:57:07,630 INFO L495 AbstractCegarLoop]: Abstraction has has 66 places, 57 transitions, 191 flow [2023-08-26 17:57:07,631 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 17:57:07,631 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:57:07,631 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:57:07,631 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2023-08-26 17:57:07,631 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-08-26 17:57:07,631 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:57:07,631 INFO L85 PathProgramCache]: Analyzing trace with hash -558125875, now seen corresponding path program 1 times [2023-08-26 17:57:07,631 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:57:07,631 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784303411] [2023-08-26 17:57:07,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:57:07,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:57:07,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:57:07,663 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 17:57:07,664 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:57:07,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784303411] [2023-08-26 17:57:07,664 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784303411] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:57:07,664 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:57:07,664 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 17:57:07,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223402650] [2023-08-26 17:57:07,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:57:07,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 17:57:07,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:57:07,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 17:57:07,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-08-26 17:57:07,665 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 93 out of 267 [2023-08-26 17:57:07,666 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 66 places, 57 transitions, 191 flow. Second operand has 5 states, 5 states have (on average 95.6) internal successors, (478), 5 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:07,666 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:57:07,666 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 93 of 267 [2023-08-26 17:57:07,666 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:57:08,337 INFO L124 PetriNetUnfolderBase]: 4185/8445 cut-off events. [2023-08-26 17:57:08,337 INFO L125 PetriNetUnfolderBase]: For 2742/2743 co-relation queries the response was YES. [2023-08-26 17:57:08,355 INFO L83 FinitePrefix]: Finished finitePrefix Result has 22631 conditions, 8445 events. 4185/8445 cut-off events. For 2742/2743 co-relation queries the response was YES. Maximal size of possible extension queue 404. Compared 72640 event pairs, 167 based on Foata normal form. 30/8473 useless extension candidates. Maximal degree in co-relation 22621. Up to 6538 conditions per place. [2023-08-26 17:57:08,377 INFO L140 encePairwiseOnDemand]: 250/267 looper letters, 93 selfloop transitions, 21 changer transitions 0/123 dead transitions. [2023-08-26 17:57:08,377 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 71 places, 123 transitions, 679 flow [2023-08-26 17:57:08,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 17:57:08,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 17:57:08,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 673 transitions. [2023-08-26 17:57:08,378 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42009987515605496 [2023-08-26 17:57:08,378 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 673 transitions. [2023-08-26 17:57:08,378 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 673 transitions. [2023-08-26 17:57:08,378 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:57:08,378 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 673 transitions. [2023-08-26 17:57:08,379 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 112.16666666666667) internal successors, (673), 6 states have internal predecessors, (673), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:08,381 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 267.0) internal successors, (1869), 7 states have internal predecessors, (1869), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:08,381 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 267.0) internal successors, (1869), 7 states have internal predecessors, (1869), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:08,381 INFO L175 Difference]: Start difference. First operand has 66 places, 57 transitions, 191 flow. Second operand 6 states and 673 transitions. [2023-08-26 17:57:08,381 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 71 places, 123 transitions, 679 flow [2023-08-26 17:57:08,389 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 70 places, 123 transitions, 648 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:57:08,390 INFO L231 Difference]: Finished difference. Result has 73 places, 72 transitions, 323 flow [2023-08-26 17:57:08,391 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=267, PETRI_DIFFERENCE_MINUEND_FLOW=179, PETRI_DIFFERENCE_MINUEND_PLACES=65, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=57, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=36, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=323, PETRI_PLACES=73, PETRI_TRANSITIONS=72} [2023-08-26 17:57:08,391 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 0 predicate places. [2023-08-26 17:57:08,391 INFO L495 AbstractCegarLoop]: Abstraction has has 73 places, 72 transitions, 323 flow [2023-08-26 17:57:08,391 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 95.6) internal successors, (478), 5 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:08,391 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:57:08,391 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:57:08,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2023-08-26 17:57:08,392 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-08-26 17:57:08,392 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:57:08,392 INFO L85 PathProgramCache]: Analyzing trace with hash -1537223688, now seen corresponding path program 2 times [2023-08-26 17:57:08,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:57:08,392 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663086981] [2023-08-26 17:57:08,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:57:08,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:57:08,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:57:08,500 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:57:08,500 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:57:08,500 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663086981] [2023-08-26 17:57:08,500 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663086981] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:57:08,500 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065399764] [2023-08-26 17:57:08,501 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 17:57:08,501 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:57:08,501 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:57:08,501 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 17:57:08,503 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-08-26 17:57:08,593 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 17:57:08,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 17:57:08,594 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2023-08-26 17:57:08,595 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:57:08,691 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:57:08,691 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:57:08,770 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:57:08,770 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065399764] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:57:08,770 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:57:08,770 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2023-08-26 17:57:08,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851884425] [2023-08-26 17:57:08,770 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:57:08,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-08-26 17:57:08,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:57:08,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-08-26 17:57:08,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2023-08-26 17:57:08,772 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 92 out of 267 [2023-08-26 17:57:08,773 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 72 transitions, 323 flow. Second operand has 20 states, 20 states have (on average 94.85) internal successors, (1897), 20 states have internal predecessors, (1897), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:08,773 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:57:08,773 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 92 of 267 [2023-08-26 17:57:08,773 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:57:10,005 INFO L124 PetriNetUnfolderBase]: 6055/11987 cut-off events. [2023-08-26 17:57:10,006 INFO L125 PetriNetUnfolderBase]: For 5536/5537 co-relation queries the response was YES. [2023-08-26 17:57:10,036 INFO L83 FinitePrefix]: Finished finitePrefix Result has 33467 conditions, 11987 events. 6055/11987 cut-off events. For 5536/5537 co-relation queries the response was YES. Maximal size of possible extension queue 626. Compared 109700 event pairs, 89 based on Foata normal form. 70/12055 useless extension candidates. Maximal degree in co-relation 33453. Up to 6718 conditions per place. [2023-08-26 17:57:10,068 INFO L140 encePairwiseOnDemand]: 245/267 looper letters, 126 selfloop transitions, 46 changer transitions 0/181 dead transitions. [2023-08-26 17:57:10,068 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 83 places, 181 transitions, 1136 flow [2023-08-26 17:57:10,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-08-26 17:57:10,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2023-08-26 17:57:10,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 1185 transitions. [2023-08-26 17:57:10,070 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4034729315628192 [2023-08-26 17:57:10,070 INFO L72 ComplementDD]: Start complementDD. Operand 11 states and 1185 transitions. [2023-08-26 17:57:10,070 INFO L73 IsDeterministic]: Start isDeterministic. Operand 11 states and 1185 transitions. [2023-08-26 17:57:10,070 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:57:10,070 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 11 states and 1185 transitions. [2023-08-26 17:57:10,072 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 12 states, 11 states have (on average 107.72727272727273) internal successors, (1185), 11 states have internal predecessors, (1185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:10,074 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 12 states, 12 states have (on average 267.0) internal successors, (3204), 12 states have internal predecessors, (3204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:10,074 INFO L81 ComplementDD]: Finished complementDD. Result has 12 states, 12 states have (on average 267.0) internal successors, (3204), 12 states have internal predecessors, (3204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:10,074 INFO L175 Difference]: Start difference. First operand has 73 places, 72 transitions, 323 flow. Second operand 11 states and 1185 transitions. [2023-08-26 17:57:10,074 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 83 places, 181 transitions, 1136 flow [2023-08-26 17:57:10,090 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 81 places, 181 transitions, 1114 flow, removed 5 selfloop flow, removed 2 redundant places. [2023-08-26 17:57:10,092 INFO L231 Difference]: Finished difference. Result has 86 places, 97 transitions, 581 flow [2023-08-26 17:57:10,092 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=267, PETRI_DIFFERENCE_MINUEND_FLOW=301, PETRI_DIFFERENCE_MINUEND_PLACES=71, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=72, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=21, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=11, PETRI_FLOW=581, PETRI_PLACES=86, PETRI_TRANSITIONS=97} [2023-08-26 17:57:10,092 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 13 predicate places. [2023-08-26 17:57:10,093 INFO L495 AbstractCegarLoop]: Abstraction has has 86 places, 97 transitions, 581 flow [2023-08-26 17:57:10,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 94.85) internal successors, (1897), 20 states have internal predecessors, (1897), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:10,093 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:57:10,093 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:57:10,098 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-08-26 17:57:10,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:57:10,297 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-08-26 17:57:10,297 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:57:10,297 INFO L85 PathProgramCache]: Analyzing trace with hash -1404139793, now seen corresponding path program 3 times [2023-08-26 17:57:10,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:57:10,297 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150756036] [2023-08-26 17:57:10,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:57:10,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:57:10,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:57:10,430 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:57:10,431 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:57:10,431 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1150756036] [2023-08-26 17:57:10,431 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1150756036] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 17:57:10,431 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [111879163] [2023-08-26 17:57:10,431 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-08-26 17:57:10,431 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 17:57:10,431 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:57:10,439 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 17:57:10,442 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-08-26 17:57:10,564 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-08-26 17:57:10,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 17:57:10,565 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 11 conjunts are in the unsatisfiable core [2023-08-26 17:57:10,567 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 17:57:10,747 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:57:10,747 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 17:57:10,898 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:57:10,898 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [111879163] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 17:57:10,898 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 17:57:10,898 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 25 [2023-08-26 17:57:10,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581825041] [2023-08-26 17:57:10,898 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 17:57:10,899 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-08-26 17:57:10,899 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:57:10,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-08-26 17:57:10,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2023-08-26 17:57:10,901 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 92 out of 267 [2023-08-26 17:57:10,902 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 86 places, 97 transitions, 581 flow. Second operand has 27 states, 27 states have (on average 94.77777777777777) internal successors, (2559), 27 states have internal predecessors, (2559), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:10,902 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:57:10,902 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 92 of 267 [2023-08-26 17:57:10,902 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:57:13,727 INFO L124 PetriNetUnfolderBase]: 12140/24030 cut-off events. [2023-08-26 17:57:13,727 INFO L125 PetriNetUnfolderBase]: For 20256/20257 co-relation queries the response was YES. [2023-08-26 17:57:13,813 INFO L83 FinitePrefix]: Finished finitePrefix Result has 76944 conditions, 24030 events. 12140/24030 cut-off events. For 20256/20257 co-relation queries the response was YES. Maximal size of possible extension queue 945. Compared 238105 event pairs, 85 based on Foata normal form. 342/24370 useless extension candidates. Maximal degree in co-relation 76925. Up to 5878 conditions per place. [2023-08-26 17:57:13,828 INFO L140 encePairwiseOnDemand]: 245/267 looper letters, 0 selfloop transitions, 0 changer transitions 230/230 dead transitions. [2023-08-26 17:57:13,829 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 99 places, 230 transitions, 1734 flow [2023-08-26 17:57:13,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-08-26 17:57:13,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2023-08-26 17:57:13,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 1564 transitions. [2023-08-26 17:57:13,830 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3905118601747815 [2023-08-26 17:57:13,831 INFO L72 ComplementDD]: Start complementDD. Operand 15 states and 1564 transitions. [2023-08-26 17:57:13,831 INFO L73 IsDeterministic]: Start isDeterministic. Operand 15 states and 1564 transitions. [2023-08-26 17:57:13,831 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:57:13,831 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 15 states and 1564 transitions. [2023-08-26 17:57:13,832 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 16 states, 15 states have (on average 104.26666666666667) internal successors, (1564), 15 states have internal predecessors, (1564), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:13,835 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 16 states, 16 states have (on average 267.0) internal successors, (4272), 16 states have internal predecessors, (4272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:13,835 INFO L81 ComplementDD]: Finished complementDD. Result has 16 states, 16 states have (on average 267.0) internal successors, (4272), 16 states have internal predecessors, (4272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:13,835 INFO L175 Difference]: Start difference. First operand has 86 places, 97 transitions, 581 flow. Second operand 15 states and 1564 transitions. [2023-08-26 17:57:13,835 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 99 places, 230 transitions, 1734 flow [2023-08-26 17:57:13,945 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 94 places, 230 transitions, 1652 flow, removed 20 selfloop flow, removed 5 redundant places. [2023-08-26 17:57:13,947 INFO L231 Difference]: Finished difference. Result has 94 places, 0 transitions, 0 flow [2023-08-26 17:57:13,947 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=267, PETRI_DIFFERENCE_MINUEND_FLOW=491, PETRI_DIFFERENCE_MINUEND_PLACES=80, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=96, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=96, PETRI_DIFFERENCE_SUBTRAHEND_STATES=15, PETRI_FLOW=0, PETRI_PLACES=94, PETRI_TRANSITIONS=0} [2023-08-26 17:57:13,947 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 21 predicate places. [2023-08-26 17:57:13,948 INFO L495 AbstractCegarLoop]: Abstraction has has 94 places, 0 transitions, 0 flow [2023-08-26 17:57:13,948 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 94.77777777777777) internal successors, (2559), 27 states have internal predecessors, (2559), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:13,948 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (9 of 10 remaining) [2023-08-26 17:57:13,948 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 10 remaining) [2023-08-26 17:57:13,948 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 10 remaining) [2023-08-26 17:57:13,949 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (6 of 10 remaining) [2023-08-26 17:57:13,949 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 10 remaining) [2023-08-26 17:57:13,949 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 10 remaining) [2023-08-26 17:57:13,949 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 10 remaining) [2023-08-26 17:57:13,949 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 10 remaining) [2023-08-26 17:57:13,949 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 10 remaining) [2023-08-26 17:57:13,949 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 10 remaining) [2023-08-26 17:57:13,957 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-08-26 17:57:14,157 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2023-08-26 17:57:14,157 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1, 1, 1, 1, 1] [2023-08-26 17:57:14,157 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 17:57:14,159 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 184 places, 193 transitions, 476 flow [2023-08-26 17:57:14,168 INFO L124 PetriNetUnfolderBase]: 20/188 cut-off events. [2023-08-26 17:57:14,168 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 17:57:14,168 INFO L83 FinitePrefix]: Finished finitePrefix Result has 226 conditions, 188 events. 20/188 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 440 event pairs, 0 based on Foata normal form. 0/147 useless extension candidates. Maximal degree in co-relation 215. Up to 12 conditions per place. [2023-08-26 17:57:14,168 INFO L82 GeneralOperation]: Start removeDead. Operand has 184 places, 193 transitions, 476 flow [2023-08-26 17:57:14,169 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 117 places, 118 transitions, 284 flow [2023-08-26 17:57:14,169 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:57:14,169 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 117 places, 118 transitions, 284 flow [2023-08-26 17:57:14,169 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 117 places, 118 transitions, 284 flow [2023-08-26 17:57:14,169 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 117 places, 118 transitions, 284 flow [2023-08-26 17:57:14,178 INFO L124 PetriNetUnfolderBase]: 20/186 cut-off events. [2023-08-26 17:57:14,178 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 17:57:14,179 INFO L83 FinitePrefix]: Finished finitePrefix Result has 220 conditions, 186 events. 20/186 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 439 event pairs, 0 based on Foata normal form. 0/147 useless extension candidates. Maximal degree in co-relation 192. Up to 12 conditions per place. [2023-08-26 17:57:14,182 INFO L119 LiptonReduction]: Number of co-enabled transitions 7708 [2023-08-26 17:57:15,373 INFO L134 LiptonReduction]: Checked pairs total: 30111 [2023-08-26 17:57:15,373 INFO L136 LiptonReduction]: Total number of compositions: 70 [2023-08-26 17:57:15,374 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 17:57:15,374 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;@1d1ae1a2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:57:15,375 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-08-26 17:57:15,380 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:57:15,380 INFO L124 PetriNetUnfolderBase]: 7/88 cut-off events. [2023-08-26 17:57:15,380 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 17:57:15,380 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:57:15,380 INFO L208 CegarLoopForPetriNet]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:57:15,380 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 17:57:15,380 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:57:15,380 INFO L85 PathProgramCache]: Analyzing trace with hash -1112799923, now seen corresponding path program 1 times [2023-08-26 17:57:15,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:57:15,381 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948887714] [2023-08-26 17:57:15,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:57:15,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:57:15,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:57:15,390 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 17:57:15,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:57:15,399 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 17:57:15,399 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 17:57:15,400 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2023-08-26 17:57:15,400 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 2 remaining) [2023-08-26 17:57:15,400 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2023-08-26 17:57:15,400 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 17:57:15,400 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE,UNKNOWN (2/2) [2023-08-26 17:57:15,400 WARN L233 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 17:57:15,400 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2023-08-26 17:57:15,428 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:57:15,430 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 213 places, 224 transitions, 568 flow [2023-08-26 17:57:15,445 INFO L124 PetriNetUnfolderBase]: 23/215 cut-off events. [2023-08-26 17:57:15,445 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-26 17:57:15,446 INFO L83 FinitePrefix]: Finished finitePrefix Result has 263 conditions, 215 events. 23/215 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 485 event pairs, 0 based on Foata normal form. 0/168 useless extension candidates. Maximal degree in co-relation 250. Up to 14 conditions per place. [2023-08-26 17:57:15,446 INFO L82 GeneralOperation]: Start removeDead. Operand has 213 places, 224 transitions, 568 flow [2023-08-26 17:57:15,447 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 132 places, 133 transitions, 329 flow [2023-08-26 17:57:15,447 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:57:15,447 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 132 places, 133 transitions, 329 flow [2023-08-26 17:57:15,448 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 132 places, 133 transitions, 329 flow [2023-08-26 17:57:15,448 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 132 places, 133 transitions, 329 flow [2023-08-26 17:57:15,458 INFO L124 PetriNetUnfolderBase]: 23/215 cut-off events. [2023-08-26 17:57:15,458 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-26 17:57:15,459 INFO L83 FinitePrefix]: Finished finitePrefix Result has 258 conditions, 215 events. 23/215 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 489 event pairs, 0 based on Foata normal form. 0/168 useless extension candidates. Maximal degree in co-relation 227. Up to 14 conditions per place. [2023-08-26 17:57:15,461 INFO L119 LiptonReduction]: Number of co-enabled transitions 10070 [2023-08-26 17:57:16,783 INFO L134 LiptonReduction]: Checked pairs total: 35293 [2023-08-26 17:57:16,783 INFO L136 LiptonReduction]: Total number of compositions: 82 [2023-08-26 17:57:16,784 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:57:16,784 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;@1d1ae1a2, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:57:16,784 INFO L358 AbstractCegarLoop]: Starting to check reachability of 11 error locations. [2023-08-26 17:57:16,785 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:57:16,785 INFO L124 PetriNetUnfolderBase]: 0/0 cut-off events. [2023-08-26 17:57:16,785 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:57:16,785 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:57:16,785 INFO L208 CegarLoopForPetriNet]: trace histogram [1] [2023-08-26 17:57:16,785 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 8 more)] === [2023-08-26 17:57:16,785 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:57:16,786 INFO L85 PathProgramCache]: Analyzing trace with hash 2004, now seen corresponding path program 1 times [2023-08-26 17:57:16,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:57:16,786 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956723347] [2023-08-26 17:57:16,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:57:16,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:57:16,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:57:16,790 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 17:57:16,790 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:57:16,790 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956723347] [2023-08-26 17:57:16,791 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956723347] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:57:16,791 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:57:16,791 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [0] imperfect sequences [] total 0 [2023-08-26 17:57:16,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226589234] [2023-08-26 17:57:16,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:57:16,791 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-08-26 17:57:16,791 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:57:16,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-08-26 17:57:16,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-08-26 17:57:16,792 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 144 out of 306 [2023-08-26 17:57:16,793 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 83 places, 76 transitions, 215 flow. Second operand has 2 states, 2 states have (on average 144.5) internal successors, (289), 2 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 17:57:16,793 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:57:16,793 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 144 of 306 [2023-08-26 17:57:16,793 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:57:29,565 INFO L124 PetriNetUnfolderBase]: 123039/178875 cut-off events. [2023-08-26 17:57:29,565 INFO L125 PetriNetUnfolderBase]: For 48145/48145 co-relation queries the response was YES. [2023-08-26 17:57:30,334 INFO L83 FinitePrefix]: Finished finitePrefix Result has 341106 conditions, 178875 events. 123039/178875 cut-off events. For 48145/48145 co-relation queries the response was YES. Maximal size of possible extension queue 6195. Compared 1472268 event pairs, 81664 based on Foata normal form. 4009/168555 useless extension candidates. Maximal degree in co-relation 341091. Up to 143086 conditions per place. [2023-08-26 17:57:31,252 INFO L140 encePairwiseOnDemand]: 294/306 looper letters, 28 selfloop transitions, 0 changer transitions 0/63 dead transitions. [2023-08-26 17:57:31,253 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 73 places, 63 transitions, 245 flow [2023-08-26 17:57:31,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-08-26 17:57:31,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-08-26 17:57:31,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 328 transitions. [2023-08-26 17:57:31,254 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5359477124183006 [2023-08-26 17:57:31,254 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 328 transitions. [2023-08-26 17:57:31,254 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 328 transitions. [2023-08-26 17:57:31,254 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:57:31,254 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 328 transitions. [2023-08-26 17:57:31,254 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 164.0) internal successors, (328), 2 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:31,255 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 306.0) internal successors, (918), 3 states have internal predecessors, (918), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:31,255 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 306.0) internal successors, (918), 3 states have internal predecessors, (918), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:31,255 INFO L175 Difference]: Start difference. First operand has 83 places, 76 transitions, 215 flow. Second operand 2 states and 328 transitions. [2023-08-26 17:57:31,255 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 73 places, 63 transitions, 245 flow [2023-08-26 17:57:31,282 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 72 places, 63 transitions, 214 flow, removed 15 selfloop flow, removed 1 redundant places. [2023-08-26 17:57:31,283 INFO L231 Difference]: Finished difference. Result has 72 places, 63 transitions, 158 flow [2023-08-26 17:57:31,283 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=306, PETRI_DIFFERENCE_MINUEND_FLOW=158, PETRI_DIFFERENCE_MINUEND_PLACES=71, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=63, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=63, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=158, PETRI_PLACES=72, PETRI_TRANSITIONS=63} [2023-08-26 17:57:31,283 INFO L281 CegarLoopForPetriNet]: 83 programPoint places, -11 predicate places. [2023-08-26 17:57:31,284 INFO L495 AbstractCegarLoop]: Abstraction has has 72 places, 63 transitions, 158 flow [2023-08-26 17:57:31,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 144.5) internal successors, (289), 2 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 17:57:31,284 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:57:31,284 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:57:31,284 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2023-08-26 17:57:31,284 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 8 more)] === [2023-08-26 17:57:31,284 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:57:31,284 INFO L85 PathProgramCache]: Analyzing trace with hash 61599544, now seen corresponding path program 1 times [2023-08-26 17:57:31,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:57:31,285 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638660346] [2023-08-26 17:57:31,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:57:31,285 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:57:31,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:57:31,313 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 17:57:31,314 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:57:31,314 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638660346] [2023-08-26 17:57:31,314 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638660346] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:57:31,314 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:57:31,314 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:57:31,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77185513] [2023-08-26 17:57:31,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:57:31,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:57:31,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:57:31,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:57:31,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:57:31,315 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 132 out of 306 [2023-08-26 17:57:31,316 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 63 transitions, 158 flow. Second operand has 3 states, 3 states have (on average 133.33333333333334) internal successors, (400), 3 states have internal predecessors, (400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:31,316 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:57:31,316 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 132 of 306 [2023-08-26 17:57:31,316 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:57:41,389 INFO L124 PetriNetUnfolderBase]: 89318/132409 cut-off events. [2023-08-26 17:57:41,389 INFO L125 PetriNetUnfolderBase]: For 4240/4240 co-relation queries the response was YES. [2023-08-26 17:57:42,005 INFO L83 FinitePrefix]: Finished finitePrefix Result has 242989 conditions, 132409 events. 89318/132409 cut-off events. For 4240/4240 co-relation queries the response was YES. Maximal size of possible extension queue 4591. Compared 1088085 event pairs, 59061 based on Foata normal form. 0/123424 useless extension candidates. Maximal degree in co-relation 242980. Up to 103899 conditions per place. [2023-08-26 17:57:42,726 INFO L140 encePairwiseOnDemand]: 304/306 looper letters, 26 selfloop transitions, 1 changer transitions 0/62 dead transitions. [2023-08-26 17:57:42,726 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 73 places, 62 transitions, 210 flow [2023-08-26 17:57:42,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:57:42,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:57:42,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 424 transitions. [2023-08-26 17:57:42,727 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46187363834422657 [2023-08-26 17:57:42,727 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 424 transitions. [2023-08-26 17:57:42,727 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 424 transitions. [2023-08-26 17:57:42,727 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:57:42,727 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 424 transitions. [2023-08-26 17:57:42,728 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 141.33333333333334) internal successors, (424), 3 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:42,729 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 306.0) internal successors, (1224), 4 states have internal predecessors, (1224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:42,729 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 306.0) internal successors, (1224), 4 states have internal predecessors, (1224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:42,729 INFO L175 Difference]: Start difference. First operand has 72 places, 63 transitions, 158 flow. Second operand 3 states and 424 transitions. [2023-08-26 17:57:42,729 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 73 places, 62 transitions, 210 flow [2023-08-26 17:57:42,730 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 62 transitions, 210 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 17:57:42,731 INFO L231 Difference]: Finished difference. Result has 73 places, 62 transitions, 158 flow [2023-08-26 17:57:42,731 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=306, PETRI_DIFFERENCE_MINUEND_FLOW=156, PETRI_DIFFERENCE_MINUEND_PLACES=71, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=62, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=61, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=158, PETRI_PLACES=73, PETRI_TRANSITIONS=62} [2023-08-26 17:57:42,731 INFO L281 CegarLoopForPetriNet]: 83 programPoint places, -10 predicate places. [2023-08-26 17:57:42,731 INFO L495 AbstractCegarLoop]: Abstraction has has 73 places, 62 transitions, 158 flow [2023-08-26 17:57:42,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 133.33333333333334) internal successors, (400), 3 states have internal predecessors, (400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:42,737 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:57:42,737 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:57:42,737 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2023-08-26 17:57:42,737 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 8 more)] === [2023-08-26 17:57:42,737 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:57:42,737 INFO L85 PathProgramCache]: Analyzing trace with hash 61599545, now seen corresponding path program 1 times [2023-08-26 17:57:42,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:57:42,737 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1588119886] [2023-08-26 17:57:42,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:57:42,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:57:42,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:57:42,752 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 17:57:42,752 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:57:42,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1588119886] [2023-08-26 17:57:42,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1588119886] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:57:42,752 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:57:42,752 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:57:42,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284083778] [2023-08-26 17:57:42,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:57:42,753 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:57:42,753 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:57:42,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:57:42,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:57:42,754 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 131 out of 306 [2023-08-26 17:57:42,754 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 62 transitions, 158 flow. Second operand has 3 states, 3 states have (on average 132.33333333333334) internal successors, (397), 3 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:42,754 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:57:42,754 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 131 of 306 [2023-08-26 17:57:42,754 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:57:48,501 INFO L124 PetriNetUnfolderBase]: 55597/85943 cut-off events. [2023-08-26 17:57:48,502 INFO L125 PetriNetUnfolderBase]: For 4240/4240 co-relation queries the response was YES. [2023-08-26 17:57:48,911 INFO L83 FinitePrefix]: Finished finitePrefix Result has 157339 conditions, 85943 events. 55597/85943 cut-off events. For 4240/4240 co-relation queries the response was YES. Maximal size of possible extension queue 3034. Compared 717844 event pairs, 36458 based on Foata normal form. 0/82302 useless extension candidates. Maximal degree in co-relation 157329. Up to 64713 conditions per place. [2023-08-26 17:57:49,159 INFO L140 encePairwiseOnDemand]: 304/306 looper letters, 24 selfloop transitions, 1 changer transitions 1/61 dead transitions. [2023-08-26 17:57:49,159 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 61 transitions, 208 flow [2023-08-26 17:57:49,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:57:49,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:57:49,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 420 transitions. [2023-08-26 17:57:49,160 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45751633986928103 [2023-08-26 17:57:49,160 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 420 transitions. [2023-08-26 17:57:49,160 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 420 transitions. [2023-08-26 17:57:49,160 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:57:49,160 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 420 transitions. [2023-08-26 17:57:49,161 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 140.0) internal successors, (420), 3 states have internal predecessors, (420), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:49,162 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 306.0) internal successors, (1224), 4 states have internal predecessors, (1224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:49,162 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 306.0) internal successors, (1224), 4 states have internal predecessors, (1224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:49,162 INFO L175 Difference]: Start difference. First operand has 73 places, 62 transitions, 158 flow. Second operand 3 states and 420 transitions. [2023-08-26 17:57:49,162 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 61 transitions, 208 flow [2023-08-26 17:57:49,167 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 61 transitions, 207 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:57:49,167 INFO L231 Difference]: Finished difference. Result has 73 places, 60 transitions, 155 flow [2023-08-26 17:57:49,168 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=306, PETRI_DIFFERENCE_MINUEND_FLOW=155, PETRI_DIFFERENCE_MINUEND_PLACES=71, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=61, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=60, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=155, PETRI_PLACES=73, PETRI_TRANSITIONS=60} [2023-08-26 17:57:49,168 INFO L281 CegarLoopForPetriNet]: 83 programPoint places, -10 predicate places. [2023-08-26 17:57:49,168 INFO L495 AbstractCegarLoop]: Abstraction has has 73 places, 60 transitions, 155 flow [2023-08-26 17:57:49,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 132.33333333333334) internal successors, (397), 3 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:49,168 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:57:49,168 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 17:57:49,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2023-08-26 17:57:49,169 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT (and 8 more)] === [2023-08-26 17:57:49,169 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:57:49,169 INFO L85 PathProgramCache]: Analyzing trace with hash 1909452313, now seen corresponding path program 1 times [2023-08-26 17:57:49,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:57:49,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980772694] [2023-08-26 17:57:49,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:57:49,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:57:49,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:57:49,187 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 17:57:49,187 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:57:49,187 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980772694] [2023-08-26 17:57:49,187 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [980772694] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:57:49,187 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:57:49,187 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:57:49,188 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947796872] [2023-08-26 17:57:49,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:57:49,188 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:57:49,188 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:57:49,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:57:49,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:57:49,189 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 112 out of 306 [2023-08-26 17:57:49,189 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 60 transitions, 155 flow. Second operand has 3 states, 3 states have (on average 113.33333333333333) internal successors, (340), 3 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:57:49,189 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:57:49,189 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 112 of 306 [2023-08-26 17:57:49,189 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand