/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf --traceabstraction.order.of.the.error.locations.to.be.checked PROGRAM_FIRST -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml --cacsl2boogietranslator.check.unreachability.of.reach_error.function false --cacsl2boogietranslator.pointer.base.address.is.valid.at.dereference ASSERTandASSUME --cacsl2boogietranslator.pointer.to.allocated.memory.at.dereference ASSERTandASSUME --cacsl2boogietranslator.check.array.bounds.for.arrays.that.are.off.heap ASSERTandASSUME --cacsl2boogietranslator.check.if.freed.pointer.was.valid true --cacsl2boogietranslator.adapt.memory.model.on.pointer.casts.if.necessary true -i ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_01-simple_racing.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 18:41:25,851 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 18:41:25,925 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf [2023-08-26 18:41:25,931 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 18:41:25,931 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 18:41:25,961 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 18:41:25,962 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 18:41:25,962 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 18:41:25,963 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 18:41:25,966 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 18:41:25,966 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 18:41:25,967 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 18:41:25,967 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 18:41:25,969 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 18:41:25,969 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 18:41:25,969 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 18:41:25,969 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 18:41:25,969 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 18:41:25,970 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 18:41:25,970 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 18:41:25,970 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 18:41:25,971 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 18:41:25,971 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 18:41:25,971 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 18:41:25,972 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 18:41:25,972 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 18:41:25,972 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 18:41:25,972 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:41:25,973 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 18:41:25,973 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 18:41:25,974 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 18:41:25,974 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 18:41:25,974 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 18:41:25,974 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 18:41:25,974 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 18:41:25,975 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 18:41:26,289 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 18:41:26,304 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 18:41:26,306 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 18:41:26,307 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 18:41:26,308 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 18:41:26,310 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_01-simple_racing.i [2023-08-26 18:41:27,400 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 18:41:27,665 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 18:41:27,666 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_01-simple_racing.i [2023-08-26 18:41:27,677 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/17c3e669b/bdea3882d23f48fdb860b78fe19ef0ab/FLAGa2001ae52 [2023-08-26 18:41:27,687 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/17c3e669b/bdea3882d23f48fdb860b78fe19ef0ab [2023-08-26 18:41:27,689 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 18:41:27,690 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 18:41:27,691 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 18:41:27,691 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 18:41:27,693 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 18:41:27,693 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:41:27" (1/1) ... [2023-08-26 18:41:27,694 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6bb0dd6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:27, skipping insertion in model container [2023-08-26 18:41:27,694 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:41:27" (1/1) ... [2023-08-26 18:41:27,732 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 18:41:27,961 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:41:27,977 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 18:41:28,006 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 18:41:28,008 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 18:41:28,042 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:41:28,072 INFO L206 MainTranslator]: Completed translation [2023-08-26 18:41:28,073 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28 WrapperNode [2023-08-26 18:41:28,073 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 18:41:28,074 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 18:41:28,074 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 18:41:28,074 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 18:41:28,079 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,090 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,112 INFO L138 Inliner]: procedures = 170, calls = 37, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 84 [2023-08-26 18:41:28,112 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 18:41:28,113 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 18:41:28,113 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 18:41:28,113 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 18:41:28,119 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,120 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,122 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,123 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,140 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,143 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,145 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,146 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,148 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 18:41:28,157 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 18:41:28,157 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 18:41:28,157 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 18:41:28,158 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (1/1) ... [2023-08-26 18:41:28,162 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:41:28,170 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:41:28,179 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-26 18:41:28,193 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-26 18:41:28,222 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 18:41:28,222 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 18:41:28,222 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 18:41:28,222 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 18:41:28,223 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 18:41:28,223 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 18:41:28,223 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 18:41:28,223 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 18:41:28,223 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 18:41:28,223 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 18:41:28,223 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 18:41:28,225 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-26 18:41:28,352 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 18:41:28,360 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 18:41:28,562 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 18:41:28,575 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 18:41:28,575 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-08-26 18:41:28,578 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:41:28 BoogieIcfgContainer [2023-08-26 18:41:28,578 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 18:41:28,580 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 18:41:28,580 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 18:41:28,583 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 18:41:28,583 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 06:41:27" (1/3) ... [2023-08-26 18:41:28,584 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c73e7e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:41:28, skipping insertion in model container [2023-08-26 18:41:28,584 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:41:28" (2/3) ... [2023-08-26 18:41:28,584 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c73e7e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:41:28, skipping insertion in model container [2023-08-26 18:41:28,584 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:41:28" (3/3) ... [2023-08-26 18:41:28,586 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_01-simple_racing.i [2023-08-26 18:41:28,605 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 18:41:28,606 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-08-26 18:41:28,606 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 18:41:28,670 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 18:41:28,709 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 106 places, 116 transitions, 240 flow [2023-08-26 18:41:28,814 INFO L124 PetriNetUnfolderBase]: 19/159 cut-off events. [2023-08-26 18:41:28,815 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:41:28,819 INFO L83 FinitePrefix]: Finished finitePrefix Result has 165 conditions, 159 events. 19/159 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 392 event pairs, 0 based on Foata normal form. 0/127 useless extension candidates. Maximal degree in co-relation 76. Up to 4 conditions per place. [2023-08-26 18:41:28,819 INFO L82 GeneralOperation]: Start removeDead. Operand has 106 places, 116 transitions, 240 flow [2023-08-26 18:41:28,825 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 106 places, 116 transitions, 240 flow [2023-08-26 18:41:28,828 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:28,839 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 106 places, 116 transitions, 240 flow [2023-08-26 18:41:28,843 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 106 places, 116 transitions, 240 flow [2023-08-26 18:41:28,843 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 106 places, 116 transitions, 240 flow [2023-08-26 18:41:28,882 INFO L124 PetriNetUnfolderBase]: 19/159 cut-off events. [2023-08-26 18:41:28,882 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:41:28,883 INFO L83 FinitePrefix]: Finished finitePrefix Result has 165 conditions, 159 events. 19/159 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 392 event pairs, 0 based on Foata normal form. 0/127 useless extension candidates. Maximal degree in co-relation 76. Up to 4 conditions per place. [2023-08-26 18:41:28,885 INFO L119 LiptonReduction]: Number of co-enabled transitions 2744 [2023-08-26 18:41:32,034 INFO L134 LiptonReduction]: Checked pairs total: 4869 [2023-08-26 18:41:32,034 INFO L136 LiptonReduction]: Total number of compositions: 101 [2023-08-26 18:41:32,045 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:41:32,049 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;@58c2a9ea, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:41:32,050 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:41:32,051 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:41:32,051 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:41:32,052 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:41:32,052 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:32,052 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:32,052 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:32,056 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:32,056 INFO L85 PathProgramCache]: Analyzing trace with hash 14337, now seen corresponding path program 1 times [2023-08-26 18:41:32,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:32,063 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274685437] [2023-08-26 18:41:32,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:32,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:32,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:32,343 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:32,343 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:32,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274685437] [2023-08-26 18:41:32,344 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [274685437] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:32,344 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:32,344 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:32,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120985159] [2023-08-26 18:41:32,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:32,352 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:32,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:32,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:32,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:32,378 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 80 out of 217 [2023-08-26 18:41:32,380 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 31 places, 38 transitions, 84 flow. Second operand has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 3 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:32,381 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:32,381 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 80 of 217 [2023-08-26 18:41:32,382 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:32,472 INFO L124 PetriNetUnfolderBase]: 120/283 cut-off events. [2023-08-26 18:41:32,473 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:41:32,473 INFO L83 FinitePrefix]: Finished finitePrefix Result has 571 conditions, 283 events. 120/283 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 21. Compared 1308 event pairs, 0 based on Foata normal form. 25/232 useless extension candidates. Maximal degree in co-relation 527. Up to 262 conditions per place. [2023-08-26 18:41:32,476 INFO L140 encePairwiseOnDemand]: 204/217 looper letters, 32 selfloop transitions, 2 changer transitions 4/39 dead transitions. [2023-08-26 18:41:32,476 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 39 transitions, 160 flow [2023-08-26 18:41:32,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:32,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:32,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 294 transitions. [2023-08-26 18:41:32,487 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45161290322580644 [2023-08-26 18:41:32,488 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 294 transitions. [2023-08-26 18:41:32,488 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 294 transitions. [2023-08-26 18:41:32,489 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:32,491 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 294 transitions. [2023-08-26 18:41:32,494 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 98.0) internal successors, (294), 3 states have internal predecessors, (294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:32,497 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 217.0) internal successors, (868), 4 states have internal predecessors, (868), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:32,498 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 217.0) internal successors, (868), 4 states have internal predecessors, (868), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:32,499 INFO L175 Difference]: Start difference. First operand has 31 places, 38 transitions, 84 flow. Second operand 3 states and 294 transitions. [2023-08-26 18:41:32,500 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 39 transitions, 160 flow [2023-08-26 18:41:32,502 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 39 transitions, 160 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:41:32,503 INFO L231 Difference]: Finished difference. Result has 34 places, 26 transitions, 68 flow [2023-08-26 18:41:32,505 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=217, PETRI_DIFFERENCE_MINUEND_FLOW=66, PETRI_DIFFERENCE_MINUEND_PLACES=31, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=68, PETRI_PLACES=34, PETRI_TRANSITIONS=26} [2023-08-26 18:41:32,507 INFO L281 CegarLoopForPetriNet]: 31 programPoint places, 3 predicate places. [2023-08-26 18:41:32,507 INFO L495 AbstractCegarLoop]: Abstraction has has 34 places, 26 transitions, 68 flow [2023-08-26 18:41:32,508 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 3 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:32,508 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:32,508 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:32,508 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 18:41:32,508 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:32,509 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:32,509 INFO L85 PathProgramCache]: Analyzing trace with hash 14336, now seen corresponding path program 1 times [2023-08-26 18:41:32,509 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:32,509 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261490144] [2023-08-26 18:41:32,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:32,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:32,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:32,571 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:32,571 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:32,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261490144] [2023-08-26 18:41:32,571 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [261490144] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:32,572 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:32,572 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:32,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227208871] [2023-08-26 18:41:32,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:32,573 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:32,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:32,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:32,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:32,580 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 85 out of 217 [2023-08-26 18:41:32,580 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 34 places, 26 transitions, 68 flow. Second operand has 3 states, 3 states have (on average 85.66666666666667) internal successors, (257), 3 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:32,580 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:32,580 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 85 of 217 [2023-08-26 18:41:32,581 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:32,629 INFO L124 PetriNetUnfolderBase]: 88/205 cut-off events. [2023-08-26 18:41:32,629 INFO L125 PetriNetUnfolderBase]: For 17/17 co-relation queries the response was YES. [2023-08-26 18:41:32,630 INFO L83 FinitePrefix]: Finished finitePrefix Result has 452 conditions, 205 events. 88/205 cut-off events. For 17/17 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 693 event pairs, 88 based on Foata normal form. 0/175 useless extension candidates. Maximal degree in co-relation 429. Up to 202 conditions per place. [2023-08-26 18:41:32,631 INFO L140 encePairwiseOnDemand]: 214/217 looper letters, 22 selfloop transitions, 1 changer transitions 0/24 dead transitions. [2023-08-26 18:41:32,631 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 24 transitions, 110 flow [2023-08-26 18:41:32,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:32,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:32,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 280 transitions. [2023-08-26 18:41:32,635 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43010752688172044 [2023-08-26 18:41:32,635 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 280 transitions. [2023-08-26 18:41:32,635 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 280 transitions. [2023-08-26 18:41:32,635 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:32,635 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 280 transitions. [2023-08-26 18:41:32,636 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 93.33333333333333) internal successors, (280), 3 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:32,638 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 217.0) internal successors, (868), 4 states have internal predecessors, (868), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:32,638 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 217.0) internal successors, (868), 4 states have internal predecessors, (868), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:32,639 INFO L175 Difference]: Start difference. First operand has 34 places, 26 transitions, 68 flow. Second operand 3 states and 280 transitions. [2023-08-26 18:41:32,639 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 24 transitions, 110 flow [2023-08-26 18:41:32,639 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 24 transitions, 104 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-26 18:41:32,640 INFO L231 Difference]: Finished difference. Result has 28 places, 24 transitions, 60 flow [2023-08-26 18:41:32,640 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=217, PETRI_DIFFERENCE_MINUEND_FLOW=58, PETRI_DIFFERENCE_MINUEND_PLACES=26, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=24, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=60, PETRI_PLACES=28, PETRI_TRANSITIONS=24} [2023-08-26 18:41:32,641 INFO L281 CegarLoopForPetriNet]: 31 programPoint places, -3 predicate places. [2023-08-26 18:41:32,641 INFO L495 AbstractCegarLoop]: Abstraction has has 28 places, 24 transitions, 60 flow [2023-08-26 18:41:32,641 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 85.66666666666667) internal successors, (257), 3 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:32,642 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:32,642 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 18:41:32,642 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 18:41:32,642 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:32,643 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:32,643 INFO L85 PathProgramCache]: Analyzing trace with hash 427461030, now seen corresponding path program 1 times [2023-08-26 18:41:32,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:32,643 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558321358] [2023-08-26 18:41:32,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:32,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:32,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:32,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:32,750 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:32,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558321358] [2023-08-26 18:41:32,751 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1558321358] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:41:32,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852012049] [2023-08-26 18:41:32,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:32,752 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:32,752 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:41:32,759 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:41:32,775 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-26 18:41:32,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:32,835 INFO L262 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:41:32,838 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:41:32,891 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:41:32,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:32,925 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:41:32,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:32,971 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1852012049] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:41:32,971 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:41:32,972 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:41:32,972 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665527369] [2023-08-26 18:41:32,972 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:41:32,972 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:41:32,972 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:32,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:41:32,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:41:32,974 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 80 out of 217 [2023-08-26 18:41:32,975 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 28 places, 24 transitions, 60 flow. Second operand has 8 states, 8 states have (on average 81.875) internal successors, (655), 8 states have internal predecessors, (655), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:32,975 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:32,975 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 80 of 217 [2023-08-26 18:41:32,975 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:33,034 INFO L124 PetriNetUnfolderBase]: 16/46 cut-off events. [2023-08-26 18:41:33,034 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:41:33,035 INFO L83 FinitePrefix]: Finished finitePrefix Result has 107 conditions, 46 events. 16/46 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 87 event pairs, 0 based on Foata normal form. 9/55 useless extension candidates. Maximal degree in co-relation 99. Up to 34 conditions per place. [2023-08-26 18:41:33,035 INFO L140 encePairwiseOnDemand]: 213/217 looper letters, 0 selfloop transitions, 0 changer transitions 22/22 dead transitions. [2023-08-26 18:41:33,035 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 21 places, 22 transitions, 92 flow [2023-08-26 18:41:33,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:41:33,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:41:33,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 343 transitions. [2023-08-26 18:41:33,038 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3951612903225806 [2023-08-26 18:41:33,038 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 343 transitions. [2023-08-26 18:41:33,038 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 343 transitions. [2023-08-26 18:41:33,038 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:33,038 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 343 transitions. [2023-08-26 18:41:33,039 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 85.75) internal successors, (343), 4 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 18:41:33,041 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 217.0) internal successors, (1085), 5 states have internal predecessors, (1085), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:33,042 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 217.0) internal successors, (1085), 5 states have internal predecessors, (1085), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:33,042 INFO L175 Difference]: Start difference. First operand has 28 places, 24 transitions, 60 flow. Second operand 4 states and 343 transitions. [2023-08-26 18:41:33,042 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 21 places, 22 transitions, 92 flow [2023-08-26 18:41:33,042 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 19 places, 22 transitions, 89 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:41:33,043 INFO L231 Difference]: Finished difference. Result has 19 places, 0 transitions, 0 flow [2023-08-26 18:41:33,043 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=217, PETRI_DIFFERENCE_MINUEND_FLOW=29, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=13, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=19, PETRI_TRANSITIONS=0} [2023-08-26 18:41:33,043 INFO L281 CegarLoopForPetriNet]: 31 programPoint places, -12 predicate places. [2023-08-26 18:41:33,044 INFO L495 AbstractCegarLoop]: Abstraction has has 19 places, 0 transitions, 0 flow [2023-08-26 18:41:33,044 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 81.875) internal successors, (655), 8 states have internal predecessors, (655), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:33,046 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:41:33,046 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:41:33,047 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:41:33,047 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:41:33,047 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:41:33,055 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-08-26 18:41:33,252 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:33,253 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-26 18:41:33,254 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:41:33,257 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 106 places, 116 transitions, 240 flow [2023-08-26 18:41:33,269 INFO L124 PetriNetUnfolderBase]: 19/159 cut-off events. [2023-08-26 18:41:33,269 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:41:33,270 INFO L83 FinitePrefix]: Finished finitePrefix Result has 165 conditions, 159 events. 19/159 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 392 event pairs, 0 based on Foata normal form. 0/127 useless extension candidates. Maximal degree in co-relation 76. Up to 4 conditions per place. [2023-08-26 18:41:33,270 INFO L82 GeneralOperation]: Start removeDead. Operand has 106 places, 116 transitions, 240 flow [2023-08-26 18:41:33,271 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 102 places, 111 transitions, 227 flow [2023-08-26 18:41:33,271 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:33,271 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 102 places, 111 transitions, 227 flow [2023-08-26 18:41:33,272 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 102 places, 111 transitions, 227 flow [2023-08-26 18:41:33,272 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 102 places, 111 transitions, 227 flow [2023-08-26 18:41:33,282 INFO L124 PetriNetUnfolderBase]: 18/154 cut-off events. [2023-08-26 18:41:33,282 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:41:33,283 INFO L83 FinitePrefix]: Finished finitePrefix Result has 159 conditions, 154 events. 18/154 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 375 event pairs, 0 based on Foata normal form. 0/122 useless extension candidates. Maximal degree in co-relation 76. Up to 4 conditions per place. [2023-08-26 18:41:33,284 INFO L119 LiptonReduction]: Number of co-enabled transitions 2744 [2023-08-26 18:41:35,816 INFO L134 LiptonReduction]: Checked pairs total: 4925 [2023-08-26 18:41:35,817 INFO L136 LiptonReduction]: Total number of compositions: 98 [2023-08-26 18:41:35,819 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:41:35,824 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;@58c2a9ea, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:41:35,825 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:41:35,828 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:41:35,828 INFO L124 PetriNetUnfolderBase]: 4/30 cut-off events. [2023-08-26 18:41:35,828 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:41:35,828 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:35,828 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 18:41:35,828 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:41:35,829 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:35,829 INFO L85 PathProgramCache]: Analyzing trace with hash -1022161646, now seen corresponding path program 1 times [2023-08-26 18:41:35,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:35,829 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935747161] [2023-08-26 18:41:35,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:35,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:35,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:41:35,847 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:41:35,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:41:35,882 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:41:35,882 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:41:35,882 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:41:35,882 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 18:41:35,883 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:41:35,883 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:41:35,884 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:41:35,884 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 18:41:35,908 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 18:41:35,913 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 146 transitions, 310 flow [2023-08-26 18:41:35,937 INFO L124 PetriNetUnfolderBase]: 34/259 cut-off events. [2023-08-26 18:41:35,937 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:41:35,938 INFO L83 FinitePrefix]: Finished finitePrefix Result has 273 conditions, 259 events. 34/259 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 778 event pairs, 0 based on Foata normal form. 0/204 useless extension candidates. Maximal degree in co-relation 161. Up to 8 conditions per place. [2023-08-26 18:41:35,938 INFO L82 GeneralOperation]: Start removeDead. Operand has 131 places, 146 transitions, 310 flow [2023-08-26 18:41:35,940 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 131 places, 146 transitions, 310 flow [2023-08-26 18:41:35,940 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:35,940 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 131 places, 146 transitions, 310 flow [2023-08-26 18:41:35,940 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 131 places, 146 transitions, 310 flow [2023-08-26 18:41:35,940 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 146 transitions, 310 flow [2023-08-26 18:41:35,968 INFO L124 PetriNetUnfolderBase]: 34/259 cut-off events. [2023-08-26 18:41:35,971 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:41:35,972 INFO L83 FinitePrefix]: Finished finitePrefix Result has 273 conditions, 259 events. 34/259 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 778 event pairs, 0 based on Foata normal form. 0/204 useless extension candidates. Maximal degree in co-relation 161. Up to 8 conditions per place. [2023-08-26 18:41:35,977 INFO L119 LiptonReduction]: Number of co-enabled transitions 7672 [2023-08-26 18:41:38,656 INFO L134 LiptonReduction]: Checked pairs total: 18092 [2023-08-26 18:41:38,656 INFO L136 LiptonReduction]: Total number of compositions: 110 [2023-08-26 18:41:38,658 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:41:38,659 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;@58c2a9ea, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:41:38,659 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:41:38,661 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:41:38,661 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:41:38,661 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:41:38,661 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:38,661 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:38,661 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:38,662 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:38,662 INFO L85 PathProgramCache]: Analyzing trace with hash 26637, now seen corresponding path program 1 times [2023-08-26 18:41:38,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:38,662 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968853581] [2023-08-26 18:41:38,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:38,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:38,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:38,697 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 18:41:38,701 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:38,701 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968853581] [2023-08-26 18:41:38,701 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968853581] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:38,701 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:38,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:38,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196394939] [2023-08-26 18:41:38,702 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:38,702 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:38,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:38,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:38,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:38,704 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 107 out of 256 [2023-08-26 18:41:38,704 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 50 places, 63 transitions, 144 flow. Second operand has 3 states, 3 states have (on average 107.66666666666667) internal successors, (323), 3 states have internal predecessors, (323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:38,704 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:38,704 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 107 of 256 [2023-08-26 18:41:38,705 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:38,988 INFO L124 PetriNetUnfolderBase]: 1617/2993 cut-off events. [2023-08-26 18:41:38,989 INFO L125 PetriNetUnfolderBase]: For 47/47 co-relation queries the response was YES. [2023-08-26 18:41:38,992 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5709 conditions, 2993 events. 1617/2993 cut-off events. For 47/47 co-relation queries the response was YES. Maximal size of possible extension queue 126. Compared 18836 event pairs, 1484 based on Foata normal form. 659/3170 useless extension candidates. Maximal degree in co-relation 2920. Up to 2459 conditions per place. [2023-08-26 18:41:39,003 INFO L140 encePairwiseOnDemand]: 236/256 looper letters, 30 selfloop transitions, 1 changer transitions 17/58 dead transitions. [2023-08-26 18:41:39,003 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 58 transitions, 228 flow [2023-08-26 18:41:39,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:39,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:39,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 398 transitions. [2023-08-26 18:41:39,005 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5182291666666666 [2023-08-26 18:41:39,005 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 398 transitions. [2023-08-26 18:41:39,005 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 398 transitions. [2023-08-26 18:41:39,006 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:39,006 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 398 transitions. [2023-08-26 18:41:39,007 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 132.66666666666666) internal successors, (398), 3 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,008 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 256.0) internal successors, (1024), 4 states have internal predecessors, (1024), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,009 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 256.0) internal successors, (1024), 4 states have internal predecessors, (1024), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,009 INFO L175 Difference]: Start difference. First operand has 50 places, 63 transitions, 144 flow. Second operand 3 states and 398 transitions. [2023-08-26 18:41:39,009 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 58 transitions, 228 flow [2023-08-26 18:41:39,011 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 49 places, 58 transitions, 228 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:41:39,012 INFO L231 Difference]: Finished difference. Result has 49 places, 41 transitions, 98 flow [2023-08-26 18:41:39,012 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=256, PETRI_DIFFERENCE_MINUEND_FLOW=106, PETRI_DIFFERENCE_MINUEND_PLACES=47, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=44, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=43, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=98, PETRI_PLACES=49, PETRI_TRANSITIONS=41} [2023-08-26 18:41:39,015 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, -1 predicate places. [2023-08-26 18:41:39,015 INFO L495 AbstractCegarLoop]: Abstraction has has 49 places, 41 transitions, 98 flow [2023-08-26 18:41:39,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 107.66666666666667) internal successors, (323), 3 states have internal predecessors, (323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,016 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:39,016 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:39,016 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 18:41:39,016 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:39,016 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:39,016 INFO L85 PathProgramCache]: Analyzing trace with hash 26635, now seen corresponding path program 1 times [2023-08-26 18:41:39,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:39,017 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838305211] [2023-08-26 18:41:39,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:39,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:39,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:39,090 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 18:41:39,091 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:39,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838305211] [2023-08-26 18:41:39,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [838305211] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:39,091 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:39,091 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:39,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420208613] [2023-08-26 18:41:39,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:39,091 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:39,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:39,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:39,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:39,093 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 102 out of 256 [2023-08-26 18:41:39,094 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 41 transitions, 98 flow. Second operand has 3 states, 3 states have (on average 102.66666666666667) internal successors, (308), 3 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,094 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:39,094 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 102 of 256 [2023-08-26 18:41:39,094 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:39,285 INFO L124 PetriNetUnfolderBase]: 1376/2463 cut-off events. [2023-08-26 18:41:39,285 INFO L125 PetriNetUnfolderBase]: For 37/37 co-relation queries the response was YES. [2023-08-26 18:41:39,288 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4775 conditions, 2463 events. 1376/2463 cut-off events. For 37/37 co-relation queries the response was YES. Maximal size of possible extension queue 113. Compared 14804 event pairs, 648 based on Foata normal form. 0/2151 useless extension candidates. Maximal degree in co-relation 4767. Up to 2257 conditions per place. [2023-08-26 18:41:39,296 INFO L140 encePairwiseOnDemand]: 252/256 looper letters, 37 selfloop transitions, 2 changer transitions 0/49 dead transitions. [2023-08-26 18:41:39,296 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 48 places, 49 transitions, 192 flow [2023-08-26 18:41:39,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:39,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:39,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 347 transitions. [2023-08-26 18:41:39,298 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4518229166666667 [2023-08-26 18:41:39,298 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 347 transitions. [2023-08-26 18:41:39,298 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 347 transitions. [2023-08-26 18:41:39,298 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:39,298 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 347 transitions. [2023-08-26 18:41:39,299 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 115.66666666666667) internal successors, (347), 3 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,301 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 256.0) internal successors, (1024), 4 states have internal predecessors, (1024), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,301 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 256.0) internal successors, (1024), 4 states have internal predecessors, (1024), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,301 INFO L175 Difference]: Start difference. First operand has 49 places, 41 transitions, 98 flow. Second operand 3 states and 347 transitions. [2023-08-26 18:41:39,301 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 48 places, 49 transitions, 192 flow [2023-08-26 18:41:39,305 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 46 places, 49 transitions, 189 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:41:39,306 INFO L231 Difference]: Finished difference. Result has 47 places, 42 transitions, 109 flow [2023-08-26 18:41:39,306 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=256, PETRI_DIFFERENCE_MINUEND_FLOW=95, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=109, PETRI_PLACES=47, PETRI_TRANSITIONS=42} [2023-08-26 18:41:39,307 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, -3 predicate places. [2023-08-26 18:41:39,307 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 42 transitions, 109 flow [2023-08-26 18:41:39,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 102.66666666666667) internal successors, (308), 3 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,308 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:39,308 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:41:39,308 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 18:41:39,308 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:39,308 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:39,309 INFO L85 PathProgramCache]: Analyzing trace with hash -1149749222, now seen corresponding path program 1 times [2023-08-26 18:41:39,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:39,309 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698408256] [2023-08-26 18:41:39,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:39,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:39,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:39,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:39,409 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:39,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698408256] [2023-08-26 18:41:39,413 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1698408256] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:41:39,413 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [440048090] [2023-08-26 18:41:39,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:39,413 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:39,413 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:41:39,417 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:41:39,417 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-26 18:41:39,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:39,504 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:41:39,505 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:41:39,514 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:41:39,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:39,554 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:41:39,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:39,595 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [440048090] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:41:39,596 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:41:39,596 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:41:39,596 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249800463] [2023-08-26 18:41:39,596 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:41:39,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:41:39,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:39,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:41:39,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:41:39,598 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 102 out of 256 [2023-08-26 18:41:39,599 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 47 places, 42 transitions, 109 flow. Second operand has 8 states, 8 states have (on average 103.875) internal successors, (831), 8 states have internal predecessors, (831), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,599 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:39,599 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 102 of 256 [2023-08-26 18:41:39,599 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:39,736 INFO L124 PetriNetUnfolderBase]: 286/533 cut-off events. [2023-08-26 18:41:39,736 INFO L125 PetriNetUnfolderBase]: For 88/88 co-relation queries the response was YES. [2023-08-26 18:41:39,737 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1132 conditions, 533 events. 286/533 cut-off events. For 88/88 co-relation queries the response was YES. Maximal size of possible extension queue 31. Compared 2479 event pairs, 50 based on Foata normal form. 70/599 useless extension candidates. Maximal degree in co-relation 1122. Up to 346 conditions per place. [2023-08-26 18:41:39,737 INFO L140 encePairwiseOnDemand]: 252/256 looper letters, 0 selfloop transitions, 0 changer transitions 51/51 dead transitions. [2023-08-26 18:41:39,737 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 51 transitions, 202 flow [2023-08-26 18:41:39,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 18:41:39,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 18:41:39,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 556 transitions. [2023-08-26 18:41:39,739 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.434375 [2023-08-26 18:41:39,739 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 556 transitions. [2023-08-26 18:41:39,739 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 556 transitions. [2023-08-26 18:41:39,740 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:39,740 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 556 transitions. [2023-08-26 18:41:39,741 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 111.2) internal successors, (556), 5 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,743 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 256.0) internal successors, (1536), 6 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,743 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 256.0) internal successors, (1536), 6 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,743 INFO L175 Difference]: Start difference. First operand has 47 places, 42 transitions, 109 flow. Second operand 5 states and 556 transitions. [2023-08-26 18:41:39,743 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 51 transitions, 202 flow [2023-08-26 18:41:39,744 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 51 transitions, 200 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:41:39,744 INFO L231 Difference]: Finished difference. Result has 39 places, 0 transitions, 0 flow [2023-08-26 18:41:39,745 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=256, PETRI_DIFFERENCE_MINUEND_FLOW=72, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=39, PETRI_TRANSITIONS=0} [2023-08-26 18:41:39,745 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, -11 predicate places. [2023-08-26 18:41:39,745 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 0 transitions, 0 flow [2023-08-26 18:41:39,746 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 103.875) internal successors, (831), 8 states have internal predecessors, (831), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:39,746 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:41:39,746 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:41:39,746 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:41:39,746 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:41:39,746 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:41:39,753 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-08-26 18:41:39,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-08-26 18:41:39,951 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-26 18:41:39,951 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:41:39,953 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 146 transitions, 310 flow [2023-08-26 18:41:39,970 INFO L124 PetriNetUnfolderBase]: 34/259 cut-off events. [2023-08-26 18:41:39,970 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:41:39,971 INFO L83 FinitePrefix]: Finished finitePrefix Result has 273 conditions, 259 events. 34/259 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 778 event pairs, 0 based on Foata normal form. 0/204 useless extension candidates. Maximal degree in co-relation 161. Up to 8 conditions per place. [2023-08-26 18:41:39,971 INFO L82 GeneralOperation]: Start removeDead. Operand has 131 places, 146 transitions, 310 flow [2023-08-26 18:41:39,973 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 131 places, 146 transitions, 310 flow [2023-08-26 18:41:39,973 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:39,973 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 131 places, 146 transitions, 310 flow [2023-08-26 18:41:39,973 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 131 places, 146 transitions, 310 flow [2023-08-26 18:41:39,973 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 146 transitions, 310 flow [2023-08-26 18:41:40,008 INFO L124 PetriNetUnfolderBase]: 34/259 cut-off events. [2023-08-26 18:41:40,009 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:41:40,010 INFO L83 FinitePrefix]: Finished finitePrefix Result has 273 conditions, 259 events. 34/259 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 778 event pairs, 0 based on Foata normal form. 0/204 useless extension candidates. Maximal degree in co-relation 161. Up to 8 conditions per place. [2023-08-26 18:41:40,014 INFO L119 LiptonReduction]: Number of co-enabled transitions 7672 [2023-08-26 18:41:42,483 INFO L134 LiptonReduction]: Checked pairs total: 18210 [2023-08-26 18:41:42,483 INFO L136 LiptonReduction]: Total number of compositions: 110 [2023-08-26 18:41:42,485 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:41:42,485 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;@58c2a9ea, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:41:42,485 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:41:42,490 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:41:42,490 INFO L124 PetriNetUnfolderBase]: 14/71 cut-off events. [2023-08-26 18:41:42,490 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 18:41:42,490 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:42,490 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 18:41:42,490 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:41:42,490 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:42,490 INFO L85 PathProgramCache]: Analyzing trace with hash -970019987, now seen corresponding path program 1 times [2023-08-26 18:41:42,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:42,491 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22506558] [2023-08-26 18:41:42,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:42,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:42,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:41:42,504 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:41:42,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:41:42,515 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:41:42,515 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:41:42,515 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:41:42,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 18:41:42,516 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:41:42,516 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:41:42,516 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:41:42,516 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 18:41:42,531 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 18:41:42,532 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 156 places, 176 transitions, 382 flow [2023-08-26 18:41:42,561 INFO L124 PetriNetUnfolderBase]: 54/396 cut-off events. [2023-08-26 18:41:42,561 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:41:42,563 INFO L83 FinitePrefix]: Finished finitePrefix Result has 424 conditions, 396 events. 54/396 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1364 event pairs, 1 based on Foata normal form. 0/310 useless extension candidates. Maximal degree in co-relation 267. Up to 16 conditions per place. [2023-08-26 18:41:42,563 INFO L82 GeneralOperation]: Start removeDead. Operand has 156 places, 176 transitions, 382 flow [2023-08-26 18:41:42,566 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 156 places, 176 transitions, 382 flow [2023-08-26 18:41:42,566 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:42,566 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 156 places, 176 transitions, 382 flow [2023-08-26 18:41:42,566 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 156 places, 176 transitions, 382 flow [2023-08-26 18:41:42,566 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 156 places, 176 transitions, 382 flow [2023-08-26 18:41:42,594 INFO L124 PetriNetUnfolderBase]: 54/396 cut-off events. [2023-08-26 18:41:42,594 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:41:42,596 INFO L83 FinitePrefix]: Finished finitePrefix Result has 424 conditions, 396 events. 54/396 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1364 event pairs, 1 based on Foata normal form. 0/310 useless extension candidates. Maximal degree in co-relation 267. Up to 16 conditions per place. [2023-08-26 18:41:42,606 INFO L119 LiptonReduction]: Number of co-enabled transitions 14112 [2023-08-26 18:41:45,285 INFO L134 LiptonReduction]: Checked pairs total: 36944 [2023-08-26 18:41:45,285 INFO L136 LiptonReduction]: Total number of compositions: 125 [2023-08-26 18:41:45,287 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:41:45,287 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;@58c2a9ea, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:41:45,287 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:41:45,288 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:41:45,288 INFO L124 PetriNetUnfolderBase]: 0/3 cut-off events. [2023-08-26 18:41:45,288 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:41:45,288 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:45,289 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:45,289 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:45,289 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:45,289 INFO L85 PathProgramCache]: Analyzing trace with hash 40732, now seen corresponding path program 1 times [2023-08-26 18:41:45,289 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:45,289 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432108106] [2023-08-26 18:41:45,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:45,289 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:45,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:45,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:45,309 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:45,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432108106] [2023-08-26 18:41:45,309 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432108106] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:45,309 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:45,309 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:45,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296145320] [2023-08-26 18:41:45,309 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:45,310 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:45,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:45,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:45,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:45,310 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 129 out of 301 [2023-08-26 18:41:45,311 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 82 transitions, 194 flow. Second operand has 3 states, 3 states have (on average 129.66666666666666) internal successors, (389), 3 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:45,311 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:45,311 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 129 of 301 [2023-08-26 18:41:45,311 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:48,362 INFO L124 PetriNetUnfolderBase]: 28312/42119 cut-off events. [2023-08-26 18:41:48,362 INFO L125 PetriNetUnfolderBase]: For 1039/1039 co-relation queries the response was YES. [2023-08-26 18:41:48,416 INFO L83 FinitePrefix]: Finished finitePrefix Result has 82802 conditions, 42119 events. 28312/42119 cut-off events. For 1039/1039 co-relation queries the response was YES. Maximal size of possible extension queue 1176. Compared 296044 event pairs, 25801 based on Foata normal form. 9264/45694 useless extension candidates. Maximal degree in co-relation 19461. Up to 36562 conditions per place. [2023-08-26 18:41:48,544 INFO L140 encePairwiseOnDemand]: 275/301 looper letters, 41 selfloop transitions, 1 changer transitions 27/81 dead transitions. [2023-08-26 18:41:48,544 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 81 transitions, 328 flow [2023-08-26 18:41:48,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:48,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:48,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 497 transitions. [2023-08-26 18:41:48,546 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5503875968992248 [2023-08-26 18:41:48,546 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 497 transitions. [2023-08-26 18:41:48,546 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 497 transitions. [2023-08-26 18:41:48,546 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:48,547 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 497 transitions. [2023-08-26 18:41:48,548 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 165.66666666666666) internal successors, (497), 3 states have internal predecessors, (497), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:48,549 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 301.0) internal successors, (1204), 4 states have internal predecessors, (1204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:48,549 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 301.0) internal successors, (1204), 4 states have internal predecessors, (1204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:48,549 INFO L175 Difference]: Start difference. First operand has 64 places, 82 transitions, 194 flow. Second operand 3 states and 497 transitions. [2023-08-26 18:41:48,549 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 81 transitions, 328 flow [2023-08-26 18:41:48,553 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 63 places, 81 transitions, 328 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:41:48,554 INFO L231 Difference]: Finished difference. Result has 63 places, 54 transitions, 134 flow [2023-08-26 18:41:48,554 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=301, PETRI_DIFFERENCE_MINUEND_FLOW=144, PETRI_DIFFERENCE_MINUEND_PLACES=61, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=57, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=56, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=134, PETRI_PLACES=63, PETRI_TRANSITIONS=54} [2023-08-26 18:41:48,554 INFO L281 CegarLoopForPetriNet]: 64 programPoint places, -1 predicate places. [2023-08-26 18:41:48,554 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 54 transitions, 134 flow [2023-08-26 18:41:48,555 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 129.66666666666666) internal successors, (389), 3 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:48,555 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:48,555 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:41:48,555 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 18:41:48,555 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:48,555 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:48,556 INFO L85 PathProgramCache]: Analyzing trace with hash 40734, now seen corresponding path program 1 times [2023-08-26 18:41:48,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:48,556 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687761095] [2023-08-26 18:41:48,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:48,556 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:48,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:48,596 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:48,597 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:48,597 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687761095] [2023-08-26 18:41:48,597 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [687761095] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:48,597 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:48,597 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:48,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901215277] [2023-08-26 18:41:48,597 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:48,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:48,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:48,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:48,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:48,598 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 124 out of 301 [2023-08-26 18:41:48,599 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 54 transitions, 134 flow. Second operand has 3 states, 3 states have (on average 124.66666666666667) internal successors, (374), 3 states have internal predecessors, (374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:48,599 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:48,599 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 124 of 301 [2023-08-26 18:41:48,599 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:50,435 INFO L124 PetriNetUnfolderBase]: 23815/35904 cut-off events. [2023-08-26 18:41:50,435 INFO L125 PetriNetUnfolderBase]: For 990/990 co-relation queries the response was YES. [2023-08-26 18:41:50,471 INFO L83 FinitePrefix]: Finished finitePrefix Result has 70204 conditions, 35904 events. 23815/35904 cut-off events. For 990/990 co-relation queries the response was YES. Maximal size of possible extension queue 1017. Compared 250346 event pairs, 15337 based on Foata normal form. 0/32122 useless extension candidates. Maximal degree in co-relation 70195. Up to 33630 conditions per place. [2023-08-26 18:41:50,580 INFO L140 encePairwiseOnDemand]: 297/301 looper letters, 50 selfloop transitions, 2 changer transitions 0/64 dead transitions. [2023-08-26 18:41:50,580 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 62 places, 64 transitions, 258 flow [2023-08-26 18:41:50,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:50,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:50,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 426 transitions. [2023-08-26 18:41:50,582 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4717607973421927 [2023-08-26 18:41:50,582 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 426 transitions. [2023-08-26 18:41:50,582 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 426 transitions. [2023-08-26 18:41:50,582 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:50,582 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 426 transitions. [2023-08-26 18:41:50,583 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 142.0) internal successors, (426), 3 states have internal predecessors, (426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:50,584 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 301.0) internal successors, (1204), 4 states have internal predecessors, (1204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:50,585 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 301.0) internal successors, (1204), 4 states have internal predecessors, (1204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:50,585 INFO L175 Difference]: Start difference. First operand has 63 places, 54 transitions, 134 flow. Second operand 3 states and 426 transitions. [2023-08-26 18:41:50,585 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 62 places, 64 transitions, 258 flow [2023-08-26 18:41:50,593 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 60 places, 64 transitions, 255 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:41:50,594 INFO L231 Difference]: Finished difference. Result has 61 places, 55 transitions, 145 flow [2023-08-26 18:41:50,594 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=301, PETRI_DIFFERENCE_MINUEND_FLOW=131, PETRI_DIFFERENCE_MINUEND_PLACES=58, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=54, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=52, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=145, PETRI_PLACES=61, PETRI_TRANSITIONS=55} [2023-08-26 18:41:50,596 INFO L281 CegarLoopForPetriNet]: 64 programPoint places, -3 predicate places. [2023-08-26 18:41:50,596 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 55 transitions, 145 flow [2023-08-26 18:41:50,597 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 124.66666666666667) internal successors, (374), 3 states have internal predecessors, (374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:50,597 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:50,597 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:41:50,597 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 18:41:50,597 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:50,597 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:50,597 INFO L85 PathProgramCache]: Analyzing trace with hash -1002749193, now seen corresponding path program 1 times [2023-08-26 18:41:50,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:50,598 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795722230] [2023-08-26 18:41:50,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:50,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:50,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:50,682 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:50,683 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:50,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795722230] [2023-08-26 18:41:50,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [795722230] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:41:50,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719407001] [2023-08-26 18:41:50,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:50,684 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:50,684 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:41:50,685 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:41:50,688 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-08-26 18:41:50,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:50,752 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:41:50,754 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:41:50,765 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:41:50,795 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:50,796 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:41:50,829 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:50,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719407001] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:41:50,829 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:41:50,829 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-08-26 18:41:50,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332349349] [2023-08-26 18:41:50,829 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:41:50,830 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 18:41:50,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:50,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 18:41:50,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-08-26 18:41:50,831 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 124 out of 301 [2023-08-26 18:41:50,832 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 55 transitions, 145 flow. Second operand has 7 states, 7 states have (on average 125.71428571428571) internal successors, (880), 7 states have internal predecessors, (880), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:50,832 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:50,832 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 124 of 301 [2023-08-26 18:41:50,832 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:52,728 INFO L124 PetriNetUnfolderBase]: 21678/31598 cut-off events. [2023-08-26 18:41:52,728 INFO L125 PetriNetUnfolderBase]: For 1612/1612 co-relation queries the response was YES. [2023-08-26 18:41:52,775 INFO L83 FinitePrefix]: Finished finitePrefix Result has 64465 conditions, 31598 events. 21678/31598 cut-off events. For 1612/1612 co-relation queries the response was YES. Maximal size of possible extension queue 901. Compared 211480 event pairs, 2996 based on Foata normal form. 9/29778 useless extension candidates. Maximal degree in co-relation 64454. Up to 22630 conditions per place. [2023-08-26 18:41:52,868 INFO L140 encePairwiseOnDemand]: 297/301 looper letters, 112 selfloop transitions, 6 changer transitions 1/131 dead transitions. [2023-08-26 18:41:52,868 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 131 transitions, 537 flow [2023-08-26 18:41:52,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:41:52,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:41:52,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 867 transitions. [2023-08-26 18:41:52,874 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48006644518272423 [2023-08-26 18:41:52,874 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 867 transitions. [2023-08-26 18:41:52,874 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 867 transitions. [2023-08-26 18:41:52,874 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:52,874 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 867 transitions. [2023-08-26 18:41:52,876 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 144.5) internal successors, (867), 6 states have internal predecessors, (867), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:52,879 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 301.0) internal successors, (2107), 7 states have internal predecessors, (2107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:52,880 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 301.0) internal successors, (2107), 7 states have internal predecessors, (2107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:52,880 INFO L175 Difference]: Start difference. First operand has 61 places, 55 transitions, 145 flow. Second operand 6 states and 867 transitions. [2023-08-26 18:41:52,880 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 131 transitions, 537 flow [2023-08-26 18:41:52,883 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 64 places, 131 transitions, 535 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:41:52,885 INFO L231 Difference]: Finished difference. Result has 64 places, 56 transitions, 159 flow [2023-08-26 18:41:52,885 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=301, PETRI_DIFFERENCE_MINUEND_FLOW=139, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=54, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=50, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=159, PETRI_PLACES=64, PETRI_TRANSITIONS=56} [2023-08-26 18:41:52,886 INFO L281 CegarLoopForPetriNet]: 64 programPoint places, 0 predicate places. [2023-08-26 18:41:52,886 INFO L495 AbstractCegarLoop]: Abstraction has has 64 places, 56 transitions, 159 flow [2023-08-26 18:41:52,887 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 125.71428571428571) internal successors, (880), 7 states have internal predecessors, (880), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:52,887 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:52,887 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 18:41:52,894 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-08-26 18:41:53,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:53,091 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:53,092 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:53,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1137226425, now seen corresponding path program 1 times [2023-08-26 18:41:53,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:53,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1605228451] [2023-08-26 18:41:53,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:53,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:53,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:53,163 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 18:41:53,164 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:53,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1605228451] [2023-08-26 18:41:53,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1605228451] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:53,164 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:53,164 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:41:53,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877601302] [2023-08-26 18:41:53,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:53,165 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:41:53,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:53,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:41:53,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:41:53,166 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 131 out of 301 [2023-08-26 18:41:53,167 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 56 transitions, 159 flow. Second operand has 3 states, 3 states have (on average 133.66666666666666) internal successors, (401), 3 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:53,167 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:53,167 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 131 of 301 [2023-08-26 18:41:53,167 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:56,011 INFO L124 PetriNetUnfolderBase]: 37232/55826 cut-off events. [2023-08-26 18:41:56,012 INFO L125 PetriNetUnfolderBase]: For 7243/7243 co-relation queries the response was YES. [2023-08-26 18:41:56,087 INFO L83 FinitePrefix]: Finished finitePrefix Result has 113666 conditions, 55826 events. 37232/55826 cut-off events. For 7243/7243 co-relation queries the response was YES. Maximal size of possible extension queue 1479. Compared 407977 event pairs, 14119 based on Foata normal form. 0/52468 useless extension candidates. Maximal degree in co-relation 113654. Up to 37987 conditions per place. [2023-08-26 18:41:56,205 INFO L140 encePairwiseOnDemand]: 292/301 looper letters, 81 selfloop transitions, 8 changer transitions 0/99 dead transitions. [2023-08-26 18:41:56,205 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 66 places, 99 transitions, 462 flow [2023-08-26 18:41:56,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:41:56,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:41:56,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 477 transitions. [2023-08-26 18:41:56,206 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5282392026578073 [2023-08-26 18:41:56,206 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 477 transitions. [2023-08-26 18:41:56,206 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 477 transitions. [2023-08-26 18:41:56,207 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:56,207 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 477 transitions. [2023-08-26 18:41:56,208 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 159.0) internal successors, (477), 3 states have internal predecessors, (477), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:56,209 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 301.0) internal successors, (1204), 4 states have internal predecessors, (1204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:56,209 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 301.0) internal successors, (1204), 4 states have internal predecessors, (1204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:56,209 INFO L175 Difference]: Start difference. First operand has 64 places, 56 transitions, 159 flow. Second operand 3 states and 477 transitions. [2023-08-26 18:41:56,210 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 66 places, 99 transitions, 462 flow [2023-08-26 18:41:56,215 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 63 places, 99 transitions, 435 flow, removed 8 selfloop flow, removed 3 redundant places. [2023-08-26 18:41:56,217 INFO L231 Difference]: Finished difference. Result has 65 places, 63 transitions, 206 flow [2023-08-26 18:41:56,217 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=301, PETRI_DIFFERENCE_MINUEND_FLOW=144, PETRI_DIFFERENCE_MINUEND_PLACES=61, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=48, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=206, PETRI_PLACES=65, PETRI_TRANSITIONS=63} [2023-08-26 18:41:56,217 INFO L281 CegarLoopForPetriNet]: 64 programPoint places, 1 predicate places. [2023-08-26 18:41:56,217 INFO L495 AbstractCegarLoop]: Abstraction has has 65 places, 63 transitions, 206 flow [2023-08-26 18:41:56,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 133.66666666666666) internal successors, (401), 3 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:56,218 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:56,218 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:41:56,218 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 18:41:56,218 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:56,218 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:56,218 INFO L85 PathProgramCache]: Analyzing trace with hash 410585572, now seen corresponding path program 1 times [2023-08-26 18:41:56,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:56,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582559763] [2023-08-26 18:41:56,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:56,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:56,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:56,298 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 18:41:56,298 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:56,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582559763] [2023-08-26 18:41:56,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1582559763] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:41:56,298 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:41:56,299 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:41:56,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432676160] [2023-08-26 18:41:56,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:41:56,300 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:41:56,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:56,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:41:56,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:41:56,301 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 124 out of 301 [2023-08-26 18:41:56,302 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 65 places, 63 transitions, 206 flow. Second operand has 4 states, 4 states have (on average 126.5) internal successors, (506), 4 states have internal predecessors, (506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:56,302 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:56,302 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 124 of 301 [2023-08-26 18:41:56,302 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:58,694 INFO L124 PetriNetUnfolderBase]: 26956/40761 cut-off events. [2023-08-26 18:41:58,694 INFO L125 PetriNetUnfolderBase]: For 13414/13435 co-relation queries the response was YES. [2023-08-26 18:41:58,743 INFO L83 FinitePrefix]: Finished finitePrefix Result has 92874 conditions, 40761 events. 26956/40761 cut-off events. For 13414/13435 co-relation queries the response was YES. Maximal size of possible extension queue 1107. Compared 290650 event pairs, 16236 based on Foata normal form. 0/40023 useless extension candidates. Maximal degree in co-relation 92861. Up to 26025 conditions per place. [2023-08-26 18:41:58,827 INFO L140 encePairwiseOnDemand]: 297/301 looper letters, 83 selfloop transitions, 3 changer transitions 0/98 dead transitions. [2023-08-26 18:41:58,827 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 68 places, 98 transitions, 492 flow [2023-08-26 18:41:58,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:41:58,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:41:58,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 567 transitions. [2023-08-26 18:41:58,829 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47093023255813954 [2023-08-26 18:41:58,829 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 567 transitions. [2023-08-26 18:41:58,829 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 567 transitions. [2023-08-26 18:41:58,830 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:58,830 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 567 transitions. [2023-08-26 18:41:58,831 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 141.75) internal successors, (567), 4 states have internal predecessors, (567), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:58,832 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 301.0) internal successors, (1505), 5 states have internal predecessors, (1505), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:58,833 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 301.0) internal successors, (1505), 5 states have internal predecessors, (1505), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:58,833 INFO L175 Difference]: Start difference. First operand has 65 places, 63 transitions, 206 flow. Second operand 4 states and 567 transitions. [2023-08-26 18:41:58,833 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 68 places, 98 transitions, 492 flow [2023-08-26 18:41:58,900 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 66 places, 98 transitions, 464 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:41:58,901 INFO L231 Difference]: Finished difference. Result has 67 places, 64 transitions, 204 flow [2023-08-26 18:41:58,901 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=301, PETRI_DIFFERENCE_MINUEND_FLOW=190, PETRI_DIFFERENCE_MINUEND_PLACES=63, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=63, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=60, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=204, PETRI_PLACES=67, PETRI_TRANSITIONS=64} [2023-08-26 18:41:58,902 INFO L281 CegarLoopForPetriNet]: 64 programPoint places, 3 predicate places. [2023-08-26 18:41:58,902 INFO L495 AbstractCegarLoop]: Abstraction has has 67 places, 64 transitions, 204 flow [2023-08-26 18:41:58,902 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 126.5) internal successors, (506), 4 states have internal predecessors, (506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:58,902 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:41:58,903 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:41:58,903 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 18:41:58,903 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:41:58,903 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:41:58,903 INFO L85 PathProgramCache]: Analyzing trace with hash -1211017161, now seen corresponding path program 1 times [2023-08-26 18:41:58,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:41:58,903 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654319916] [2023-08-26 18:41:58,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:58,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:41:58,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:58,948 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:58,949 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:41:58,949 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654319916] [2023-08-26 18:41:58,949 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654319916] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:41:58,949 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145224427] [2023-08-26 18:41:58,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:41:58,949 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:58,949 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:41:58,950 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:41:58,956 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-08-26 18:41:59,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:41:59,033 INFO L262 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:41:59,034 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:41:59,057 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:59,057 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:41:59,094 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:41:59,094 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [145224427] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:41:59,094 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:41:59,094 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-08-26 18:41:59,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366311535] [2023-08-26 18:41:59,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:41:59,095 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-08-26 18:41:59,095 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:41:59,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-08-26 18:41:59,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2023-08-26 18:41:59,097 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 136 out of 301 [2023-08-26 18:41:59,097 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 67 places, 64 transitions, 204 flow. Second operand has 9 states, 9 states have (on average 139.11111111111111) internal successors, (1252), 9 states have internal predecessors, (1252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:59,098 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:41:59,098 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 136 of 301 [2023-08-26 18:41:59,098 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:41:59,642 INFO L124 PetriNetUnfolderBase]: 5560/8245 cut-off events. [2023-08-26 18:41:59,642 INFO L125 PetriNetUnfolderBase]: For 2619/2625 co-relation queries the response was YES. [2023-08-26 18:41:59,649 INFO L83 FinitePrefix]: Finished finitePrefix Result has 18939 conditions, 8245 events. 5560/8245 cut-off events. For 2619/2625 co-relation queries the response was YES. Maximal size of possible extension queue 273. Compared 47283 event pairs, 612 based on Foata normal form. 810/9054 useless extension candidates. Maximal degree in co-relation 18931. Up to 5346 conditions per place. [2023-08-26 18:41:59,653 INFO L140 encePairwiseOnDemand]: 298/301 looper letters, 0 selfloop transitions, 0 changer transitions 101/101 dead transitions. [2023-08-26 18:41:59,654 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 61 places, 101 transitions, 462 flow [2023-08-26 18:41:59,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:41:59,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:41:59,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 901 transitions. [2023-08-26 18:41:59,656 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4988925802879291 [2023-08-26 18:41:59,656 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 901 transitions. [2023-08-26 18:41:59,657 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 901 transitions. [2023-08-26 18:41:59,657 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:41:59,657 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 901 transitions. [2023-08-26 18:41:59,659 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 150.16666666666666) internal successors, (901), 6 states have internal predecessors, (901), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:59,661 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 301.0) internal successors, (2107), 7 states have internal predecessors, (2107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:59,662 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 301.0) internal successors, (2107), 7 states have internal predecessors, (2107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:59,662 INFO L175 Difference]: Start difference. First operand has 67 places, 64 transitions, 204 flow. Second operand 6 states and 901 transitions. [2023-08-26 18:41:59,662 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 61 places, 101 transitions, 462 flow [2023-08-26 18:41:59,663 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 60 places, 101 transitions, 459 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-26 18:41:59,663 INFO L231 Difference]: Finished difference. Result has 60 places, 0 transitions, 0 flow [2023-08-26 18:41:59,664 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=301, PETRI_DIFFERENCE_MINUEND_FLOW=131, PETRI_DIFFERENCE_MINUEND_PLACES=55, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=45, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=45, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=60, PETRI_TRANSITIONS=0} [2023-08-26 18:41:59,664 INFO L281 CegarLoopForPetriNet]: 64 programPoint places, -4 predicate places. [2023-08-26 18:41:59,664 INFO L495 AbstractCegarLoop]: Abstraction has has 60 places, 0 transitions, 0 flow [2023-08-26 18:41:59,665 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 139.11111111111111) internal successors, (1252), 9 states have internal predecessors, (1252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:41:59,665 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:41:59,665 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:41:59,665 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:41:59,665 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:41:59,665 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:41:59,672 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-08-26 18:41:59,871 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:41:59,871 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2023-08-26 18:41:59,872 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:41:59,873 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 156 places, 176 transitions, 382 flow [2023-08-26 18:41:59,903 INFO L124 PetriNetUnfolderBase]: 54/396 cut-off events. [2023-08-26 18:41:59,904 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:41:59,906 INFO L83 FinitePrefix]: Finished finitePrefix Result has 424 conditions, 396 events. 54/396 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1364 event pairs, 1 based on Foata normal form. 0/310 useless extension candidates. Maximal degree in co-relation 267. Up to 16 conditions per place. [2023-08-26 18:41:59,906 INFO L82 GeneralOperation]: Start removeDead. Operand has 156 places, 176 transitions, 382 flow [2023-08-26 18:41:59,907 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 156 places, 176 transitions, 382 flow [2023-08-26 18:41:59,907 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:41:59,907 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 156 places, 176 transitions, 382 flow [2023-08-26 18:41:59,907 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 156 places, 176 transitions, 382 flow [2023-08-26 18:41:59,907 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 156 places, 176 transitions, 382 flow [2023-08-26 18:41:59,935 INFO L124 PetriNetUnfolderBase]: 54/396 cut-off events. [2023-08-26 18:41:59,935 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:41:59,937 INFO L83 FinitePrefix]: Finished finitePrefix Result has 424 conditions, 396 events. 54/396 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1364 event pairs, 1 based on Foata normal form. 0/310 useless extension candidates. Maximal degree in co-relation 267. Up to 16 conditions per place. [2023-08-26 18:41:59,945 INFO L119 LiptonReduction]: Number of co-enabled transitions 14112 [2023-08-26 18:42:02,498 INFO L134 LiptonReduction]: Checked pairs total: 36851 [2023-08-26 18:42:02,498 INFO L136 LiptonReduction]: Total number of compositions: 125 [2023-08-26 18:42:02,499 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:42:02,500 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;@58c2a9ea, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:42:02,500 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:42:02,507 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:42:02,507 INFO L124 PetriNetUnfolderBase]: 27/118 cut-off events. [2023-08-26 18:42:02,507 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 18:42:02,507 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:42:02,507 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 18:42:02,507 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:42:02,507 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:42:02,507 INFO L85 PathProgramCache]: Analyzing trace with hash 1435963424, now seen corresponding path program 1 times [2023-08-26 18:42:02,507 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:42:02,507 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270661983] [2023-08-26 18:42:02,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:42:02,508 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:42:02,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:42:02,519 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:42:02,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:42:02,530 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:42:02,531 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:42:02,531 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:42:02,531 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-26 18:42:02,531 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:42:02,531 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:42:02,531 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:42:02,532 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 18:42:02,556 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 18:42:02,558 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 206 transitions, 456 flow [2023-08-26 18:42:02,611 INFO L124 PetriNetUnfolderBase]: 86/609 cut-off events. [2023-08-26 18:42:02,611 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:42:02,616 INFO L83 FinitePrefix]: Finished finitePrefix Result has 664 conditions, 609 events. 86/609 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2434 event pairs, 6 based on Foata normal form. 0/476 useless extension candidates. Maximal degree in co-relation 416. Up to 32 conditions per place. [2023-08-26 18:42:02,616 INFO L82 GeneralOperation]: Start removeDead. Operand has 181 places, 206 transitions, 456 flow [2023-08-26 18:42:02,622 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 181 places, 206 transitions, 456 flow [2023-08-26 18:42:02,622 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:42:02,622 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 181 places, 206 transitions, 456 flow [2023-08-26 18:42:02,622 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 181 places, 206 transitions, 456 flow [2023-08-26 18:42:02,622 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 206 transitions, 456 flow [2023-08-26 18:42:02,677 INFO L124 PetriNetUnfolderBase]: 86/609 cut-off events. [2023-08-26 18:42:02,677 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:42:02,683 INFO L83 FinitePrefix]: Finished finitePrefix Result has 664 conditions, 609 events. 86/609 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2434 event pairs, 6 based on Foata normal form. 0/476 useless extension candidates. Maximal degree in co-relation 416. Up to 32 conditions per place. [2023-08-26 18:42:02,694 INFO L119 LiptonReduction]: Number of co-enabled transitions 22288 [2023-08-26 18:42:05,491 INFO L134 LiptonReduction]: Checked pairs total: 67702 [2023-08-26 18:42:05,491 INFO L136 LiptonReduction]: Total number of compositions: 142 [2023-08-26 18:42:05,492 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:42:05,493 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;@58c2a9ea, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:42:05,493 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:42:05,494 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:42:05,494 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:42:05,494 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:42:05,494 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:42:05,494 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:42:05,494 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:42:05,494 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:42:05,494 INFO L85 PathProgramCache]: Analyzing trace with hash 56832, now seen corresponding path program 1 times [2023-08-26 18:42:05,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:42:05,495 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178899748] [2023-08-26 18:42:05,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:42:05,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:42:05,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:42:05,528 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:42:05,528 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:42:05,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178899748] [2023-08-26 18:42:05,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [178899748] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:42:05,529 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:42:05,529 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:42:05,529 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742331092] [2023-08-26 18:42:05,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:42:05,529 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:42:05,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:42:05,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:42:05,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:42:05,531 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 146 out of 348 [2023-08-26 18:42:05,531 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 78 places, 101 transitions, 246 flow. Second operand has 3 states, 3 states have (on average 146.66666666666666) internal successors, (440), 3 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:42:05,531 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:42:05,531 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 146 of 348 [2023-08-26 18:42:05,531 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:42:31,083 INFO L124 PetriNetUnfolderBase]: 293864/409030 cut-off events. [2023-08-26 18:42:31,083 INFO L125 PetriNetUnfolderBase]: For 12215/12215 co-relation queries the response was YES. [2023-08-26 18:42:31,774 INFO L83 FinitePrefix]: Finished finitePrefix Result has 800724 conditions, 409030 events. 293864/409030 cut-off events. For 12215/12215 co-relation queries the response was YES. Maximal size of possible extension queue 9251. Compared 3279598 event pairs, 217634 based on Foata normal form. 75100/433322 useless extension candidates. Maximal degree in co-relation 76881. Up to 384909 conditions per place. [2023-08-26 18:42:32,915 INFO L140 encePairwiseOnDemand]: 316/348 looper letters, 59 selfloop transitions, 2 changer transitions 3/82 dead transitions. [2023-08-26 18:42:32,915 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 79 places, 82 transitions, 334 flow [2023-08-26 18:42:32,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:42:32,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:42:32,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 537 transitions. [2023-08-26 18:42:32,917 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.514367816091954 [2023-08-26 18:42:32,917 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 537 transitions. [2023-08-26 18:42:32,917 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 537 transitions. [2023-08-26 18:42:32,917 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:42:32,917 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 537 transitions. [2023-08-26 18:42:32,918 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 179.0) internal successors, (537), 3 states have internal predecessors, (537), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:42:32,920 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 348.0) internal successors, (1392), 4 states have internal predecessors, (1392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:42:32,920 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 348.0) internal successors, (1392), 4 states have internal predecessors, (1392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:42:32,920 INFO L175 Difference]: Start difference. First operand has 78 places, 101 transitions, 246 flow. Second operand 3 states and 537 transitions. [2023-08-26 18:42:32,920 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 79 places, 82 transitions, 334 flow [2023-08-26 18:42:32,922 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 82 transitions, 334 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:42:32,923 INFO L231 Difference]: Finished difference. Result has 80 places, 70 transitions, 188 flow [2023-08-26 18:42:32,923 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=348, PETRI_DIFFERENCE_MINUEND_FLOW=188, PETRI_DIFFERENCE_MINUEND_PLACES=77, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=72, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=70, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=188, PETRI_PLACES=80, PETRI_TRANSITIONS=70} [2023-08-26 18:42:32,924 INFO L281 CegarLoopForPetriNet]: 78 programPoint places, 2 predicate places. [2023-08-26 18:42:32,924 INFO L495 AbstractCegarLoop]: Abstraction has has 80 places, 70 transitions, 188 flow [2023-08-26 18:42:32,924 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 146.66666666666666) internal successors, (440), 3 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:42:32,924 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:42:32,924 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:42:32,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-08-26 18:42:32,924 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:42:32,925 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:42:32,925 INFO L85 PathProgramCache]: Analyzing trace with hash 56831, now seen corresponding path program 1 times [2023-08-26 18:42:32,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:42:32,925 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935782892] [2023-08-26 18:42:32,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:42:32,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:42:32,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:42:32,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:42:32,952 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:42:32,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935782892] [2023-08-26 18:42:32,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935782892] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:42:32,952 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:42:32,952 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:42:32,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694769034] [2023-08-26 18:42:32,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:42:32,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:42:32,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:42:32,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:42:32,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:42:32,954 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 151 out of 348 [2023-08-26 18:42:32,955 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 80 places, 70 transitions, 188 flow. Second operand has 3 states, 3 states have (on average 151.66666666666666) internal successors, (455), 3 states have internal predecessors, (455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:42:32,955 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:42:32,955 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 151 of 348 [2023-08-26 18:42:32,955 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:42:51,033 INFO L124 PetriNetUnfolderBase]: 212870/297164 cut-off events. [2023-08-26 18:42:51,033 INFO L125 PetriNetUnfolderBase]: For 21220/21220 co-relation queries the response was YES. [2023-08-26 18:42:51,642 INFO L83 FinitePrefix]: Finished finitePrefix Result has 597718 conditions, 297164 events. 212870/297164 cut-off events. For 21220/21220 co-relation queries the response was YES. Maximal size of possible extension queue 6775. Compared 2323418 event pairs, 212051 based on Foata normal form. 0/277095 useless extension candidates. Maximal degree in co-relation 597650. Up to 278960 conditions per place. [2023-08-26 18:42:52,445 INFO L140 encePairwiseOnDemand]: 345/348 looper letters, 49 selfloop transitions, 1 changer transitions 0/68 dead transitions. [2023-08-26 18:42:52,445 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 77 places, 68 transitions, 284 flow [2023-08-26 18:42:52,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:42:52,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:42:52,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 504 transitions. [2023-08-26 18:42:52,447 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4827586206896552 [2023-08-26 18:42:52,447 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 504 transitions. [2023-08-26 18:42:52,447 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 504 transitions. [2023-08-26 18:42:52,448 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:42:52,448 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 504 transitions. [2023-08-26 18:42:52,449 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 168.0) internal successors, (504), 3 states have internal predecessors, (504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:42:52,450 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 348.0) internal successors, (1392), 4 states have internal predecessors, (1392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:42:52,451 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 348.0) internal successors, (1392), 4 states have internal predecessors, (1392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:42:52,451 INFO L175 Difference]: Start difference. First operand has 80 places, 70 transitions, 188 flow. Second operand 3 states and 504 transitions. [2023-08-26 18:42:52,451 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 77 places, 68 transitions, 284 flow [2023-08-26 18:42:52,481 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 75 places, 68 transitions, 280 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:42:52,482 INFO L231 Difference]: Finished difference. Result has 75 places, 68 transitions, 182 flow [2023-08-26 18:42:52,482 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=348, PETRI_DIFFERENCE_MINUEND_FLOW=180, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=68, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=67, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=182, PETRI_PLACES=75, PETRI_TRANSITIONS=68} [2023-08-26 18:42:52,482 INFO L281 CegarLoopForPetriNet]: 78 programPoint places, -3 predicate places. [2023-08-26 18:42:52,482 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 68 transitions, 182 flow [2023-08-26 18:42:52,483 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 151.66666666666666) internal successors, (455), 3 states have internal predecessors, (455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:42:52,483 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:42:52,483 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:42:52,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-26 18:42:52,483 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:42:52,483 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:42:52,483 INFO L85 PathProgramCache]: Analyzing trace with hash 993139645, now seen corresponding path program 1 times [2023-08-26 18:42:52,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:42:52,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541600184] [2023-08-26 18:42:52,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:42:52,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:42:52,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:42:52,539 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:42:52,539 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:42:52,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541600184] [2023-08-26 18:42:52,539 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541600184] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:42:52,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639403474] [2023-08-26 18:42:52,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:42:52,540 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:42:52,540 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:42:52,541 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:42:52,543 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-08-26 18:42:52,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:42:52,616 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:42:52,617 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:42:52,626 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:42:52,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:42:52,652 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:42:52,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:42:52,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [639403474] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:42:52,683 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:42:52,683 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-08-26 18:42:52,684 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740561153] [2023-08-26 18:42:52,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:42:52,686 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 18:42:52,686 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:42:52,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 18:42:52,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-08-26 18:42:52,687 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 146 out of 348 [2023-08-26 18:42:52,688 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 68 transitions, 182 flow. Second operand has 7 states, 7 states have (on average 147.71428571428572) internal successors, (1034), 7 states have internal predecessors, (1034), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:42:52,688 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:42:52,688 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 146 of 348 [2023-08-26 18:42:52,688 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:43:10,887 INFO L124 PetriNetUnfolderBase]: 211371/289876 cut-off events. [2023-08-26 18:43:10,887 INFO L125 PetriNetUnfolderBase]: For 17992/17992 co-relation queries the response was YES. [2023-08-26 18:43:11,610 INFO L83 FinitePrefix]: Finished finitePrefix Result has 587204 conditions, 289876 events. 211371/289876 cut-off events. For 17992/17992 co-relation queries the response was YES. Maximal size of possible extension queue 6808. Compared 2209141 event pairs, 66975 based on Foata normal form. 8/272713 useless extension candidates. Maximal degree in co-relation 587192. Up to 233710 conditions per place. [2023-08-26 18:43:12,613 INFO L140 encePairwiseOnDemand]: 343/348 looper letters, 121 selfloop transitions, 7 changer transitions 1/147 dead transitions. [2023-08-26 18:43:12,613 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 147 transitions, 606 flow [2023-08-26 18:43:12,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:43:12,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:43:12,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1009 transitions. [2023-08-26 18:43:12,615 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48323754789272033 [2023-08-26 18:43:12,615 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1009 transitions. [2023-08-26 18:43:12,615 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1009 transitions. [2023-08-26 18:43:12,616 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:43:12,616 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1009 transitions. [2023-08-26 18:43:12,618 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 168.16666666666666) internal successors, (1009), 6 states have internal predecessors, (1009), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:43:12,620 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 348.0) internal successors, (2436), 7 states have internal predecessors, (2436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:43:12,621 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 348.0) internal successors, (2436), 7 states have internal predecessors, (2436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:43:12,621 INFO L175 Difference]: Start difference. First operand has 75 places, 68 transitions, 182 flow. Second operand 6 states and 1009 transitions. [2023-08-26 18:43:12,621 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 80 places, 147 transitions, 606 flow [2023-08-26 18:43:12,623 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 147 transitions, 605 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:43:12,624 INFO L231 Difference]: Finished difference. Result has 83 places, 72 transitions, 233 flow [2023-08-26 18:43:12,624 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=348, PETRI_DIFFERENCE_MINUEND_FLOW=181, PETRI_DIFFERENCE_MINUEND_PLACES=74, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=68, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=64, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=233, PETRI_PLACES=83, PETRI_TRANSITIONS=72} [2023-08-26 18:43:12,625 INFO L281 CegarLoopForPetriNet]: 78 programPoint places, 5 predicate places. [2023-08-26 18:43:12,625 INFO L495 AbstractCegarLoop]: Abstraction has has 83 places, 72 transitions, 233 flow [2023-08-26 18:43:12,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 147.71428571428572) internal successors, (1034), 7 states have internal predecessors, (1034), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:43:12,625 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:43:12,625 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 18:43:12,630 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-08-26 18:43:12,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-08-26 18:43:12,830 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:43:12,830 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:43:12,830 INFO L85 PathProgramCache]: Analyzing trace with hash 1968783205, now seen corresponding path program 1 times [2023-08-26 18:43:12,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:43:12,831 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164145191] [2023-08-26 18:43:12,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:43:12,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:43:12,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:43:12,870 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 18:43:12,870 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:43:12,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164145191] [2023-08-26 18:43:12,870 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164145191] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:43:12,870 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:43:12,870 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:43:12,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479086489] [2023-08-26 18:43:12,870 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:43:12,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:43:12,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:43:12,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:43:12,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:43:12,872 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 149 out of 348 [2023-08-26 18:43:12,872 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 83 places, 72 transitions, 233 flow. Second operand has 3 states, 3 states have (on average 151.66666666666666) internal successors, (455), 3 states have internal predecessors, (455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:43:12,872 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:43:12,872 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 149 of 348 [2023-08-26 18:43:12,872 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:44:07,608 INFO L124 PetriNetUnfolderBase]: 657773/893995 cut-off events. [2023-08-26 18:44:07,608 INFO L125 PetriNetUnfolderBase]: For 250009/250009 co-relation queries the response was YES. [2023-08-26 18:44:10,748 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1877525 conditions, 893995 events. 657773/893995 cut-off events. For 250009/250009 co-relation queries the response was YES. Maximal size of possible extension queue 16439. Compared 7015881 event pairs, 277922 based on Foata normal form. 0/850074 useless extension candidates. Maximal degree in co-relation 1877508. Up to 623750 conditions per place. [2023-08-26 18:44:14,392 INFO L140 encePairwiseOnDemand]: 337/348 looper letters, 111 selfloop transitions, 10 changer transitions 0/131 dead transitions. [2023-08-26 18:44:14,393 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 85 places, 131 transitions, 673 flow [2023-08-26 18:44:14,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:44:14,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:44:14,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 559 transitions. [2023-08-26 18:44:14,396 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5354406130268199 [2023-08-26 18:44:14,396 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 559 transitions. [2023-08-26 18:44:14,397 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 559 transitions. [2023-08-26 18:44:14,397 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:44:14,397 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 559 transitions. [2023-08-26 18:44:14,411 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 186.33333333333334) internal successors, (559), 3 states have internal predecessors, (559), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:14,424 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 348.0) internal successors, (1392), 4 states have internal predecessors, (1392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:14,425 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 348.0) internal successors, (1392), 4 states have internal predecessors, (1392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:14,425 INFO L175 Difference]: Start difference. First operand has 83 places, 72 transitions, 233 flow. Second operand 3 states and 559 transitions. [2023-08-26 18:44:14,425 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 85 places, 131 transitions, 673 flow [2023-08-26 18:44:14,574 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 83 places, 131 transitions, 646 flow, removed 10 selfloop flow, removed 2 redundant places. [2023-08-26 18:44:14,575 INFO L231 Difference]: Finished difference. Result has 85 places, 81 transitions, 297 flow [2023-08-26 18:44:14,576 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=348, PETRI_DIFFERENCE_MINUEND_FLOW=219, PETRI_DIFFERENCE_MINUEND_PLACES=81, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=72, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=62, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=297, PETRI_PLACES=85, PETRI_TRANSITIONS=81} [2023-08-26 18:44:14,576 INFO L281 CegarLoopForPetriNet]: 78 programPoint places, 7 predicate places. [2023-08-26 18:44:14,576 INFO L495 AbstractCegarLoop]: Abstraction has has 85 places, 81 transitions, 297 flow [2023-08-26 18:44:14,578 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 151.66666666666666) internal successors, (455), 3 states have internal predecessors, (455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:14,578 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:44:14,578 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:44:14,588 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-08-26 18:44:14,588 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:44:14,589 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:44:14,589 INFO L85 PathProgramCache]: Analyzing trace with hash -51933289, now seen corresponding path program 1 times [2023-08-26 18:44:14,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:44:14,589 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773887333] [2023-08-26 18:44:14,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:44:14,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:44:14,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:44:14,731 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-08-26 18:44:14,731 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:44:14,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773887333] [2023-08-26 18:44:14,731 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773887333] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:44:14,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789330195] [2023-08-26 18:44:14,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:44:14,732 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:44:14,732 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:44:14,745 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:44:14,805 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-08-26 18:44:14,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:44:14,913 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:44:14,914 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:44:14,944 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:44:14,944 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:44:15,004 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:44:15,004 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [789330195] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:44:15,004 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:44:15,004 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 11 [2023-08-26 18:44:15,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726677946] [2023-08-26 18:44:15,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:44:15,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-08-26 18:44:15,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:44:15,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-08-26 18:44:15,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2023-08-26 18:44:15,007 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 140 out of 348 [2023-08-26 18:44:15,008 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 85 places, 81 transitions, 297 flow. Second operand has 12 states, 12 states have (on average 142.66666666666666) internal successors, (1712), 12 states have internal predecessors, (1712), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:15,008 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:44:15,008 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 140 of 348 [2023-08-26 18:44:15,008 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:44:21,263 INFO L292 olderBase$Statistics]: inserting event number 4 for the transition-marking pair ([1671] L702-3-->L702-5: Formula: (= v_~global~0_210 (+ |v_t_funThread4of4ForFork0_#t~post5_12| 1)) InVars {t_funThread4of4ForFork0_#t~post5=|v_t_funThread4of4ForFork0_#t~post5_12|} OutVars{~global~0=v_~global~0_210} AuxVars[] AssignedVars[t_funThread4of4ForFork0_#t~post5, ~global~0][131], [193#true, Black: 231#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| 8 (* |ULTIMATE.start_main_~i~0#1| 4)) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), 191#(= (select |#valid| |ULTIMATE.start_main_~#t_ids~0#1.base|) 1), Black: 216#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), 36#L702-12true, Black: 212#(and (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (<= 40000 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|))), 237#true, t_funThread1of4ForFork0InUse, 115#L707-13true, Black: 239#(= ~global~0 0), 346#(and (<= 4 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (< |ULTIMATE.start_main_~i~0#1| 9999)), t_funThread2of4ForFork0InUse, t_funThread3of4ForFork0InUse, 128#L702-16true, 45#L702-5true, 19#L702-4true, Black: 186#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|) 40000))]) [2023-08-26 18:44:21,264 INFO L294 olderBase$Statistics]: this new event has 46 ancestors and is cut-off event [2023-08-26 18:44:21,264 INFO L297 olderBase$Statistics]: existing Event has 46 ancestors and is cut-off event [2023-08-26 18:44:21,265 INFO L297 olderBase$Statistics]: existing Event has 46 ancestors and is cut-off event [2023-08-26 18:44:21,265 INFO L297 olderBase$Statistics]: existing Event has 46 ancestors and is cut-off event [2023-08-26 18:44:21,757 INFO L292 olderBase$Statistics]: inserting event number 4 for the transition-marking pair ([1671] L702-3-->L702-5: Formula: (= v_~global~0_210 (+ |v_t_funThread4of4ForFork0_#t~post5_12| 1)) InVars {t_funThread4of4ForFork0_#t~post5=|v_t_funThread4of4ForFork0_#t~post5_12|} OutVars{~global~0=v_~global~0_210} AuxVars[] AssignedVars[t_funThread4of4ForFork0_#t~post5, ~global~0][131], [193#true, 191#(= (select |#valid| |ULTIMATE.start_main_~#t_ids~0#1.base|) 1), Black: 231#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| 8 (* |ULTIMATE.start_main_~i~0#1| 4)) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), Black: 216#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), 36#L702-12true, Black: 212#(and (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (<= 40000 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|))), 237#true, t_funThread1of4ForFork0InUse, Black: 239#(= ~global~0 0), t_funThread2of4ForFork0InUse, 346#(and (<= 4 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (< |ULTIMATE.start_main_~i~0#1| 9999)), t_funThread3of4ForFork0InUse, 67#ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCEtrue, 128#L702-16true, 45#L702-5true, 19#L702-4true, Black: 186#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|) 40000))]) [2023-08-26 18:44:21,757 INFO L294 olderBase$Statistics]: this new event has 47 ancestors and is cut-off event [2023-08-26 18:44:21,757 INFO L297 olderBase$Statistics]: existing Event has 47 ancestors and is cut-off event [2023-08-26 18:44:21,757 INFO L297 olderBase$Statistics]: existing Event has 47 ancestors and is cut-off event [2023-08-26 18:44:21,757 INFO L297 olderBase$Statistics]: existing Event has 47 ancestors and is cut-off event [2023-08-26 18:44:21,758 INFO L292 olderBase$Statistics]: inserting event number 4 for the transition-marking pair ([1671] L702-3-->L702-5: Formula: (= v_~global~0_210 (+ |v_t_funThread4of4ForFork0_#t~post5_12| 1)) InVars {t_funThread4of4ForFork0_#t~post5=|v_t_funThread4of4ForFork0_#t~post5_12|} OutVars{~global~0=v_~global~0_210} AuxVars[] AssignedVars[t_funThread4of4ForFork0_#t~post5, ~global~0][131], [193#true, 137#t_funEXITtrue, Black: 231#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| 8 (* |ULTIMATE.start_main_~i~0#1| 4)) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), 191#(= (select |#valid| |ULTIMATE.start_main_~#t_ids~0#1.base|) 1), Black: 216#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), 36#L702-12true, Black: 212#(and (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (<= 40000 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|))), 237#true, t_funThread1of4ForFork0InUse, 115#L707-13true, Black: 239#(= ~global~0 0), t_funThread2of4ForFork0InUse, 346#(and (<= 4 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (< |ULTIMATE.start_main_~i~0#1| 9999)), t_funThread3of4ForFork0InUse, 19#L702-4true, 45#L702-5true, Black: 186#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|) 40000))]) [2023-08-26 18:44:21,758 INFO L294 olderBase$Statistics]: this new event has 47 ancestors and is cut-off event [2023-08-26 18:44:21,758 INFO L297 olderBase$Statistics]: existing Event has 47 ancestors and is cut-off event [2023-08-26 18:44:21,759 INFO L297 olderBase$Statistics]: existing Event has 47 ancestors and is cut-off event [2023-08-26 18:44:21,759 INFO L297 olderBase$Statistics]: existing Event has 47 ancestors and is cut-off event [2023-08-26 18:44:22,097 INFO L292 olderBase$Statistics]: inserting event number 4 for the transition-marking pair ([1671] L702-3-->L702-5: Formula: (= v_~global~0_210 (+ |v_t_funThread4of4ForFork0_#t~post5_12| 1)) InVars {t_funThread4of4ForFork0_#t~post5=|v_t_funThread4of4ForFork0_#t~post5_12|} OutVars{~global~0=v_~global~0_210} AuxVars[] AssignedVars[t_funThread4of4ForFork0_#t~post5, ~global~0][131], [193#true, 137#t_funEXITtrue, 191#(= (select |#valid| |ULTIMATE.start_main_~#t_ids~0#1.base|) 1), Black: 231#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| 8 (* |ULTIMATE.start_main_~i~0#1| 4)) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), Black: 216#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), 36#L702-12true, Black: 212#(and (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (<= 40000 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|))), 237#true, t_funThread1of4ForFork0InUse, Black: 239#(= ~global~0 0), 346#(and (<= 4 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (< |ULTIMATE.start_main_~i~0#1| 9999)), t_funThread2of4ForFork0InUse, t_funThread3of4ForFork0InUse, 67#ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCEtrue, 45#L702-5true, 19#L702-4true, Black: 186#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|) 40000))]) [2023-08-26 18:44:22,098 INFO L294 olderBase$Statistics]: this new event has 48 ancestors and is cut-off event [2023-08-26 18:44:22,098 INFO L297 olderBase$Statistics]: existing Event has 48 ancestors and is cut-off event [2023-08-26 18:44:22,098 INFO L297 olderBase$Statistics]: existing Event has 48 ancestors and is cut-off event [2023-08-26 18:44:22,098 INFO L297 olderBase$Statistics]: existing Event has 48 ancestors and is cut-off event [2023-08-26 18:44:22,377 INFO L292 olderBase$Statistics]: inserting event number 4 for the transition-marking pair ([1682] L702-11-->L702-13: Formula: (= |v_t_funThread4of4ForFork0_#t~post7_12| (+ v_~global~0_214 1)) InVars {t_funThread4of4ForFork0_#t~post7=|v_t_funThread4of4ForFork0_#t~post7_12|} OutVars{~global~0=v_~global~0_214} AuxVars[] AssignedVars[~global~0, t_funThread4of4ForFork0_#t~post7][132], [193#true, 191#(= (select |#valid| |ULTIMATE.start_main_~#t_ids~0#1.base|) 1), 53#L702-12true, Black: 231#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| 8 (* |ULTIMATE.start_main_~i~0#1| 4)) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), Black: 216#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), 36#L702-12true, Black: 212#(and (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (<= 40000 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|))), 237#true, t_funThread1of4ForFork0InUse, 115#L707-13true, Black: 239#(= ~global~0 0), 346#(and (<= 4 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (< |ULTIMATE.start_main_~i~0#1| 9999)), t_funThread2of4ForFork0InUse, t_funThread3of4ForFork0InUse, 19#L702-4true, 82#L702-13true, Black: 186#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|) 40000))]) [2023-08-26 18:44:22,377 INFO L294 olderBase$Statistics]: this new event has 49 ancestors and is cut-off event [2023-08-26 18:44:22,377 INFO L297 olderBase$Statistics]: existing Event has 49 ancestors and is cut-off event [2023-08-26 18:44:22,377 INFO L297 olderBase$Statistics]: existing Event has 49 ancestors and is cut-off event [2023-08-26 18:44:22,377 INFO L297 olderBase$Statistics]: existing Event has 49 ancestors and is cut-off event [2023-08-26 18:44:22,543 INFO L292 olderBase$Statistics]: inserting event number 4 for the transition-marking pair ([1682] L702-11-->L702-13: Formula: (= |v_t_funThread4of4ForFork0_#t~post7_12| (+ v_~global~0_214 1)) InVars {t_funThread4of4ForFork0_#t~post7=|v_t_funThread4of4ForFork0_#t~post7_12|} OutVars{~global~0=v_~global~0_214} AuxVars[] AssignedVars[~global~0, t_funThread4of4ForFork0_#t~post7][132], [193#true, 53#L702-12true, 191#(= (select |#valid| |ULTIMATE.start_main_~#t_ids~0#1.base|) 1), Black: 231#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| 8 (* |ULTIMATE.start_main_~i~0#1| 4)) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), 36#L702-12true, Black: 216#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), Black: 212#(and (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (<= 40000 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|))), 237#true, t_funThread1of4ForFork0InUse, Black: 239#(= ~global~0 0), t_funThread2of4ForFork0InUse, 346#(and (<= 4 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (< |ULTIMATE.start_main_~i~0#1| 9999)), t_funThread3of4ForFork0InUse, 67#ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCEtrue, 19#L702-4true, Black: 186#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|) 40000)), 82#L702-13true]) [2023-08-26 18:44:22,543 INFO L294 olderBase$Statistics]: this new event has 50 ancestors and is cut-off event [2023-08-26 18:44:22,543 INFO L297 olderBase$Statistics]: existing Event has 50 ancestors and is cut-off event [2023-08-26 18:44:22,543 INFO L297 olderBase$Statistics]: existing Event has 50 ancestors and is cut-off event [2023-08-26 18:44:22,543 INFO L297 olderBase$Statistics]: existing Event has 50 ancestors and is cut-off event [2023-08-26 18:44:23,372 INFO L124 PetriNetUnfolderBase]: 64006/88660 cut-off events. [2023-08-26 18:44:23,372 INFO L125 PetriNetUnfolderBase]: For 92419/92473 co-relation queries the response was YES. [2023-08-26 18:44:23,739 INFO L83 FinitePrefix]: Finished finitePrefix Result has 227535 conditions, 88660 events. 64006/88660 cut-off events. For 92419/92473 co-relation queries the response was YES. Maximal size of possible extension queue 2515. Compared 613775 event pairs, 8289 based on Foata normal form. 6598/91723 useless extension candidates. Maximal degree in co-relation 227516. Up to 54481 conditions per place. [2023-08-26 18:44:24,078 INFO L140 encePairwiseOnDemand]: 345/348 looper letters, 118 selfloop transitions, 5 changer transitions 0/140 dead transitions. [2023-08-26 18:44:24,079 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 81 places, 140 transitions, 669 flow [2023-08-26 18:44:24,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 18:44:24,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 18:44:24,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1097 transitions. [2023-08-26 18:44:24,082 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4503284072249589 [2023-08-26 18:44:24,082 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1097 transitions. [2023-08-26 18:44:24,082 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1097 transitions. [2023-08-26 18:44:24,082 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:44:24,082 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1097 transitions. [2023-08-26 18:44:24,084 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 156.71428571428572) internal successors, (1097), 7 states have internal predecessors, (1097), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:24,087 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 348.0) internal successors, (2784), 8 states have internal predecessors, (2784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:24,088 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 348.0) internal successors, (2784), 8 states have internal predecessors, (2784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:24,088 INFO L175 Difference]: Start difference. First operand has 85 places, 81 transitions, 297 flow. Second operand 7 states and 1097 transitions. [2023-08-26 18:44:24,088 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 81 places, 140 transitions, 669 flow [2023-08-26 18:44:24,105 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 78 places, 140 transitions, 637 flow, removed 3 selfloop flow, removed 3 redundant places. [2023-08-26 18:44:24,106 INFO L231 Difference]: Finished difference. Result has 78 places, 60 transitions, 201 flow [2023-08-26 18:44:24,107 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=348, PETRI_DIFFERENCE_MINUEND_FLOW=191, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=60, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=201, PETRI_PLACES=78, PETRI_TRANSITIONS=60} [2023-08-26 18:44:24,108 INFO L281 CegarLoopForPetriNet]: 78 programPoint places, 0 predicate places. [2023-08-26 18:44:24,108 INFO L495 AbstractCegarLoop]: Abstraction has has 78 places, 60 transitions, 201 flow [2023-08-26 18:44:24,108 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 142.66666666666666) internal successors, (1712), 12 states have internal predecessors, (1712), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:24,109 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:44:24,109 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 18:44:24,114 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-08-26 18:44:24,313 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:44:24,314 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:44:24,314 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:44:24,314 INFO L85 PathProgramCache]: Analyzing trace with hash 998066734, now seen corresponding path program 1 times [2023-08-26 18:44:24,314 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:44:24,314 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314979900] [2023-08-26 18:44:24,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:44:24,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:44:24,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:44:24,545 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:44:24,546 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:44:24,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314979900] [2023-08-26 18:44:24,546 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314979900] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:44:24,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3507367] [2023-08-26 18:44:24,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:44:24,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:44:24,546 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:44:24,547 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 18:44:24,557 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 18:44:24,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:44:24,674 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 15 conjunts are in the unsatisfiable core [2023-08-26 18:44:24,676 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:44:24,681 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:44:24,862 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:44:24,862 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:44:25,007 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:44:25,008 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3507367] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:44:25,008 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:44:25,008 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2023-08-26 18:44:25,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472625090] [2023-08-26 18:44:25,008 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:44:25,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-08-26 18:44:25,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:44:25,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-08-26 18:44:25,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2023-08-26 18:44:25,011 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 146 out of 348 [2023-08-26 18:44:25,013 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 78 places, 60 transitions, 201 flow. Second operand has 17 states, 17 states have (on average 148.47058823529412) internal successors, (2524), 17 states have internal predecessors, (2524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:25,013 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:44:25,013 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 146 of 348 [2023-08-26 18:44:25,013 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:44:29,213 INFO L292 olderBase$Statistics]: inserting event number 4 for the transition-marking pair ([1671] L702-3-->L702-5: Formula: (= v_~global~0_210 (+ |v_t_funThread4of4ForFork0_#t~post5_12| 1)) InVars {t_funThread4of4ForFork0_#t~post5=|v_t_funThread4of4ForFork0_#t~post5_12|} OutVars{~global~0=v_~global~0_210} AuxVars[] AssignedVars[t_funThread4of4ForFork0_#t~post5, ~global~0][130], [191#(= (select |#valid| |ULTIMATE.start_main_~#t_ids~0#1.base|) 1), Black: 231#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| 8 (* |ULTIMATE.start_main_~i~0#1| 4)) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), Black: 216#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), 36#L702-12true, Black: 212#(and (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (<= 40000 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|))), t_funThread1of4ForFork0InUse, 115#L707-13true, Black: 239#(= ~global~0 0), 346#(and (<= 4 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (< |ULTIMATE.start_main_~i~0#1| 9999)), t_funThread2of4ForFork0InUse, 474#(and (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 4) (= (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|) 40000)), t_funThread3of4ForFork0InUse, 128#L702-16true, 45#L702-5true, 19#L702-4true, Black: 186#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|) 40000))]) [2023-08-26 18:44:29,213 INFO L294 olderBase$Statistics]: this new event has 46 ancestors and is cut-off event [2023-08-26 18:44:29,213 INFO L297 olderBase$Statistics]: existing Event has 46 ancestors and is cut-off event [2023-08-26 18:44:29,213 INFO L297 olderBase$Statistics]: existing Event has 46 ancestors and is cut-off event [2023-08-26 18:44:29,213 INFO L297 olderBase$Statistics]: existing Event has 46 ancestors and is cut-off event [2023-08-26 18:44:29,361 INFO L292 olderBase$Statistics]: inserting event number 4 for the transition-marking pair ([1671] L702-3-->L702-5: Formula: (= v_~global~0_210 (+ |v_t_funThread4of4ForFork0_#t~post5_12| 1)) InVars {t_funThread4of4ForFork0_#t~post5=|v_t_funThread4of4ForFork0_#t~post5_12|} OutVars{~global~0=v_~global~0_210} AuxVars[] AssignedVars[t_funThread4of4ForFork0_#t~post5, ~global~0][130], [137#t_funEXITtrue, 191#(= (select |#valid| |ULTIMATE.start_main_~#t_ids~0#1.base|) 1), Black: 231#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| 8 (* |ULTIMATE.start_main_~i~0#1| 4)) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), Black: 216#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), 36#L702-12true, Black: 212#(and (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (<= 40000 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|))), t_funThread1of4ForFork0InUse, 115#L707-13true, Black: 239#(= ~global~0 0), 346#(and (<= 4 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (< |ULTIMATE.start_main_~i~0#1| 9999)), t_funThread2of4ForFork0InUse, 474#(and (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 4) (= (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|) 40000)), t_funThread3of4ForFork0InUse, 45#L702-5true, 19#L702-4true, Black: 186#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|) 40000))]) [2023-08-26 18:44:29,362 INFO L294 olderBase$Statistics]: this new event has 47 ancestors and is cut-off event [2023-08-26 18:44:29,362 INFO L297 olderBase$Statistics]: existing Event has 47 ancestors and is cut-off event [2023-08-26 18:44:29,362 INFO L297 olderBase$Statistics]: existing Event has 47 ancestors and is cut-off event [2023-08-26 18:44:29,362 INFO L297 olderBase$Statistics]: existing Event has 47 ancestors and is cut-off event [2023-08-26 18:44:29,626 INFO L292 olderBase$Statistics]: inserting event number 4 for the transition-marking pair ([1682] L702-11-->L702-13: Formula: (= |v_t_funThread4of4ForFork0_#t~post7_12| (+ v_~global~0_214 1)) InVars {t_funThread4of4ForFork0_#t~post7=|v_t_funThread4of4ForFork0_#t~post7_12|} OutVars{~global~0=v_~global~0_214} AuxVars[] AssignedVars[~global~0, t_funThread4of4ForFork0_#t~post7][131], [53#L702-12true, 191#(= (select |#valid| |ULTIMATE.start_main_~#t_ids~0#1.base|) 1), Black: 231#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| 8 (* |ULTIMATE.start_main_~i~0#1| 4)) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), Black: 216#(and (<= (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4) 4) (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (<= 0 (+ |ULTIMATE.start_main_~#t_ids~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)))), 36#L702-12true, Black: 212#(and (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (<= 40000 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|))), t_funThread1of4ForFork0InUse, 115#L707-13true, Black: 239#(= ~global~0 0), 346#(and (<= 4 (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|)) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (< |ULTIMATE.start_main_~i~0#1| 9999)), t_funThread2of4ForFork0InUse, 474#(and (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 4) (= (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|) 40000)), t_funThread3of4ForFork0InUse, 19#L702-4true, Black: 186#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~#t_ids~0#1.offset| 0) (= (select |#length| |ULTIMATE.start_main_~#t_ids~0#1.base|) 40000)), 82#L702-13true]) [2023-08-26 18:44:29,626 INFO L294 olderBase$Statistics]: this new event has 49 ancestors and is cut-off event [2023-08-26 18:44:29,626 INFO L297 olderBase$Statistics]: existing Event has 49 ancestors and is cut-off event [2023-08-26 18:44:29,626 INFO L297 olderBase$Statistics]: existing Event has 49 ancestors and is cut-off event [2023-08-26 18:44:29,627 INFO L297 olderBase$Statistics]: existing Event has 49 ancestors and is cut-off event [2023-08-26 18:44:30,029 INFO L124 PetriNetUnfolderBase]: 42224/60323 cut-off events. [2023-08-26 18:44:30,029 INFO L125 PetriNetUnfolderBase]: For 92793/92809 co-relation queries the response was YES. [2023-08-26 18:44:30,304 INFO L83 FinitePrefix]: Finished finitePrefix Result has 142407 conditions, 60323 events. 42224/60323 cut-off events. For 92793/92809 co-relation queries the response was YES. Maximal size of possible extension queue 1769. Compared 426451 event pairs, 2252 based on Foata normal form. 5911/64137 useless extension candidates. Maximal degree in co-relation 142389. Up to 27066 conditions per place. [2023-08-26 18:44:30,347 INFO L140 encePairwiseOnDemand]: 345/348 looper letters, 0 selfloop transitions, 0 changer transitions 139/139 dead transitions. [2023-08-26 18:44:30,348 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 83 places, 139 transitions, 635 flow [2023-08-26 18:44:30,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 18:44:30,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 18:44:30,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1136 transitions. [2023-08-26 18:44:30,350 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4663382594417077 [2023-08-26 18:44:30,350 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1136 transitions. [2023-08-26 18:44:30,350 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1136 transitions. [2023-08-26 18:44:30,351 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:44:30,351 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1136 transitions. [2023-08-26 18:44:30,359 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 162.28571428571428) internal successors, (1136), 7 states have internal predecessors, (1136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:30,362 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 348.0) internal successors, (2784), 8 states have internal predecessors, (2784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:30,363 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 348.0) internal successors, (2784), 8 states have internal predecessors, (2784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:30,363 INFO L175 Difference]: Start difference. First operand has 78 places, 60 transitions, 201 flow. Second operand 7 states and 1136 transitions. [2023-08-26 18:44:30,363 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 83 places, 139 transitions, 635 flow [2023-08-26 18:44:30,373 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 139 transitions, 618 flow, removed 0 selfloop flow, removed 9 redundant places. [2023-08-26 18:44:30,374 INFO L231 Difference]: Finished difference. Result has 74 places, 0 transitions, 0 flow [2023-08-26 18:44:30,374 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=348, PETRI_DIFFERENCE_MINUEND_FLOW=174, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=59, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=0, PETRI_PLACES=74, PETRI_TRANSITIONS=0} [2023-08-26 18:44:30,375 INFO L281 CegarLoopForPetriNet]: 78 programPoint places, -4 predicate places. [2023-08-26 18:44:30,375 INFO L495 AbstractCegarLoop]: Abstraction has has 74 places, 0 transitions, 0 flow [2023-08-26 18:44:30,376 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 148.47058823529412) internal successors, (2524), 17 states have internal predecessors, (2524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:30,376 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:44:30,376 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:44:30,376 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:44:30,378 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:44:30,378 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:44:30,386 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-08-26 18:44:30,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:44:30,584 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2023-08-26 18:44:30,584 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:44:30,586 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 206 transitions, 456 flow [2023-08-26 18:44:30,637 INFO L124 PetriNetUnfolderBase]: 86/609 cut-off events. [2023-08-26 18:44:30,637 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:44:30,643 INFO L83 FinitePrefix]: Finished finitePrefix Result has 664 conditions, 609 events. 86/609 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2434 event pairs, 6 based on Foata normal form. 0/476 useless extension candidates. Maximal degree in co-relation 416. Up to 32 conditions per place. [2023-08-26 18:44:30,643 INFO L82 GeneralOperation]: Start removeDead. Operand has 181 places, 206 transitions, 456 flow [2023-08-26 18:44:30,659 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 181 places, 206 transitions, 456 flow [2023-08-26 18:44:30,659 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:44:30,660 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 181 places, 206 transitions, 456 flow [2023-08-26 18:44:30,660 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 181 places, 206 transitions, 456 flow [2023-08-26 18:44:30,660 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 181 places, 206 transitions, 456 flow [2023-08-26 18:44:30,761 INFO L124 PetriNetUnfolderBase]: 86/609 cut-off events. [2023-08-26 18:44:30,761 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:44:30,783 INFO L83 FinitePrefix]: Finished finitePrefix Result has 664 conditions, 609 events. 86/609 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2434 event pairs, 6 based on Foata normal form. 0/476 useless extension candidates. Maximal degree in co-relation 416. Up to 32 conditions per place. [2023-08-26 18:44:30,795 INFO L119 LiptonReduction]: Number of co-enabled transitions 22288 [2023-08-26 18:44:34,252 INFO L134 LiptonReduction]: Checked pairs total: 67770 [2023-08-26 18:44:34,252 INFO L136 LiptonReduction]: Total number of compositions: 140 [2023-08-26 18:44:34,253 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:44:34,253 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;@58c2a9ea, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:44:34,253 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:44:34,262 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:44:34,263 INFO L124 PetriNetUnfolderBase]: 37/164 cut-off events. [2023-08-26 18:44:34,263 INFO L125 PetriNetUnfolderBase]: For 23/23 co-relation queries the response was YES. [2023-08-26 18:44:34,263 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:44:34,263 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 18:44:34,263 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:44:34,263 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:44:34,263 INFO L85 PathProgramCache]: Analyzing trace with hash -736567434, now seen corresponding path program 1 times [2023-08-26 18:44:34,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:44:34,263 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242785826] [2023-08-26 18:44:34,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:44:34,264 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:44:34,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:44:34,279 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:44:34,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:44:34,290 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:44:34,290 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:44:34,290 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:44:34,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-08-26 18:44:34,291 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:44:34,291 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:44:34,291 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:44:34,291 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-26 18:44:34,311 INFO L144 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2023-08-26 18:44:34,313 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 206 places, 236 transitions, 532 flow [2023-08-26 18:44:34,407 INFO L124 PetriNetUnfolderBase]: 146/978 cut-off events. [2023-08-26 18:44:34,407 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-26 18:44:34,415 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1089 conditions, 978 events. 146/978 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 4724 event pairs, 23 based on Foata normal form. 0/766 useless extension candidates. Maximal degree in co-relation 654. Up to 80 conditions per place. [2023-08-26 18:44:34,415 INFO L82 GeneralOperation]: Start removeDead. Operand has 206 places, 236 transitions, 532 flow [2023-08-26 18:44:34,421 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 206 places, 236 transitions, 532 flow [2023-08-26 18:44:34,421 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:44:34,421 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 206 places, 236 transitions, 532 flow [2023-08-26 18:44:34,421 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 206 places, 236 transitions, 532 flow [2023-08-26 18:44:34,421 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 206 places, 236 transitions, 532 flow [2023-08-26 18:44:34,523 INFO L124 PetriNetUnfolderBase]: 146/978 cut-off events. [2023-08-26 18:44:34,523 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-26 18:44:34,537 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1089 conditions, 978 events. 146/978 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 4724 event pairs, 23 based on Foata normal form. 0/766 useless extension candidates. Maximal degree in co-relation 654. Up to 80 conditions per place. [2023-08-26 18:44:34,563 INFO L119 LiptonReduction]: Number of co-enabled transitions 32200 [2023-08-26 18:44:37,692 INFO L134 LiptonReduction]: Checked pairs total: 99834 [2023-08-26 18:44:37,692 INFO L136 LiptonReduction]: Total number of compositions: 155 [2023-08-26 18:44:37,693 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:44:37,693 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;@58c2a9ea, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:44:37,693 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:44:37,694 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:44:37,694 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:44:37,694 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:44:37,694 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:44:37,694 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:44:37,695 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:44:37,695 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:44:37,695 INFO L85 PathProgramCache]: Analyzing trace with hash 74780, now seen corresponding path program 1 times [2023-08-26 18:44:37,695 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:44:37,695 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941537393] [2023-08-26 18:44:37,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:44:37,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:44:37,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:44:37,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:44:37,715 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:44:37,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941537393] [2023-08-26 18:44:37,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941537393] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:44:37,715 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:44:37,715 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:44:37,716 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676749114] [2023-08-26 18:44:37,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:44:37,716 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:44:37,716 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:44:37,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:44:37,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:44:37,717 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 173 out of 391 [2023-08-26 18:44:37,717 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 92 places, 120 transitions, 300 flow. Second operand has 3 states, 3 states have (on average 173.66666666666666) internal successors, (521), 3 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:44:37,717 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:44:37,717 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 173 of 391 [2023-08-26 18:44:37,718 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand