/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_21-deref_read_racing.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 18:49:17,489 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 18:49:17,557 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf [2023-08-26 18:49:17,566 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 18:49:17,567 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 18:49:17,601 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 18:49:17,602 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 18:49:17,602 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 18:49:17,603 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 18:49:17,606 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 18:49:17,607 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 18:49:17,607 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 18:49:17,607 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 18:49:17,607 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 18:49:17,608 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 18:49:17,608 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 18:49:17,608 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 18:49:17,608 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 18:49:17,609 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 18:49:17,609 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 18:49:17,609 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 18:49:17,610 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 18:49:17,610 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 18:49:17,611 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 18:49:17,611 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 18:49:17,611 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 18:49:17,611 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 18:49:17,611 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:49:17,612 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 18:49:17,612 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 18:49:17,613 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 18:49:17,613 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 18:49:17,613 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 18:49:17,613 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 18:49:17,614 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 18:49:17,614 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 18:49:17,921 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 18:49:17,946 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 18:49:17,948 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 18:49:17,949 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 18:49:17,949 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 18:49:17,950 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_21-deref_read_racing.i [2023-08-26 18:49:19,115 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 18:49:19,402 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 18:49:19,402 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_21-deref_read_racing.i [2023-08-26 18:49:19,420 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9dc3be671/ed692ba1757440bd9eca8d57fa0d4196/FLAG284aabe09 [2023-08-26 18:49:19,431 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9dc3be671/ed692ba1757440bd9eca8d57fa0d4196 [2023-08-26 18:49:19,433 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 18:49:19,434 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 18:49:19,435 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 18:49:19,435 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 18:49:19,437 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 18:49:19,438 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:19,439 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@288993e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19, skipping insertion in model container [2023-08-26 18:49:19,439 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:19,493 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 18:49:19,815 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:49:19,828 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 18:49:19,856 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 18:49:19,857 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 18:49:19,883 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:49:19,924 INFO L206 MainTranslator]: Completed translation [2023-08-26 18:49:19,925 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19 WrapperNode [2023-08-26 18:49:19,925 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 18:49:19,926 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 18:49:19,926 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 18:49:19,926 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 18:49:19,932 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:19,960 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:19,984 INFO L138 Inliner]: procedures = 170, calls = 36, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 69 [2023-08-26 18:49:19,985 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 18:49:19,986 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 18:49:19,986 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 18:49:19,987 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 18:49:19,995 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:19,995 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:20,007 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:20,008 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:20,017 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:20,020 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:20,026 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:20,027 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:20,029 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 18:49:20,030 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 18:49:20,030 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 18:49:20,030 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 18:49:20,031 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19" (1/1) ... [2023-08-26 18:49:20,035 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:49:20,052 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:49:20,064 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-26 18:49:20,066 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-26 18:49:20,091 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 18:49:20,091 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 18:49:20,091 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 18:49:20,091 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 18:49:20,092 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 18:49:20,092 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 18:49:20,092 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 18:49:20,092 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 18:49:20,092 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 18:49:20,092 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 18:49:20,092 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 18:49:20,094 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-26 18:49:20,195 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 18:49:20,197 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 18:49:20,466 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 18:49:20,472 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 18:49:20,472 INFO L302 CfgBuilder]: Removed 9 assume(true) statements. [2023-08-26 18:49:20,474 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:49:20 BoogieIcfgContainer [2023-08-26 18:49:20,474 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 18:49:20,476 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 18:49:20,476 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 18:49:20,480 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 18:49:20,481 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 06:49:19" (1/3) ... [2023-08-26 18:49:20,481 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77416dda and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:49:20, skipping insertion in model container [2023-08-26 18:49:20,481 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:49:19" (2/3) ... [2023-08-26 18:49:20,482 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77416dda and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:49:20, skipping insertion in model container [2023-08-26 18:49:20,482 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:49:20" (3/3) ... [2023-08-26 18:49:20,483 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_21-deref_read_racing.i [2023-08-26 18:49:20,498 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 18:49:20,499 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 13 error locations. [2023-08-26 18:49:20,499 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 18:49:20,577 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:49:20,611 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 106 places, 114 transitions, 233 flow [2023-08-26 18:49:20,681 INFO L124 PetriNetUnfolderBase]: 16/151 cut-off events. [2023-08-26 18:49:20,682 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:20,687 INFO L83 FinitePrefix]: Finished finitePrefix Result has 156 conditions, 151 events. 16/151 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 411 event pairs, 0 based on Foata normal form. 0/115 useless extension candidates. Maximal degree in co-relation 82. Up to 4 conditions per place. [2023-08-26 18:49:20,687 INFO L82 GeneralOperation]: Start removeDead. Operand has 106 places, 114 transitions, 233 flow [2023-08-26 18:49:20,694 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 106 places, 114 transitions, 233 flow [2023-08-26 18:49:20,699 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:20,711 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 106 places, 114 transitions, 233 flow [2023-08-26 18:49:20,714 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 106 places, 114 transitions, 233 flow [2023-08-26 18:49:20,715 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 106 places, 114 transitions, 233 flow [2023-08-26 18:49:20,765 INFO L124 PetriNetUnfolderBase]: 16/151 cut-off events. [2023-08-26 18:49:20,766 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:20,767 INFO L83 FinitePrefix]: Finished finitePrefix Result has 156 conditions, 151 events. 16/151 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 411 event pairs, 0 based on Foata normal form. 0/115 useless extension candidates. Maximal degree in co-relation 82. Up to 4 conditions per place. [2023-08-26 18:49:20,770 INFO L119 LiptonReduction]: Number of co-enabled transitions 3440 [2023-08-26 18:49:23,821 INFO L134 LiptonReduction]: Checked pairs total: 7338 [2023-08-26 18:49:23,821 INFO L136 LiptonReduction]: Total number of compositions: 107 [2023-08-26 18:49:23,831 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:49:23,837 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;@93c0f8e, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:23,838 INFO L358 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2023-08-26 18:49:23,839 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:23,840 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:49:23,840 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:23,840 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:23,840 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:23,841 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-08-26 18:49:23,844 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:23,844 INFO L85 PathProgramCache]: Analyzing trace with hash 14467, now seen corresponding path program 1 times [2023-08-26 18:49:23,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:23,851 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [7054701] [2023-08-26 18:49:23,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:23,851 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:23,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:24,117 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:24,118 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:24,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [7054701] [2023-08-26 18:49:24,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [7054701] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:24,119 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:24,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:24,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130957467] [2023-08-26 18:49:24,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:24,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:24,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:24,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:24,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:24,150 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 73 out of 221 [2023-08-26 18:49:24,152 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 42 transitions, 89 flow. Second operand has 3 states, 3 states have (on average 73.66666666666667) internal successors, (221), 3 states have internal predecessors, (221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,153 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:24,153 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 73 of 221 [2023-08-26 18:49:24,153 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:24,282 INFO L124 PetriNetUnfolderBase]: 143/346 cut-off events. [2023-08-26 18:49:24,282 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:24,285 INFO L83 FinitePrefix]: Finished finitePrefix Result has 679 conditions, 346 events. 143/346 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 1910 event pairs, 0 based on Foata normal form. 12/251 useless extension candidates. Maximal degree in co-relation 638. Up to 298 conditions per place. [2023-08-26 18:49:24,289 INFO L140 encePairwiseOnDemand]: 207/221 looper letters, 39 selfloop transitions, 2 changer transitions 0/47 dead transitions. [2023-08-26 18:49:24,289 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 47 transitions, 181 flow [2023-08-26 18:49:24,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:24,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:24,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 280 transitions. [2023-08-26 18:49:24,309 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42232277526395173 [2023-08-26 18:49:24,309 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 280 transitions. [2023-08-26 18:49:24,310 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 280 transitions. [2023-08-26 18:49:24,312 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:24,314 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 280 transitions. [2023-08-26 18:49:24,318 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 18:49:24,322 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 221.0) internal successors, (884), 4 states have internal predecessors, (884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,323 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 221.0) internal successors, (884), 4 states have internal predecessors, (884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,324 INFO L175 Difference]: Start difference. First operand has 37 places, 42 transitions, 89 flow. Second operand 3 states and 280 transitions. [2023-08-26 18:49:24,325 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 47 transitions, 181 flow [2023-08-26 18:49:24,327 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 47 transitions, 181 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:49:24,328 INFO L231 Difference]: Finished difference. Result has 38 places, 32 transitions, 79 flow [2023-08-26 18:49:24,330 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=221, PETRI_DIFFERENCE_MINUEND_FLOW=69, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=32, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=30, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=79, PETRI_PLACES=38, PETRI_TRANSITIONS=32} [2023-08-26 18:49:24,333 INFO L281 CegarLoopForPetriNet]: 37 programPoint places, 1 predicate places. [2023-08-26 18:49:24,333 INFO L495 AbstractCegarLoop]: Abstraction has has 38 places, 32 transitions, 79 flow [2023-08-26 18:49:24,333 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 73.66666666666667) internal successors, (221), 3 states have internal predecessors, (221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,334 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:24,334 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:24,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 18:49:24,334 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-08-26 18:49:24,342 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:24,342 INFO L85 PathProgramCache]: Analyzing trace with hash 14466, now seen corresponding path program 1 times [2023-08-26 18:49:24,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:24,343 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580711393] [2023-08-26 18:49:24,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:24,343 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:24,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:24,422 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:24,422 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:24,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580711393] [2023-08-26 18:49:24,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580711393] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:24,423 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:24,423 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:24,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786477304] [2023-08-26 18:49:24,423 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:24,424 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:24,425 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:24,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:24,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:24,426 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 78 out of 221 [2023-08-26 18:49:24,426 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 38 places, 32 transitions, 79 flow. Second operand has 3 states, 3 states have (on average 78.66666666666667) internal successors, (236), 3 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,426 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:24,426 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 78 of 221 [2023-08-26 18:49:24,427 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:24,528 INFO L124 PetriNetUnfolderBase]: 160/357 cut-off events. [2023-08-26 18:49:24,529 INFO L125 PetriNetUnfolderBase]: For 32/32 co-relation queries the response was YES. [2023-08-26 18:49:24,530 INFO L83 FinitePrefix]: Finished finitePrefix Result has 783 conditions, 357 events. 160/357 cut-off events. For 32/32 co-relation queries the response was YES. Maximal size of possible extension queue 25. Compared 1632 event pairs, 144 based on Foata normal form. 0/238 useless extension candidates. Maximal degree in co-relation 767. Up to 316 conditions per place. [2023-08-26 18:49:24,532 INFO L140 encePairwiseOnDemand]: 218/221 looper letters, 39 selfloop transitions, 2 changer transitions 3/47 dead transitions. [2023-08-26 18:49:24,532 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 39 places, 47 transitions, 197 flow [2023-08-26 18:49:24,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:24,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:24,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 279 transitions. [2023-08-26 18:49:24,534 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42081447963800905 [2023-08-26 18:49:24,534 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 279 transitions. [2023-08-26 18:49:24,534 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 279 transitions. [2023-08-26 18:49:24,535 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:24,535 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 279 transitions. [2023-08-26 18:49:24,535 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 93.0) internal successors, (279), 3 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,538 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 221.0) internal successors, (884), 4 states have internal predecessors, (884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,539 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 221.0) internal successors, (884), 4 states have internal predecessors, (884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,539 INFO L175 Difference]: Start difference. First operand has 38 places, 32 transitions, 79 flow. Second operand 3 states and 279 transitions. [2023-08-26 18:49:24,539 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 39 places, 47 transitions, 197 flow [2023-08-26 18:49:24,540 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 47 transitions, 193 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:49:24,541 INFO L231 Difference]: Finished difference. Result has 37 places, 31 transitions, 77 flow [2023-08-26 18:49:24,541 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=221, PETRI_DIFFERENCE_MINUEND_FLOW=73, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=77, PETRI_PLACES=37, PETRI_TRANSITIONS=31} [2023-08-26 18:49:24,542 INFO L281 CegarLoopForPetriNet]: 37 programPoint places, 0 predicate places. [2023-08-26 18:49:24,542 INFO L495 AbstractCegarLoop]: Abstraction has has 37 places, 31 transitions, 77 flow [2023-08-26 18:49:24,543 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 78.66666666666667) internal successors, (236), 3 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,543 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:24,545 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 18:49:24,545 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 18:49:24,546 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-08-26 18:49:24,549 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:24,549 INFO L85 PathProgramCache]: Analyzing trace with hash 431243315, now seen corresponding path program 1 times [2023-08-26 18:49:24,550 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:24,550 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1802674004] [2023-08-26 18:49:24,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:24,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:24,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:24,709 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:24,709 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:24,709 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1802674004] [2023-08-26 18:49:24,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1802674004] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:49:24,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186031394] [2023-08-26 18:49:24,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:24,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:49:24,712 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:49:24,721 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:49:24,748 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-26 18:49:24,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:24,804 INFO L262 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:49:24,808 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:49:24,882 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:49:24,926 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:24,926 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:49:24,973 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:24,973 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1186031394] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:49:24,973 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:49:24,973 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:49:24,974 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088711363] [2023-08-26 18:49:24,974 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:49:24,974 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:49:24,974 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:24,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:49:24,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:49:24,978 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 73 out of 221 [2023-08-26 18:49:24,979 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 31 transitions, 77 flow. Second operand has 8 states, 8 states have (on average 74.875) internal successors, (599), 8 states have internal predecessors, (599), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:24,979 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:24,980 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 73 of 221 [2023-08-26 18:49:24,980 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:25,093 INFO L124 PetriNetUnfolderBase]: 26/88 cut-off events. [2023-08-26 18:49:25,094 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:25,094 INFO L83 FinitePrefix]: Finished finitePrefix Result has 194 conditions, 88 events. 26/88 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 277 event pairs, 0 based on Foata normal form. 14/93 useless extension candidates. Maximal degree in co-relation 186. Up to 54 conditions per place. [2023-08-26 18:49:25,094 INFO L140 encePairwiseOnDemand]: 217/221 looper letters, 23 selfloop transitions, 2 changer transitions 6/36 dead transitions. [2023-08-26 18:49:25,095 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 36 transitions, 143 flow [2023-08-26 18:49:25,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:49:25,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:49:25,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 325 transitions. [2023-08-26 18:49:25,096 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.36764705882352944 [2023-08-26 18:49:25,096 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 325 transitions. [2023-08-26 18:49:25,096 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 325 transitions. [2023-08-26 18:49:25,097 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:25,097 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 325 transitions. [2023-08-26 18:49:25,098 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 81.25) internal successors, (325), 4 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:25,099 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 221.0) internal successors, (1105), 5 states have internal predecessors, (1105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:25,100 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 221.0) internal successors, (1105), 5 states have internal predecessors, (1105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:25,100 INFO L175 Difference]: Start difference. First operand has 37 places, 31 transitions, 77 flow. Second operand 4 states and 325 transitions. [2023-08-26 18:49:25,100 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 36 transitions, 143 flow [2023-08-26 18:49:25,101 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 36 transitions, 140 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:49:25,101 INFO L231 Difference]: Finished difference. Result has 29 places, 19 transitions, 48 flow [2023-08-26 18:49:25,102 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=221, PETRI_DIFFERENCE_MINUEND_FLOW=50, PETRI_DIFFERENCE_MINUEND_PLACES=26, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=22, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=48, PETRI_PLACES=29, PETRI_TRANSITIONS=19} [2023-08-26 18:49:25,102 INFO L281 CegarLoopForPetriNet]: 37 programPoint places, -8 predicate places. [2023-08-26 18:49:25,103 INFO L495 AbstractCegarLoop]: Abstraction has has 29 places, 19 transitions, 48 flow [2023-08-26 18:49:25,103 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 74.875) internal successors, (599), 8 states have internal predecessors, (599), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:25,103 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:25,103 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:49:25,122 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-08-26 18:49:25,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:49:25,310 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-08-26 18:49:25,310 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:25,310 INFO L85 PathProgramCache]: Analyzing trace with hash 483619478, now seen corresponding path program 1 times [2023-08-26 18:49:25,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:25,311 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103108250] [2023-08-26 18:49:25,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:25,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:25,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:25,429 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:25,430 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:25,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103108250] [2023-08-26 18:49:25,431 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103108250] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:25,431 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:25,431 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:49:25,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79811391] [2023-08-26 18:49:25,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:25,431 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:49:25,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:25,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:49:25,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:49:25,433 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 73 out of 221 [2023-08-26 18:49:25,434 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 19 transitions, 48 flow. Second operand has 4 states, 4 states have (on average 74.25) internal successors, (297), 4 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:25,434 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:25,434 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 73 of 221 [2023-08-26 18:49:25,434 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:25,461 INFO L124 PetriNetUnfolderBase]: 22/64 cut-off events. [2023-08-26 18:49:25,461 INFO L125 PetriNetUnfolderBase]: For 11/11 co-relation queries the response was YES. [2023-08-26 18:49:25,461 INFO L83 FinitePrefix]: Finished finitePrefix Result has 145 conditions, 64 events. 22/64 cut-off events. For 11/11 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 130 event pairs, 22 based on Foata normal form. 0/55 useless extension candidates. Maximal degree in co-relation 137. Up to 60 conditions per place. [2023-08-26 18:49:25,462 INFO L140 encePairwiseOnDemand]: 218/221 looper letters, 14 selfloop transitions, 1 changer transitions 0/17 dead transitions. [2023-08-26 18:49:25,462 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 26 places, 17 transitions, 74 flow [2023-08-26 18:49:25,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:25,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:25,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 236 transitions. [2023-08-26 18:49:25,463 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3559577677224736 [2023-08-26 18:49:25,463 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 236 transitions. [2023-08-26 18:49:25,463 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 236 transitions. [2023-08-26 18:49:25,464 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:25,464 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 236 transitions. [2023-08-26 18:49:25,464 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 78.66666666666667) internal successors, (236), 3 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:25,465 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 221.0) internal successors, (884), 4 states have internal predecessors, (884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:25,466 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 221.0) internal successors, (884), 4 states have internal predecessors, (884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:25,466 INFO L175 Difference]: Start difference. First operand has 29 places, 19 transitions, 48 flow. Second operand 3 states and 236 transitions. [2023-08-26 18:49:25,466 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 26 places, 17 transitions, 74 flow [2023-08-26 18:49:25,466 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 24 places, 17 transitions, 71 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:49:25,467 INFO L231 Difference]: Finished difference. Result has 24 places, 17 transitions, 43 flow [2023-08-26 18:49:25,467 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=221, PETRI_DIFFERENCE_MINUEND_FLOW=41, PETRI_DIFFERENCE_MINUEND_PLACES=22, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=17, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=16, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=43, PETRI_PLACES=24, PETRI_TRANSITIONS=17} [2023-08-26 18:49:25,468 INFO L281 CegarLoopForPetriNet]: 37 programPoint places, -13 predicate places. [2023-08-26 18:49:25,468 INFO L495 AbstractCegarLoop]: Abstraction has has 24 places, 17 transitions, 43 flow [2023-08-26 18:49:25,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 74.25) internal successors, (297), 4 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:25,468 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:25,468 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:49:25,468 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 18:49:25,469 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-08-26 18:49:25,469 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:25,469 INFO L85 PathProgramCache]: Analyzing trace with hash 2107301106, now seen corresponding path program 1 times [2023-08-26 18:49:25,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:25,469 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643050411] [2023-08-26 18:49:25,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:25,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:25,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:25,532 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:25,532 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:25,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643050411] [2023-08-26 18:49:25,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643050411] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:25,533 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:25,533 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:49:25,533 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924889367] [2023-08-26 18:49:25,533 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:25,533 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:49:25,533 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:25,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:49:25,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:49:25,534 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 72 out of 221 [2023-08-26 18:49:25,535 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 17 transitions, 43 flow. Second operand has 4 states, 4 states have (on average 73.5) internal successors, (294), 4 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 18:49:25,535 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:25,535 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 72 of 221 [2023-08-26 18:49:25,535 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:25,568 INFO L124 PetriNetUnfolderBase]: 14/44 cut-off events. [2023-08-26 18:49:25,568 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:25,568 INFO L83 FinitePrefix]: Finished finitePrefix Result has 101 conditions, 44 events. 14/44 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 67 event pairs, 14 based on Foata normal form. 3/47 useless extension candidates. Maximal degree in co-relation 93. Up to 40 conditions per place. [2023-08-26 18:49:25,568 INFO L140 encePairwiseOnDemand]: 216/221 looper letters, 0 selfloop transitions, 0 changer transitions 13/13 dead transitions. [2023-08-26 18:49:25,569 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 13 transitions, 57 flow [2023-08-26 18:49:25,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:25,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:25,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 231 transitions. [2023-08-26 18:49:25,570 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.34841628959276016 [2023-08-26 18:49:25,570 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 231 transitions. [2023-08-26 18:49:25,570 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 231 transitions. [2023-08-26 18:49:25,570 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:25,570 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 231 transitions. [2023-08-26 18:49:25,571 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 77.0) internal successors, (231), 3 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:25,572 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 221.0) internal successors, (884), 4 states have internal predecessors, (884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:25,573 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 221.0) internal successors, (884), 4 states have internal predecessors, (884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:25,573 INFO L175 Difference]: Start difference. First operand has 24 places, 17 transitions, 43 flow. Second operand 3 states and 231 transitions. [2023-08-26 18:49:25,573 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 13 transitions, 57 flow [2023-08-26 18:49:25,573 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 13 transitions, 56 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:49:25,573 INFO L231 Difference]: Finished difference. Result has 21 places, 0 transitions, 0 flow [2023-08-26 18:49:25,573 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=221, PETRI_DIFFERENCE_MINUEND_FLOW=34, PETRI_DIFFERENCE_MINUEND_PLACES=19, 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=3, PETRI_FLOW=0, PETRI_PLACES=21, PETRI_TRANSITIONS=0} [2023-08-26 18:49:25,574 INFO L281 CegarLoopForPetriNet]: 37 programPoint places, -16 predicate places. [2023-08-26 18:49:25,574 INFO L495 AbstractCegarLoop]: Abstraction has has 21 places, 0 transitions, 0 flow [2023-08-26 18:49:25,574 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 73.5) internal successors, (294), 4 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 18:49:25,576 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 21 remaining) [2023-08-26 18:49:25,577 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 21 remaining) [2023-08-26 18:49:25,577 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 21 remaining) [2023-08-26 18:49:25,577 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 21 remaining) [2023-08-26 18:49:25,577 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONASSERT (16 of 21 remaining) [2023-08-26 18:49:25,577 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 21 remaining) [2023-08-26 18:49:25,577 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 21 remaining) [2023-08-26 18:49:25,578 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 21 remaining) [2023-08-26 18:49:25,578 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 21 remaining) [2023-08-26 18:49:25,578 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 21 remaining) [2023-08-26 18:49:25,578 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 21 remaining) [2023-08-26 18:49:25,578 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 21 remaining) [2023-08-26 18:49:25,578 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 21 remaining) [2023-08-26 18:49:25,578 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 21 remaining) [2023-08-26 18:49:25,578 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 21 remaining) [2023-08-26 18:49:25,579 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 21 remaining) [2023-08-26 18:49:25,579 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 21 remaining) [2023-08-26 18:49:25,579 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 21 remaining) [2023-08-26 18:49:25,579 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 21 remaining) [2023-08-26 18:49:25,579 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 21 remaining) [2023-08-26 18:49:25,579 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 21 remaining) [2023-08-26 18:49:25,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 18:49:25,580 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2023-08-26 18:49:25,583 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:49:25,591 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 106 places, 114 transitions, 233 flow [2023-08-26 18:49:25,606 INFO L124 PetriNetUnfolderBase]: 16/151 cut-off events. [2023-08-26 18:49:25,606 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:25,606 INFO L83 FinitePrefix]: Finished finitePrefix Result has 156 conditions, 151 events. 16/151 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 411 event pairs, 0 based on Foata normal form. 0/115 useless extension candidates. Maximal degree in co-relation 82. Up to 4 conditions per place. [2023-08-26 18:49:25,606 INFO L82 GeneralOperation]: Start removeDead. Operand has 106 places, 114 transitions, 233 flow [2023-08-26 18:49:25,607 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 106 places, 114 transitions, 233 flow [2023-08-26 18:49:25,607 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:25,608 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 106 places, 114 transitions, 233 flow [2023-08-26 18:49:25,608 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 106 places, 114 transitions, 233 flow [2023-08-26 18:49:25,608 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 106 places, 114 transitions, 233 flow [2023-08-26 18:49:25,622 INFO L124 PetriNetUnfolderBase]: 16/151 cut-off events. [2023-08-26 18:49:25,623 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:25,623 INFO L83 FinitePrefix]: Finished finitePrefix Result has 156 conditions, 151 events. 16/151 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 411 event pairs, 0 based on Foata normal form. 0/115 useless extension candidates. Maximal degree in co-relation 82. Up to 4 conditions per place. [2023-08-26 18:49:25,625 INFO L119 LiptonReduction]: Number of co-enabled transitions 3440 [2023-08-26 18:49:28,288 INFO L134 LiptonReduction]: Checked pairs total: 6705 [2023-08-26 18:49:28,288 INFO L136 LiptonReduction]: Total number of compositions: 106 [2023-08-26 18:49:28,290 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:49:28,291 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;@93c0f8e, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:28,291 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:49:28,293 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:28,294 INFO L124 PetriNetUnfolderBase]: 2/23 cut-off events. [2023-08-26 18:49:28,294 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:28,294 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:28,294 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 18:49:28,294 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:49:28,294 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:28,294 INFO L85 PathProgramCache]: Analyzing trace with hash -684176211, now seen corresponding path program 1 times [2023-08-26 18:49:28,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:28,295 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979306281] [2023-08-26 18:49:28,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:28,295 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:28,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:49:28,306 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:49:28,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:49:28,327 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:49:28,327 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:49:28,328 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:49:28,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 18:49:28,328 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:49:28,329 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:49:28,329 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:49:28,329 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 18:49:28,346 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:49:28,348 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 143 places, 155 transitions, 322 flow [2023-08-26 18:49:28,366 INFO L124 PetriNetUnfolderBase]: 27/234 cut-off events. [2023-08-26 18:49:28,366 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 18:49:28,368 INFO L83 FinitePrefix]: Finished finitePrefix Result has 244 conditions, 234 events. 27/234 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 773 event pairs, 0 based on Foata normal form. 0/173 useless extension candidates. Maximal degree in co-relation 152. Up to 6 conditions per place. [2023-08-26 18:49:28,368 INFO L82 GeneralOperation]: Start removeDead. Operand has 143 places, 155 transitions, 322 flow [2023-08-26 18:49:28,370 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 143 places, 155 transitions, 322 flow [2023-08-26 18:49:28,370 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:28,370 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 143 places, 155 transitions, 322 flow [2023-08-26 18:49:28,370 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 143 places, 155 transitions, 322 flow [2023-08-26 18:49:28,370 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 143 places, 155 transitions, 322 flow [2023-08-26 18:49:28,388 INFO L124 PetriNetUnfolderBase]: 27/234 cut-off events. [2023-08-26 18:49:28,388 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 18:49:28,390 INFO L83 FinitePrefix]: Finished finitePrefix Result has 244 conditions, 234 events. 27/234 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 773 event pairs, 0 based on Foata normal form. 0/173 useless extension candidates. Maximal degree in co-relation 152. Up to 6 conditions per place. [2023-08-26 18:49:28,395 INFO L119 LiptonReduction]: Number of co-enabled transitions 10160 [2023-08-26 18:49:31,405 INFO L134 LiptonReduction]: Checked pairs total: 25958 [2023-08-26 18:49:31,405 INFO L136 LiptonReduction]: Total number of compositions: 142 [2023-08-26 18:49:31,406 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:49:31,407 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;@93c0f8e, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:31,407 INFO L358 AbstractCegarLoop]: Starting to check reachability of 29 error locations. [2023-08-26 18:49:31,408 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:31,408 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:49:31,408 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:31,409 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:31,409 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:31,409 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-08-26 18:49:31,409 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:31,409 INFO L85 PathProgramCache]: Analyzing trace with hash 28665, now seen corresponding path program 1 times [2023-08-26 18:49:31,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:31,409 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961279865] [2023-08-26 18:49:31,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:31,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:31,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:31,462 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:31,462 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:31,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961279865] [2023-08-26 18:49:31,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961279865] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:31,463 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:31,463 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:31,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373595982] [2023-08-26 18:49:31,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:31,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:31,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:31,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:31,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:31,464 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 99 out of 297 [2023-08-26 18:49:31,465 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 60 places, 70 transitions, 152 flow. Second operand has 3 states, 3 states have (on average 99.66666666666667) internal successors, (299), 3 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:31,465 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:31,465 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 99 of 297 [2023-08-26 18:49:31,465 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:32,115 INFO L124 PetriNetUnfolderBase]: 4639/7753 cut-off events. [2023-08-26 18:49:32,116 INFO L125 PetriNetUnfolderBase]: For 37/37 co-relation queries the response was YES. [2023-08-26 18:49:32,126 INFO L83 FinitePrefix]: Finished finitePrefix Result has 15141 conditions, 7753 events. 4639/7753 cut-off events. For 37/37 co-relation queries the response was YES. Maximal size of possible extension queue 385. Compared 53377 event pairs, 4246 based on Foata normal form. 360/5726 useless extension candidates. Maximal degree in co-relation 10150. Up to 7314 conditions per place. [2023-08-26 18:49:32,167 INFO L140 encePairwiseOnDemand]: 274/297 looper letters, 55 selfloop transitions, 2 changer transitions 0/67 dead transitions. [2023-08-26 18:49:32,167 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 67 transitions, 260 flow [2023-08-26 18:49:32,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:32,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:32,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 383 transitions. [2023-08-26 18:49:32,169 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4298540965207632 [2023-08-26 18:49:32,169 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 383 transitions. [2023-08-26 18:49:32,169 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 383 transitions. [2023-08-26 18:49:32,169 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:32,169 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 383 transitions. [2023-08-26 18:49:32,171 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 127.66666666666667) internal successors, (383), 3 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,172 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 297.0) internal successors, (1188), 4 states have internal predecessors, (1188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,174 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 297.0) internal successors, (1188), 4 states have internal predecessors, (1188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,174 INFO L175 Difference]: Start difference. First operand has 60 places, 70 transitions, 152 flow. Second operand 3 states and 383 transitions. [2023-08-26 18:49:32,174 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 67 transitions, 260 flow [2023-08-26 18:49:32,176 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 58 places, 67 transitions, 258 flow, removed 1 selfloop flow, removed 0 redundant places. [2023-08-26 18:49:32,178 INFO L231 Difference]: Finished difference. Result has 59 places, 52 transitions, 126 flow [2023-08-26 18:49:32,178 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=297, PETRI_DIFFERENCE_MINUEND_FLOW=112, PETRI_DIFFERENCE_MINUEND_PLACES=56, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=51, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=49, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=126, PETRI_PLACES=59, PETRI_TRANSITIONS=52} [2023-08-26 18:49:32,179 INFO L281 CegarLoopForPetriNet]: 60 programPoint places, -1 predicate places. [2023-08-26 18:49:32,179 INFO L495 AbstractCegarLoop]: Abstraction has has 59 places, 52 transitions, 126 flow [2023-08-26 18:49:32,179 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 99.66666666666667) internal successors, (299), 3 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,179 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:32,180 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:32,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-26 18:49:32,180 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-08-26 18:49:32,180 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:32,180 INFO L85 PathProgramCache]: Analyzing trace with hash 28664, now seen corresponding path program 1 times [2023-08-26 18:49:32,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:32,180 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980488910] [2023-08-26 18:49:32,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:32,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:32,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:32,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:32,212 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:32,212 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980488910] [2023-08-26 18:49:32,212 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [980488910] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:32,212 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:32,212 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:32,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701937512] [2023-08-26 18:49:32,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:32,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:32,213 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:32,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:32,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:32,214 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 104 out of 297 [2023-08-26 18:49:32,214 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 52 transitions, 126 flow. Second operand has 3 states, 3 states have (on average 104.66666666666667) internal successors, (314), 3 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,214 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:32,214 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 104 of 297 [2023-08-26 18:49:32,214 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:32,890 INFO L124 PetriNetUnfolderBase]: 5190/8396 cut-off events. [2023-08-26 18:49:32,891 INFO L125 PetriNetUnfolderBase]: For 584/584 co-relation queries the response was YES. [2023-08-26 18:49:32,909 INFO L83 FinitePrefix]: Finished finitePrefix Result has 17474 conditions, 8396 events. 5190/8396 cut-off events. For 584/584 co-relation queries the response was YES. Maximal size of possible extension queue 393. Compared 56603 event pairs, 4695 based on Foata normal form. 0/5733 useless extension candidates. Maximal degree in co-relation 17362. Up to 7417 conditions per place. [2023-08-26 18:49:32,947 INFO L140 encePairwiseOnDemand]: 294/297 looper letters, 72 selfloop transitions, 2 changer transitions 0/81 dead transitions. [2023-08-26 18:49:32,948 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 81 transitions, 332 flow [2023-08-26 18:49:32,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:32,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:32,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 386 transitions. [2023-08-26 18:49:32,950 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4332210998877666 [2023-08-26 18:49:32,950 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 386 transitions. [2023-08-26 18:49:32,950 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 386 transitions. [2023-08-26 18:49:32,950 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:32,950 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 386 transitions. [2023-08-26 18:49:32,951 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 128.66666666666666) internal successors, (386), 3 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,952 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 297.0) internal successors, (1188), 4 states have internal predecessors, (1188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,953 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 297.0) internal successors, (1188), 4 states have internal predecessors, (1188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,953 INFO L175 Difference]: Start difference. First operand has 59 places, 52 transitions, 126 flow. Second operand 3 states and 386 transitions. [2023-08-26 18:49:32,953 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 81 transitions, 332 flow [2023-08-26 18:49:32,958 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 59 places, 81 transitions, 330 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:49:32,959 INFO L231 Difference]: Finished difference. Result has 59 places, 51 transitions, 126 flow [2023-08-26 18:49:32,959 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=297, PETRI_DIFFERENCE_MINUEND_FLOW=122, PETRI_DIFFERENCE_MINUEND_PLACES=57, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=51, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=49, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=126, PETRI_PLACES=59, PETRI_TRANSITIONS=51} [2023-08-26 18:49:32,960 INFO L281 CegarLoopForPetriNet]: 60 programPoint places, -1 predicate places. [2023-08-26 18:49:32,960 INFO L495 AbstractCegarLoop]: Abstraction has has 59 places, 51 transitions, 126 flow [2023-08-26 18:49:32,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 104.66666666666667) internal successors, (314), 3 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:32,961 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:32,961 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:49:32,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 18:49:32,961 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-08-26 18:49:32,961 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:32,961 INFO L85 PathProgramCache]: Analyzing trace with hash 726231581, now seen corresponding path program 1 times [2023-08-26 18:49:32,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:32,962 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [553639232] [2023-08-26 18:49:32,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:32,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:32,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:33,028 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:33,029 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:33,029 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [553639232] [2023-08-26 18:49:33,029 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [553639232] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:33,029 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:33,029 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:49:33,029 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283948459] [2023-08-26 18:49:33,029 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:33,030 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:49:33,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:33,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:49:33,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:49:33,031 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 95 out of 297 [2023-08-26 18:49:33,031 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 51 transitions, 126 flow. Second operand has 4 states, 4 states have (on average 96.25) internal successors, (385), 4 states have internal predecessors, (385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:33,031 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:33,031 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 95 of 297 [2023-08-26 18:49:33,031 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:33,529 INFO L124 PetriNetUnfolderBase]: 3952/6443 cut-off events. [2023-08-26 18:49:33,530 INFO L125 PetriNetUnfolderBase]: For 637/637 co-relation queries the response was YES. [2023-08-26 18:49:33,539 INFO L83 FinitePrefix]: Finished finitePrefix Result has 13603 conditions, 6443 events. 3952/6443 cut-off events. For 637/637 co-relation queries the response was YES. Maximal size of possible extension queue 283. Compared 41222 event pairs, 3575 based on Foata normal form. 319/4824 useless extension candidates. Maximal degree in co-relation 12209. Up to 5677 conditions per place. [2023-08-26 18:49:33,562 INFO L140 encePairwiseOnDemand]: 291/297 looper letters, 64 selfloop transitions, 2 changer transitions 0/73 dead transitions. [2023-08-26 18:49:33,563 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 73 transitions, 302 flow [2023-08-26 18:49:33,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:49:33,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:49:33,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 453 transitions. [2023-08-26 18:49:33,564 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3813131313131313 [2023-08-26 18:49:33,565 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 453 transitions. [2023-08-26 18:49:33,565 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 453 transitions. [2023-08-26 18:49:33,565 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:33,565 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 453 transitions. [2023-08-26 18:49:33,566 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 113.25) internal successors, (453), 4 states have internal predecessors, (453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:33,567 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 297.0) internal successors, (1485), 5 states have internal predecessors, (1485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:33,568 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 297.0) internal successors, (1485), 5 states have internal predecessors, (1485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:33,568 INFO L175 Difference]: Start difference. First operand has 59 places, 51 transitions, 126 flow. Second operand 4 states and 453 transitions. [2023-08-26 18:49:33,568 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 73 transitions, 302 flow [2023-08-26 18:49:33,570 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 56 places, 73 transitions, 298 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:49:33,571 INFO L231 Difference]: Finished difference. Result has 56 places, 47 transitions, 118 flow [2023-08-26 18:49:33,572 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=297, PETRI_DIFFERENCE_MINUEND_FLOW=114, PETRI_DIFFERENCE_MINUEND_PLACES=53, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=47, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=45, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=118, PETRI_PLACES=56, PETRI_TRANSITIONS=47} [2023-08-26 18:49:33,572 INFO L281 CegarLoopForPetriNet]: 60 programPoint places, -4 predicate places. [2023-08-26 18:49:33,572 INFO L495 AbstractCegarLoop]: Abstraction has has 56 places, 47 transitions, 118 flow [2023-08-26 18:49:33,573 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 96.25) internal successors, (385), 4 states have internal predecessors, (385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:33,573 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:33,573 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:49:33,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 18:49:33,573 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-08-26 18:49:33,573 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:33,573 INFO L85 PathProgramCache]: Analyzing trace with hash 726017889, now seen corresponding path program 1 times [2023-08-26 18:49:33,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:33,574 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068553899] [2023-08-26 18:49:33,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:33,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:33,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:33,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:33,629 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:33,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068553899] [2023-08-26 18:49:33,629 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068553899] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:49:33,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191417369] [2023-08-26 18:49:33,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:33,630 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:49:33,630 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:49:33,631 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 18:49:33,637 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-26 18:49:33,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:33,693 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:49:33,694 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:49:33,702 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:49:33,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:33,742 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:49:33,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:33,788 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191417369] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:49:33,789 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:49:33,789 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:49:33,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295090138] [2023-08-26 18:49:33,789 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:49:33,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:49:33,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:33,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:49:33,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:49:33,791 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 99 out of 297 [2023-08-26 18:49:33,791 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 56 places, 47 transitions, 118 flow. Second operand has 8 states, 8 states have (on average 100.875) internal successors, (807), 8 states have internal predecessors, (807), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:33,791 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:33,792 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 99 of 297 [2023-08-26 18:49:33,792 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:34,033 INFO L124 PetriNetUnfolderBase]: 739/1454 cut-off events. [2023-08-26 18:49:34,034 INFO L125 PetriNetUnfolderBase]: For 180/180 co-relation queries the response was YES. [2023-08-26 18:49:34,037 INFO L83 FinitePrefix]: Finished finitePrefix Result has 3069 conditions, 1454 events. 739/1454 cut-off events. For 180/180 co-relation queries the response was YES. Maximal size of possible extension queue 81. Compared 8645 event pairs, 0 based on Foata normal form. 168/1429 useless extension candidates. Maximal degree in co-relation 3059. Up to 886 conditions per place. [2023-08-26 18:49:34,041 INFO L140 encePairwiseOnDemand]: 293/297 looper letters, 62 selfloop transitions, 3 changer transitions 0/74 dead transitions. [2023-08-26 18:49:34,042 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 50 places, 74 transitions, 296 flow [2023-08-26 18:49:34,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 18:49:34,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 18:49:34,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 564 transitions. [2023-08-26 18:49:34,044 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3797979797979798 [2023-08-26 18:49:34,044 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 564 transitions. [2023-08-26 18:49:34,044 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 564 transitions. [2023-08-26 18:49:34,045 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:34,045 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 564 transitions. [2023-08-26 18:49:34,046 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 112.8) internal successors, (564), 5 states have internal predecessors, (564), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,048 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 297.0) internal successors, (1782), 6 states have internal predecessors, (1782), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,048 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 297.0) internal successors, (1782), 6 states have internal predecessors, (1782), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,048 INFO L175 Difference]: Start difference. First operand has 56 places, 47 transitions, 118 flow. Second operand 5 states and 564 transitions. [2023-08-26 18:49:34,049 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 50 places, 74 transitions, 296 flow [2023-08-26 18:49:34,049 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 49 places, 74 transitions, 295 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:49:34,051 INFO L231 Difference]: Finished difference. Result has 49 places, 38 transitions, 99 flow [2023-08-26 18:49:34,051 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=297, PETRI_DIFFERENCE_MINUEND_FLOW=93, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=38, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=35, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=99, PETRI_PLACES=49, PETRI_TRANSITIONS=38} [2023-08-26 18:49:34,052 INFO L281 CegarLoopForPetriNet]: 60 programPoint places, -11 predicate places. [2023-08-26 18:49:34,052 INFO L495 AbstractCegarLoop]: Abstraction has has 49 places, 38 transitions, 99 flow [2023-08-26 18:49:34,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 100.875) internal successors, (807), 8 states have internal predecessors, (807), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,053 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:34,053 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:49:34,061 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-26 18:49:34,258 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,SelfDestructingSolverStorable9 [2023-08-26 18:49:34,259 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-08-26 18:49:34,259 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:34,259 INFO L85 PathProgramCache]: Analyzing trace with hash 1038338486, now seen corresponding path program 1 times [2023-08-26 18:49:34,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:34,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546042710] [2023-08-26 18:49:34,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:34,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:34,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:34,333 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:34,333 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:34,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546042710] [2023-08-26 18:49:34,333 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546042710] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:34,334 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:34,334 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:49:34,334 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790080331] [2023-08-26 18:49:34,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:34,334 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:49:34,334 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:34,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:49:34,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:49:34,336 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 94 out of 297 [2023-08-26 18:49:34,336 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 38 transitions, 99 flow. Second operand has 4 states, 4 states have (on average 95.25) internal successors, (381), 4 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,336 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:34,336 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 94 of 297 [2023-08-26 18:49:34,336 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:34,441 INFO L124 PetriNetUnfolderBase]: 468/846 cut-off events. [2023-08-26 18:49:34,441 INFO L125 PetriNetUnfolderBase]: For 358/358 co-relation queries the response was YES. [2023-08-26 18:49:34,443 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1910 conditions, 846 events. 468/846 cut-off events. For 358/358 co-relation queries the response was YES. Maximal size of possible extension queue 39. Compared 3881 event pairs, 468 based on Foata normal form. 0/838 useless extension candidates. Maximal degree in co-relation 1899. Up to 800 conditions per place. [2023-08-26 18:49:34,444 INFO L140 encePairwiseOnDemand]: 288/297 looper letters, 0 selfloop transitions, 0 changer transitions 30/30 dead transitions. [2023-08-26 18:49:34,444 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 43 places, 30 transitions, 131 flow [2023-08-26 18:49:34,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:34,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:34,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 313 transitions. [2023-08-26 18:49:34,446 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.35129068462401797 [2023-08-26 18:49:34,446 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 313 transitions. [2023-08-26 18:49:34,446 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 313 transitions. [2023-08-26 18:49:34,447 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:34,447 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 313 transitions. [2023-08-26 18:49:34,447 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 104.33333333333333) internal successors, (313), 3 states have internal predecessors, (313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,449 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 297.0) internal successors, (1188), 4 states have internal predecessors, (1188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,449 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 297.0) internal successors, (1188), 4 states have internal predecessors, (1188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,449 INFO L175 Difference]: Start difference. First operand has 49 places, 38 transitions, 99 flow. Second operand 3 states and 313 transitions. [2023-08-26 18:49:34,449 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 43 places, 30 transitions, 131 flow [2023-08-26 18:49:34,450 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 40 places, 30 transitions, 124 flow, removed 1 selfloop flow, removed 3 redundant places. [2023-08-26 18:49:34,451 INFO L231 Difference]: Finished difference. Result has 40 places, 0 transitions, 0 flow [2023-08-26 18:49:34,451 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=297, PETRI_DIFFERENCE_MINUEND_FLOW=76, PETRI_DIFFERENCE_MINUEND_PLACES=38, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=30, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=40, PETRI_TRANSITIONS=0} [2023-08-26 18:49:34,452 INFO L281 CegarLoopForPetriNet]: 60 programPoint places, -20 predicate places. [2023-08-26 18:49:34,452 INFO L495 AbstractCegarLoop]: Abstraction has has 40 places, 0 transitions, 0 flow [2023-08-26 18:49:34,452 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 95.25) internal successors, (381), 4 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:34,453 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (28 of 29 remaining) [2023-08-26 18:49:34,453 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (27 of 29 remaining) [2023-08-26 18:49:34,453 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (26 of 29 remaining) [2023-08-26 18:49:34,453 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (25 of 29 remaining) [2023-08-26 18:49:34,453 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (24 of 29 remaining) [2023-08-26 18:49:34,453 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 29 remaining) [2023-08-26 18:49:34,453 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 29 remaining) [2023-08-26 18:49:34,454 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 29 remaining) [2023-08-26 18:49:34,454 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 29 remaining) [2023-08-26 18:49:34,454 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 29 remaining) [2023-08-26 18:49:34,454 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 29 remaining) [2023-08-26 18:49:34,454 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 29 remaining) [2023-08-26 18:49:34,454 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 29 remaining) [2023-08-26 18:49:34,455 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 29 remaining) [2023-08-26 18:49:34,455 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 29 remaining) [2023-08-26 18:49:34,455 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 29 remaining) [2023-08-26 18:49:34,455 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 29 remaining) [2023-08-26 18:49:34,455 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 29 remaining) [2023-08-26 18:49:34,455 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 29 remaining) [2023-08-26 18:49:34,455 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 29 remaining) [2023-08-26 18:49:34,455 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 29 remaining) [2023-08-26 18:49:34,455 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONASSERT (7 of 29 remaining) [2023-08-26 18:49:34,455 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 29 remaining) [2023-08-26 18:49:34,456 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 29 remaining) [2023-08-26 18:49:34,456 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 29 remaining) [2023-08-26 18:49:34,456 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 29 remaining) [2023-08-26 18:49:34,456 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 29 remaining) [2023-08-26 18:49:34,456 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 29 remaining) [2023-08-26 18:49:34,456 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 29 remaining) [2023-08-26 18:49:34,456 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-08-26 18:49:34,456 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2023-08-26 18:49:34,457 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:49:34,459 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 143 places, 155 transitions, 322 flow [2023-08-26 18:49:34,485 INFO L124 PetriNetUnfolderBase]: 27/234 cut-off events. [2023-08-26 18:49:34,485 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 18:49:34,486 INFO L83 FinitePrefix]: Finished finitePrefix Result has 244 conditions, 234 events. 27/234 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 773 event pairs, 0 based on Foata normal form. 0/173 useless extension candidates. Maximal degree in co-relation 152. Up to 6 conditions per place. [2023-08-26 18:49:34,486 INFO L82 GeneralOperation]: Start removeDead. Operand has 143 places, 155 transitions, 322 flow [2023-08-26 18:49:34,488 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 143 places, 155 transitions, 322 flow [2023-08-26 18:49:34,488 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:34,488 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 143 places, 155 transitions, 322 flow [2023-08-26 18:49:34,488 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 143 places, 155 transitions, 322 flow [2023-08-26 18:49:34,488 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 143 places, 155 transitions, 322 flow [2023-08-26 18:49:34,511 INFO L124 PetriNetUnfolderBase]: 27/234 cut-off events. [2023-08-26 18:49:34,511 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 18:49:34,512 INFO L83 FinitePrefix]: Finished finitePrefix Result has 244 conditions, 234 events. 27/234 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 773 event pairs, 0 based on Foata normal form. 0/173 useless extension candidates. Maximal degree in co-relation 152. Up to 6 conditions per place. [2023-08-26 18:49:34,518 INFO L119 LiptonReduction]: Number of co-enabled transitions 10160 [2023-08-26 18:49:37,564 INFO L134 LiptonReduction]: Checked pairs total: 26066 [2023-08-26 18:49:37,564 INFO L136 LiptonReduction]: Total number of compositions: 138 [2023-08-26 18:49:37,566 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:49:37,566 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;@93c0f8e, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:37,566 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:49:37,571 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:37,572 INFO L124 PetriNetUnfolderBase]: 12/75 cut-off events. [2023-08-26 18:49:37,572 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 18:49:37,572 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:37,572 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 18:49:37,572 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:49:37,572 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:37,572 INFO L85 PathProgramCache]: Analyzing trace with hash 1082427521, now seen corresponding path program 1 times [2023-08-26 18:49:37,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:37,573 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043469950] [2023-08-26 18:49:37,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:37,573 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:37,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:49:37,593 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:49:37,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:49:37,609 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:49:37,609 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:49:37,609 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:49:37,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 18:49:37,610 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:49:37,610 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:49:37,610 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:49:37,611 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 18:49:37,633 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:49:37,637 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 180 places, 196 transitions, 413 flow [2023-08-26 18:49:37,662 INFO L124 PetriNetUnfolderBase]: 38/317 cut-off events. [2023-08-26 18:49:37,662 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 18:49:37,664 INFO L83 FinitePrefix]: Finished finitePrefix Result has 333 conditions, 317 events. 38/317 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1122 event pairs, 0 based on Foata normal form. 0/231 useless extension candidates. Maximal degree in co-relation 238. Up to 8 conditions per place. [2023-08-26 18:49:37,664 INFO L82 GeneralOperation]: Start removeDead. Operand has 180 places, 196 transitions, 413 flow [2023-08-26 18:49:37,666 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 180 places, 196 transitions, 413 flow [2023-08-26 18:49:37,666 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:37,666 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 180 places, 196 transitions, 413 flow [2023-08-26 18:49:37,667 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 180 places, 196 transitions, 413 flow [2023-08-26 18:49:37,667 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 180 places, 196 transitions, 413 flow [2023-08-26 18:49:37,691 INFO L124 PetriNetUnfolderBase]: 38/317 cut-off events. [2023-08-26 18:49:37,691 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 18:49:37,693 INFO L83 FinitePrefix]: Finished finitePrefix Result has 333 conditions, 317 events. 38/317 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1122 event pairs, 0 based on Foata normal form. 0/231 useless extension candidates. Maximal degree in co-relation 238. Up to 8 conditions per place. [2023-08-26 18:49:37,705 INFO L119 LiptonReduction]: Number of co-enabled transitions 20160 [2023-08-26 18:49:40,908 INFO L134 LiptonReduction]: Checked pairs total: 55641 [2023-08-26 18:49:40,909 INFO L136 LiptonReduction]: Total number of compositions: 169 [2023-08-26 18:49:40,910 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:49:40,910 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;@93c0f8e, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:40,910 INFO L358 AbstractCegarLoop]: Starting to check reachability of 37 error locations. [2023-08-26 18:49:40,911 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:40,911 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:49:40,911 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:40,911 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:40,912 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:40,912 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 34 more)] === [2023-08-26 18:49:40,912 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:40,912 INFO L85 PathProgramCache]: Analyzing trace with hash 46085, now seen corresponding path program 1 times [2023-08-26 18:49:40,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:40,912 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233165824] [2023-08-26 18:49:40,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:40,912 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:40,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:40,977 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:40,977 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:40,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233165824] [2023-08-26 18:49:40,978 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233165824] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:40,978 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:40,978 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:40,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749483366] [2023-08-26 18:49:40,978 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:40,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:40,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:40,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:40,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:40,979 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 125 out of 365 [2023-08-26 18:49:40,980 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 82 places, 95 transitions, 211 flow. Second operand has 3 states, 3 states have (on average 125.66666666666667) internal successors, (377), 3 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:40,980 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:40,980 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 125 of 365 [2023-08-26 18:49:40,980 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:49,864 INFO L124 PetriNetUnfolderBase]: 107371/152432 cut-off events. [2023-08-26 18:49:49,864 INFO L125 PetriNetUnfolderBase]: For 1376/1376 co-relation queries the response was YES. [2023-08-26 18:49:50,103 INFO L83 FinitePrefix]: Finished finitePrefix Result has 301294 conditions, 152432 events. 107371/152432 cut-off events. For 1376/1376 co-relation queries the response was YES. Maximal size of possible extension queue 4720. Compared 1166952 event pairs, 101961 based on Foata normal form. 8100/113650 useless extension candidates. Maximal degree in co-relation 116367. Up to 147857 conditions per place. [2023-08-26 18:49:51,120 INFO L140 encePairwiseOnDemand]: 335/365 looper letters, 71 selfloop transitions, 2 changer transitions 0/86 dead transitions. [2023-08-26 18:49:51,121 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 86 transitions, 339 flow [2023-08-26 18:49:51,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:49:51,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:49:51,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 484 transitions. [2023-08-26 18:49:51,124 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4420091324200913 [2023-08-26 18:49:51,124 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 484 transitions. [2023-08-26 18:49:51,124 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 484 transitions. [2023-08-26 18:49:51,125 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:51,125 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 484 transitions. [2023-08-26 18:49:51,127 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 161.33333333333334) internal successors, (484), 3 states have internal predecessors, (484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:51,129 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 365.0) internal successors, (1460), 4 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:51,129 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 365.0) internal successors, (1460), 4 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:51,129 INFO L175 Difference]: Start difference. First operand has 82 places, 95 transitions, 211 flow. Second operand 3 states and 484 transitions. [2023-08-26 18:49:51,130 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 86 transitions, 339 flow [2023-08-26 18:49:51,132 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 78 places, 86 transitions, 333 flow, removed 3 selfloop flow, removed 0 redundant places. [2023-08-26 18:49:51,134 INFO L231 Difference]: Finished difference. Result has 79 places, 70 transitions, 167 flow [2023-08-26 18:49:51,134 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=365, PETRI_DIFFERENCE_MINUEND_FLOW=153, PETRI_DIFFERENCE_MINUEND_PLACES=76, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=69, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=67, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=167, PETRI_PLACES=79, PETRI_TRANSITIONS=70} [2023-08-26 18:49:51,135 INFO L281 CegarLoopForPetriNet]: 82 programPoint places, -3 predicate places. [2023-08-26 18:49:51,135 INFO L495 AbstractCegarLoop]: Abstraction has has 79 places, 70 transitions, 167 flow [2023-08-26 18:49:51,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 125.66666666666667) internal successors, (377), 3 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:51,135 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:51,135 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:51,136 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 18:49:51,136 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 34 more)] === [2023-08-26 18:49:51,136 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:51,136 INFO L85 PathProgramCache]: Analyzing trace with hash 46086, now seen corresponding path program 1 times [2023-08-26 18:49:51,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:51,136 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157434641] [2023-08-26 18:49:51,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:51,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:51,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:51,157 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:51,157 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:51,157 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157434641] [2023-08-26 18:49:51,158 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [157434641] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:51,158 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:51,158 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:51,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463194829] [2023-08-26 18:49:51,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:51,160 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:51,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:51,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:51,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:51,161 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 130 out of 365 [2023-08-26 18:49:51,162 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 70 transitions, 167 flow. Second operand has 3 states, 3 states have (on average 130.66666666666666) internal successors, (392), 3 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:49:51,162 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:51,162 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 130 of 365 [2023-08-26 18:49:51,162 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:50:01,747 INFO L124 PetriNetUnfolderBase]: 128070/179967 cut-off events. [2023-08-26 18:50:01,747 INFO L125 PetriNetUnfolderBase]: For 9494/9494 co-relation queries the response was YES. [2023-08-26 18:50:02,075 INFO L83 FinitePrefix]: Finished finitePrefix Result has 370073 conditions, 179967 events. 128070/179967 cut-off events. For 9494/9494 co-relation queries the response was YES. Maximal size of possible extension queue 5681. Compared 1386251 event pairs, 116055 based on Foata normal form. 0/122216 useless extension candidates. Maximal degree in co-relation 369960. Up to 159737 conditions per place. [2023-08-26 18:50:02,729 INFO L140 encePairwiseOnDemand]: 362/365 looper letters, 103 selfloop transitions, 2 changer transitions 0/114 dead transitions. [2023-08-26 18:50:02,729 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 114 transitions, 465 flow [2023-08-26 18:50:02,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:50:02,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:50:02,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 495 transitions. [2023-08-26 18:50:02,731 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4520547945205479 [2023-08-26 18:50:02,731 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 495 transitions. [2023-08-26 18:50:02,731 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 495 transitions. [2023-08-26 18:50:02,732 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:50:02,732 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 495 transitions. [2023-08-26 18:50:02,733 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 165.0) internal successors, (495), 3 states have internal predecessors, (495), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:02,734 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 365.0) internal successors, (1460), 4 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:02,735 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 365.0) internal successors, (1460), 4 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:02,735 INFO L175 Difference]: Start difference. First operand has 79 places, 70 transitions, 167 flow. Second operand 3 states and 495 transitions. [2023-08-26 18:50:02,735 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 80 places, 114 transitions, 465 flow [2023-08-26 18:50:02,742 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 114 transitions, 463 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:50:02,743 INFO L231 Difference]: Finished difference. Result has 79 places, 69 transitions, 167 flow [2023-08-26 18:50:02,743 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=365, PETRI_DIFFERENCE_MINUEND_FLOW=163, PETRI_DIFFERENCE_MINUEND_PLACES=77, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=69, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=67, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=167, PETRI_PLACES=79, PETRI_TRANSITIONS=69} [2023-08-26 18:50:02,744 INFO L281 CegarLoopForPetriNet]: 82 programPoint places, -3 predicate places. [2023-08-26 18:50:02,744 INFO L495 AbstractCegarLoop]: Abstraction has has 79 places, 69 transitions, 167 flow [2023-08-26 18:50:02,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 130.66666666666666) internal successors, (392), 3 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:02,744 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:02,744 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:50:02,745 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-26 18:50:02,745 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 34 more)] === [2023-08-26 18:50:02,745 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:02,745 INFO L85 PathProgramCache]: Analyzing trace with hash -351848600, now seen corresponding path program 1 times [2023-08-26 18:50:02,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:02,745 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314394907] [2023-08-26 18:50:02,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:02,746 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:02,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:02,810 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:50:02,810 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:50:02,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314394907] [2023-08-26 18:50:02,810 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [314394907] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:50:02,810 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:50:02,810 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:50:02,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336007134] [2023-08-26 18:50:02,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:50:02,812 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:50:02,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:50:02,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:50:02,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:50:02,813 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 117 out of 365 [2023-08-26 18:50:02,814 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 69 transitions, 167 flow. Second operand has 4 states, 4 states have (on average 118.25) internal successors, (473), 4 states have internal predecessors, (473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:02,814 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:50:02,814 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 117 of 365 [2023-08-26 18:50:02,814 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:50:09,574 INFO L124 PetriNetUnfolderBase]: 85488/120771 cut-off events. [2023-08-26 18:50:09,574 INFO L125 PetriNetUnfolderBase]: For 9401/9401 co-relation queries the response was YES. [2023-08-26 18:50:09,774 INFO L83 FinitePrefix]: Finished finitePrefix Result has 251236 conditions, 120771 events. 85488/120771 cut-off events. For 9401/9401 co-relation queries the response was YES. Maximal size of possible extension queue 3597. Compared 888730 event pairs, 77467 based on Foata normal form. 6787/91046 useless extension candidates. Maximal degree in co-relation 226321. Up to 107009 conditions per place. [2023-08-26 18:50:10,139 INFO L140 encePairwiseOnDemand]: 357/365 looper letters, 91 selfloop transitions, 2 changer transitions 0/102 dead transitions. [2023-08-26 18:50:10,139 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 76 places, 102 transitions, 419 flow [2023-08-26 18:50:10,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:50:10,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:50:10,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 572 transitions. [2023-08-26 18:50:10,141 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3917808219178082 [2023-08-26 18:50:10,141 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 572 transitions. [2023-08-26 18:50:10,141 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 572 transitions. [2023-08-26 18:50:10,142 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:50:10,142 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 572 transitions. [2023-08-26 18:50:10,143 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 143.0) internal successors, (572), 4 states have internal predecessors, (572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:10,145 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 365.0) internal successors, (1825), 5 states have internal predecessors, (1825), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:10,145 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 365.0) internal successors, (1825), 5 states have internal predecessors, (1825), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:10,145 INFO L175 Difference]: Start difference. First operand has 79 places, 69 transitions, 167 flow. Second operand 4 states and 572 transitions. [2023-08-26 18:50:10,145 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 76 places, 102 transitions, 419 flow [2023-08-26 18:50:10,182 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 102 transitions, 415 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:50:10,183 INFO L231 Difference]: Finished difference. Result has 74 places, 63 transitions, 155 flow [2023-08-26 18:50:10,183 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=365, PETRI_DIFFERENCE_MINUEND_FLOW=151, PETRI_DIFFERENCE_MINUEND_PLACES=71, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=63, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=61, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=155, PETRI_PLACES=74, PETRI_TRANSITIONS=63} [2023-08-26 18:50:10,184 INFO L281 CegarLoopForPetriNet]: 82 programPoint places, -8 predicate places. [2023-08-26 18:50:10,184 INFO L495 AbstractCegarLoop]: Abstraction has has 74 places, 63 transitions, 155 flow [2023-08-26 18:50:10,184 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 118.25) internal successors, (473), 4 states have internal predecessors, (473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:10,184 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:10,184 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:50:10,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-26 18:50:10,184 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 34 more)] === [2023-08-26 18:50:10,185 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:10,185 INFO L85 PathProgramCache]: Analyzing trace with hash -352115071, now seen corresponding path program 1 times [2023-08-26 18:50:10,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:10,185 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123688420] [2023-08-26 18:50:10,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:10,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:10,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:10,242 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:50:10,243 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:50:10,243 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123688420] [2023-08-26 18:50:10,243 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123688420] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:50:10,243 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [75334500] [2023-08-26 18:50:10,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:10,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:50:10,243 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:50:10,244 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 18:50:10,246 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 18:50:10,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:10,310 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:50:10,311 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:50:10,322 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 18:50:10,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:50:10,354 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:50:10,389 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:50:10,390 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [75334500] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:50:10,390 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:50:10,390 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:50:10,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517947772] [2023-08-26 18:50:10,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:50:10,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:50:10,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:50:10,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:50:10,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:50:10,392 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 125 out of 365 [2023-08-26 18:50:10,393 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 74 places, 63 transitions, 155 flow. Second operand has 8 states, 8 states have (on average 126.875) internal successors, (1015), 8 states have internal predecessors, (1015), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:10,393 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:50:10,393 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 125 of 365 [2023-08-26 18:50:10,393 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:50:14,819 INFO L124 PetriNetUnfolderBase]: 56909/83664 cut-off events. [2023-08-26 18:50:14,820 INFO L125 PetriNetUnfolderBase]: For 2395/2395 co-relation queries the response was YES. [2023-08-26 18:50:14,973 INFO L83 FinitePrefix]: Finished finitePrefix Result has 171565 conditions, 83664 events. 56909/83664 cut-off events. For 2395/2395 co-relation queries the response was YES. Maximal size of possible extension queue 2570. Compared 660339 event pairs, 143 based on Foata normal form. 13/65937 useless extension candidates. Maximal degree in co-relation 153222. Up to 56519 conditions per place. [2023-08-26 18:50:15,237 INFO L140 encePairwiseOnDemand]: 361/365 looper letters, 153 selfloop transitions, 6 changer transitions 0/172 dead transitions. [2023-08-26 18:50:15,237 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 172 transitions, 693 flow [2023-08-26 18:50:15,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:50:15,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:50:15,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 913 transitions. [2023-08-26 18:50:15,395 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4168949771689498 [2023-08-26 18:50:15,395 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 913 transitions. [2023-08-26 18:50:15,395 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 913 transitions. [2023-08-26 18:50:15,395 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:50:15,395 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 913 transitions. [2023-08-26 18:50:15,397 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 152.16666666666666) internal successors, (913), 6 states have internal predecessors, (913), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:15,400 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 365.0) internal successors, (2555), 7 states have internal predecessors, (2555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:15,400 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 365.0) internal successors, (2555), 7 states have internal predecessors, (2555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:15,400 INFO L175 Difference]: Start difference. First operand has 74 places, 63 transitions, 155 flow. Second operand 6 states and 913 transitions. [2023-08-26 18:50:15,400 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 172 transitions, 693 flow [2023-08-26 18:50:16,168 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 76 places, 172 transitions, 690 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:50:16,169 INFO L231 Difference]: Finished difference. Result has 76 places, 64 transitions, 168 flow [2023-08-26 18:50:16,170 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=365, PETRI_DIFFERENCE_MINUEND_FLOW=148, PETRI_DIFFERENCE_MINUEND_PLACES=71, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=62, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=58, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=168, PETRI_PLACES=76, PETRI_TRANSITIONS=64} [2023-08-26 18:50:16,170 INFO L281 CegarLoopForPetriNet]: 82 programPoint places, -6 predicate places. [2023-08-26 18:50:16,170 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 64 transitions, 168 flow [2023-08-26 18:50:16,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 126.875) internal successors, (1015), 8 states have internal predecessors, (1015), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:16,171 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:16,171 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:50:16,175 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 18:50:16,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:50:16,375 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 34 more)] === [2023-08-26 18:50:16,376 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:16,376 INFO L85 PathProgramCache]: Analyzing trace with hash 1977592236, now seen corresponding path program 1 times [2023-08-26 18:50:16,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:16,376 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570862743] [2023-08-26 18:50:16,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:16,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:16,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:16,443 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:50:16,443 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:50:16,443 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570862743] [2023-08-26 18:50:16,443 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570862743] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:50:16,443 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:50:16,443 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:50:16,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143033271] [2023-08-26 18:50:16,444 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:50:16,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:50:16,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:50:16,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:50:16,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:50:16,445 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 116 out of 365 [2023-08-26 18:50:16,446 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 64 transitions, 168 flow. Second operand has 4 states, 4 states have (on average 117.25) internal successors, (469), 4 states have internal predecessors, (469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:16,446 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:50:16,446 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 116 of 365 [2023-08-26 18:50:16,446 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:50:19,396 INFO L124 PetriNetUnfolderBase]: 33674/50599 cut-off events. [2023-08-26 18:50:19,396 INFO L125 PetriNetUnfolderBase]: For 6889/6889 co-relation queries the response was YES. [2023-08-26 18:50:19,476 INFO L83 FinitePrefix]: Finished finitePrefix Result has 105628 conditions, 50599 events. 33674/50599 cut-off events. For 6889/6889 co-relation queries the response was YES. Maximal size of possible extension queue 1461. Compared 369702 event pairs, 25572 based on Foata normal form. 0/45762 useless extension candidates. Maximal degree in co-relation 83545. Up to 34880 conditions per place. [2023-08-26 18:50:19,597 INFO L140 encePairwiseOnDemand]: 339/365 looper letters, 95 selfloop transitions, 14 changer transitions 1/118 dead transitions. [2023-08-26 18:50:19,597 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 79 places, 118 transitions, 494 flow [2023-08-26 18:50:19,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:50:19,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:50:19,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 594 transitions. [2023-08-26 18:50:19,599 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.40684931506849314 [2023-08-26 18:50:19,599 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 594 transitions. [2023-08-26 18:50:19,600 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 594 transitions. [2023-08-26 18:50:19,600 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:50:19,600 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 594 transitions. [2023-08-26 18:50:19,601 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 148.5) internal successors, (594), 4 states have internal predecessors, (594), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:19,603 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 365.0) internal successors, (1825), 5 states have internal predecessors, (1825), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:19,604 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 365.0) internal successors, (1825), 5 states have internal predecessors, (1825), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:19,604 INFO L175 Difference]: Start difference. First operand has 76 places, 64 transitions, 168 flow. Second operand 4 states and 594 transitions. [2023-08-26 18:50:19,604 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 79 places, 118 transitions, 494 flow [2023-08-26 18:50:19,608 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 76 places, 118 transitions, 479 flow, removed 4 selfloop flow, removed 3 redundant places. [2023-08-26 18:50:19,610 INFO L231 Difference]: Finished difference. Result has 79 places, 75 transitions, 301 flow [2023-08-26 18:50:19,610 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=365, PETRI_DIFFERENCE_MINUEND_FLOW=153, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=64, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=50, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=301, PETRI_PLACES=79, PETRI_TRANSITIONS=75} [2023-08-26 18:50:19,610 INFO L281 CegarLoopForPetriNet]: 82 programPoint places, -3 predicate places. [2023-08-26 18:50:19,610 INFO L495 AbstractCegarLoop]: Abstraction has has 79 places, 75 transitions, 301 flow [2023-08-26 18:50:19,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 117.25) internal successors, (469), 4 states have internal predecessors, (469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:19,611 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:19,611 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1] [2023-08-26 18:50:19,611 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-26 18:50:19,611 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 34 more)] === [2023-08-26 18:50:19,611 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:19,611 INFO L85 PathProgramCache]: Analyzing trace with hash 2008908187, now seen corresponding path program 1 times [2023-08-26 18:50:19,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:19,611 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094625511] [2023-08-26 18:50:19,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:19,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:19,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:19,649 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 18:50:19,649 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:50:19,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094625511] [2023-08-26 18:50:19,649 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094625511] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:50:19,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003562837] [2023-08-26 18:50:19,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:19,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:50:19,650 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:50:19,656 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 18:50:19,657 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 18:50:19,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:19,757 INFO L262 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:50:19,759 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:50:19,780 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 18:50:19,780 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:50:19,816 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 18:50:19,817 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003562837] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:50:19,817 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:50:19,817 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-08-26 18:50:19,817 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234964092] [2023-08-26 18:50:19,817 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:50:19,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-08-26 18:50:19,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:50:19,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-08-26 18:50:19,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2023-08-26 18:50:19,819 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 160 out of 365 [2023-08-26 18:50:19,821 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 75 transitions, 301 flow. Second operand has 9 states, 9 states have (on average 162.33333333333334) internal successors, (1461), 9 states have internal predecessors, (1461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:19,821 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:50:19,821 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 160 of 365 [2023-08-26 18:50:19,821 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:50:20,625 INFO L124 PetriNetUnfolderBase]: 7285/10894 cut-off events. [2023-08-26 18:50:20,625 INFO L125 PetriNetUnfolderBase]: For 4143/4413 co-relation queries the response was YES. [2023-08-26 18:50:20,646 INFO L83 FinitePrefix]: Finished finitePrefix Result has 26352 conditions, 10894 events. 7285/10894 cut-off events. For 4143/4413 co-relation queries the response was YES. Maximal size of possible extension queue 347. Compared 65172 event pairs, 224 based on Foata normal form. 1079/11807 useless extension candidates. Maximal degree in co-relation 26344. Up to 7161 conditions per place. [2023-08-26 18:50:20,654 INFO L140 encePairwiseOnDemand]: 362/365 looper letters, 0 selfloop transitions, 0 changer transitions 95/95 dead transitions. [2023-08-26 18:50:20,654 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 61 places, 95 transitions, 450 flow [2023-08-26 18:50:20,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:50:20,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:50:20,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1048 transitions. [2023-08-26 18:50:20,657 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4785388127853881 [2023-08-26 18:50:20,657 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1048 transitions. [2023-08-26 18:50:20,657 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1048 transitions. [2023-08-26 18:50:20,658 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:50:20,658 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1048 transitions. [2023-08-26 18:50:20,660 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 174.66666666666666) internal successors, (1048), 6 states have internal predecessors, (1048), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:20,663 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 365.0) internal successors, (2555), 7 states have internal predecessors, (2555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:20,663 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 365.0) internal successors, (2555), 7 states have internal predecessors, (2555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:20,663 INFO L175 Difference]: Start difference. First operand has 79 places, 75 transitions, 301 flow. Second operand 6 states and 1048 transitions. [2023-08-26 18:50:20,664 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 61 places, 95 transitions, 450 flow [2023-08-26 18:50:20,665 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 59 places, 95 transitions, 448 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:50:20,665 INFO L231 Difference]: Finished difference. Result has 59 places, 0 transitions, 0 flow [2023-08-26 18:50:20,665 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=365, PETRI_DIFFERENCE_MINUEND_FLOW=130, PETRI_DIFFERENCE_MINUEND_PLACES=54, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=42, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=42, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=59, PETRI_TRANSITIONS=0} [2023-08-26 18:50:20,665 INFO L281 CegarLoopForPetriNet]: 82 programPoint places, -23 predicate places. [2023-08-26 18:50:20,665 INFO L495 AbstractCegarLoop]: Abstraction has has 59 places, 0 transitions, 0 flow [2023-08-26 18:50:20,666 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 162.33333333333334) internal successors, (1461), 9 states have internal predecessors, (1461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:50:20,666 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (36 of 37 remaining) [2023-08-26 18:50:20,666 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (35 of 37 remaining) [2023-08-26 18:50:20,666 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (34 of 37 remaining) [2023-08-26 18:50:20,666 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (33 of 37 remaining) [2023-08-26 18:50:20,667 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (32 of 37 remaining) [2023-08-26 18:50:20,667 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (31 of 37 remaining) [2023-08-26 18:50:20,667 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (30 of 37 remaining) [2023-08-26 18:50:20,667 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (29 of 37 remaining) [2023-08-26 18:50:20,667 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (28 of 37 remaining) [2023-08-26 18:50:20,667 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (27 of 37 remaining) [2023-08-26 18:50:20,667 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (26 of 37 remaining) [2023-08-26 18:50:20,667 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (25 of 37 remaining) [2023-08-26 18:50:20,667 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (24 of 37 remaining) [2023-08-26 18:50:20,667 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 37 remaining) [2023-08-26 18:50:20,667 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 37 remaining) [2023-08-26 18:50:20,667 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONASSERT (9 of 37 remaining) [2023-08-26 18:50:20,668 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 37 remaining) [2023-08-26 18:50:20,669 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 37 remaining) [2023-08-26 18:50:20,669 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 37 remaining) [2023-08-26 18:50:20,669 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 37 remaining) [2023-08-26 18:50:20,669 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 37 remaining) [2023-08-26 18:50:20,669 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 37 remaining) [2023-08-26 18:50:20,669 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 37 remaining) [2023-08-26 18:50:20,669 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 37 remaining) [2023-08-26 18:50:20,669 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 37 remaining) [2023-08-26 18:50:20,673 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-08-26 18:50:20,870 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-08-26 18:50:20,870 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2023-08-26 18:50:20,871 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:50:20,873 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 180 places, 196 transitions, 413 flow [2023-08-26 18:50:20,889 INFO L124 PetriNetUnfolderBase]: 38/317 cut-off events. [2023-08-26 18:50:20,889 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 18:50:20,891 INFO L83 FinitePrefix]: Finished finitePrefix Result has 333 conditions, 317 events. 38/317 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1122 event pairs, 0 based on Foata normal form. 0/231 useless extension candidates. Maximal degree in co-relation 238. Up to 8 conditions per place. [2023-08-26 18:50:20,891 INFO L82 GeneralOperation]: Start removeDead. Operand has 180 places, 196 transitions, 413 flow [2023-08-26 18:50:20,892 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 180 places, 196 transitions, 413 flow [2023-08-26 18:50:20,892 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:50:20,892 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 180 places, 196 transitions, 413 flow [2023-08-26 18:50:20,892 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 180 places, 196 transitions, 413 flow [2023-08-26 18:50:20,892 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 180 places, 196 transitions, 413 flow [2023-08-26 18:50:20,909 INFO L124 PetriNetUnfolderBase]: 38/317 cut-off events. [2023-08-26 18:50:20,910 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 18:50:20,911 INFO L83 FinitePrefix]: Finished finitePrefix Result has 333 conditions, 317 events. 38/317 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1122 event pairs, 0 based on Foata normal form. 0/231 useless extension candidates. Maximal degree in co-relation 238. Up to 8 conditions per place. [2023-08-26 18:50:20,915 INFO L119 LiptonReduction]: Number of co-enabled transitions 20160 [2023-08-26 18:50:24,228 INFO L134 LiptonReduction]: Checked pairs total: 55771 [2023-08-26 18:50:24,228 INFO L136 LiptonReduction]: Total number of compositions: 171 [2023-08-26 18:50:24,229 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:50:24,229 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;@93c0f8e, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:50:24,229 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:50:24,236 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:50:24,236 INFO L124 PetriNetUnfolderBase]: 21/113 cut-off events. [2023-08-26 18:50:24,236 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 18:50:24,236 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:24,236 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 18:50:24,237 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:50:24,237 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:24,237 INFO L85 PathProgramCache]: Analyzing trace with hash 873773430, now seen corresponding path program 1 times [2023-08-26 18:50:24,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:24,237 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [244662642] [2023-08-26 18:50:24,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:24,238 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:24,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:50:24,266 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:50:24,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:50:24,285 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:50:24,285 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:50:24,285 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:50:24,285 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-08-26 18:50:24,286 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:50:24,289 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:50:24,289 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:50:24,289 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 18:50:24,311 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:50:24,314 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 217 places, 237 transitions, 506 flow [2023-08-26 18:50:24,356 INFO L124 PetriNetUnfolderBase]: 49/400 cut-off events. [2023-08-26 18:50:24,357 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 18:50:24,362 INFO L83 FinitePrefix]: Finished finitePrefix Result has 423 conditions, 400 events. 49/400 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1481 event pairs, 0 based on Foata normal form. 0/289 useless extension candidates. Maximal degree in co-relation 325. Up to 10 conditions per place. [2023-08-26 18:50:24,362 INFO L82 GeneralOperation]: Start removeDead. Operand has 217 places, 237 transitions, 506 flow [2023-08-26 18:50:24,366 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 217 places, 237 transitions, 506 flow [2023-08-26 18:50:24,366 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:50:24,366 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 217 places, 237 transitions, 506 flow [2023-08-26 18:50:24,366 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 217 places, 237 transitions, 506 flow [2023-08-26 18:50:24,367 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 217 places, 237 transitions, 506 flow [2023-08-26 18:50:24,409 INFO L124 PetriNetUnfolderBase]: 49/400 cut-off events. [2023-08-26 18:50:24,409 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 18:50:24,414 INFO L83 FinitePrefix]: Finished finitePrefix Result has 423 conditions, 400 events. 49/400 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1481 event pairs, 0 based on Foata normal form. 0/289 useless extension candidates. Maximal degree in co-relation 325. Up to 10 conditions per place. [2023-08-26 18:50:24,426 INFO L119 LiptonReduction]: Number of co-enabled transitions 33440 [2023-08-26 18:50:27,712 INFO L134 LiptonReduction]: Checked pairs total: 95265 [2023-08-26 18:50:27,712 INFO L136 LiptonReduction]: Total number of compositions: 202 [2023-08-26 18:50:27,713 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:50:27,713 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;@93c0f8e, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:50:27,713 INFO L358 AbstractCegarLoop]: Starting to check reachability of 45 error locations. [2023-08-26 18:50:27,714 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:50:27,714 INFO L124 PetriNetUnfolderBase]: 0/3 cut-off events. [2023-08-26 18:50:27,714 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:50:27,714 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:50:27,714 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:50:27,715 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-08-26 18:50:27,715 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:50:27,715 INFO L85 PathProgramCache]: Analyzing trace with hash 66904, now seen corresponding path program 1 times [2023-08-26 18:50:27,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:50:27,715 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043050300] [2023-08-26 18:50:27,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:50:27,715 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:50:27,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:50:27,751 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:50:27,751 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:50:27,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043050300] [2023-08-26 18:50:27,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2043050300] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:50:27,752 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:50:27,752 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:50:27,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264769788] [2023-08-26 18:50:27,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:50:27,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:50:27,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:50:27,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:50:27,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:50:27,754 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 151 out of 439 [2023-08-26 18:50:27,754 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 104 places, 121 transitions, 274 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 18:50:27,754 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:50:27,754 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 151 of 439 [2023-08-26 18:50:27,754 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand