/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf --traceabstraction.order.of.the.error.locations.to.be.checked PROGRAM_FIRST -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml --cacsl2boogietranslator.check.unreachability.of.reach_error.function false --cacsl2boogietranslator.pointer.base.address.is.valid.at.dereference ASSERTandASSUME --cacsl2boogietranslator.pointer.to.allocated.memory.at.dereference ASSERTandASSUME --cacsl2boogietranslator.check.array.bounds.for.arrays.that.are.off.heap ASSERTandASSUME --cacsl2boogietranslator.check.if.freed.pointer.was.valid true --cacsl2boogietranslator.adapt.memory.model.on.pointer.casts.if.necessary true -i ../../../trunk/examples/svcomp/pthread-ext/39_rand_lock_p0_vs.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 17:58:56,682 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 17:58:56,764 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf [2023-08-26 17:58:56,768 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 17:58:56,769 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 17:58:56,798 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 17:58:56,799 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 17:58:56,799 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 17:58:56,800 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 17:58:56,803 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 17:58:56,803 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 17:58:56,803 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 17:58:56,804 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 17:58:56,805 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 17:58:56,805 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 17:58:56,805 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 17:58:56,805 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 17:58:56,806 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 17:58:56,806 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 17:58:56,806 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 17:58:56,806 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 17:58:56,807 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 17:58:56,807 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 17:58:56,808 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 17:58:56,808 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 17:58:56,808 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 17:58:56,808 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 17:58:56,808 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 17:58:56,809 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 17:58:56,809 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 17:58:56,810 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 17:58:56,810 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 17:58:56,810 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 17:58:56,810 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 17:58:56,810 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 17:58:56,811 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 17:58:57,101 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 17:58:57,116 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 17:58:57,118 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 17:58:57,119 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 17:58:57,119 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 17:58:57,120 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread-ext/39_rand_lock_p0_vs.i [2023-08-26 17:58:58,307 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 17:58:58,567 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 17:58:58,567 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread-ext/39_rand_lock_p0_vs.i [2023-08-26 17:58:58,579 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8015b1048/03fe96564b0a4a5197362f74e4f3a6ed/FLAGcb8e021d4 [2023-08-26 17:58:58,590 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8015b1048/03fe96564b0a4a5197362f74e4f3a6ed [2023-08-26 17:58:58,592 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 17:58:58,593 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 17:58:58,594 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 17:58:58,594 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 17:58:58,597 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 17:58:58,597 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 05:58:58" (1/1) ... [2023-08-26 17:58:58,598 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d999b66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:58, skipping insertion in model container [2023-08-26 17:58:58,598 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 05:58:58" (1/1) ... [2023-08-26 17:58:58,637 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 17:58:58,831 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-08-26 17:58:58,983 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 17:58:58,993 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 17:58:59,015 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-08-26 17:58:59,025 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [270] [2023-08-26 17:58:59,026 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [270] [2023-08-26 17:58:59,040 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 17:58:59,073 WARN L669 CHandler]: The function __VERIFIER_atomic_begin is called, but not defined or handled by StandardFunctionHandler. [2023-08-26 17:58:59,073 WARN L669 CHandler]: The function __VERIFIER_atomic_end is called, but not defined or handled by StandardFunctionHandler. [2023-08-26 17:58:59,073 WARN L669 CHandler]: The function __builtin_bswap16 is called, but not defined or handled by StandardFunctionHandler. [2023-08-26 17:58:59,079 INFO L206 MainTranslator]: Completed translation [2023-08-26 17:58:59,080 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59 WrapperNode [2023-08-26 17:58:59,080 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 17:58:59,081 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 17:58:59,081 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 17:58:59,081 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 17:58:59,087 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59" (1/1) ... [2023-08-26 17:58:59,115 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59" (1/1) ... [2023-08-26 17:58:59,139 INFO L138 Inliner]: procedures = 176, calls = 22, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 79 [2023-08-26 17:58:59,139 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 17:58:59,139 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 17:58:59,140 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 17:58:59,140 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 17:58:59,147 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59" (1/1) ... [2023-08-26 17:58:59,147 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59" (1/1) ... [2023-08-26 17:58:59,150 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59" (1/1) ... [2023-08-26 17:58:59,150 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59" (1/1) ... [2023-08-26 17:58:59,154 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59" (1/1) ... [2023-08-26 17:58:59,157 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59" (1/1) ... [2023-08-26 17:58:59,158 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59" (1/1) ... [2023-08-26 17:58:59,159 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59" (1/1) ... [2023-08-26 17:58:59,161 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 17:58:59,162 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 17:58:59,162 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 17:58:59,162 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 17:58:59,162 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59" (1/1) ... [2023-08-26 17:58:59,167 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 17:58:59,178 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 17:58:59,198 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-26 17:58:59,213 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-26 17:58:59,243 INFO L130 BoogieDeclarations]: Found specification of procedure thr1 [2023-08-26 17:58:59,243 INFO L138 BoogieDeclarations]: Found implementation of procedure thr1 [2023-08-26 17:58:59,243 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 17:58:59,243 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2023-08-26 17:58:59,244 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 17:58:59,244 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 17:58:59,244 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 17:58:59,244 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 17:58:59,244 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2023-08-26 17:58:59,244 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 17:58:59,244 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 17:58:59,246 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-26 17:58:59,342 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 17:58:59,344 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 17:58:59,464 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 17:58:59,497 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 17:58:59,497 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-08-26 17:58:59,499 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 05:58:59 BoogieIcfgContainer [2023-08-26 17:58:59,499 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 17:58:59,501 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 17:58:59,501 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 17:58:59,504 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 17:58:59,504 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 05:58:58" (1/3) ... [2023-08-26 17:58:59,504 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11620094 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 05:58:59, skipping insertion in model container [2023-08-26 17:58:59,505 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 05:58:59" (2/3) ... [2023-08-26 17:58:59,505 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11620094 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 05:58:59, skipping insertion in model container [2023-08-26 17:58:59,505 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 05:58:59" (3/3) ... [2023-08-26 17:58:59,506 INFO L112 eAbstractionObserver]: Analyzing ICFG 39_rand_lock_p0_vs.i [2023-08-26 17:58:59,517 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 17:58:59,517 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 3 error locations. [2023-08-26 17:58:59,517 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 17:58:59,563 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:58:59,592 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 64 places, 64 transitions, 133 flow [2023-08-26 17:58:59,678 INFO L124 PetriNetUnfolderBase]: 4/76 cut-off events. [2023-08-26 17:58:59,679 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:58:59,684 INFO L83 FinitePrefix]: Finished finitePrefix Result has 81 conditions, 76 events. 4/76 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 81 event pairs, 0 based on Foata normal form. 0/65 useless extension candidates. Maximal degree in co-relation 50. Up to 4 conditions per place. [2023-08-26 17:58:59,684 INFO L82 GeneralOperation]: Start removeDead. Operand has 64 places, 64 transitions, 133 flow [2023-08-26 17:58:59,689 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 64 places, 64 transitions, 133 flow [2023-08-26 17:58:59,692 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:58:59,704 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 64 places, 64 transitions, 133 flow [2023-08-26 17:58:59,710 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 64 places, 64 transitions, 133 flow [2023-08-26 17:58:59,711 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 64 places, 64 transitions, 133 flow [2023-08-26 17:58:59,740 INFO L124 PetriNetUnfolderBase]: 4/76 cut-off events. [2023-08-26 17:58:59,740 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:58:59,741 INFO L83 FinitePrefix]: Finished finitePrefix Result has 81 conditions, 76 events. 4/76 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 81 event pairs, 0 based on Foata normal form. 0/65 useless extension candidates. Maximal degree in co-relation 50. Up to 4 conditions per place. [2023-08-26 17:58:59,742 INFO L119 LiptonReduction]: Number of co-enabled transitions 1080 [2023-08-26 17:59:01,733 INFO L134 LiptonReduction]: Checked pairs total: 984 [2023-08-26 17:59:01,734 INFO L136 LiptonReduction]: Total number of compositions: 65 [2023-08-26 17:59:01,753 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:59:01,760 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;@6b5091fc, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:59:01,760 INFO L358 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2023-08-26 17:59:01,762 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:59:01,762 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 17:59:01,762 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:59:01,762 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:01,763 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:59:01,763 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE] === [2023-08-26 17:59:01,767 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:01,767 INFO L85 PathProgramCache]: Analyzing trace with hash 10893, now seen corresponding path program 1 times [2023-08-26 17:59:01,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:01,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432827949] [2023-08-26 17:59:01,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:01,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:01,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:01,980 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:01,980 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:01,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432827949] [2023-08-26 17:59:01,981 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432827949] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:01,981 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:01,981 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:01,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025802253] [2023-08-26 17:59:01,983 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:01,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:01,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:02,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:02,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:02,021 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 47 out of 129 [2023-08-26 17:59:02,023 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 14 places, 12 transitions, 29 flow. Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 3 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,023 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:02,023 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 47 of 129 [2023-08-26 17:59:02,024 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:02,056 INFO L124 PetriNetUnfolderBase]: 13/33 cut-off events. [2023-08-26 17:59:02,056 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:59:02,057 INFO L83 FinitePrefix]: Finished finitePrefix Result has 71 conditions, 33 events. 13/33 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 69 event pairs, 9 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 56. Up to 32 conditions per place. [2023-08-26 17:59:02,058 INFO L140 encePairwiseOnDemand]: 126/129 looper letters, 8 selfloop transitions, 1 changer transitions 0/10 dead transitions. [2023-08-26 17:59:02,059 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 14 places, 10 transitions, 43 flow [2023-08-26 17:59:02,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:02,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:02,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 152 transitions. [2023-08-26 17:59:02,073 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.39276485788113696 [2023-08-26 17:59:02,075 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 152 transitions. [2023-08-26 17:59:02,075 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 152 transitions. [2023-08-26 17:59:02,076 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:02,078 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 152 transitions. [2023-08-26 17:59:02,084 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 50.666666666666664) internal successors, (152), 3 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,090 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 129.0) internal successors, (516), 4 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,090 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 129.0) internal successors, (516), 4 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,092 INFO L175 Difference]: Start difference. First operand has 14 places, 12 transitions, 29 flow. Second operand 3 states and 152 transitions. [2023-08-26 17:59:02,093 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 14 places, 10 transitions, 43 flow [2023-08-26 17:59:02,094 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 14 places, 10 transitions, 43 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 17:59:02,095 INFO L231 Difference]: Finished difference. Result has 14 places, 10 transitions, 27 flow [2023-08-26 17:59:02,097 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=129, PETRI_DIFFERENCE_MINUEND_FLOW=25, PETRI_DIFFERENCE_MINUEND_PLACES=12, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=10, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=9, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=27, PETRI_PLACES=14, PETRI_TRANSITIONS=10} [2023-08-26 17:59:02,100 INFO L281 CegarLoopForPetriNet]: 14 programPoint places, 0 predicate places. [2023-08-26 17:59:02,100 INFO L495 AbstractCegarLoop]: Abstraction has has 14 places, 10 transitions, 27 flow [2023-08-26 17:59:02,101 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 3 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,101 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:02,101 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:59:02,102 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 17:59:02,102 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE] === [2023-08-26 17:59:02,109 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:02,109 INFO L85 PathProgramCache]: Analyzing trace with hash 10891, now seen corresponding path program 1 times [2023-08-26 17:59:02,110 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:02,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169107241] [2023-08-26 17:59:02,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:02,110 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:02,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:02,155 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:02,155 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:02,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169107241] [2023-08-26 17:59:02,156 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169107241] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:02,156 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:02,156 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:02,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217909554] [2023-08-26 17:59:02,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:02,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:02,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:02,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:02,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:02,159 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 46 out of 129 [2023-08-26 17:59:02,159 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 14 places, 10 transitions, 27 flow. Second operand has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 3 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,159 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:02,159 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 46 of 129 [2023-08-26 17:59:02,159 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:02,186 INFO L124 PetriNetUnfolderBase]: 9/24 cut-off events. [2023-08-26 17:59:02,187 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:59:02,187 INFO L83 FinitePrefix]: Finished finitePrefix Result has 55 conditions, 24 events. 9/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 41 event pairs, 6 based on Foata normal form. 0/18 useless extension candidates. Maximal degree in co-relation 48. Up to 23 conditions per place. [2023-08-26 17:59:02,187 INFO L140 encePairwiseOnDemand]: 127/129 looper letters, 4 selfloop transitions, 1 changer transitions 3/9 dead transitions. [2023-08-26 17:59:02,187 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 15 places, 9 transitions, 41 flow [2023-08-26 17:59:02,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:02,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:02,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 147 transitions. [2023-08-26 17:59:02,190 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3798449612403101 [2023-08-26 17:59:02,190 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 147 transitions. [2023-08-26 17:59:02,190 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 147 transitions. [2023-08-26 17:59:02,191 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:02,191 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 147 transitions. [2023-08-26 17:59:02,191 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 49.0) internal successors, (147), 3 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,192 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 129.0) internal successors, (516), 4 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,193 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 129.0) internal successors, (516), 4 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,193 INFO L175 Difference]: Start difference. First operand has 14 places, 10 transitions, 27 flow. Second operand 3 states and 147 transitions. [2023-08-26 17:59:02,193 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 15 places, 9 transitions, 41 flow [2023-08-26 17:59:02,193 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 14 places, 9 transitions, 40 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:59:02,194 INFO L231 Difference]: Finished difference. Result has 14 places, 6 transitions, 20 flow [2023-08-26 17:59:02,194 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=129, PETRI_DIFFERENCE_MINUEND_FLOW=24, PETRI_DIFFERENCE_MINUEND_PLACES=12, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=9, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=8, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=20, PETRI_PLACES=14, PETRI_TRANSITIONS=6} [2023-08-26 17:59:02,195 INFO L281 CegarLoopForPetriNet]: 14 programPoint places, 0 predicate places. [2023-08-26 17:59:02,195 INFO L495 AbstractCegarLoop]: Abstraction has has 14 places, 6 transitions, 20 flow [2023-08-26 17:59:02,195 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 3 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,195 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:02,195 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:59:02,195 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 17:59:02,196 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE] === [2023-08-26 17:59:02,196 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:02,196 INFO L85 PathProgramCache]: Analyzing trace with hash 10475205, now seen corresponding path program 1 times [2023-08-26 17:59:02,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:02,197 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133930303] [2023-08-26 17:59:02,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:02,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:02,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:02,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:02,256 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:02,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133930303] [2023-08-26 17:59:02,257 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133930303] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:02,257 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:02,257 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:02,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489353138] [2023-08-26 17:59:02,258 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:02,258 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:02,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:02,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:02,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:02,259 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 53 out of 129 [2023-08-26 17:59:02,260 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 14 places, 6 transitions, 20 flow. Second operand has 3 states, 3 states have (on average 54.333333333333336) internal successors, (163), 3 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,260 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:02,260 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 53 of 129 [2023-08-26 17:59:02,260 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:02,270 INFO L124 PetriNetUnfolderBase]: 0/6 cut-off events. [2023-08-26 17:59:02,270 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:59:02,270 INFO L83 FinitePrefix]: Finished finitePrefix Result has 20 conditions, 6 events. 0/6 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 1. Compared 0 event pairs, 0 based on Foata normal form. 3/9 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2023-08-26 17:59:02,270 INFO L140 encePairwiseOnDemand]: 127/129 looper letters, 0 selfloop transitions, 0 changer transitions 5/5 dead transitions. [2023-08-26 17:59:02,270 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 13 places, 5 transitions, 26 flow [2023-08-26 17:59:02,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:02,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:02,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 164 transitions. [2023-08-26 17:59:02,272 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42377260981912146 [2023-08-26 17:59:02,272 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 164 transitions. [2023-08-26 17:59:02,272 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 164 transitions. [2023-08-26 17:59:02,272 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:02,272 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 164 transitions. [2023-08-26 17:59:02,273 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 54.666666666666664) internal successors, (164), 3 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,274 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 129.0) internal successors, (516), 4 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,274 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 129.0) internal successors, (516), 4 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,275 INFO L175 Difference]: Start difference. First operand has 14 places, 6 transitions, 20 flow. Second operand 3 states and 164 transitions. [2023-08-26 17:59:02,275 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 13 places, 5 transitions, 26 flow [2023-08-26 17:59:02,275 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 12 places, 5 transitions, 25 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:59:02,275 INFO L231 Difference]: Finished difference. Result has 12 places, 0 transitions, 0 flow [2023-08-26 17:59:02,275 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=129, PETRI_DIFFERENCE_MINUEND_FLOW=17, PETRI_DIFFERENCE_MINUEND_PLACES=10, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=5, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=5, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=12, PETRI_TRANSITIONS=0} [2023-08-26 17:59:02,276 INFO L281 CegarLoopForPetriNet]: 14 programPoint places, -2 predicate places. [2023-08-26 17:59:02,276 INFO L495 AbstractCegarLoop]: Abstraction has has 12 places, 0 transitions, 0 flow [2023-08-26 17:59:02,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.333333333333336) internal successors, (163), 3 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:02,279 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 4 remaining) [2023-08-26 17:59:02,279 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 4 remaining) [2023-08-26 17:59:02,280 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 4 remaining) [2023-08-26 17:59:02,280 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 4 remaining) [2023-08-26 17:59:02,280 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-08-26 17:59:02,280 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-26 17:59:02,282 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 17:59:02,287 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 64 places, 64 transitions, 133 flow [2023-08-26 17:59:02,296 INFO L124 PetriNetUnfolderBase]: 4/76 cut-off events. [2023-08-26 17:59:02,296 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:59:02,297 INFO L83 FinitePrefix]: Finished finitePrefix Result has 81 conditions, 76 events. 4/76 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 81 event pairs, 0 based on Foata normal form. 0/65 useless extension candidates. Maximal degree in co-relation 50. Up to 4 conditions per place. [2023-08-26 17:59:02,297 INFO L82 GeneralOperation]: Start removeDead. Operand has 64 places, 64 transitions, 133 flow [2023-08-26 17:59:02,298 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 64 places, 64 transitions, 133 flow [2023-08-26 17:59:02,298 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:59:02,298 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 64 places, 64 transitions, 133 flow [2023-08-26 17:59:02,298 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 64 places, 64 transitions, 133 flow [2023-08-26 17:59:02,298 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 64 places, 64 transitions, 133 flow [2023-08-26 17:59:02,307 INFO L124 PetriNetUnfolderBase]: 4/76 cut-off events. [2023-08-26 17:59:02,307 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:59:02,308 INFO L83 FinitePrefix]: Finished finitePrefix Result has 81 conditions, 76 events. 4/76 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 81 event pairs, 0 based on Foata normal form. 0/65 useless extension candidates. Maximal degree in co-relation 50. Up to 4 conditions per place. [2023-08-26 17:59:02,309 INFO L119 LiptonReduction]: Number of co-enabled transitions 1080 [2023-08-26 17:59:03,973 INFO L134 LiptonReduction]: Checked pairs total: 964 [2023-08-26 17:59:03,973 INFO L136 LiptonReduction]: Total number of compositions: 63 [2023-08-26 17:59:03,975 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 17:59:03,976 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;@6b5091fc, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:59:03,976 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 17:59:03,981 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:59:03,981 INFO L124 PetriNetUnfolderBase]: 1/15 cut-off events. [2023-08-26 17:59:03,981 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:59:03,981 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:03,981 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 17:59:03,982 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 17:59:03,982 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:03,982 INFO L85 PathProgramCache]: Analyzing trace with hash -924983252, now seen corresponding path program 1 times [2023-08-26 17:59:03,982 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:03,984 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928926797] [2023-08-26 17:59:03,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:03,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:04,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:59:04,005 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 17:59:04,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:59:04,031 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 17:59:04,031 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 17:59:04,031 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 17:59:04,032 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 17:59:04,032 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 17:59:04,032 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 17:59:04,033 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 17:59:04,033 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 17:59:04,054 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:59:04,057 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 101 places, 101 transitions, 214 flow [2023-08-26 17:59:04,075 INFO L124 PetriNetUnfolderBase]: 7/127 cut-off events. [2023-08-26 17:59:04,075 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:59:04,077 INFO L83 FinitePrefix]: Finished finitePrefix Result has 137 conditions, 127 events. 7/127 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 235 event pairs, 0 based on Foata normal form. 0/109 useless extension candidates. Maximal degree in co-relation 86. Up to 6 conditions per place. [2023-08-26 17:59:04,077 INFO L82 GeneralOperation]: Start removeDead. Operand has 101 places, 101 transitions, 214 flow [2023-08-26 17:59:04,078 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 101 places, 101 transitions, 214 flow [2023-08-26 17:59:04,078 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:59:04,078 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 101 places, 101 transitions, 214 flow [2023-08-26 17:59:04,078 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 101 places, 101 transitions, 214 flow [2023-08-26 17:59:04,078 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 101 places, 101 transitions, 214 flow [2023-08-26 17:59:04,096 INFO L124 PetriNetUnfolderBase]: 7/127 cut-off events. [2023-08-26 17:59:04,096 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:59:04,098 INFO L83 FinitePrefix]: Finished finitePrefix Result has 137 conditions, 127 events. 7/127 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 235 event pairs, 0 based on Foata normal form. 0/109 useless extension candidates. Maximal degree in co-relation 86. Up to 6 conditions per place. [2023-08-26 17:59:04,100 INFO L119 LiptonReduction]: Number of co-enabled transitions 4824 [2023-08-26 17:59:05,936 INFO L134 LiptonReduction]: Checked pairs total: 5832 [2023-08-26 17:59:05,937 INFO L136 LiptonReduction]: Total number of compositions: 96 [2023-08-26 17:59:05,939 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:59:05,940 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;@6b5091fc, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:59:05,940 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 17:59:05,941 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:59:05,942 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 17:59:05,942 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:59:05,942 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:05,942 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:59:05,942 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 1 more)] === [2023-08-26 17:59:05,943 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:05,943 INFO L85 PathProgramCache]: Analyzing trace with hash 20317, now seen corresponding path program 1 times [2023-08-26 17:59:05,943 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:05,943 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [385607716] [2023-08-26 17:59:05,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:05,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:05,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:05,969 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:05,969 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:05,970 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [385607716] [2023-08-26 17:59:05,970 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [385607716] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:05,970 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:05,970 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:05,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376499041] [2023-08-26 17:59:05,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:05,971 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:05,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:05,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:05,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:05,972 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 197 [2023-08-26 17:59:05,972 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 24 transitions, 60 flow. Second operand has 3 states, 3 states have (on average 77.66666666666667) internal successors, (233), 3 states have internal predecessors, (233), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:05,972 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:05,973 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 197 [2023-08-26 17:59:05,973 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:06,069 INFO L124 PetriNetUnfolderBase]: 267/455 cut-off events. [2023-08-26 17:59:06,069 INFO L125 PetriNetUnfolderBase]: For 24/24 co-relation queries the response was YES. [2023-08-26 17:59:06,071 INFO L83 FinitePrefix]: Finished finitePrefix Result has 930 conditions, 455 events. 267/455 cut-off events. For 24/24 co-relation queries the response was YES. Maximal size of possible extension queue 50. Compared 2099 event pairs, 222 based on Foata normal form. 0/294 useless extension candidates. Maximal degree in co-relation 338. Up to 438 conditions per place. [2023-08-26 17:59:06,075 INFO L140 encePairwiseOnDemand]: 194/197 looper letters, 18 selfloop transitions, 1 changer transitions 0/22 dead transitions. [2023-08-26 17:59:06,075 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 27 places, 22 transitions, 94 flow [2023-08-26 17:59:06,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:06,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:06,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 252 transitions. [2023-08-26 17:59:06,079 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4263959390862944 [2023-08-26 17:59:06,080 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 252 transitions. [2023-08-26 17:59:06,080 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 252 transitions. [2023-08-26 17:59:06,080 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:06,080 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 252 transitions. [2023-08-26 17:59:06,081 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 84.0) internal successors, (252), 3 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,084 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 197.0) internal successors, (788), 4 states have internal predecessors, (788), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,084 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 197.0) internal successors, (788), 4 states have internal predecessors, (788), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,084 INFO L175 Difference]: Start difference. First operand has 27 places, 24 transitions, 60 flow. Second operand 3 states and 252 transitions. [2023-08-26 17:59:06,085 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 27 places, 22 transitions, 94 flow [2023-08-26 17:59:06,085 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 22 transitions, 92 flow, removed 1 selfloop flow, removed 0 redundant places. [2023-08-26 17:59:06,086 INFO L231 Difference]: Finished difference. Result has 27 places, 22 transitions, 56 flow [2023-08-26 17:59:06,086 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=197, PETRI_DIFFERENCE_MINUEND_FLOW=54, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=22, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=21, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=56, PETRI_PLACES=27, PETRI_TRANSITIONS=22} [2023-08-26 17:59:06,090 INFO L281 CegarLoopForPetriNet]: 27 programPoint places, 0 predicate places. [2023-08-26 17:59:06,090 INFO L495 AbstractCegarLoop]: Abstraction has has 27 places, 22 transitions, 56 flow [2023-08-26 17:59:06,091 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 77.66666666666667) internal successors, (233), 3 states have internal predecessors, (233), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,091 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:06,091 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:59:06,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 17:59:06,091 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 1 more)] === [2023-08-26 17:59:06,092 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:06,092 INFO L85 PathProgramCache]: Analyzing trace with hash 20318, now seen corresponding path program 1 times [2023-08-26 17:59:06,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:06,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [567926952] [2023-08-26 17:59:06,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:06,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:06,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:06,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:06,154 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:06,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [567926952] [2023-08-26 17:59:06,155 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [567926952] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:06,155 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:06,155 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:06,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697133221] [2023-08-26 17:59:06,155 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:06,156 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:06,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:06,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:06,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:06,157 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 78 out of 197 [2023-08-26 17:59:06,157 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 22 transitions, 56 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 17:59:06,157 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:06,157 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 78 of 197 [2023-08-26 17:59:06,158 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:06,214 INFO L124 PetriNetUnfolderBase]: 162/293 cut-off events. [2023-08-26 17:59:06,214 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 17:59:06,215 INFO L83 FinitePrefix]: Finished finitePrefix Result has 603 conditions, 293 events. 162/293 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 29. Compared 1185 event pairs, 132 based on Foata normal form. 0/219 useless extension candidates. Maximal degree in co-relation 595. Up to 276 conditions per place. [2023-08-26 17:59:06,216 INFO L140 encePairwiseOnDemand]: 195/197 looper letters, 17 selfloop transitions, 1 changer transitions 0/21 dead transitions. [2023-08-26 17:59:06,216 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 28 places, 21 transitions, 90 flow [2023-08-26 17:59:06,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:06,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:06,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 253 transitions. [2023-08-26 17:59:06,217 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.428087986463621 [2023-08-26 17:59:06,218 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 253 transitions. [2023-08-26 17:59:06,218 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 253 transitions. [2023-08-26 17:59:06,218 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:06,218 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 253 transitions. [2023-08-26 17:59:06,219 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 84.33333333333333) internal successors, (253), 3 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,221 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 197.0) internal successors, (788), 4 states have internal predecessors, (788), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,221 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 197.0) internal successors, (788), 4 states have internal predecessors, (788), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,221 INFO L175 Difference]: Start difference. First operand has 27 places, 22 transitions, 56 flow. Second operand 3 states and 253 transitions. [2023-08-26 17:59:06,221 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 28 places, 21 transitions, 90 flow [2023-08-26 17:59:06,222 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 21 transitions, 89 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:59:06,222 INFO L231 Difference]: Finished difference. Result has 27 places, 21 transitions, 55 flow [2023-08-26 17:59:06,223 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=197, PETRI_DIFFERENCE_MINUEND_FLOW=53, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=21, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=55, PETRI_PLACES=27, PETRI_TRANSITIONS=21} [2023-08-26 17:59:06,224 INFO L281 CegarLoopForPetriNet]: 27 programPoint places, 0 predicate places. [2023-08-26 17:59:06,225 INFO L495 AbstractCegarLoop]: Abstraction has has 27 places, 21 transitions, 55 flow [2023-08-26 17:59:06,225 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 17:59:06,225 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:06,225 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:59:06,225 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 17:59:06,226 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 1 more)] === [2023-08-26 17:59:06,226 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:06,226 INFO L85 PathProgramCache]: Analyzing trace with hash 19540169, now seen corresponding path program 1 times [2023-08-26 17:59:06,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:06,226 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212358249] [2023-08-26 17:59:06,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:06,227 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:06,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:06,279 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:06,279 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:06,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212358249] [2023-08-26 17:59:06,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212358249] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:06,280 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:06,280 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:06,280 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760065403] [2023-08-26 17:59:06,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:06,280 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:06,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:06,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:06,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:06,282 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 82 out of 197 [2023-08-26 17:59:06,282 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 21 transitions, 55 flow. Second operand has 3 states, 3 states have (on average 83.33333333333333) internal successors, (250), 3 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,283 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:06,283 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 82 of 197 [2023-08-26 17:59:06,283 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:06,343 INFO L124 PetriNetUnfolderBase]: 129/237 cut-off events. [2023-08-26 17:59:06,344 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 17:59:06,345 INFO L83 FinitePrefix]: Finished finitePrefix Result has 491 conditions, 237 events. 129/237 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 25. Compared 942 event pairs, 47 based on Foata normal form. 0/197 useless extension candidates. Maximal degree in co-relation 482. Up to 125 conditions per place. [2023-08-26 17:59:06,346 INFO L140 encePairwiseOnDemand]: 192/197 looper letters, 17 selfloop transitions, 3 changer transitions 10/33 dead transitions. [2023-08-26 17:59:06,346 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 33 transitions, 144 flow [2023-08-26 17:59:06,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:06,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:06,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 278 transitions. [2023-08-26 17:59:06,354 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4703891708967851 [2023-08-26 17:59:06,354 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 278 transitions. [2023-08-26 17:59:06,354 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 278 transitions. [2023-08-26 17:59:06,355 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:06,355 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 278 transitions. [2023-08-26 17:59:06,357 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 92.66666666666667) internal successors, (278), 3 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,359 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 197.0) internal successors, (788), 4 states have internal predecessors, (788), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,360 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 197.0) internal successors, (788), 4 states have internal predecessors, (788), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,360 INFO L175 Difference]: Start difference. First operand has 27 places, 21 transitions, 55 flow. Second operand 3 states and 278 transitions. [2023-08-26 17:59:06,360 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 33 transitions, 144 flow [2023-08-26 17:59:06,361 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 33 transitions, 143 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:59:06,362 INFO L231 Difference]: Finished difference. Result has 29 places, 21 transitions, 67 flow [2023-08-26 17:59:06,362 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=197, PETRI_DIFFERENCE_MINUEND_FLOW=54, PETRI_DIFFERENCE_MINUEND_PLACES=26, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=21, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=18, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=67, PETRI_PLACES=29, PETRI_TRANSITIONS=21} [2023-08-26 17:59:06,364 INFO L281 CegarLoopForPetriNet]: 27 programPoint places, 2 predicate places. [2023-08-26 17:59:06,364 INFO L495 AbstractCegarLoop]: Abstraction has has 29 places, 21 transitions, 67 flow [2023-08-26 17:59:06,365 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 83.33333333333333) internal successors, (250), 3 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,365 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:06,365 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:59:06,365 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-26 17:59:06,365 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 1 more)] === [2023-08-26 17:59:06,367 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:06,367 INFO L85 PathProgramCache]: Analyzing trace with hash 135401868, now seen corresponding path program 1 times [2023-08-26 17:59:06,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:06,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426784240] [2023-08-26 17:59:06,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:06,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:06,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:06,442 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:59:06,442 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:06,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426784240] [2023-08-26 17:59:06,442 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426784240] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:06,442 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:06,442 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:59:06,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909692063] [2023-08-26 17:59:06,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:06,443 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:06,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:06,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:06,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:06,444 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 82 out of 197 [2023-08-26 17:59:06,445 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 21 transitions, 67 flow. Second operand has 3 states, 3 states have (on average 85.0) internal successors, (255), 3 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,445 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:06,445 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 82 of 197 [2023-08-26 17:59:06,445 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:06,485 INFO L124 PetriNetUnfolderBase]: 109/201 cut-off events. [2023-08-26 17:59:06,485 INFO L125 PetriNetUnfolderBase]: For 28/28 co-relation queries the response was YES. [2023-08-26 17:59:06,485 INFO L83 FinitePrefix]: Finished finitePrefix Result has 457 conditions, 201 events. 109/201 cut-off events. For 28/28 co-relation queries the response was YES. Maximal size of possible extension queue 21. Compared 745 event pairs, 83 based on Foata normal form. 8/202 useless extension candidates. Maximal degree in co-relation 446. Up to 187 conditions per place. [2023-08-26 17:59:06,486 INFO L140 encePairwiseOnDemand]: 194/197 looper letters, 0 selfloop transitions, 0 changer transitions 19/19 dead transitions. [2023-08-26 17:59:06,486 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 19 transitions, 91 flow [2023-08-26 17:59:06,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:06,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:06,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 264 transitions. [2023-08-26 17:59:06,488 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4467005076142132 [2023-08-26 17:59:06,488 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 264 transitions. [2023-08-26 17:59:06,488 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 264 transitions. [2023-08-26 17:59:06,488 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:06,488 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 264 transitions. [2023-08-26 17:59:06,489 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 88.0) internal successors, (264), 3 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,490 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 197.0) internal successors, (788), 4 states have internal predecessors, (788), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,490 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 197.0) internal successors, (788), 4 states have internal predecessors, (788), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,490 INFO L175 Difference]: Start difference. First operand has 29 places, 21 transitions, 67 flow. Second operand 3 states and 264 transitions. [2023-08-26 17:59:06,490 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 19 transitions, 91 flow [2023-08-26 17:59:06,492 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 19 transitions, 85 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 17:59:06,493 INFO L231 Difference]: Finished difference. Result has 27 places, 0 transitions, 0 flow [2023-08-26 17:59:06,493 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=197, PETRI_DIFFERENCE_MINUEND_FLOW=53, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=19, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=27, PETRI_TRANSITIONS=0} [2023-08-26 17:59:06,494 INFO L281 CegarLoopForPetriNet]: 27 programPoint places, 0 predicate places. [2023-08-26 17:59:06,494 INFO L495 AbstractCegarLoop]: Abstraction has has 27 places, 0 transitions, 0 flow [2023-08-26 17:59:06,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 85.0) internal successors, (255), 3 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:06,495 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 5 remaining) [2023-08-26 17:59:06,495 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 5 remaining) [2023-08-26 17:59:06,497 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 5 remaining) [2023-08-26 17:59:06,498 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 5 remaining) [2023-08-26 17:59:06,498 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 17:59:06,498 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 17:59:06,498 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 17:59:06,500 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 17:59:06,504 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 101 places, 101 transitions, 214 flow [2023-08-26 17:59:06,531 INFO L124 PetriNetUnfolderBase]: 7/127 cut-off events. [2023-08-26 17:59:06,532 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:59:06,532 INFO L83 FinitePrefix]: Finished finitePrefix Result has 137 conditions, 127 events. 7/127 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 235 event pairs, 0 based on Foata normal form. 0/109 useless extension candidates. Maximal degree in co-relation 86. Up to 6 conditions per place. [2023-08-26 17:59:06,532 INFO L82 GeneralOperation]: Start removeDead. Operand has 101 places, 101 transitions, 214 flow [2023-08-26 17:59:06,533 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 101 places, 101 transitions, 214 flow [2023-08-26 17:59:06,533 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:59:06,533 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 101 places, 101 transitions, 214 flow [2023-08-26 17:59:06,533 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 101 places, 101 transitions, 214 flow [2023-08-26 17:59:06,533 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 101 places, 101 transitions, 214 flow [2023-08-26 17:59:06,547 INFO L124 PetriNetUnfolderBase]: 7/127 cut-off events. [2023-08-26 17:59:06,548 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:59:06,548 INFO L83 FinitePrefix]: Finished finitePrefix Result has 137 conditions, 127 events. 7/127 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 235 event pairs, 0 based on Foata normal form. 0/109 useless extension candidates. Maximal degree in co-relation 86. Up to 6 conditions per place. [2023-08-26 17:59:06,550 INFO L119 LiptonReduction]: Number of co-enabled transitions 4824 [2023-08-26 17:59:08,256 INFO L134 LiptonReduction]: Checked pairs total: 6032 [2023-08-26 17:59:08,256 INFO L136 LiptonReduction]: Total number of compositions: 96 [2023-08-26 17:59:08,257 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 17:59:08,258 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;@6b5091fc, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:59:08,258 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 17:59:08,261 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:59:08,261 INFO L124 PetriNetUnfolderBase]: 2/31 cut-off events. [2023-08-26 17:59:08,261 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 17:59:08,261 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:08,261 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 17:59:08,261 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 17:59:08,262 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:08,262 INFO L85 PathProgramCache]: Analyzing trace with hash 382920784, now seen corresponding path program 1 times [2023-08-26 17:59:08,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:08,262 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732618885] [2023-08-26 17:59:08,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:08,262 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:08,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:59:08,272 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 17:59:08,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:59:08,280 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 17:59:08,281 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 17:59:08,281 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 17:59:08,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 17:59:08,281 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 17:59:08,282 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 17:59:08,282 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 17:59:08,282 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 17:59:08,302 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:59:08,304 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 138 places, 138 transitions, 297 flow [2023-08-26 17:59:08,318 INFO L124 PetriNetUnfolderBase]: 10/178 cut-off events. [2023-08-26 17:59:08,319 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:59:08,320 INFO L83 FinitePrefix]: Finished finitePrefix Result has 194 conditions, 178 events. 10/178 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 445 event pairs, 0 based on Foata normal form. 0/153 useless extension candidates. Maximal degree in co-relation 131. Up to 8 conditions per place. [2023-08-26 17:59:08,320 INFO L82 GeneralOperation]: Start removeDead. Operand has 138 places, 138 transitions, 297 flow [2023-08-26 17:59:08,321 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 138 places, 138 transitions, 297 flow [2023-08-26 17:59:08,321 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:59:08,321 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 138 places, 138 transitions, 297 flow [2023-08-26 17:59:08,321 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 138 places, 138 transitions, 297 flow [2023-08-26 17:59:08,322 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 138 places, 138 transitions, 297 flow [2023-08-26 17:59:08,336 INFO L124 PetriNetUnfolderBase]: 10/178 cut-off events. [2023-08-26 17:59:08,336 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:59:08,337 INFO L83 FinitePrefix]: Finished finitePrefix Result has 194 conditions, 178 events. 10/178 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 445 event pairs, 0 based on Foata normal form. 0/153 useless extension candidates. Maximal degree in co-relation 131. Up to 8 conditions per place. [2023-08-26 17:59:08,342 INFO L119 LiptonReduction]: Number of co-enabled transitions 11232 [2023-08-26 17:59:10,584 INFO L134 LiptonReduction]: Checked pairs total: 14451 [2023-08-26 17:59:10,584 INFO L136 LiptonReduction]: Total number of compositions: 129 [2023-08-26 17:59:10,586 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:59:10,586 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;@6b5091fc, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:59:10,586 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 17:59:10,587 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:59:10,587 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 17:59:10,587 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:59:10,587 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:10,587 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:59:10,587 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 2 more)] === [2023-08-26 17:59:10,588 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:10,588 INFO L85 PathProgramCache]: Analyzing trace with hash 32982, now seen corresponding path program 1 times [2023-08-26 17:59:10,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:10,588 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432920287] [2023-08-26 17:59:10,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:10,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:10,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:10,604 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:10,604 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:10,604 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432920287] [2023-08-26 17:59:10,604 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432920287] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:10,604 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:10,604 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:10,605 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761367032] [2023-08-26 17:59:10,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:10,605 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:10,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:10,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:10,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:10,606 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 108 out of 267 [2023-08-26 17:59:10,606 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 36 places, 32 transitions, 85 flow. Second operand has 3 states, 3 states have (on average 108.66666666666667) internal successors, (326), 3 states have internal predecessors, (326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:10,606 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:10,606 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 108 of 267 [2023-08-26 17:59:10,607 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:10,993 INFO L124 PetriNetUnfolderBase]: 3060/4377 cut-off events. [2023-08-26 17:59:10,993 INFO L125 PetriNetUnfolderBase]: For 403/403 co-relation queries the response was YES. [2023-08-26 17:59:10,998 INFO L83 FinitePrefix]: Finished finitePrefix Result has 8966 conditions, 4377 events. 3060/4377 cut-off events. For 403/403 co-relation queries the response was YES. Maximal size of possible extension queue 290. Compared 23086 event pairs, 2574 based on Foata normal form. 0/2915 useless extension candidates. Maximal degree in co-relation 939. Up to 4260 conditions per place. [2023-08-26 17:59:11,016 INFO L140 encePairwiseOnDemand]: 264/267 looper letters, 26 selfloop transitions, 1 changer transitions 0/30 dead transitions. [2023-08-26 17:59:11,016 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 36 places, 30 transitions, 135 flow [2023-08-26 17:59:11,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:11,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:11,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 353 transitions. [2023-08-26 17:59:11,018 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44069912609238454 [2023-08-26 17:59:11,018 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 353 transitions. [2023-08-26 17:59:11,018 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 353 transitions. [2023-08-26 17:59:11,019 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:11,019 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 353 transitions. [2023-08-26 17:59:11,020 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 117.66666666666667) internal successors, (353), 3 states have internal predecessors, (353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,021 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,021 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,021 INFO L175 Difference]: Start difference. First operand has 36 places, 32 transitions, 85 flow. Second operand 3 states and 353 transitions. [2023-08-26 17:59:11,021 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 36 places, 30 transitions, 135 flow [2023-08-26 17:59:11,025 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 36 places, 30 transitions, 129 flow, removed 3 selfloop flow, removed 0 redundant places. [2023-08-26 17:59:11,025 INFO L231 Difference]: Finished difference. Result has 36 places, 30 transitions, 77 flow [2023-08-26 17:59:11,025 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=267, PETRI_DIFFERENCE_MINUEND_FLOW=75, PETRI_DIFFERENCE_MINUEND_PLACES=34, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=77, PETRI_PLACES=36, PETRI_TRANSITIONS=30} [2023-08-26 17:59:11,028 INFO L281 CegarLoopForPetriNet]: 36 programPoint places, 0 predicate places. [2023-08-26 17:59:11,028 INFO L495 AbstractCegarLoop]: Abstraction has has 36 places, 30 transitions, 77 flow [2023-08-26 17:59:11,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 108.66666666666667) internal successors, (326), 3 states have internal predecessors, (326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,028 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:11,028 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:59:11,028 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 17:59:11,028 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 2 more)] === [2023-08-26 17:59:11,029 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:11,029 INFO L85 PathProgramCache]: Analyzing trace with hash 32983, now seen corresponding path program 1 times [2023-08-26 17:59:11,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:11,029 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [773074272] [2023-08-26 17:59:11,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:11,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:11,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:11,062 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:11,062 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:11,062 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [773074272] [2023-08-26 17:59:11,062 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [773074272] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:11,063 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:11,063 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:11,063 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215945791] [2023-08-26 17:59:11,063 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:11,063 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:11,063 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:11,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:11,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:11,064 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 109 out of 267 [2023-08-26 17:59:11,065 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 36 places, 30 transitions, 77 flow. Second operand has 3 states, 3 states have (on average 109.66666666666667) internal successors, (329), 3 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,065 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:11,065 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 109 of 267 [2023-08-26 17:59:11,065 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:11,331 INFO L124 PetriNetUnfolderBase]: 1926/2843 cut-off events. [2023-08-26 17:59:11,331 INFO L125 PetriNetUnfolderBase]: For 156/156 co-relation queries the response was YES. [2023-08-26 17:59:11,334 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5781 conditions, 2843 events. 1926/2843 cut-off events. For 156/156 co-relation queries the response was YES. Maximal size of possible extension queue 169. Compared 14035 event pairs, 1602 based on Foata normal form. 0/2105 useless extension candidates. Maximal degree in co-relation 5772. Up to 2726 conditions per place. [2023-08-26 17:59:11,342 INFO L140 encePairwiseOnDemand]: 265/267 looper letters, 25 selfloop transitions, 1 changer transitions 0/29 dead transitions. [2023-08-26 17:59:11,343 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 29 transitions, 127 flow [2023-08-26 17:59:11,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:11,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:11,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 354 transitions. [2023-08-26 17:59:11,344 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4419475655430712 [2023-08-26 17:59:11,344 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 354 transitions. [2023-08-26 17:59:11,344 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 354 transitions. [2023-08-26 17:59:11,345 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:11,345 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 354 transitions. [2023-08-26 17:59:11,345 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 118.0) internal successors, (354), 3 states have internal predecessors, (354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,347 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,347 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,347 INFO L175 Difference]: Start difference. First operand has 36 places, 30 transitions, 77 flow. Second operand 3 states and 354 transitions. [2023-08-26 17:59:11,347 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 29 transitions, 127 flow [2023-08-26 17:59:11,348 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 36 places, 29 transitions, 126 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:59:11,349 INFO L231 Difference]: Finished difference. Result has 36 places, 29 transitions, 76 flow [2023-08-26 17:59:11,349 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=267, PETRI_DIFFERENCE_MINUEND_FLOW=74, PETRI_DIFFERENCE_MINUEND_PLACES=34, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=28, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=76, PETRI_PLACES=36, PETRI_TRANSITIONS=29} [2023-08-26 17:59:11,350 INFO L281 CegarLoopForPetriNet]: 36 programPoint places, 0 predicate places. [2023-08-26 17:59:11,350 INFO L495 AbstractCegarLoop]: Abstraction has has 36 places, 29 transitions, 76 flow [2023-08-26 17:59:11,350 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 109.66666666666667) internal successors, (329), 3 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,350 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:11,351 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:59:11,351 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-08-26 17:59:11,352 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 2 more)] === [2023-08-26 17:59:11,352 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:11,352 INFO L85 PathProgramCache]: Analyzing trace with hash 31722972, now seen corresponding path program 1 times [2023-08-26 17:59:11,352 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:11,352 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986178226] [2023-08-26 17:59:11,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:11,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:11,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:11,376 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:11,376 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:11,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986178226] [2023-08-26 17:59:11,377 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986178226] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:11,377 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:11,377 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:11,377 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405484373] [2023-08-26 17:59:11,377 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:11,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:11,378 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:11,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:11,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:11,378 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 111 out of 267 [2023-08-26 17:59:11,379 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 36 places, 29 transitions, 76 flow. Second operand has 3 states, 3 states have (on average 112.33333333333333) internal successors, (337), 3 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,379 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:11,379 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 111 of 267 [2023-08-26 17:59:11,379 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:11,589 INFO L124 PetriNetUnfolderBase]: 1525/2241 cut-off events. [2023-08-26 17:59:11,590 INFO L125 PetriNetUnfolderBase]: For 128/128 co-relation queries the response was YES. [2023-08-26 17:59:11,593 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4588 conditions, 2241 events. 1525/2241 cut-off events. For 128/128 co-relation queries the response was YES. Maximal size of possible extension queue 158. Compared 11091 event pairs, 461 based on Foata normal form. 0/1801 useless extension candidates. Maximal degree in co-relation 4578. Up to 1621 conditions per place. [2023-08-26 17:59:11,599 INFO L140 encePairwiseOnDemand]: 260/267 looper letters, 40 selfloop transitions, 4 changer transitions 0/47 dead transitions. [2023-08-26 17:59:11,599 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 38 places, 47 transitions, 210 flow [2023-08-26 17:59:11,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:11,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:11,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 380 transitions. [2023-08-26 17:59:11,601 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47440699126092384 [2023-08-26 17:59:11,601 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 380 transitions. [2023-08-26 17:59:11,601 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 380 transitions. [2023-08-26 17:59:11,601 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:11,601 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 380 transitions. [2023-08-26 17:59:11,602 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 126.66666666666667) internal successors, (380), 3 states have internal predecessors, (380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,603 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,604 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,604 INFO L175 Difference]: Start difference. First operand has 36 places, 29 transitions, 76 flow. Second operand 3 states and 380 transitions. [2023-08-26 17:59:11,604 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 38 places, 47 transitions, 210 flow [2023-08-26 17:59:11,606 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 47 transitions, 209 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:59:11,607 INFO L231 Difference]: Finished difference. Result has 38 places, 32 transitions, 105 flow [2023-08-26 17:59:11,607 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=267, PETRI_DIFFERENCE_MINUEND_FLOW=75, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=105, PETRI_PLACES=38, PETRI_TRANSITIONS=32} [2023-08-26 17:59:11,608 INFO L281 CegarLoopForPetriNet]: 36 programPoint places, 2 predicate places. [2023-08-26 17:59:11,608 INFO L495 AbstractCegarLoop]: Abstraction has has 38 places, 32 transitions, 105 flow [2023-08-26 17:59:11,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 112.33333333333333) internal successors, (337), 3 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,608 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:11,608 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:59:11,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 17:59:11,608 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 2 more)] === [2023-08-26 17:59:11,609 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:11,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1988568048, now seen corresponding path program 1 times [2023-08-26 17:59:11,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:11,611 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381426242] [2023-08-26 17:59:11,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:11,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:11,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:11,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:59:11,654 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:11,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [381426242] [2023-08-26 17:59:11,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [381426242] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:11,655 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:11,655 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:59:11,655 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322069383] [2023-08-26 17:59:11,655 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:11,655 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:11,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:11,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:11,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:11,656 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 111 out of 267 [2023-08-26 17:59:11,656 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 38 places, 32 transitions, 105 flow. Second operand has 3 states, 3 states have (on average 114.0) internal successors, (342), 3 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,656 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:11,657 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 111 of 267 [2023-08-26 17:59:11,657 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:11,845 INFO L124 PetriNetUnfolderBase]: 1237/1837 cut-off events. [2023-08-26 17:59:11,845 INFO L125 PetriNetUnfolderBase]: For 326/326 co-relation queries the response was YES. [2023-08-26 17:59:11,847 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4110 conditions, 1837 events. 1237/1837 cut-off events. For 326/326 co-relation queries the response was YES. Maximal size of possible extension queue 108. Compared 8339 event pairs, 935 based on Foata normal form. 128/1929 useless extension candidates. Maximal degree in co-relation 4098. Up to 1755 conditions per place. [2023-08-26 17:59:11,849 INFO L140 encePairwiseOnDemand]: 263/267 looper letters, 0 selfloop transitions, 0 changer transitions 29/29 dead transitions. [2023-08-26 17:59:11,849 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 29 transitions, 145 flow [2023-08-26 17:59:11,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:11,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:11,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 359 transitions. [2023-08-26 17:59:11,851 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44818976279650435 [2023-08-26 17:59:11,851 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 359 transitions. [2023-08-26 17:59:11,851 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 359 transitions. [2023-08-26 17:59:11,851 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:11,852 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 359 transitions. [2023-08-26 17:59:11,852 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 119.66666666666667) internal successors, (359), 3 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,854 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,854 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 267.0) internal successors, (1068), 4 states have internal predecessors, (1068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,854 INFO L175 Difference]: Start difference. First operand has 38 places, 32 transitions, 105 flow. Second operand 3 states and 359 transitions. [2023-08-26 17:59:11,854 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 29 transitions, 145 flow [2023-08-26 17:59:11,855 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 36 places, 29 transitions, 141 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:59:11,855 INFO L231 Difference]: Finished difference. Result has 36 places, 0 transitions, 0 flow [2023-08-26 17:59:11,855 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=267, PETRI_DIFFERENCE_MINUEND_FLOW=89, PETRI_DIFFERENCE_MINUEND_PLACES=34, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=36, PETRI_TRANSITIONS=0} [2023-08-26 17:59:11,856 INFO L281 CegarLoopForPetriNet]: 36 programPoint places, 0 predicate places. [2023-08-26 17:59:11,856 INFO L495 AbstractCegarLoop]: Abstraction has has 36 places, 0 transitions, 0 flow [2023-08-26 17:59:11,856 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 114.0) internal successors, (342), 3 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:11,856 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 6 remaining) [2023-08-26 17:59:11,856 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 6 remaining) [2023-08-26 17:59:11,856 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 6 remaining) [2023-08-26 17:59:11,857 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 6 remaining) [2023-08-26 17:59:11,857 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 6 remaining) [2023-08-26 17:59:11,857 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 6 remaining) [2023-08-26 17:59:11,857 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 17:59:11,857 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 17:59:11,858 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 17:59:11,864 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 138 places, 138 transitions, 297 flow [2023-08-26 17:59:11,877 INFO L124 PetriNetUnfolderBase]: 10/178 cut-off events. [2023-08-26 17:59:11,878 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:59:11,878 INFO L83 FinitePrefix]: Finished finitePrefix Result has 194 conditions, 178 events. 10/178 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 445 event pairs, 0 based on Foata normal form. 0/153 useless extension candidates. Maximal degree in co-relation 131. Up to 8 conditions per place. [2023-08-26 17:59:11,879 INFO L82 GeneralOperation]: Start removeDead. Operand has 138 places, 138 transitions, 297 flow [2023-08-26 17:59:11,879 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 138 places, 138 transitions, 297 flow [2023-08-26 17:59:11,880 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:59:11,880 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 138 places, 138 transitions, 297 flow [2023-08-26 17:59:11,880 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 138 places, 138 transitions, 297 flow [2023-08-26 17:59:11,880 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 138 places, 138 transitions, 297 flow [2023-08-26 17:59:11,894 INFO L124 PetriNetUnfolderBase]: 10/178 cut-off events. [2023-08-26 17:59:11,895 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:59:11,895 INFO L83 FinitePrefix]: Finished finitePrefix Result has 194 conditions, 178 events. 10/178 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 445 event pairs, 0 based on Foata normal form. 0/153 useless extension candidates. Maximal degree in co-relation 131. Up to 8 conditions per place. [2023-08-26 17:59:11,900 INFO L119 LiptonReduction]: Number of co-enabled transitions 11232 [2023-08-26 17:59:14,052 INFO L134 LiptonReduction]: Checked pairs total: 14153 [2023-08-26 17:59:14,053 INFO L136 LiptonReduction]: Total number of compositions: 128 [2023-08-26 17:59:14,054 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 17:59:14,054 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;@6b5091fc, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:59:14,054 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 17:59:14,058 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:59:14,058 INFO L124 PetriNetUnfolderBase]: 3/45 cut-off events. [2023-08-26 17:59:14,058 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 17:59:14,058 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:14,058 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 17:59:14,058 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 17:59:14,058 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:14,058 INFO L85 PathProgramCache]: Analyzing trace with hash 658190996, now seen corresponding path program 1 times [2023-08-26 17:59:14,059 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:14,059 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102111305] [2023-08-26 17:59:14,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:14,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:14,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:59:14,081 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 17:59:14,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:59:14,092 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 17:59:14,093 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 17:59:14,093 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 17:59:14,093 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-26 17:59:14,093 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 17:59:14,094 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 17:59:14,094 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 17:59:14,094 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 17:59:14,138 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:59:14,140 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 175 places, 175 transitions, 382 flow [2023-08-26 17:59:14,160 INFO L124 PetriNetUnfolderBase]: 13/229 cut-off events. [2023-08-26 17:59:14,160 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 17:59:14,161 INFO L83 FinitePrefix]: Finished finitePrefix Result has 252 conditions, 229 events. 13/229 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 670 event pairs, 0 based on Foata normal form. 0/197 useless extension candidates. Maximal degree in co-relation 186. Up to 10 conditions per place. [2023-08-26 17:59:14,162 INFO L82 GeneralOperation]: Start removeDead. Operand has 175 places, 175 transitions, 382 flow [2023-08-26 17:59:14,163 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 175 places, 175 transitions, 382 flow [2023-08-26 17:59:14,163 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:59:14,163 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 175 places, 175 transitions, 382 flow [2023-08-26 17:59:14,163 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 175 places, 175 transitions, 382 flow [2023-08-26 17:59:14,164 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 175 places, 175 transitions, 382 flow [2023-08-26 17:59:14,188 INFO L124 PetriNetUnfolderBase]: 13/229 cut-off events. [2023-08-26 17:59:14,188 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 17:59:14,190 INFO L83 FinitePrefix]: Finished finitePrefix Result has 252 conditions, 229 events. 13/229 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 670 event pairs, 0 based on Foata normal form. 0/197 useless extension candidates. Maximal degree in co-relation 186. Up to 10 conditions per place. [2023-08-26 17:59:14,199 INFO L119 LiptonReduction]: Number of co-enabled transitions 20304 [2023-08-26 17:59:16,916 INFO L134 LiptonReduction]: Checked pairs total: 24676 [2023-08-26 17:59:16,916 INFO L136 LiptonReduction]: Total number of compositions: 168 [2023-08-26 17:59:16,917 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:59:16,917 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;@6b5091fc, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:59:16,917 INFO L358 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2023-08-26 17:59:16,918 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:59:16,918 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 17:59:16,918 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:59:16,918 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:16,919 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:59:16,919 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 17:59:16,919 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:16,919 INFO L85 PathProgramCache]: Analyzing trace with hash 49270, now seen corresponding path program 1 times [2023-08-26 17:59:16,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:16,919 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555373504] [2023-08-26 17:59:16,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:16,919 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:16,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:16,944 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:16,944 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:16,944 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555373504] [2023-08-26 17:59:16,944 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555373504] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:16,944 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:16,945 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:16,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876220596] [2023-08-26 17:59:16,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:16,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:16,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:16,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:16,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:16,946 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 140 out of 343 [2023-08-26 17:59:16,947 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 45 places, 40 transitions, 112 flow. Second operand has 3 states, 3 states have (on average 140.66666666666666) internal successors, (422), 3 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:16,947 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:16,947 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 140 of 343 [2023-08-26 17:59:16,947 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:19,690 INFO L124 PetriNetUnfolderBase]: 29814/39034 cut-off events. [2023-08-26 17:59:19,690 INFO L125 PetriNetUnfolderBase]: For 5058/5058 co-relation queries the response was YES. [2023-08-26 17:59:19,740 INFO L83 FinitePrefix]: Finished finitePrefix Result has 80171 conditions, 39034 events. 29814/39034 cut-off events. For 5058/5058 co-relation queries the response was YES. Maximal size of possible extension queue 1807. Compared 219809 event pairs, 25212 based on Foata normal form. 0/26400 useless extension candidates. Maximal degree in co-relation 9053. Up to 38217 conditions per place. [2023-08-26 17:59:19,890 INFO L140 encePairwiseOnDemand]: 340/343 looper letters, 34 selfloop transitions, 1 changer transitions 0/38 dead transitions. [2023-08-26 17:59:19,890 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 38 transitions, 178 flow [2023-08-26 17:59:19,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:19,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:19,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 457 transitions. [2023-08-26 17:59:19,892 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44412050534499514 [2023-08-26 17:59:19,892 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 457 transitions. [2023-08-26 17:59:19,892 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 457 transitions. [2023-08-26 17:59:19,892 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:19,892 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 457 transitions. [2023-08-26 17:59:19,893 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 152.33333333333334) internal successors, (457), 3 states have internal predecessors, (457), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:19,895 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 343.0) internal successors, (1372), 4 states have internal predecessors, (1372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:19,895 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 343.0) internal successors, (1372), 4 states have internal predecessors, (1372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:19,895 INFO L175 Difference]: Start difference. First operand has 45 places, 40 transitions, 112 flow. Second operand 3 states and 457 transitions. [2023-08-26 17:59:19,896 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 38 transitions, 178 flow [2023-08-26 17:59:19,901 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 38 transitions, 166 flow, removed 6 selfloop flow, removed 0 redundant places. [2023-08-26 17:59:19,902 INFO L231 Difference]: Finished difference. Result has 45 places, 38 transitions, 98 flow [2023-08-26 17:59:19,902 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=343, PETRI_DIFFERENCE_MINUEND_FLOW=96, PETRI_DIFFERENCE_MINUEND_PLACES=43, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=38, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=37, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=98, PETRI_PLACES=45, PETRI_TRANSITIONS=38} [2023-08-26 17:59:19,903 INFO L281 CegarLoopForPetriNet]: 45 programPoint places, 0 predicate places. [2023-08-26 17:59:19,903 INFO L495 AbstractCegarLoop]: Abstraction has has 45 places, 38 transitions, 98 flow [2023-08-26 17:59:19,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 140.66666666666666) internal successors, (422), 3 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:19,903 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:19,903 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:59:19,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-26 17:59:19,904 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 17:59:19,904 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:19,904 INFO L85 PathProgramCache]: Analyzing trace with hash 49269, now seen corresponding path program 1 times [2023-08-26 17:59:19,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:19,904 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316547820] [2023-08-26 17:59:19,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:19,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:19,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:19,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:19,930 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:19,930 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316547820] [2023-08-26 17:59:19,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1316547820] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:19,930 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:19,930 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:19,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699090560] [2023-08-26 17:59:19,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:19,932 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:19,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:19,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:19,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:19,933 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 139 out of 343 [2023-08-26 17:59:19,934 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 45 places, 38 transitions, 98 flow. Second operand has 3 states, 3 states have (on average 139.66666666666666) internal successors, (419), 3 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:19,934 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:19,934 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 139 of 343 [2023-08-26 17:59:19,934 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:21,344 INFO L124 PetriNetUnfolderBase]: 19076/25495 cut-off events. [2023-08-26 17:59:21,344 INFO L125 PetriNetUnfolderBase]: For 1115/1115 co-relation queries the response was YES. [2023-08-26 17:59:21,371 INFO L83 FinitePrefix]: Finished finitePrefix Result has 51625 conditions, 25495 events. 19076/25495 cut-off events. For 1115/1115 co-relation queries the response was YES. Maximal size of possible extension queue 1065. Compared 138274 event pairs, 16008 based on Foata normal form. 0/18730 useless extension candidates. Maximal degree in co-relation 51615. Up to 24678 conditions per place. [2023-08-26 17:59:21,452 INFO L140 encePairwiseOnDemand]: 341/343 looper letters, 33 selfloop transitions, 1 changer transitions 0/37 dead transitions. [2023-08-26 17:59:21,453 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 46 places, 37 transitions, 164 flow [2023-08-26 17:59:21,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:21,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:21,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 452 transitions. [2023-08-26 17:59:21,455 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4392614188532556 [2023-08-26 17:59:21,455 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 452 transitions. [2023-08-26 17:59:21,455 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 452 transitions. [2023-08-26 17:59:21,455 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:21,455 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 452 transitions. [2023-08-26 17:59:21,457 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 150.66666666666666) internal successors, (452), 3 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:21,458 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 343.0) internal successors, (1372), 4 states have internal predecessors, (1372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:21,459 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 343.0) internal successors, (1372), 4 states have internal predecessors, (1372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:21,459 INFO L175 Difference]: Start difference. First operand has 45 places, 38 transitions, 98 flow. Second operand 3 states and 452 transitions. [2023-08-26 17:59:21,459 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 46 places, 37 transitions, 164 flow [2023-08-26 17:59:21,461 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 37 transitions, 163 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:59:21,461 INFO L231 Difference]: Finished difference. Result has 45 places, 37 transitions, 97 flow [2023-08-26 17:59:21,462 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=343, PETRI_DIFFERENCE_MINUEND_FLOW=95, PETRI_DIFFERENCE_MINUEND_PLACES=43, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=37, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=36, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=97, PETRI_PLACES=45, PETRI_TRANSITIONS=37} [2023-08-26 17:59:21,462 INFO L281 CegarLoopForPetriNet]: 45 programPoint places, 0 predicate places. [2023-08-26 17:59:21,462 INFO L495 AbstractCegarLoop]: Abstraction has has 45 places, 37 transitions, 97 flow [2023-08-26 17:59:21,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 139.66666666666666) internal successors, (419), 3 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:21,463 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:21,463 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 17:59:21,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-08-26 17:59:21,463 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 17:59:21,464 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:21,464 INFO L85 PathProgramCache]: Analyzing trace with hash 47389809, now seen corresponding path program 1 times [2023-08-26 17:59:21,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:21,464 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736425220] [2023-08-26 17:59:21,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:21,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:21,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:21,483 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:21,484 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:21,484 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736425220] [2023-08-26 17:59:21,484 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736425220] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:21,484 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:21,484 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:21,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135567802] [2023-08-26 17:59:21,485 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:21,485 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:21,485 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:21,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:21,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:21,486 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 140 out of 343 [2023-08-26 17:59:21,487 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 45 places, 37 transitions, 97 flow. Second operand has 3 states, 3 states have (on average 141.33333333333334) internal successors, (424), 3 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:21,487 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:21,487 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 140 of 343 [2023-08-26 17:59:21,487 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:22,751 INFO L124 PetriNetUnfolderBase]: 15543/20499 cut-off events. [2023-08-26 17:59:22,751 INFO L125 PetriNetUnfolderBase]: For 942/942 co-relation queries the response was YES. [2023-08-26 17:59:22,773 INFO L83 FinitePrefix]: Finished finitePrefix Result has 41823 conditions, 20499 events. 15543/20499 cut-off events. For 942/942 co-relation queries the response was YES. Maximal size of possible extension queue 1015. Compared 110188 event pairs, 4221 based on Foata normal form. 0/15984 useless extension candidates. Maximal degree in co-relation 41812. Up to 17335 conditions per place. [2023-08-26 17:59:22,820 INFO L140 encePairwiseOnDemand]: 334/343 looper letters, 53 selfloop transitions, 5 changer transitions 0/61 dead transitions. [2023-08-26 17:59:22,820 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 47 places, 61 transitions, 276 flow [2023-08-26 17:59:22,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:22,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:22,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 482 transitions. [2023-08-26 17:59:22,825 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4684159378036929 [2023-08-26 17:59:22,825 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 482 transitions. [2023-08-26 17:59:22,825 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 482 transitions. [2023-08-26 17:59:22,826 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:22,826 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 482 transitions. [2023-08-26 17:59:22,828 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 160.66666666666666) internal successors, (482), 3 states have internal predecessors, (482), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:22,830 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 343.0) internal successors, (1372), 4 states have internal predecessors, (1372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:22,831 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 343.0) internal successors, (1372), 4 states have internal predecessors, (1372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:22,831 INFO L175 Difference]: Start difference. First operand has 45 places, 37 transitions, 97 flow. Second operand 3 states and 482 transitions. [2023-08-26 17:59:22,831 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 47 places, 61 transitions, 276 flow [2023-08-26 17:59:22,833 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 46 places, 61 transitions, 275 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:59:22,835 INFO L231 Difference]: Finished difference. Result has 47 places, 41 transitions, 135 flow [2023-08-26 17:59:22,835 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=343, PETRI_DIFFERENCE_MINUEND_FLOW=96, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=37, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=32, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=135, PETRI_PLACES=47, PETRI_TRANSITIONS=41} [2023-08-26 17:59:22,835 INFO L281 CegarLoopForPetriNet]: 45 programPoint places, 2 predicate places. [2023-08-26 17:59:22,835 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 41 transitions, 135 flow [2023-08-26 17:59:22,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 141.33333333333334) internal successors, (424), 3 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:22,836 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:22,836 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 17:59:22,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-26 17:59:22,836 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 17:59:22,836 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:22,837 INFO L85 PathProgramCache]: Analyzing trace with hash -276308368, now seen corresponding path program 1 times [2023-08-26 17:59:22,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:22,837 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454363561] [2023-08-26 17:59:22,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:22,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:22,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:22,901 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 17:59:22,901 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:22,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454363561] [2023-08-26 17:59:22,902 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454363561] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:22,902 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:22,902 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 17:59:22,903 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553971448] [2023-08-26 17:59:22,903 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:22,903 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:22,903 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:22,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:22,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:22,904 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 140 out of 343 [2023-08-26 17:59:22,904 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 47 places, 41 transitions, 135 flow. Second operand has 3 states, 3 states have (on average 143.0) internal successors, (429), 3 states have internal predecessors, (429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:22,905 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:22,905 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 140 of 343 [2023-08-26 17:59:22,905 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:23,726 INFO L124 PetriNetUnfolderBase]: 10525/14077 cut-off events. [2023-08-26 17:59:23,727 INFO L125 PetriNetUnfolderBase]: For 2790/2790 co-relation queries the response was YES. [2023-08-26 17:59:23,746 INFO L83 FinitePrefix]: Finished finitePrefix Result has 31223 conditions, 14077 events. 10525/14077 cut-off events. For 2790/2790 co-relation queries the response was YES. Maximal size of possible extension queue 575. Compared 70129 event pairs, 7967 based on Foata normal form. 1344/15217 useless extension candidates. Maximal degree in co-relation 31210. Up to 13635 conditions per place. [2023-08-26 17:59:23,754 INFO L140 encePairwiseOnDemand]: 338/343 looper letters, 0 selfloop transitions, 0 changer transitions 37/37 dead transitions. [2023-08-26 17:59:23,755 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 37 transitions, 187 flow [2023-08-26 17:59:23,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:23,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:23,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 454 transitions. [2023-08-26 17:59:23,756 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4412050534499514 [2023-08-26 17:59:23,756 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 454 transitions. [2023-08-26 17:59:23,756 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 454 transitions. [2023-08-26 17:59:23,757 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:23,757 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 454 transitions. [2023-08-26 17:59:23,758 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 151.33333333333334) internal successors, (454), 3 states have internal predecessors, (454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:23,759 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 343.0) internal successors, (1372), 4 states have internal predecessors, (1372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:23,760 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 343.0) internal successors, (1372), 4 states have internal predecessors, (1372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:23,760 INFO L175 Difference]: Start difference. First operand has 47 places, 41 transitions, 135 flow. Second operand 3 states and 454 transitions. [2023-08-26 17:59:23,760 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 37 transitions, 187 flow [2023-08-26 17:59:23,765 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 44 places, 37 transitions, 182 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 17:59:23,765 INFO L231 Difference]: Finished difference. Result has 44 places, 0 transitions, 0 flow [2023-08-26 17:59:23,765 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=343, PETRI_DIFFERENCE_MINUEND_FLOW=114, PETRI_DIFFERENCE_MINUEND_PLACES=42, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=37, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=37, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=44, PETRI_TRANSITIONS=0} [2023-08-26 17:59:23,766 INFO L281 CegarLoopForPetriNet]: 45 programPoint places, -1 predicate places. [2023-08-26 17:59:23,766 INFO L495 AbstractCegarLoop]: Abstraction has has 44 places, 0 transitions, 0 flow [2023-08-26 17:59:23,766 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 143.0) internal successors, (429), 3 states have internal predecessors, (429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:23,766 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 7 remaining) [2023-08-26 17:59:23,766 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 7 remaining) [2023-08-26 17:59:23,766 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 7 remaining) [2023-08-26 17:59:23,766 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 7 remaining) [2023-08-26 17:59:23,767 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 7 remaining) [2023-08-26 17:59:23,767 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 7 remaining) [2023-08-26 17:59:23,767 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 7 remaining) [2023-08-26 17:59:23,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-08-26 17:59:23,767 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 17:59:23,767 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 17:59:23,769 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 175 places, 175 transitions, 382 flow [2023-08-26 17:59:23,788 INFO L124 PetriNetUnfolderBase]: 13/229 cut-off events. [2023-08-26 17:59:23,788 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 17:59:23,790 INFO L83 FinitePrefix]: Finished finitePrefix Result has 252 conditions, 229 events. 13/229 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 670 event pairs, 0 based on Foata normal form. 0/197 useless extension candidates. Maximal degree in co-relation 186. Up to 10 conditions per place. [2023-08-26 17:59:23,790 INFO L82 GeneralOperation]: Start removeDead. Operand has 175 places, 175 transitions, 382 flow [2023-08-26 17:59:23,791 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 175 places, 175 transitions, 382 flow [2023-08-26 17:59:23,791 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:59:23,791 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 175 places, 175 transitions, 382 flow [2023-08-26 17:59:23,791 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 175 places, 175 transitions, 382 flow [2023-08-26 17:59:23,791 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 175 places, 175 transitions, 382 flow [2023-08-26 17:59:23,810 INFO L124 PetriNetUnfolderBase]: 13/229 cut-off events. [2023-08-26 17:59:23,810 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 17:59:23,811 INFO L83 FinitePrefix]: Finished finitePrefix Result has 252 conditions, 229 events. 13/229 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 670 event pairs, 0 based on Foata normal form. 0/197 useless extension candidates. Maximal degree in co-relation 186. Up to 10 conditions per place. [2023-08-26 17:59:23,816 INFO L119 LiptonReduction]: Number of co-enabled transitions 20304 [2023-08-26 17:59:26,496 INFO L134 LiptonReduction]: Checked pairs total: 24643 [2023-08-26 17:59:26,496 INFO L136 LiptonReduction]: Total number of compositions: 167 [2023-08-26 17:59:26,498 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 17:59:26,498 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;@6b5091fc, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:59:26,498 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 17:59:26,502 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:59:26,502 INFO L124 PetriNetUnfolderBase]: 4/59 cut-off events. [2023-08-26 17:59:26,502 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 17:59:26,503 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:26,503 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 17:59:26,503 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 17:59:26,503 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:26,503 INFO L85 PathProgramCache]: Analyzing trace with hash 682046956, now seen corresponding path program 1 times [2023-08-26 17:59:26,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:26,503 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382113822] [2023-08-26 17:59:26,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:26,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:26,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:59:26,513 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 17:59:26,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 17:59:26,524 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 17:59:26,525 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 17:59:26,525 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 17:59:26,525 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-08-26 17:59:26,525 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 17:59:26,526 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 17:59:26,526 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 17:59:26,526 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-26 17:59:26,600 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 17:59:26,602 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 212 places, 212 transitions, 469 flow [2023-08-26 17:59:26,640 INFO L124 PetriNetUnfolderBase]: 16/280 cut-off events. [2023-08-26 17:59:26,640 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 17:59:26,642 INFO L83 FinitePrefix]: Finished finitePrefix Result has 311 conditions, 280 events. 16/280 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 909 event pairs, 0 based on Foata normal form. 0/241 useless extension candidates. Maximal degree in co-relation 242. Up to 12 conditions per place. [2023-08-26 17:59:26,643 INFO L82 GeneralOperation]: Start removeDead. Operand has 212 places, 212 transitions, 469 flow [2023-08-26 17:59:26,644 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 212 places, 212 transitions, 469 flow [2023-08-26 17:59:26,644 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 17:59:26,645 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 212 places, 212 transitions, 469 flow [2023-08-26 17:59:26,645 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 212 places, 212 transitions, 469 flow [2023-08-26 17:59:26,645 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 212 places, 212 transitions, 469 flow [2023-08-26 17:59:26,681 INFO L124 PetriNetUnfolderBase]: 16/280 cut-off events. [2023-08-26 17:59:26,681 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 17:59:26,683 INFO L83 FinitePrefix]: Finished finitePrefix Result has 311 conditions, 280 events. 16/280 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 909 event pairs, 0 based on Foata normal form. 0/241 useless extension candidates. Maximal degree in co-relation 242. Up to 12 conditions per place. [2023-08-26 17:59:26,693 INFO L119 LiptonReduction]: Number of co-enabled transitions 32040 [2023-08-26 17:59:30,202 INFO L134 LiptonReduction]: Checked pairs total: 38676 [2023-08-26 17:59:30,202 INFO L136 LiptonReduction]: Total number of compositions: 202 [2023-08-26 17:59:30,203 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 17:59:30,204 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;@6b5091fc, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 17:59:30,204 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-08-26 17:59:30,204 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 17:59:30,205 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 17:59:30,205 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 17:59:30,205 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:30,205 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:59:30,205 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-26 17:59:30,205 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:30,205 INFO L85 PathProgramCache]: Analyzing trace with hash 69240, now seen corresponding path program 1 times [2023-08-26 17:59:30,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:30,205 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422417579] [2023-08-26 17:59:30,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:30,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:30,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:30,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:30,236 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:30,236 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422417579] [2023-08-26 17:59:30,236 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [422417579] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:30,236 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:30,236 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:30,236 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506295247] [2023-08-26 17:59:30,236 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:30,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:30,237 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:30,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:30,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:30,238 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 171 out of 414 [2023-08-26 17:59:30,239 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 48 transitions, 141 flow. Second operand has 3 states, 3 states have (on average 171.66666666666666) internal successors, (515), 3 states have internal predecessors, (515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:30,239 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:30,239 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 171 of 414 [2023-08-26 17:59:30,239 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 17:59:51,406 INFO L124 PetriNetUnfolderBase]: 267513/332054 cut-off events. [2023-08-26 17:59:51,406 INFO L125 PetriNetUnfolderBase]: For 55528/55528 co-relation queries the response was YES. [2023-08-26 17:59:51,832 INFO L83 FinitePrefix]: Finished finitePrefix Result has 683313 conditions, 332054 events. 267513/332054 cut-off events. For 55528/55528 co-relation queries the response was YES. Maximal size of possible extension queue 11532. Compared 1942117 event pairs, 226896 based on Foata normal form. 0/226809 useless extension candidates. Maximal degree in co-relation 80810. Up to 326337 conditions per place. [2023-08-26 17:59:53,032 INFO L140 encePairwiseOnDemand]: 411/414 looper letters, 42 selfloop transitions, 1 changer transitions 0/46 dead transitions. [2023-08-26 17:59:53,032 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 54 places, 46 transitions, 223 flow [2023-08-26 17:59:53,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 17:59:53,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 17:59:53,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 558 transitions. [2023-08-26 17:59:53,034 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4492753623188406 [2023-08-26 17:59:53,034 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 558 transitions. [2023-08-26 17:59:53,034 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 558 transitions. [2023-08-26 17:59:53,034 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 17:59:53,034 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 558 transitions. [2023-08-26 17:59:53,036 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 186.0) internal successors, (558), 3 states have internal predecessors, (558), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:53,038 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 414.0) internal successors, (1656), 4 states have internal predecessors, (1656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:53,038 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 414.0) internal successors, (1656), 4 states have internal predecessors, (1656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:53,038 INFO L175 Difference]: Start difference. First operand has 54 places, 48 transitions, 141 flow. Second operand 3 states and 558 transitions. [2023-08-26 17:59:53,038 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 54 places, 46 transitions, 223 flow [2023-08-26 17:59:53,125 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 46 transitions, 203 flow, removed 10 selfloop flow, removed 0 redundant places. [2023-08-26 17:59:53,126 INFO L231 Difference]: Finished difference. Result has 54 places, 46 transitions, 119 flow [2023-08-26 17:59:53,126 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=414, PETRI_DIFFERENCE_MINUEND_FLOW=117, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=46, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=45, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=119, PETRI_PLACES=54, PETRI_TRANSITIONS=46} [2023-08-26 17:59:53,127 INFO L281 CegarLoopForPetriNet]: 54 programPoint places, 0 predicate places. [2023-08-26 17:59:53,127 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 46 transitions, 119 flow [2023-08-26 17:59:53,127 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 171.66666666666666) internal successors, (515), 3 states have internal predecessors, (515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:53,127 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 17:59:53,127 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 17:59:53,128 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2023-08-26 17:59:53,128 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-26 17:59:53,128 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 17:59:53,128 INFO L85 PathProgramCache]: Analyzing trace with hash 69239, now seen corresponding path program 1 times [2023-08-26 17:59:53,128 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 17:59:53,128 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712970123] [2023-08-26 17:59:53,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 17:59:53,128 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 17:59:53,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 17:59:53,144 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 17:59:53,144 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 17:59:53,144 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712970123] [2023-08-26 17:59:53,144 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [712970123] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 17:59:53,144 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 17:59:53,144 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 17:59:53,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318968176] [2023-08-26 17:59:53,144 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 17:59:53,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 17:59:53,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 17:59:53,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 17:59:53,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 17:59:53,146 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 170 out of 414 [2023-08-26 17:59:53,146 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 46 transitions, 119 flow. Second operand has 3 states, 3 states have (on average 170.66666666666666) internal successors, (512), 3 states have internal predecessors, (512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 17:59:53,147 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 17:59:53,148 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 170 of 414 [2023-08-26 17:59:53,148 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:00:05,927 INFO L124 PetriNetUnfolderBase]: 172740/217673 cut-off events. [2023-08-26 18:00:05,927 INFO L125 PetriNetUnfolderBase]: For 7828/7828 co-relation queries the response was YES. [2023-08-26 18:00:06,324 INFO L83 FinitePrefix]: Finished finitePrefix Result has 439755 conditions, 217673 events. 172740/217673 cut-off events. For 7828/7828 co-relation queries the response was YES. Maximal size of possible extension queue 6786. Compared 1249032 event pairs, 145662 based on Foata normal form. 0/159114 useless extension candidates. Maximal degree in co-relation 439744. Up to 211956 conditions per place. [2023-08-26 18:00:06,951 INFO L140 encePairwiseOnDemand]: 412/414 looper letters, 41 selfloop transitions, 1 changer transitions 0/45 dead transitions. [2023-08-26 18:00:06,951 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 45 transitions, 201 flow [2023-08-26 18:00:06,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:00:06,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:00:06,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 553 transitions. [2023-08-26 18:00:06,953 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44524959742351045 [2023-08-26 18:00:06,953 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 553 transitions. [2023-08-26 18:00:06,954 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 553 transitions. [2023-08-26 18:00:06,954 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:00:06,954 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 553 transitions. [2023-08-26 18:00:06,955 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 184.33333333333334) internal successors, (553), 3 states have internal predecessors, (553), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:06,957 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 414.0) internal successors, (1656), 4 states have internal predecessors, (1656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:06,957 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 414.0) internal successors, (1656), 4 states have internal predecessors, (1656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:06,957 INFO L175 Difference]: Start difference. First operand has 54 places, 46 transitions, 119 flow. Second operand 3 states and 553 transitions. [2023-08-26 18:00:06,958 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 45 transitions, 201 flow [2023-08-26 18:00:06,976 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 45 transitions, 200 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:00:06,977 INFO L231 Difference]: Finished difference. Result has 54 places, 45 transitions, 118 flow [2023-08-26 18:00:06,978 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=414, PETRI_DIFFERENCE_MINUEND_FLOW=116, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=45, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=44, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=118, PETRI_PLACES=54, PETRI_TRANSITIONS=45} [2023-08-26 18:00:06,978 INFO L281 CegarLoopForPetriNet]: 54 programPoint places, 0 predicate places. [2023-08-26 18:00:06,978 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 45 transitions, 118 flow [2023-08-26 18:00:06,978 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 170.66666666666666) internal successors, (512), 3 states have internal predecessors, (512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:06,979 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:00:06,979 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 18:00:06,979 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2023-08-26 18:00:06,979 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-26 18:00:06,979 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:00:06,979 INFO L85 PathProgramCache]: Analyzing trace with hash 66599668, now seen corresponding path program 1 times [2023-08-26 18:00:06,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:00:06,979 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853982321] [2023-08-26 18:00:06,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:00:06,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:00:06,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:00:06,998 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 18:00:06,998 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:00:06,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853982321] [2023-08-26 18:00:06,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1853982321] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:00:06,998 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:00:06,998 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:00:06,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928355835] [2023-08-26 18:00:06,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:00:06,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:00:06,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:00:07,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:00:07,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:00:07,000 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 169 out of 414 [2023-08-26 18:00:07,001 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 45 transitions, 118 flow. Second operand has 3 states, 3 states have (on average 170.33333333333334) internal successors, (511), 3 states have internal predecessors, (511), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:07,001 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:00:07,001 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 169 of 414 [2023-08-26 18:00:07,001 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:00:17,302 INFO L124 PetriNetUnfolderBase]: 146239/181311 cut-off events. [2023-08-26 18:00:17,302 INFO L125 PetriNetUnfolderBase]: For 6910/6910 co-relation queries the response was YES. [2023-08-26 18:00:17,649 INFO L83 FinitePrefix]: Finished finitePrefix Result has 369032 conditions, 181311 events. 146239/181311 cut-off events. For 6910/6910 co-relation queries the response was YES. Maximal size of possible extension queue 6701. Compared 1020209 event pairs, 38427 based on Foata normal form. 0/138378 useless extension candidates. Maximal degree in co-relation 369020. Up to 165923 conditions per place. [2023-08-26 18:00:18,114 INFO L140 encePairwiseOnDemand]: 403/414 looper letters, 66 selfloop transitions, 6 changer transitions 0/75 dead transitions. [2023-08-26 18:00:18,114 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 56 places, 75 transitions, 342 flow [2023-08-26 18:00:18,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:00:18,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:00:18,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 584 transitions. [2023-08-26 18:00:18,116 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47020933977455714 [2023-08-26 18:00:18,116 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 584 transitions. [2023-08-26 18:00:18,116 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 584 transitions. [2023-08-26 18:00:18,117 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:00:18,117 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 584 transitions. [2023-08-26 18:00:18,118 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 194.66666666666666) internal successors, (584), 3 states have internal predecessors, (584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:18,120 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 414.0) internal successors, (1656), 4 states have internal predecessors, (1656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:18,120 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 414.0) internal successors, (1656), 4 states have internal predecessors, (1656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:18,120 INFO L175 Difference]: Start difference. First operand has 54 places, 45 transitions, 118 flow. Second operand 3 states and 584 transitions. [2023-08-26 18:00:18,120 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 56 places, 75 transitions, 342 flow [2023-08-26 18:00:18,121 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 55 places, 75 transitions, 341 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:00:18,122 INFO L231 Difference]: Finished difference. Result has 56 places, 50 transitions, 165 flow [2023-08-26 18:00:18,122 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=414, PETRI_DIFFERENCE_MINUEND_FLOW=117, PETRI_DIFFERENCE_MINUEND_PLACES=53, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=45, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=165, PETRI_PLACES=56, PETRI_TRANSITIONS=50} [2023-08-26 18:00:18,123 INFO L281 CegarLoopForPetriNet]: 54 programPoint places, 2 predicate places. [2023-08-26 18:00:18,123 INFO L495 AbstractCegarLoop]: Abstraction has has 56 places, 50 transitions, 165 flow [2023-08-26 18:00:18,123 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 170.33333333333334) internal successors, (511), 3 states have internal predecessors, (511), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:18,123 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:00:18,123 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:00:18,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-08-26 18:00:18,123 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-26 18:00:18,124 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:00:18,124 INFO L85 PathProgramCache]: Analyzing trace with hash 240285049, now seen corresponding path program 1 times [2023-08-26 18:00:18,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:00:18,124 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767970427] [2023-08-26 18:00:18,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:00:18,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:00:18,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:00:18,184 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 18:00:18,185 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:00:18,185 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767970427] [2023-08-26 18:00:18,185 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767970427] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:00:18,185 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:00:18,185 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:00:18,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277624025] [2023-08-26 18:00:18,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:00:18,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:00:18,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:00:18,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:00:18,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:00:18,188 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 169 out of 414 [2023-08-26 18:00:18,188 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 56 places, 50 transitions, 165 flow. Second operand has 3 states, 3 states have (on average 172.0) internal successors, (516), 3 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:18,188 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:00:18,189 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 169 of 414 [2023-08-26 18:00:18,189 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:00:24,754 INFO L124 PetriNetUnfolderBase]: 81805/102893 cut-off events. [2023-08-26 18:00:24,754 INFO L125 PetriNetUnfolderBase]: For 21702/21702 co-relation queries the response was YES. [2023-08-26 18:00:24,949 INFO L83 FinitePrefix]: Finished finitePrefix Result has 226856 conditions, 102893 events. 81805/102893 cut-off events. For 21702/21702 co-relation queries the response was YES. Maximal size of possible extension queue 3167. Compared 542182 event pairs, 62095 based on Foata normal form. 11744/113472 useless extension candidates. Maximal degree in co-relation 226842. Up to 100467 conditions per place. [2023-08-26 18:00:25,003 INFO L140 encePairwiseOnDemand]: 408/414 looper letters, 0 selfloop transitions, 0 changer transitions 45/45 dead transitions. [2023-08-26 18:00:25,003 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 53 places, 45 transitions, 229 flow [2023-08-26 18:00:25,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:00:25,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:00:25,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 549 transitions. [2023-08-26 18:00:25,005 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4420289855072464 [2023-08-26 18:00:25,005 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 549 transitions. [2023-08-26 18:00:25,005 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 549 transitions. [2023-08-26 18:00:25,005 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:00:25,005 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 549 transitions. [2023-08-26 18:00:25,006 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 183.0) internal successors, (549), 3 states have internal predecessors, (549), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:25,009 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 414.0) internal successors, (1656), 4 states have internal predecessors, (1656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:25,009 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 414.0) internal successors, (1656), 4 states have internal predecessors, (1656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:25,009 INFO L175 Difference]: Start difference. First operand has 56 places, 50 transitions, 165 flow. Second operand 3 states and 549 transitions. [2023-08-26 18:00:25,010 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 53 places, 45 transitions, 229 flow [2023-08-26 18:00:25,016 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 52 places, 45 transitions, 223 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:00:25,016 INFO L231 Difference]: Finished difference. Result has 52 places, 0 transitions, 0 flow [2023-08-26 18:00:25,017 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=414, PETRI_DIFFERENCE_MINUEND_FLOW=139, PETRI_DIFFERENCE_MINUEND_PLACES=50, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=45, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=45, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=52, PETRI_TRANSITIONS=0} [2023-08-26 18:00:25,017 INFO L281 CegarLoopForPetriNet]: 54 programPoint places, -2 predicate places. [2023-08-26 18:00:25,017 INFO L495 AbstractCegarLoop]: Abstraction has has 52 places, 0 transitions, 0 flow [2023-08-26 18:00:25,017 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 172.0) internal successors, (516), 3 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:25,018 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (7 of 8 remaining) [2023-08-26 18:00:25,018 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 8 remaining) [2023-08-26 18:00:25,018 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 8 remaining) [2023-08-26 18:00:25,018 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 8 remaining) [2023-08-26 18:00:25,018 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 8 remaining) [2023-08-26 18:00:25,018 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 8 remaining) [2023-08-26 18:00:25,018 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 8 remaining) [2023-08-26 18:00:25,019 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 8 remaining) [2023-08-26 18:00:25,019 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2023-08-26 18:00:25,019 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 18:00:25,019 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:00:25,022 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 212 places, 212 transitions, 469 flow [2023-08-26 18:00:25,048 INFO L124 PetriNetUnfolderBase]: 16/280 cut-off events. [2023-08-26 18:00:25,048 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 18:00:25,050 INFO L83 FinitePrefix]: Finished finitePrefix Result has 311 conditions, 280 events. 16/280 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 909 event pairs, 0 based on Foata normal form. 0/241 useless extension candidates. Maximal degree in co-relation 242. Up to 12 conditions per place. [2023-08-26 18:00:25,050 INFO L82 GeneralOperation]: Start removeDead. Operand has 212 places, 212 transitions, 469 flow [2023-08-26 18:00:25,050 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 212 places, 212 transitions, 469 flow [2023-08-26 18:00:25,051 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:00:25,051 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 212 places, 212 transitions, 469 flow [2023-08-26 18:00:25,051 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 212 places, 212 transitions, 469 flow [2023-08-26 18:00:25,051 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 212 places, 212 transitions, 469 flow [2023-08-26 18:00:25,070 INFO L124 PetriNetUnfolderBase]: 16/280 cut-off events. [2023-08-26 18:00:25,071 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 18:00:25,072 INFO L83 FinitePrefix]: Finished finitePrefix Result has 311 conditions, 280 events. 16/280 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 909 event pairs, 0 based on Foata normal form. 0/241 useless extension candidates. Maximal degree in co-relation 242. Up to 12 conditions per place. [2023-08-26 18:00:25,079 INFO L119 LiptonReduction]: Number of co-enabled transitions 32040 [2023-08-26 18:00:28,357 INFO L134 LiptonReduction]: Checked pairs total: 38713 [2023-08-26 18:00:28,357 INFO L136 LiptonReduction]: Total number of compositions: 200 [2023-08-26 18:00:28,361 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:00:28,362 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;@6b5091fc, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:00:28,362 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:00:28,367 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:00:28,367 INFO L124 PetriNetUnfolderBase]: 5/74 cut-off events. [2023-08-26 18:00:28,367 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 18:00:28,367 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:00:28,368 INFO L208 CegarLoopForPetriNet]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:00:28,368 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:00:28,368 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:00:28,368 INFO L85 PathProgramCache]: Analyzing trace with hash -989919548, now seen corresponding path program 1 times [2023-08-26 18:00:28,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:00:28,368 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58816519] [2023-08-26 18:00:28,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:00:28,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:00:28,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:00:28,384 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:00:28,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:00:28,402 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:00:28,402 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:00:28,402 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:00:28,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2023-08-26 18:00:28,402 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:00:28,405 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:00:28,405 WARN L233 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:00:28,405 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2023-08-26 18:00:28,437 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:00:28,440 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 249 places, 249 transitions, 558 flow [2023-08-26 18:00:28,474 INFO L124 PetriNetUnfolderBase]: 19/331 cut-off events. [2023-08-26 18:00:28,475 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-26 18:00:28,477 INFO L83 FinitePrefix]: Finished finitePrefix Result has 371 conditions, 331 events. 19/331 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 1131 event pairs, 0 based on Foata normal form. 0/285 useless extension candidates. Maximal degree in co-relation 301. Up to 14 conditions per place. [2023-08-26 18:00:28,477 INFO L82 GeneralOperation]: Start removeDead. Operand has 249 places, 249 transitions, 558 flow [2023-08-26 18:00:28,479 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 249 places, 249 transitions, 558 flow [2023-08-26 18:00:28,479 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:00:28,479 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 249 places, 249 transitions, 558 flow [2023-08-26 18:00:28,479 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 249 places, 249 transitions, 558 flow [2023-08-26 18:00:28,479 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 249 places, 249 transitions, 558 flow [2023-08-26 18:00:28,506 INFO L124 PetriNetUnfolderBase]: 19/331 cut-off events. [2023-08-26 18:00:28,507 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-26 18:00:28,509 INFO L83 FinitePrefix]: Finished finitePrefix Result has 371 conditions, 331 events. 19/331 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 1131 event pairs, 0 based on Foata normal form. 0/285 useless extension candidates. Maximal degree in co-relation 301. Up to 14 conditions per place. [2023-08-26 18:00:28,522 INFO L119 LiptonReduction]: Number of co-enabled transitions 46440 [2023-08-26 18:00:32,338 INFO L134 LiptonReduction]: Checked pairs total: 58762 [2023-08-26 18:00:32,339 INFO L136 LiptonReduction]: Total number of compositions: 241 [2023-08-26 18:00:32,340 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:00:32,340 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;@6b5091fc, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:00:32,340 INFO L358 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2023-08-26 18:00:32,341 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:00:32,341 INFO L124 PetriNetUnfolderBase]: 0/3 cut-off events. [2023-08-26 18:00:32,341 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:00:32,341 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:00:32,341 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:00:32,341 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 18:00:32,341 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:00:32,341 INFO L85 PathProgramCache]: Analyzing trace with hash 92226, now seen corresponding path program 1 times [2023-08-26 18:00:32,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:00:32,342 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651817561] [2023-08-26 18:00:32,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:00:32,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:00:32,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:00:32,360 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 18:00:32,360 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:00:32,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651817561] [2023-08-26 18:00:32,360 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651817561] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:00:32,360 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:00:32,360 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:00:32,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599295810] [2023-08-26 18:00:32,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:00:32,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:00:32,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:00:32,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:00:32,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:00:32,362 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 201 out of 490 [2023-08-26 18:00:32,363 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 56 transitions, 172 flow. Second operand has 3 states, 3 states have (on average 201.66666666666666) internal successors, (605), 3 states have internal predecessors, (605), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:00:32,363 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:00:32,363 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 201 of 490 [2023-08-26 18:00:32,363 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand