./Ultimate.py --spec ../sv-benchmarks/c/properties/no-overflow.prp --file ../sv-benchmarks/c/pthread-ext/35_double_lock_p3_vs.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 798a7b37 Calling Ultimate with: /root/.sdkman/candidates/java/21.0.5-tem/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/pthread-ext/35_double_lock_p3_vs.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Overflow-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 22ba795826618dfa50b90a88d5a4c30adee7dfead438325f939eb97a379da897 --- Real Ultimate output --- This is Ultimate 0.3.0-?-798a7b3-m [2025-03-04 15:09:50,907 INFO L188 SettingsManager]: Resetting all preferences to default values... [2025-03-04 15:09:50,954 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Overflow-32bit-Automizer_Default.epf [2025-03-04 15:09:50,957 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2025-03-04 15:09:50,957 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2025-03-04 15:09:50,977 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2025-03-04 15:09:50,977 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2025-03-04 15:09:50,978 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2025-03-04 15:09:50,978 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2025-03-04 15:09:50,978 INFO L153 SettingsManager]: * Use memory slicer=true [2025-03-04 15:09:50,979 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2025-03-04 15:09:50,979 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2025-03-04 15:09:50,979 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2025-03-04 15:09:50,979 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2025-03-04 15:09:50,980 INFO L153 SettingsManager]: * Use SBE=true [2025-03-04 15:09:50,980 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2025-03-04 15:09:50,980 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2025-03-04 15:09:50,980 INFO L153 SettingsManager]: * sizeof long=4 [2025-03-04 15:09:50,980 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2025-03-04 15:09:50,980 INFO L153 SettingsManager]: * sizeof POINTER=4 [2025-03-04 15:09:50,980 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2025-03-04 15:09:50,980 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2025-03-04 15:09:50,981 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2025-03-04 15:09:50,981 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2025-03-04 15:09:50,981 INFO L153 SettingsManager]: * Check absence of signed integer overflows=ASSERTandASSUME [2025-03-04 15:09:50,981 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2025-03-04 15:09:50,981 INFO L153 SettingsManager]: * sizeof long double=12 [2025-03-04 15:09:50,981 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2025-03-04 15:09:50,981 INFO L153 SettingsManager]: * Behaviour of calls to undefined functions=OVERAPPROXIMATE_BEHAVIOUR [2025-03-04 15:09:50,981 INFO L153 SettingsManager]: * Use constant arrays=true [2025-03-04 15:09:50,981 INFO L151 SettingsManager]: Preferences of IcfgBuilder differ from their defaults: [2025-03-04 15:09:50,981 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2025-03-04 15:09:50,982 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2025-03-04 15:09:50,982 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2025-03-04 15:09:50,982 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-03-04 15:09:50,982 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2025-03-04 15:09:50,982 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2025-03-04 15:09:50,982 INFO L153 SettingsManager]: * Compute procedure contracts=false [2025-03-04 15:09:50,982 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2025-03-04 15:09:50,982 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2025-03-04 15:09:50,982 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2025-03-04 15:09:50,982 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2025-03-04 15:09:50,982 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2025-03-04 15:09:50,982 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2025-03-04 15:09:50,983 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2025-03-04 15:09:50,983 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 22ba795826618dfa50b90a88d5a4c30adee7dfead438325f939eb97a379da897 [2025-03-04 15:09:51,187 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2025-03-04 15:09:51,194 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2025-03-04 15:09:51,196 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2025-03-04 15:09:51,196 INFO L270 PluginConnector]: Initializing CDTParser... [2025-03-04 15:09:51,197 INFO L274 PluginConnector]: CDTParser initialized [2025-03-04 15:09:51,198 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/pthread-ext/35_double_lock_p3_vs.i [2025-03-04 15:09:52,371 INFO L533 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aa234a3d8/0fc8737c08174ec1ae04ce0536f91d0c/FLAGc515ece02 [2025-03-04 15:09:52,657 INFO L384 CDTParser]: Found 1 translation units. [2025-03-04 15:09:52,658 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-ext/35_double_lock_p3_vs.i [2025-03-04 15:09:52,668 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aa234a3d8/0fc8737c08174ec1ae04ce0536f91d0c/FLAGc515ece02 [2025-03-04 15:09:52,948 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aa234a3d8/0fc8737c08174ec1ae04ce0536f91d0c [2025-03-04 15:09:52,950 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2025-03-04 15:09:52,952 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2025-03-04 15:09:52,953 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2025-03-04 15:09:52,953 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2025-03-04 15:09:52,956 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2025-03-04 15:09:52,957 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.03 03:09:52" (1/1) ... [2025-03-04 15:09:52,958 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27a2aade and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:52, skipping insertion in model container [2025-03-04 15:09:52,958 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.03 03:09:52" (1/1) ... [2025-03-04 15:09:52,979 INFO L175 MainTranslator]: Built tables and reachable declarations [2025-03-04 15:09:53,235 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-03-04 15:09:53,247 INFO L200 MainTranslator]: Completed pre-run [2025-03-04 15:09:53,273 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-03-04 15:09:53,295 INFO L204 MainTranslator]: Completed translation [2025-03-04 15:09:53,296 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53 WrapperNode [2025-03-04 15:09:53,296 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2025-03-04 15:09:53,297 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2025-03-04 15:09:53,297 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2025-03-04 15:09:53,297 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2025-03-04 15:09:53,301 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (1/1) ... [2025-03-04 15:09:53,308 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (1/1) ... [2025-03-04 15:09:53,322 INFO L138 Inliner]: procedures = 164, calls = 22, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 88 [2025-03-04 15:09:53,322 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2025-03-04 15:09:53,322 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2025-03-04 15:09:53,322 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2025-03-04 15:09:53,322 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2025-03-04 15:09:53,327 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (1/1) ... [2025-03-04 15:09:53,327 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (1/1) ... [2025-03-04 15:09:53,329 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (1/1) ... [2025-03-04 15:09:53,335 INFO L175 MemorySlicer]: Split 7 memory accesses to 2 slices as follows [2, 5]. 71 percent of accesses are in the largest equivalence class. The 7 initializations are split as follows [2, 5]. The 0 writes are split as follows [0, 0]. [2025-03-04 15:09:53,336 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (1/1) ... [2025-03-04 15:09:53,336 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (1/1) ... [2025-03-04 15:09:53,343 INFO L184 PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (1/1) ... [2025-03-04 15:09:53,344 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (1/1) ... [2025-03-04 15:09:53,344 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (1/1) ... [2025-03-04 15:09:53,345 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (1/1) ... [2025-03-04 15:09:53,346 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2025-03-04 15:09:53,347 INFO L112 PluginConnector]: ------------------------IcfgBuilder---------------------------- [2025-03-04 15:09:53,347 INFO L270 PluginConnector]: Initializing IcfgBuilder... [2025-03-04 15:09:53,347 INFO L274 PluginConnector]: IcfgBuilder initialized [2025-03-04 15:09:53,347 INFO L184 PluginConnector]: Executing the observer IcfgBuilderObserver from plugin IcfgBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (1/1) ... [2025-03-04 15:09:53,351 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-03-04 15:09:53,361 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-04 15:09:53,372 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2025-03-04 15:09:53,377 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2025-03-04 15:09:53,391 INFO L130 BoogieDeclarations]: Found specification of procedure thr2 [2025-03-04 15:09:53,392 INFO L138 BoogieDeclarations]: Found implementation of procedure thr2 [2025-03-04 15:09:53,392 INFO L130 BoogieDeclarations]: Found specification of procedure thr1 [2025-03-04 15:09:53,392 INFO L138 BoogieDeclarations]: Found implementation of procedure thr1 [2025-03-04 15:09:53,392 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2025-03-04 15:09:53,392 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2025-03-04 15:09:53,392 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2025-03-04 15:09:53,392 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2025-03-04 15:09:53,392 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexUnlock [2025-03-04 15:09:53,392 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2025-03-04 15:09:53,393 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2025-03-04 15:09:53,393 WARN L225 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement. [2025-03-04 15:09:53,482 INFO L256 CfgBuilder]: Building ICFG [2025-03-04 15:09:53,483 INFO L286 CfgBuilder]: Building CFG for each procedure with an implementation [2025-03-04 15:09:53,636 INFO L303 CfgBuilder]: Omitted future-live optimization because the input is a concurrent program. [2025-03-04 15:09:53,636 INFO L307 CfgBuilder]: Performing block encoding [2025-03-04 15:09:53,739 INFO L331 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2025-03-04 15:09:53,742 INFO L336 CfgBuilder]: Removed 0 assume(true) statements. [2025-03-04 15:09:53,742 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.icfgbuilder CFG 04.03 03:09:53 BoogieIcfgContainer [2025-03-04 15:09:53,742 INFO L131 PluginConnector]: ------------------------ END IcfgBuilder---------------------------- [2025-03-04 15:09:53,744 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2025-03-04 15:09:53,744 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2025-03-04 15:09:53,750 INFO L274 PluginConnector]: TraceAbstraction initialized [2025-03-04 15:09:53,750 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.03 03:09:52" (1/3) ... [2025-03-04 15:09:53,751 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a539811 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.03 03:09:53, skipping insertion in model container [2025-03-04 15:09:53,751 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.03 03:09:53" (2/3) ... [2025-03-04 15:09:53,751 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a539811 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.03 03:09:53, skipping insertion in model container [2025-03-04 15:09:53,751 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.icfgbuilder CFG 04.03 03:09:53" (3/3) ... [2025-03-04 15:09:53,752 INFO L128 eAbstractionObserver]: Analyzing ICFG 35_double_lock_p3_vs.i [2025-03-04 15:09:53,763 INFO L216 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2025-03-04 15:09:53,764 INFO L151 ceAbstractionStarter]: Applying trace abstraction to ICFG 35_double_lock_p3_vs.i that has 3 procedures, 41 locations, 1 initial locations, 2 loop locations, and 8 error locations. [2025-03-04 15:09:53,764 INFO L491 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2025-03-04 15:09:53,815 INFO L143 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2025-03-04 15:09:53,840 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 47 places, 43 transitions, 94 flow [2025-03-04 15:09:53,866 INFO L124 PetriNetUnfolderBase]: 2/44 cut-off events. [2025-03-04 15:09:53,870 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2025-03-04 15:09:53,874 INFO L83 FinitePrefix]: Finished finitePrefix Result has 51 conditions, 44 events. 2/44 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 53 event pairs, 0 based on Foata normal form. 0/32 useless extension candidates. Maximal degree in co-relation 44. Up to 2 conditions per place. [2025-03-04 15:09:53,874 INFO L82 GeneralOperation]: Start removeDead. Operand has 47 places, 43 transitions, 94 flow [2025-03-04 15:09:53,876 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 46 places, 42 transitions, 91 flow [2025-03-04 15:09:53,882 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2025-03-04 15:09:53,897 INFO L333 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, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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;@13025ad1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2025-03-04 15:09:53,897 INFO L334 AbstractCegarLoop]: Starting to check reachability of 18 error locations. [2025-03-04 15:09:53,905 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2025-03-04 15:09:53,906 INFO L124 PetriNetUnfolderBase]: 1/18 cut-off events. [2025-03-04 15:09:53,906 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2025-03-04 15:09:53,906 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-04 15:09:53,906 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2025-03-04 15:09:53,907 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [thr2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW, thr2Err6ASSERT_VIOLATIONINTEGER_OVERFLOW, thr2Err5ASSERT_VIOLATIONINTEGER_OVERFLOW (and 15 more)] === [2025-03-04 15:09:53,911 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-04 15:09:53,912 INFO L85 PathProgramCache]: Analyzing trace with hash -1100869463, now seen corresponding path program 1 times [2025-03-04 15:09:53,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-04 15:09:53,918 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202007600] [2025-03-04 15:09:53,918 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-04 15:09:53,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-04 15:09:53,981 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 8 statements into 1 equivalence classes. [2025-03-04 15:09:54,000 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 8 of 8 statements. [2025-03-04 15:09:54,001 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-04 15:09:54,001 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is sat [2025-03-04 15:09:54,002 INFO L348 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2025-03-04 15:09:54,007 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 8 statements into 1 equivalence classes. [2025-03-04 15:09:54,020 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 8 of 8 statements. [2025-03-04 15:09:54,021 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-04 15:09:54,021 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is sat [2025-03-04 15:09:54,036 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2025-03-04 15:09:54,037 INFO L340 BasicCegarLoop]: Counterexample is feasible [2025-03-04 15:09:54,038 INFO L782 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (17 of 18 remaining) [2025-03-04 15:09:54,039 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW (16 of 18 remaining) [2025-03-04 15:09:54,040 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err6ASSERT_VIOLATIONINTEGER_OVERFLOW (15 of 18 remaining) [2025-03-04 15:09:54,040 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err5ASSERT_VIOLATIONINTEGER_OVERFLOW (14 of 18 remaining) [2025-03-04 15:09:54,040 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err4ASSERT_VIOLATIONINTEGER_OVERFLOW (13 of 18 remaining) [2025-03-04 15:09:54,041 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err3ASSERT_VIOLATIONINTEGER_OVERFLOW (12 of 18 remaining) [2025-03-04 15:09:54,041 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err2ASSERT_VIOLATIONINTEGER_OVERFLOW (11 of 18 remaining) [2025-03-04 15:09:54,041 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (10 of 18 remaining) [2025-03-04 15:09:54,041 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err0ASSERT_VIOLATIONINTEGER_OVERFLOW (9 of 18 remaining) [2025-03-04 15:09:54,042 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (8 of 18 remaining) [2025-03-04 15:09:54,042 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW (7 of 18 remaining) [2025-03-04 15:09:54,042 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err6ASSERT_VIOLATIONINTEGER_OVERFLOW (6 of 18 remaining) [2025-03-04 15:09:54,042 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err5ASSERT_VIOLATIONINTEGER_OVERFLOW (5 of 18 remaining) [2025-03-04 15:09:54,042 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err4ASSERT_VIOLATIONINTEGER_OVERFLOW (4 of 18 remaining) [2025-03-04 15:09:54,042 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err3ASSERT_VIOLATIONINTEGER_OVERFLOW (3 of 18 remaining) [2025-03-04 15:09:54,042 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err2ASSERT_VIOLATIONINTEGER_OVERFLOW (2 of 18 remaining) [2025-03-04 15:09:54,042 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (1 of 18 remaining) [2025-03-04 15:09:54,043 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err0ASSERT_VIOLATIONINTEGER_OVERFLOW (0 of 18 remaining) [2025-03-04 15:09:54,044 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2025-03-04 15:09:54,044 INFO L422 BasicCegarLoop]: Path program histogram: [1] [2025-03-04 15:09:54,046 WARN L246 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2025-03-04 15:09:54,049 INFO L491 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2025-03-04 15:09:54,104 INFO L143 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2025-03-04 15:09:54,106 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 85 places, 79 transitions, 178 flow [2025-03-04 15:09:54,128 INFO L124 PetriNetUnfolderBase]: 3/76 cut-off events. [2025-03-04 15:09:54,128 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2025-03-04 15:09:54,130 INFO L83 FinitePrefix]: Finished finitePrefix Result has 88 conditions, 76 events. 3/76 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 163 event pairs, 0 based on Foata normal form. 0/54 useless extension candidates. Maximal degree in co-relation 83. Up to 3 conditions per place. [2025-03-04 15:09:54,130 INFO L82 GeneralOperation]: Start removeDead. Operand has 85 places, 79 transitions, 178 flow [2025-03-04 15:09:54,131 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 76 places, 71 transitions, 155 flow [2025-03-04 15:09:54,132 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2025-03-04 15:09:54,132 INFO L333 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, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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;@13025ad1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2025-03-04 15:09:54,132 INFO L334 AbstractCegarLoop]: Starting to check reachability of 26 error locations. [2025-03-04 15:09:54,142 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2025-03-04 15:09:54,142 INFO L124 PetriNetUnfolderBase]: 1/25 cut-off events. [2025-03-04 15:09:54,142 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2025-03-04 15:09:54,143 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-04 15:09:54,143 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-04 15:09:54,143 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting thr2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW === [thr2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW, thr2Err6ASSERT_VIOLATIONINTEGER_OVERFLOW, thr2Err5ASSERT_VIOLATIONINTEGER_OVERFLOW (and 23 more)] === [2025-03-04 15:09:54,143 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-04 15:09:54,143 INFO L85 PathProgramCache]: Analyzing trace with hash 1105082635, now seen corresponding path program 1 times [2025-03-04 15:09:54,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-04 15:09:54,143 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701276991] [2025-03-04 15:09:54,143 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-04 15:09:54,143 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-04 15:09:54,156 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 10 statements into 1 equivalence classes. [2025-03-04 15:09:54,168 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 10 of 10 statements. [2025-03-04 15:09:54,170 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-04 15:09:54,170 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-04 15:09:54,297 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-04 15:09:54,297 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-04 15:09:54,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701276991] [2025-03-04 15:09:54,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1701276991] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-04 15:09:54,298 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-04 15:09:54,298 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2025-03-04 15:09:54,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920064942] [2025-03-04 15:09:54,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-04 15:09:54,304 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-03-04 15:09:54,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-04 15:09:54,323 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-03-04 15:09:54,323 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2025-03-04 15:09:54,330 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 30 out of 79 [2025-03-04 15:09:54,333 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 71 transitions, 155 flow. Second operand has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-04 15:09:54,333 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-04 15:09:54,333 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 30 of 79 [2025-03-04 15:09:54,335 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-04 15:09:55,609 INFO L124 PetriNetUnfolderBase]: 9181/15982 cut-off events. [2025-03-04 15:09:55,610 INFO L125 PetriNetUnfolderBase]: For 214/214 co-relation queries the response was YES. [2025-03-04 15:09:55,649 INFO L83 FinitePrefix]: Finished finitePrefix Result has 28946 conditions, 15982 events. 9181/15982 cut-off events. For 214/214 co-relation queries the response was YES. Maximal size of possible extension queue 480. Compared 116148 event pairs, 2182 based on Foata normal form. 216/14696 useless extension candidates. Maximal degree in co-relation 28935. Up to 10173 conditions per place. [2025-03-04 15:09:55,724 INFO L140 encePairwiseOnDemand]: 71/79 looper letters, 84 selfloop transitions, 6 changer transitions 0/117 dead transitions. [2025-03-04 15:09:55,724 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 117 transitions, 437 flow [2025-03-04 15:09:55,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-04 15:09:55,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2025-03-04 15:09:55,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 252 transitions. [2025-03-04 15:09:55,735 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6379746835443038 [2025-03-04 15:09:55,736 INFO L175 Difference]: Start difference. First operand has 76 places, 71 transitions, 155 flow. Second operand 5 states and 252 transitions. [2025-03-04 15:09:55,737 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 117 transitions, 437 flow [2025-03-04 15:09:55,742 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 77 places, 117 transitions, 436 flow, removed 0 selfloop flow, removed 1 redundant places. [2025-03-04 15:09:55,745 INFO L231 Difference]: Finished difference. Result has 80 places, 74 transitions, 194 flow [2025-03-04 15:09:55,747 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=79, PETRI_DIFFERENCE_MINUEND_FLOW=150, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=69, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=65, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=194, PETRI_PLACES=80, PETRI_TRANSITIONS=74} [2025-03-04 15:09:55,750 INFO L279 CegarLoopForPetriNet]: 76 programPoint places, 4 predicate places. [2025-03-04 15:09:55,750 INFO L471 AbstractCegarLoop]: Abstraction has has 80 places, 74 transitions, 194 flow [2025-03-04 15:09:55,750 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-04 15:09:55,750 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-04 15:09:55,751 INFO L206 CegarLoopForPetriNet]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2025-03-04 15:09:55,751 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2025-03-04 15:09:55,751 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [thr2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW, thr2Err6ASSERT_VIOLATIONINTEGER_OVERFLOW, thr2Err5ASSERT_VIOLATIONINTEGER_OVERFLOW (and 23 more)] === [2025-03-04 15:09:55,751 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-04 15:09:55,751 INFO L85 PathProgramCache]: Analyzing trace with hash -2049714181, now seen corresponding path program 1 times [2025-03-04 15:09:55,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-04 15:09:55,751 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168938455] [2025-03-04 15:09:55,751 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-04 15:09:55,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-04 15:09:55,762 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 11 statements into 1 equivalence classes. [2025-03-04 15:09:55,770 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 11 of 11 statements. [2025-03-04 15:09:55,770 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-04 15:09:55,770 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is sat [2025-03-04 15:09:55,770 INFO L348 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2025-03-04 15:09:55,773 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 11 statements into 1 equivalence classes. [2025-03-04 15:09:55,785 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 11 of 11 statements. [2025-03-04 15:09:55,786 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-04 15:09:55,786 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is sat [2025-03-04 15:09:55,790 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2025-03-04 15:09:55,790 INFO L340 BasicCegarLoop]: Counterexample is feasible [2025-03-04 15:09:55,790 INFO L782 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (25 of 26 remaining) [2025-03-04 15:09:55,790 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW (24 of 26 remaining) [2025-03-04 15:09:55,790 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err6ASSERT_VIOLATIONINTEGER_OVERFLOW (23 of 26 remaining) [2025-03-04 15:09:55,790 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err5ASSERT_VIOLATIONINTEGER_OVERFLOW (22 of 26 remaining) [2025-03-04 15:09:55,790 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err4ASSERT_VIOLATIONINTEGER_OVERFLOW (21 of 26 remaining) [2025-03-04 15:09:55,790 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err3ASSERT_VIOLATIONINTEGER_OVERFLOW (20 of 26 remaining) [2025-03-04 15:09:55,790 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err2ASSERT_VIOLATIONINTEGER_OVERFLOW (19 of 26 remaining) [2025-03-04 15:09:55,790 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (18 of 26 remaining) [2025-03-04 15:09:55,790 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err0ASSERT_VIOLATIONINTEGER_OVERFLOW (17 of 26 remaining) [2025-03-04 15:09:55,792 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (16 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW (15 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err6ASSERT_VIOLATIONINTEGER_OVERFLOW (14 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err5ASSERT_VIOLATIONINTEGER_OVERFLOW (13 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err4ASSERT_VIOLATIONINTEGER_OVERFLOW (12 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err3ASSERT_VIOLATIONINTEGER_OVERFLOW (11 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err2ASSERT_VIOLATIONINTEGER_OVERFLOW (10 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (9 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err0ASSERT_VIOLATIONINTEGER_OVERFLOW (8 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW (7 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err6ASSERT_VIOLATIONINTEGER_OVERFLOW (6 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err5ASSERT_VIOLATIONINTEGER_OVERFLOW (5 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err4ASSERT_VIOLATIONINTEGER_OVERFLOW (4 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err3ASSERT_VIOLATIONINTEGER_OVERFLOW (3 of 26 remaining) [2025-03-04 15:09:55,793 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err2ASSERT_VIOLATIONINTEGER_OVERFLOW (2 of 26 remaining) [2025-03-04 15:09:55,794 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (1 of 26 remaining) [2025-03-04 15:09:55,794 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err0ASSERT_VIOLATIONINTEGER_OVERFLOW (0 of 26 remaining) [2025-03-04 15:09:55,794 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2025-03-04 15:09:55,794 INFO L422 BasicCegarLoop]: Path program histogram: [1, 1] [2025-03-04 15:09:55,794 WARN L246 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2025-03-04 15:09:55,795 INFO L491 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2025-03-04 15:09:55,835 INFO L143 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2025-03-04 15:09:55,837 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 123 places, 115 transitions, 266 flow [2025-03-04 15:09:55,845 INFO L124 PetriNetUnfolderBase]: 4/108 cut-off events. [2025-03-04 15:09:55,845 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2025-03-04 15:09:55,846 INFO L83 FinitePrefix]: Finished finitePrefix Result has 126 conditions, 108 events. 4/108 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 314 event pairs, 0 based on Foata normal form. 0/76 useless extension candidates. Maximal degree in co-relation 119. Up to 4 conditions per place. [2025-03-04 15:09:55,846 INFO L82 GeneralOperation]: Start removeDead. Operand has 123 places, 115 transitions, 266 flow [2025-03-04 15:09:55,847 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 106 places, 100 transitions, 221 flow [2025-03-04 15:09:55,847 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2025-03-04 15:09:55,848 INFO L333 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, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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;@13025ad1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2025-03-04 15:09:55,848 INFO L334 AbstractCegarLoop]: Starting to check reachability of 34 error locations. [2025-03-04 15:09:55,852 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2025-03-04 15:09:55,853 INFO L124 PetriNetUnfolderBase]: 1/29 cut-off events. [2025-03-04 15:09:55,853 INFO L125 PetriNetUnfolderBase]: For 4/4 co-relation queries the response was YES. [2025-03-04 15:09:55,853 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-04 15:09:55,853 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-04 15:09:55,853 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting thr2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW === [thr2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW, thr2Err6ASSERT_VIOLATIONINTEGER_OVERFLOW, thr2Err5ASSERT_VIOLATIONINTEGER_OVERFLOW (and 31 more)] === [2025-03-04 15:09:55,853 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-04 15:09:55,853 INFO L85 PathProgramCache]: Analyzing trace with hash 1337838096, now seen corresponding path program 1 times [2025-03-04 15:09:55,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-04 15:09:55,853 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117131407] [2025-03-04 15:09:55,853 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-04 15:09:55,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-04 15:09:55,864 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 10 statements into 1 equivalence classes. [2025-03-04 15:09:55,871 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 10 of 10 statements. [2025-03-04 15:09:55,871 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-04 15:09:55,871 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-04 15:09:55,924 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-04 15:09:55,924 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-04 15:09:55,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117131407] [2025-03-04 15:09:55,924 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117131407] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-04 15:09:55,925 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-04 15:09:55,925 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2025-03-04 15:09:55,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815760394] [2025-03-04 15:09:55,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-04 15:09:55,925 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-03-04 15:09:55,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-04 15:09:55,926 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-03-04 15:09:55,926 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2025-03-04 15:09:55,931 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 45 out of 115 [2025-03-04 15:09:55,932 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 106 places, 100 transitions, 221 flow. Second operand has 4 states, 4 states have (on average 47.5) internal successors, (190), 4 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-04 15:09:55,932 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-04 15:09:55,932 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 45 of 115 [2025-03-04 15:09:55,932 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-04 15:10:09,379 INFO L124 PetriNetUnfolderBase]: 193529/301731 cut-off events. [2025-03-04 15:10:09,380 INFO L125 PetriNetUnfolderBase]: For 7136/7136 co-relation queries the response was YES. [2025-03-04 15:10:10,040 INFO L83 FinitePrefix]: Finished finitePrefix Result has 553824 conditions, 301731 events. 193529/301731 cut-off events. For 7136/7136 co-relation queries the response was YES. Maximal size of possible extension queue 6689. Compared 2733224 event pairs, 47152 based on Foata normal form. 3204/275732 useless extension candidates. Maximal degree in co-relation 553812. Up to 218309 conditions per place. [2025-03-04 15:10:11,277 INFO L140 encePairwiseOnDemand]: 106/115 looper letters, 136 selfloop transitions, 8 changer transitions 0/184 dead transitions. [2025-03-04 15:10:11,277 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 108 places, 184 transitions, 708 flow [2025-03-04 15:10:11,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-04 15:10:11,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2025-03-04 15:10:11,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 381 transitions. [2025-03-04 15:10:11,279 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.662608695652174 [2025-03-04 15:10:11,279 INFO L175 Difference]: Start difference. First operand has 106 places, 100 transitions, 221 flow. Second operand 5 states and 381 transitions. [2025-03-04 15:10:11,279 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 108 places, 184 transitions, 708 flow [2025-03-04 15:10:11,285 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 107 places, 184 transitions, 699 flow, removed 4 selfloop flow, removed 1 redundant places. [2025-03-04 15:10:11,288 INFO L231 Difference]: Finished difference. Result has 110 places, 105 transitions, 275 flow [2025-03-04 15:10:11,288 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=115, PETRI_DIFFERENCE_MINUEND_FLOW=214, PETRI_DIFFERENCE_MINUEND_PLACES=103, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=98, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=93, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=275, PETRI_PLACES=110, PETRI_TRANSITIONS=105} [2025-03-04 15:10:11,288 INFO L279 CegarLoopForPetriNet]: 106 programPoint places, 4 predicate places. [2025-03-04 15:10:11,288 INFO L471 AbstractCegarLoop]: Abstraction has has 110 places, 105 transitions, 275 flow [2025-03-04 15:10:11,289 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 47.5) internal successors, (190), 4 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-04 15:10:11,289 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-04 15:10:11,289 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-04 15:10:11,289 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2025-03-04 15:10:11,289 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting thr2Err5ASSERT_VIOLATIONINTEGER_OVERFLOW === [thr2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW, thr2Err6ASSERT_VIOLATIONINTEGER_OVERFLOW, thr2Err5ASSERT_VIOLATIONINTEGER_OVERFLOW (and 31 more)] === [2025-03-04 15:10:11,289 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-04 15:10:11,289 INFO L85 PathProgramCache]: Analyzing trace with hash 1467201233, now seen corresponding path program 1 times [2025-03-04 15:10:11,289 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-04 15:10:11,289 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834694722] [2025-03-04 15:10:11,289 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-04 15:10:11,290 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-04 15:10:11,299 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 12 statements into 1 equivalence classes. [2025-03-04 15:10:11,301 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 12 of 12 statements. [2025-03-04 15:10:11,301 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-04 15:10:11,301 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-04 15:10:11,356 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-04 15:10:11,356 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-04 15:10:11,356 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834694722] [2025-03-04 15:10:11,357 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834694722] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-04 15:10:11,357 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-04 15:10:11,357 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2025-03-04 15:10:11,357 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337109] [2025-03-04 15:10:11,357 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-04 15:10:11,358 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-04 15:10:11,359 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-04 15:10:11,359 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-04 15:10:11,359 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2025-03-04 15:10:11,371 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 43 out of 115 [2025-03-04 15:10:11,371 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 110 places, 105 transitions, 275 flow. Second operand has 5 states, 5 states have (on average 45.2) internal successors, (226), 5 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-04 15:10:11,371 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-04 15:10:11,371 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 43 of 115 [2025-03-04 15:10:11,371 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand