./Ultimate.py --spec ../sv-benchmarks/c/properties/no-data-race.prp --file ../sv-benchmarks/c/pthread-wmm/mix044_power.oepc_pso.oepc_rmo.oepc.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for data races Using default analysis Version 803cd42f Calling Ultimate with: /root/.sdkman/candidates/java/current/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_1.5.800.v20200727-1323.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-wmm/mix044_power.oepc_pso.oepc_rmo.oepc.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DataRace-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 ! data-race) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 40f0a1ff0b59c9897722e1cc89a9065b61569e5c28581990c7adb84261d57e0b --- Real Ultimate output --- This is Ultimate 0.2.5-tmp.dk.eval-assert-order-craig-803cd42-m [2024-11-22 17:38:14,666 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-22 17:38:14,744 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DataRace-32bit-Automizer_Default.epf [2024-11-22 17:38:14,749 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-22 17:38:14,750 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-22 17:38:14,781 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-22 17:38:14,782 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-22 17:38:14,782 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-22 17:38:14,783 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-22 17:38:14,785 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-22 17:38:14,785 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-11-22 17:38:14,785 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-11-22 17:38:14,786 INFO L153 SettingsManager]: * Use SBE=true [2024-11-22 17:38:14,786 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-22 17:38:14,786 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-22 17:38:14,787 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-22 17:38:14,787 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-22 17:38:14,787 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-22 17:38:14,787 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-22 17:38:14,787 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-22 17:38:14,788 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-22 17:38:14,792 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-22 17:38:14,792 INFO L153 SettingsManager]: * Check absence of data races in concurrent programs=true [2024-11-22 17:38:14,793 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-22 17:38:14,793 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2024-11-22 17:38:14,793 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-22 17:38:14,793 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-22 17:38:14,793 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-22 17:38:14,794 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-22 17:38:14,794 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-11-22 17:38:14,794 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-22 17:38:14,794 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-22 17:38:14,794 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-22 17:38:14,795 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-22 17:38:14,795 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-22 17:38:14,795 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-11-22 17:38:14,795 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-22 17:38:14,795 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-22 17:38:14,796 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-11-22 17:38:14,796 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-11-22 17:38:14,796 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-22 17:38:14,797 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! data-race) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 40f0a1ff0b59c9897722e1cc89a9065b61569e5c28581990c7adb84261d57e0b [2024-11-22 17:38:15,044 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-22 17:38:15,072 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-22 17:38:15,075 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-22 17:38:15,076 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-22 17:38:15,077 INFO L274 PluginConnector]: CDTParser initialized [2024-11-22 17:38:15,078 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/pthread-wmm/mix044_power.oepc_pso.oepc_rmo.oepc.i [2024-11-22 17:38:16,531 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-22 17:38:16,741 INFO L384 CDTParser]: Found 1 translation units. [2024-11-22 17:38:16,742 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-wmm/mix044_power.oepc_pso.oepc_rmo.oepc.i [2024-11-22 17:38:16,763 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59c3ac23f/b5a983425a264c3d9417aacee904befb/FLAG69fcab264 [2024-11-22 17:38:16,776 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59c3ac23f/b5a983425a264c3d9417aacee904befb [2024-11-22 17:38:16,778 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-22 17:38:16,779 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-22 17:38:16,782 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-22 17:38:16,782 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-22 17:38:16,787 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-22 17:38:16,787 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 05:38:16" (1/1) ... [2024-11-22 17:38:16,788 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@416a7630 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:16, skipping insertion in model container [2024-11-22 17:38:16,789 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 05:38:16" (1/1) ... [2024-11-22 17:38:16,844 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-22 17:38:17,336 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-22 17:38:17,351 INFO L200 MainTranslator]: Completed pre-run [2024-11-22 17:38:17,431 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-22 17:38:17,472 INFO L204 MainTranslator]: Completed translation [2024-11-22 17:38:17,473 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17 WrapperNode [2024-11-22 17:38:17,473 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-22 17:38:17,474 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-22 17:38:17,474 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-22 17:38:17,475 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-22 17:38:17,481 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17" (1/1) ... [2024-11-22 17:38:17,504 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17" (1/1) ... [2024-11-22 17:38:17,540 INFO L138 Inliner]: procedures = 176, calls = 56, calls flagged for inlining = 6, calls inlined = 7, statements flattened = 504 [2024-11-22 17:38:17,541 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-22 17:38:17,542 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-22 17:38:17,542 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-22 17:38:17,542 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-22 17:38:17,554 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17" (1/1) ... [2024-11-22 17:38:17,557 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17" (1/1) ... [2024-11-22 17:38:17,565 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17" (1/1) ... [2024-11-22 17:38:17,565 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17" (1/1) ... [2024-11-22 17:38:17,585 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17" (1/1) ... [2024-11-22 17:38:17,593 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17" (1/1) ... [2024-11-22 17:38:17,597 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17" (1/1) ... [2024-11-22 17:38:17,605 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17" (1/1) ... [2024-11-22 17:38:17,623 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-22 17:38:17,624 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-22 17:38:17,624 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-22 17:38:17,624 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-22 17:38:17,625 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17" (1/1) ... [2024-11-22 17:38:17,637 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-22 17:38:17,648 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-22 17:38:17,666 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) [2024-11-22 17:38:17,670 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 [2024-11-22 17:38:17,721 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2024-11-22 17:38:17,721 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-22 17:38:17,722 INFO L130 BoogieDeclarations]: Found specification of procedure P0 [2024-11-22 17:38:17,722 INFO L138 BoogieDeclarations]: Found implementation of procedure P0 [2024-11-22 17:38:17,722 INFO L130 BoogieDeclarations]: Found specification of procedure P1 [2024-11-22 17:38:17,722 INFO L138 BoogieDeclarations]: Found implementation of procedure P1 [2024-11-22 17:38:17,722 INFO L130 BoogieDeclarations]: Found specification of procedure P2 [2024-11-22 17:38:17,723 INFO L138 BoogieDeclarations]: Found implementation of procedure P2 [2024-11-22 17:38:17,723 INFO L130 BoogieDeclarations]: Found specification of procedure P3 [2024-11-22 17:38:17,724 INFO L138 BoogieDeclarations]: Found implementation of procedure P3 [2024-11-22 17:38:17,724 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-22 17:38:17,724 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2024-11-22 17:38:17,724 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-22 17:38:17,724 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-22 17:38:17,726 WARN L207 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement. [2024-11-22 17:38:17,942 INFO L238 CfgBuilder]: Building ICFG [2024-11-22 17:38:17,944 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-22 17:38:19,380 INFO L283 CfgBuilder]: Omitted future-live optimization because the input is a concurrent program. [2024-11-22 17:38:19,381 INFO L287 CfgBuilder]: Performing block encoding [2024-11-22 17:38:24,410 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-22 17:38:24,411 INFO L316 CfgBuilder]: Removed 0 assume(true) statements. [2024-11-22 17:38:24,411 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 05:38:24 BoogieIcfgContainer [2024-11-22 17:38:24,411 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-22 17:38:24,413 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-22 17:38:24,413 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-22 17:38:24,416 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-22 17:38:24,416 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 05:38:16" (1/3) ... [2024-11-22 17:38:24,417 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72284eb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 05:38:24, skipping insertion in model container [2024-11-22 17:38:24,417 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:38:17" (2/3) ... [2024-11-22 17:38:24,418 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72284eb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 05:38:24, skipping insertion in model container [2024-11-22 17:38:24,418 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 05:38:24" (3/3) ... [2024-11-22 17:38:24,419 INFO L112 eAbstractionObserver]: Analyzing ICFG mix044_power.oepc_pso.oepc_rmo.oepc.i [2024-11-22 17:38:24,435 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-22 17:38:24,436 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 283 error locations. [2024-11-22 17:38:24,436 INFO L489 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2024-11-22 17:38:24,749 INFO L143 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2024-11-22 17:38:24,797 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 426 places, 416 transitions, 848 flow [2024-11-22 17:38:25,018 INFO L124 PetriNetUnfolderBase]: 3/412 cut-off events. [2024-11-22 17:38:25,022 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-11-22 17:38:25,040 INFO L83 FinitePrefix]: Finished finitePrefix Result has 425 conditions, 412 events. 3/412 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 99. Compared 2275 event pairs, 0 based on Foata normal form. 0/126 useless extension candidates. Maximal degree in co-relation 374. Up to 2 conditions per place. [2024-11-22 17:38:25,040 INFO L82 GeneralOperation]: Start removeDead. Operand has 426 places, 416 transitions, 848 flow [2024-11-22 17:38:25,070 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 422 places, 412 transitions, 836 flow [2024-11-22 17:38:25,082 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-22 17:38:25,091 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;@1ec78dc0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-22 17:38:25,091 INFO L334 AbstractCegarLoop]: Starting to check reachability of 532 error locations. [2024-11-22 17:38:25,101 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2024-11-22 17:38:25,102 INFO L124 PetriNetUnfolderBase]: 0/47 cut-off events. [2024-11-22 17:38:25,102 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-11-22 17:38:25,103 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-22 17:38:25,103 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-22 17:38:25,104 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting P0Err0ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 528 more)] === [2024-11-22 17:38:25,109 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-22 17:38:25,109 INFO L85 PathProgramCache]: Analyzing trace with hash 296883094, now seen corresponding path program 1 times [2024-11-22 17:38:25,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-22 17:38:25,119 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [901818688] [2024-11-22 17:38:25,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-22 17:38:25,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-22 17:38:25,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-22 17:38:25,389 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-22 17:38:25,389 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-22 17:38:25,390 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [901818688] [2024-11-22 17:38:25,390 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [901818688] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-22 17:38:25,391 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-22 17:38:25,391 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-11-22 17:38:25,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191657894] [2024-11-22 17:38:25,397 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-22 17:38:25,405 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-11-22 17:38:25,410 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-22 17:38:25,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-11-22 17:38:25,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-22 17:38:25,436 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 106 out of 416 [2024-11-22 17:38:25,439 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 422 places, 412 transitions, 836 flow. Second operand has 2 states, 2 states have (on average 107.0) internal successors, (214), 2 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-22 17:38:25,439 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-22 17:38:25,439 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 106 of 416 [2024-11-22 17:38:25,440 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-11-22 17:38:37,489 INFO L124 PetriNetUnfolderBase]: 10870/29690 cut-off events. [2024-11-22 17:38:37,490 INFO L125 PetriNetUnfolderBase]: For 156/156 co-relation queries the response was YES. [2024-11-22 17:38:37,621 INFO L83 FinitePrefix]: Finished finitePrefix Result has 44533 conditions, 29690 events. 10870/29690 cut-off events. For 156/156 co-relation queries the response was YES. Maximal size of possible extension queue 1206. Compared 369999 event pairs, 10870 based on Foata normal form. 2568/30313 useless extension candidates. Maximal degree in co-relation 44480. Up to 14526 conditions per place. [2024-11-22 17:38:37,826 INFO L140 encePairwiseOnDemand]: 132/416 looper letters, 25 selfloop transitions, 0 changer transitions 0/126 dead transitions. [2024-11-22 17:38:37,826 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 140 places, 126 transitions, 314 flow [2024-11-22 17:38:37,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-11-22 17:38:37,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2024-11-22 17:38:37,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 521 transitions. [2024-11-22 17:38:37,847 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.6262019230769231 [2024-11-22 17:38:37,850 INFO L175 Difference]: Start difference. First operand has 422 places, 412 transitions, 836 flow. Second operand 2 states and 521 transitions. [2024-11-22 17:38:37,851 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 140 places, 126 transitions, 314 flow [2024-11-22 17:38:37,854 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 136 places, 126 transitions, 310 flow, removed 0 selfloop flow, removed 4 redundant places. [2024-11-22 17:38:37,857 INFO L231 Difference]: Finished difference. Result has 136 places, 126 transitions, 260 flow [2024-11-22 17:38:37,859 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=416, PETRI_DIFFERENCE_MINUEND_FLOW=260, PETRI_DIFFERENCE_MINUEND_PLACES=135, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=126, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=126, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=260, PETRI_PLACES=136, PETRI_TRANSITIONS=126} [2024-11-22 17:38:37,864 INFO L277 CegarLoopForPetriNet]: 422 programPoint places, -286 predicate places. [2024-11-22 17:38:37,865 INFO L471 AbstractCegarLoop]: Abstraction has has 136 places, 126 transitions, 260 flow [2024-11-22 17:38:37,865 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 107.0) internal successors, (214), 2 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-22 17:38:37,865 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-22 17:38:37,866 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-22 17:38:37,866 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-22 17:38:37,866 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 528 more)] === [2024-11-22 17:38:37,867 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-22 17:38:37,867 INFO L85 PathProgramCache]: Analyzing trace with hash -592393018, now seen corresponding path program 1 times [2024-11-22 17:38:37,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-22 17:38:37,868 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19681246] [2024-11-22 17:38:37,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-22 17:38:37,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-22 17:38:37,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-22 17:38:38,045 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-22 17:38:38,045 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-22 17:38:38,046 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19681246] [2024-11-22 17:38:38,047 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19681246] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-22 17:38:38,047 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-22 17:38:38,047 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-22 17:38:38,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120993254] [2024-11-22 17:38:38,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-22 17:38:38,049 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-22 17:38:38,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-22 17:38:38,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-22 17:38:38,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-22 17:38:38,056 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 103 out of 416 [2024-11-22 17:38:38,057 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 136 places, 126 transitions, 260 flow. Second operand has 3 states, 3 states have (on average 105.33333333333333) internal successors, (316), 3 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-22 17:38:38,057 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-22 17:38:38,057 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 103 of 416 [2024-11-22 17:38:38,057 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-11-22 17:38:51,462 INFO L124 PetriNetUnfolderBase]: 16570/42943 cut-off events. [2024-11-22 17:38:51,462 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-11-22 17:38:51,590 INFO L83 FinitePrefix]: Finished finitePrefix Result has 65233 conditions, 42943 events. 16570/42943 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 1178. Compared 521551 event pairs, 5170 based on Foata normal form. 0/40265 useless extension candidates. Maximal degree in co-relation 65230. Up to 14900 conditions per place. [2024-11-22 17:38:51,748 INFO L140 encePairwiseOnDemand]: 414/416 looper letters, 44 selfloop transitions, 1 changer transitions 0/143 dead transitions. [2024-11-22 17:38:51,749 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 137 places, 143 transitions, 384 flow [2024-11-22 17:38:51,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-22 17:38:51,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-11-22 17:38:51,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 355 transitions. [2024-11-22 17:38:51,752 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.2844551282051282 [2024-11-22 17:38:51,752 INFO L175 Difference]: Start difference. First operand has 136 places, 126 transitions, 260 flow. Second operand 3 states and 355 transitions. [2024-11-22 17:38:51,752 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 137 places, 143 transitions, 384 flow [2024-11-22 17:38:51,753 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 137 places, 143 transitions, 384 flow, removed 0 selfloop flow, removed 0 redundant places. [2024-11-22 17:38:51,759 INFO L231 Difference]: Finished difference. Result has 137 places, 125 transitions, 260 flow [2024-11-22 17:38:51,760 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=416, PETRI_DIFFERENCE_MINUEND_FLOW=258, PETRI_DIFFERENCE_MINUEND_PLACES=135, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=125, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=124, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=260, PETRI_PLACES=137, PETRI_TRANSITIONS=125} [2024-11-22 17:38:51,762 INFO L277 CegarLoopForPetriNet]: 422 programPoint places, -285 predicate places. [2024-11-22 17:38:51,763 INFO L471 AbstractCegarLoop]: Abstraction has has 137 places, 125 transitions, 260 flow [2024-11-22 17:38:51,764 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 105.33333333333333) internal successors, (316), 3 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-22 17:38:51,764 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-22 17:38:51,764 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-22 17:38:51,765 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-22 17:38:51,767 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr37ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 528 more)] === [2024-11-22 17:38:51,769 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-22 17:38:51,770 INFO L85 PathProgramCache]: Analyzing trace with hash -19754247, now seen corresponding path program 1 times [2024-11-22 17:38:51,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-22 17:38:51,771 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583758662] [2024-11-22 17:38:51,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-22 17:38:51,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-22 17:38:51,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-22 17:38:51,944 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-22 17:38:51,945 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-22 17:38:51,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583758662] [2024-11-22 17:38:51,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583758662] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-22 17:38:51,946 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-22 17:38:51,946 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-22 17:38:51,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43322906] [2024-11-22 17:38:51,947 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-22 17:38:51,947 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-22 17:38:51,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-22 17:38:51,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-22 17:38:51,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-22 17:38:51,951 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 103 out of 416 [2024-11-22 17:38:51,952 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 137 places, 125 transitions, 260 flow. Second operand has 3 states, 3 states have (on average 106.0) internal successors, (318), 3 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-22 17:38:51,952 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-22 17:38:51,952 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 103 of 416 [2024-11-22 17:38:51,953 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand