./Ultimate.py --spec /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/properties/no-data-race.prp --file /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-wmm/mix051_tso.oepc.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for data races Using default analysis Version 84cfde4a Calling Ultimate with: /root/.sdkman/candidates/java/current/bin/java -Dosgi.configuration.area=/storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-wmm/mix051_tso.oepc.i -s /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/config/svcomp-DataRace-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate-clean/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 798582ee4a09ede0f5c496225fe921dfd53b0dfd5ded797f7106b8b9ef24e798 --- Real Ultimate output --- This is Ultimate 0.2.5-dev-84cfde4 [2024-10-11 16:57:02,987 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-10-11 16:57:03,047 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/config/svcomp-DataRace-32bit-Automizer_Default.epf [2024-10-11 16:57:03,053 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-10-11 16:57:03,055 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-10-11 16:57:03,069 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-10-11 16:57:03,069 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-10-11 16:57:03,069 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-10-11 16:57:03,070 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-10-11 16:57:03,070 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-10-11 16:57:03,071 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-10-11 16:57:03,071 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-10-11 16:57:03,071 INFO L153 SettingsManager]: * Use SBE=true [2024-10-11 16:57:03,071 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-10-11 16:57:03,072 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-10-11 16:57:03,072 INFO L153 SettingsManager]: * sizeof long=4 [2024-10-11 16:57:03,072 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-10-11 16:57:03,073 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-10-11 16:57:03,073 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-10-11 16:57:03,073 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-10-11 16:57:03,073 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-10-11 16:57:03,076 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-10-11 16:57:03,077 INFO L153 SettingsManager]: * Check absence of data races in concurrent programs=true [2024-10-11 16:57:03,077 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-10-11 16:57:03,077 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2024-10-11 16:57:03,077 INFO L153 SettingsManager]: * sizeof long double=12 [2024-10-11 16:57:03,077 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-10-11 16:57:03,078 INFO L153 SettingsManager]: * Use constant arrays=true [2024-10-11 16:57:03,078 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-10-11 16:57:03,078 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-10-11 16:57:03,078 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-10-11 16:57:03,078 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-11 16:57:03,079 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-10-11 16:57:03,079 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-10-11 16:57:03,079 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-10-11 16:57:03,079 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-10-11 16:57:03,079 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-10-11 16:57:03,080 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-10-11 16:57:03,080 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-10-11 16:57:03,083 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-10-11 16:57:03,083 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-10-11 16:57:03,084 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-clean/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! data-race) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 798582ee4a09ede0f5c496225fe921dfd53b0dfd5ded797f7106b8b9ef24e798 [2024-10-11 16:57:03,306 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-10-11 16:57:03,328 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-10-11 16:57:03,330 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-10-11 16:57:03,331 INFO L270 PluginConnector]: Initializing CDTParser... [2024-10-11 16:57:03,332 INFO L274 PluginConnector]: CDTParser initialized [2024-10-11 16:57:03,333 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-wmm/mix051_tso.oepc.i [2024-10-11 16:57:04,771 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-10-11 16:57:04,998 INFO L384 CDTParser]: Found 1 translation units. [2024-10-11 16:57:04,999 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-wmm/mix051_tso.oepc.i [2024-10-11 16:57:05,011 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/data/b87a90d79/4920f7264884480095833da285359f72/FLAG8fd8330e5 [2024-10-11 16:57:05,022 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/data/b87a90d79/4920f7264884480095833da285359f72 [2024-10-11 16:57:05,024 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-10-11 16:57:05,025 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-10-11 16:57:05,026 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-10-11 16:57:05,027 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-10-11 16:57:05,030 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-10-11 16:57:05,031 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,032 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f38220d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05, skipping insertion in model container [2024-10-11 16:57:05,032 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,066 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-10-11 16:57:05,338 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-11 16:57:05,356 INFO L200 MainTranslator]: Completed pre-run [2024-10-11 16:57:05,467 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-11 16:57:05,604 INFO L204 MainTranslator]: Completed translation [2024-10-11 16:57:05,604 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05 WrapperNode [2024-10-11 16:57:05,604 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-10-11 16:57:05,606 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-10-11 16:57:05,607 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-10-11 16:57:05,610 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-10-11 16:57:05,620 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,651 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,693 INFO L138 Inliner]: procedures = 176, calls = 52, calls flagged for inlining = 6, calls inlined = 7, statements flattened = 948 [2024-10-11 16:57:05,693 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-10-11 16:57:05,694 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-10-11 16:57:05,694 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-10-11 16:57:05,697 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-10-11 16:57:05,708 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,708 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,716 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,717 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,730 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,735 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,738 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,740 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,745 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-10-11 16:57:05,746 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-10-11 16:57:05,746 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-10-11 16:57:05,746 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-10-11 16:57:05,747 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05" (1/1) ... [2024-10-11 16:57:05,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-11 16:57:05,765 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/z3 [2024-10-11 16:57:05,785 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-10-11 16:57:05,787 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-10-11 16:57:05,819 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2024-10-11 16:57:05,820 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-10-11 16:57:05,820 INFO L130 BoogieDeclarations]: Found specification of procedure P0 [2024-10-11 16:57:05,820 INFO L138 BoogieDeclarations]: Found implementation of procedure P0 [2024-10-11 16:57:05,820 INFO L130 BoogieDeclarations]: Found specification of procedure P1 [2024-10-11 16:57:05,820 INFO L138 BoogieDeclarations]: Found implementation of procedure P1 [2024-10-11 16:57:05,820 INFO L130 BoogieDeclarations]: Found specification of procedure P2 [2024-10-11 16:57:05,820 INFO L138 BoogieDeclarations]: Found implementation of procedure P2 [2024-10-11 16:57:05,820 INFO L130 BoogieDeclarations]: Found specification of procedure P3 [2024-10-11 16:57:05,821 INFO L138 BoogieDeclarations]: Found implementation of procedure P3 [2024-10-11 16:57:05,821 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-10-11 16:57:05,821 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2024-10-11 16:57:05,821 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-10-11 16:57:05,821 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-10-11 16:57:05,823 WARN L207 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement. [2024-10-11 16:57:05,958 INFO L238 CfgBuilder]: Building ICFG [2024-10-11 16:57:05,960 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-10-11 16:57:07,184 INFO L283 CfgBuilder]: Omitted future-live optimization because the input is a concurrent program. [2024-10-11 16:57:07,185 INFO L287 CfgBuilder]: Performing block encoding [2024-10-11 16:57:11,285 INFO L309 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-10-11 16:57:11,286 INFO L314 CfgBuilder]: Removed 0 assume(true) statements. [2024-10-11 16:57:11,286 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 04:57:11 BoogieIcfgContainer [2024-10-11 16:57:11,286 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-10-11 16:57:11,290 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-10-11 16:57:11,290 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-10-11 16:57:11,292 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-10-11 16:57:11,292 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.10 04:57:05" (1/3) ... [2024-10-11 16:57:11,293 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fe52608 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 04:57:11, skipping insertion in model container [2024-10-11 16:57:11,293 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:57:05" (2/3) ... [2024-10-11 16:57:11,293 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fe52608 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 04:57:11, skipping insertion in model container [2024-10-11 16:57:11,294 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 04:57:11" (3/3) ... [2024-10-11 16:57:11,295 INFO L112 eAbstractionObserver]: Analyzing ICFG mix051_tso.oepc.i [2024-10-11 16:57:11,310 INFO L209 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-10-11 16:57:11,310 INFO L149 ceAbstractionStarter]: Applying trace abstraction to program that has 280 error locations. [2024-10-11 16:57:11,310 INFO L484 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2024-10-11 16:57:11,455 INFO L143 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2024-10-11 16:57:11,489 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 420 places, 410 transitions, 836 flow [2024-10-11 16:57:11,580 INFO L124 PetriNetUnfolderBase]: 3/406 cut-off events. [2024-10-11 16:57:11,580 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-11 16:57:11,591 INFO L83 FinitePrefix]: Finished finitePrefix Result has 419 conditions, 406 events. 3/406 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 100. Compared 2192 event pairs, 0 based on Foata normal form. 0/123 useless extension candidates. Maximal degree in co-relation 369. Up to 2 conditions per place. [2024-10-11 16:57:11,592 INFO L82 GeneralOperation]: Start removeDead. Operand has 420 places, 410 transitions, 836 flow [2024-10-11 16:57:11,609 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 416 places, 406 transitions, 824 flow [2024-10-11 16:57:11,615 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-10-11 16:57:11,620 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;@617b0f67, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-10-11 16:57:11,620 INFO L334 AbstractCegarLoop]: Starting to check reachability of 433 error locations. [2024-10-11 16:57:11,624 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2024-10-11 16:57:11,624 INFO L124 PetriNetUnfolderBase]: 0/45 cut-off events. [2024-10-11 16:57:11,625 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-11 16:57:11,625 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 16:57:11,625 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] [2024-10-11 16:57:11,625 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting P0Err0ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 429 more)] === [2024-10-11 16:57:11,629 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 16:57:11,629 INFO L85 PathProgramCache]: Analyzing trace with hash -178513638, now seen corresponding path program 1 times [2024-10-11 16:57:11,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 16:57:11,636 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822117087] [2024-10-11 16:57:11,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 16:57:11,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 16:57:11,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 16:57:11,871 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-11 16:57:11,874 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 16:57:11,874 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822117087] [2024-10-11 16:57:11,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822117087] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 16:57:11,875 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 16:57:11,875 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-10-11 16:57:11,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315444114] [2024-10-11 16:57:11,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 16:57:11,886 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-10-11 16:57:11,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 16:57:11,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-10-11 16:57:11,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-10-11 16:57:11,939 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 105 out of 410 [2024-10-11 16:57:11,942 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 416 places, 406 transitions, 824 flow. Second operand has 2 states, 2 states have (on average 106.0) internal successors, (212), 2 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-11 16:57:11,942 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 16:57:11,942 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 105 of 410 [2024-10-11 16:57:11,943 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-10-11 16:57:23,577 INFO L124 PetriNetUnfolderBase]: 7720/21539 cut-off events. [2024-10-11 16:57:23,577 INFO L125 PetriNetUnfolderBase]: For 156/156 co-relation queries the response was YES. [2024-10-11 16:57:23,641 INFO L83 FinitePrefix]: Finished finitePrefix Result has 32232 conditions, 21539 events. 7720/21539 cut-off events. For 156/156 co-relation queries the response was YES. Maximal size of possible extension queue 879. Compared 258385 event pairs, 7720 based on Foata normal form. 1819/21918 useless extension candidates. Maximal degree in co-relation 32180. Up to 10376 conditions per place. [2024-10-11 16:57:23,712 INFO L140 encePairwiseOnDemand]: 129/410 looper letters, 23 selfloop transitions, 0 changer transitions 0/123 dead transitions. [2024-10-11 16:57:23,712 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 137 places, 123 transitions, 304 flow [2024-10-11 16:57:23,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-10-11 16:57:23,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2024-10-11 16:57:23,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 514 transitions. [2024-10-11 16:57:23,728 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.6268292682926829 [2024-10-11 16:57:23,730 INFO L175 Difference]: Start difference. First operand has 416 places, 406 transitions, 824 flow. Second operand 2 states and 514 transitions. [2024-10-11 16:57:23,731 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 137 places, 123 transitions, 304 flow [2024-10-11 16:57:23,733 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 133 places, 123 transitions, 300 flow, removed 0 selfloop flow, removed 4 redundant places. [2024-10-11 16:57:23,735 INFO L231 Difference]: Finished difference. Result has 133 places, 123 transitions, 254 flow [2024-10-11 16:57:23,737 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=410, PETRI_DIFFERENCE_MINUEND_FLOW=254, PETRI_DIFFERENCE_MINUEND_PLACES=132, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=123, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=123, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=254, PETRI_PLACES=133, PETRI_TRANSITIONS=123} [2024-10-11 16:57:23,742 INFO L277 CegarLoopForPetriNet]: 416 programPoint places, -283 predicate places. [2024-10-11 16:57:23,742 INFO L471 AbstractCegarLoop]: Abstraction has has 133 places, 123 transitions, 254 flow [2024-10-11 16:57:23,742 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 106.0) internal successors, (212), 2 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-11 16:57:23,742 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 16:57:23,743 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] [2024-10-11 16:57:23,743 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-10-11 16:57:23,743 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 429 more)] === [2024-10-11 16:57:23,744 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 16:57:23,745 INFO L85 PathProgramCache]: Analyzing trace with hash 1359858706, now seen corresponding path program 1 times [2024-10-11 16:57:23,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 16:57:23,745 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168548160] [2024-10-11 16:57:23,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 16:57:23,746 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 16:57:23,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 16:57:23,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-11 16:57:23,910 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 16:57:23,910 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168548160] [2024-10-11 16:57:23,910 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [168548160] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 16:57:23,911 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 16:57:23,911 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-11 16:57:23,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837812776] [2024-10-11 16:57:23,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 16:57:23,913 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-11 16:57:23,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 16:57:23,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-11 16:57:23,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-11 16:57:23,918 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 102 out of 410 [2024-10-11 16:57:23,919 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 133 places, 123 transitions, 254 flow. Second operand has 3 states, 3 states have (on average 104.33333333333333) internal successors, (313), 3 states have internal predecessors, (313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-11 16:57:23,919 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 16:57:23,919 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 102 of 410 [2024-10-11 16:57:23,919 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-10-11 16:57:35,171 INFO L124 PetriNetUnfolderBase]: 11720/30842 cut-off events. [2024-10-11 16:57:35,172 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-11 16:57:35,245 INFO L83 FinitePrefix]: Finished finitePrefix Result has 46782 conditions, 30842 events. 11720/30842 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 855. Compared 361243 event pairs, 3720 based on Foata normal form. 0/28914 useless extension candidates. Maximal degree in co-relation 46779. Up to 10500 conditions per place. [2024-10-11 16:57:35,326 INFO L140 encePairwiseOnDemand]: 408/410 looper letters, 40 selfloop transitions, 1 changer transitions 0/138 dead transitions. [2024-10-11 16:57:35,326 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 134 places, 138 transitions, 366 flow [2024-10-11 16:57:35,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-11 16:57:35,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-10-11 16:57:35,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 348 transitions. [2024-10-11 16:57:35,329 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.28292682926829266 [2024-10-11 16:57:35,329 INFO L175 Difference]: Start difference. First operand has 133 places, 123 transitions, 254 flow. Second operand 3 states and 348 transitions. [2024-10-11 16:57:35,330 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 134 places, 138 transitions, 366 flow [2024-10-11 16:57:35,330 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 134 places, 138 transitions, 366 flow, removed 0 selfloop flow, removed 0 redundant places. [2024-10-11 16:57:35,332 INFO L231 Difference]: Finished difference. Result has 134 places, 122 transitions, 254 flow [2024-10-11 16:57:35,333 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=410, PETRI_DIFFERENCE_MINUEND_FLOW=252, PETRI_DIFFERENCE_MINUEND_PLACES=132, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=122, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=121, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=254, PETRI_PLACES=134, PETRI_TRANSITIONS=122} [2024-10-11 16:57:35,333 INFO L277 CegarLoopForPetriNet]: 416 programPoint places, -282 predicate places. [2024-10-11 16:57:35,333 INFO L471 AbstractCegarLoop]: Abstraction has has 134 places, 122 transitions, 254 flow [2024-10-11 16:57:35,334 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 104.33333333333333) internal successors, (313), 3 states have internal predecessors, (313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-11 16:57:35,334 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 16:57:35,334 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] [2024-10-11 16:57:35,334 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-10-11 16:57:35,334 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr130ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 429 more)] === [2024-10-11 16:57:35,335 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 16:57:35,335 INFO L85 PathProgramCache]: Analyzing trace with hash 611900701, now seen corresponding path program 1 times [2024-10-11 16:57:35,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 16:57:35,335 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895549045] [2024-10-11 16:57:35,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 16:57:35,336 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 16:57:35,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 16:57:35,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-11 16:57:35,486 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 16:57:35,486 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895549045] [2024-10-11 16:57:35,486 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1895549045] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 16:57:35,486 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 16:57:35,486 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-11 16:57:35,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257134382] [2024-10-11 16:57:35,486 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 16:57:35,487 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-11 16:57:35,487 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 16:57:35,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-11 16:57:35,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-11 16:57:35,491 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 102 out of 410 [2024-10-11 16:57:35,491 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 134 places, 122 transitions, 254 flow. Second operand has 3 states, 3 states have (on average 105.0) internal successors, (315), 3 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-11 16:57:35,492 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 16:57:35,492 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 102 of 410 [2024-10-11 16:57:35,492 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand