./Ultimate.py --spec ../sv-benchmarks/c/properties/no-data-race.prp --file ../sv-benchmarks/c/pthread-wmm/safe015_rmo.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/safe015_rmo.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 fa1630ab5b9ca06d45588653daa6fff0d3a2fbd0851a9f5c3999782c5c51eba5 --- Real Ultimate output --- This is Ultimate 0.2.5-tmp.dk.eval-assert-order-craig-803cd42-m [2024-11-22 17:41:25,603 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-22 17:41:25,673 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DataRace-32bit-Automizer_Default.epf [2024-11-22 17:41:25,677 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-22 17:41:25,678 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-22 17:41:25,700 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-22 17:41:25,701 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-22 17:41:25,701 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-22 17:41:25,702 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-22 17:41:25,702 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-22 17:41:25,702 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-11-22 17:41:25,703 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-11-22 17:41:25,703 INFO L153 SettingsManager]: * Use SBE=true [2024-11-22 17:41:25,703 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-22 17:41:25,703 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-22 17:41:25,704 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-22 17:41:25,704 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-22 17:41:25,704 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-22 17:41:25,704 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-22 17:41:25,705 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-22 17:41:25,705 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-22 17:41:25,705 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-22 17:41:25,705 INFO L153 SettingsManager]: * Check absence of data races in concurrent programs=true [2024-11-22 17:41:25,706 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-22 17:41:25,706 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2024-11-22 17:41:25,706 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-22 17:41:25,706 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-22 17:41:25,707 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-22 17:41:25,707 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-22 17:41:25,707 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-11-22 17:41:25,707 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-22 17:41:25,707 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-22 17:41:25,708 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-22 17:41:25,708 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-22 17:41:25,708 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-22 17:41:25,708 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-11-22 17:41:25,708 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-22 17:41:25,709 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-22 17:41:25,709 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-11-22 17:41:25,709 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-11-22 17:41:25,709 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-22 17:41:25,709 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! data-race) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fa1630ab5b9ca06d45588653daa6fff0d3a2fbd0851a9f5c3999782c5c51eba5 [2024-11-22 17:41:25,861 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-22 17:41:25,879 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-22 17:41:25,881 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-22 17:41:25,881 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-22 17:41:25,882 INFO L274 PluginConnector]: CDTParser initialized [2024-11-22 17:41:25,882 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/pthread-wmm/safe015_rmo.i [2024-11-22 17:41:27,378 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-22 17:41:27,654 INFO L384 CDTParser]: Found 1 translation units. [2024-11-22 17:41:27,655 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-wmm/safe015_rmo.i [2024-11-22 17:41:27,676 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19141b875/a9e245ef7aa3407fa08de2c86a69c6e4/FLAG86eed5e28 [2024-11-22 17:41:27,983 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19141b875/a9e245ef7aa3407fa08de2c86a69c6e4 [2024-11-22 17:41:27,986 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-22 17:41:27,988 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-22 17:41:27,993 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-22 17:41:27,994 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-22 17:41:27,999 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-22 17:41:28,000 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 05:41:27" (1/1) ... [2024-11-22 17:41:28,001 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7445080e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28, skipping insertion in model container [2024-11-22 17:41:28,003 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 05:41:27" (1/1) ... [2024-11-22 17:41:28,061 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-22 17:41:28,523 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-22 17:41:28,535 INFO L200 MainTranslator]: Completed pre-run [2024-11-22 17:41:28,702 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-22 17:41:28,745 INFO L204 MainTranslator]: Completed translation [2024-11-22 17:41:28,746 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28 WrapperNode [2024-11-22 17:41:28,746 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-22 17:41:28,747 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-22 17:41:28,747 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-22 17:41:28,748 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-22 17:41:28,754 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28" (1/1) ... [2024-11-22 17:41:28,784 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28" (1/1) ... [2024-11-22 17:41:28,820 INFO L138 Inliner]: procedures = 175, calls = 73, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 786 [2024-11-22 17:41:28,820 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-22 17:41:28,821 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-22 17:41:28,821 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-22 17:41:28,821 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-22 17:41:28,831 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28" (1/1) ... [2024-11-22 17:41:28,831 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28" (1/1) ... [2024-11-22 17:41:28,841 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28" (1/1) ... [2024-11-22 17:41:28,841 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28" (1/1) ... [2024-11-22 17:41:28,890 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28" (1/1) ... [2024-11-22 17:41:28,903 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28" (1/1) ... [2024-11-22 17:41:28,914 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28" (1/1) ... [2024-11-22 17:41:28,922 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28" (1/1) ... [2024-11-22 17:41:28,937 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-22 17:41:28,940 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-22 17:41:28,940 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-22 17:41:28,940 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-22 17:41:28,941 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28" (1/1) ... [2024-11-22 17:41:28,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-22 17:41:28,954 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-22 17:41:28,978 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 17:41:28,987 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 17:41:29,024 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2024-11-22 17:41:29,024 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2024-11-22 17:41:29,024 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2024-11-22 17:41:29,024 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-22 17:41:29,024 INFO L130 BoogieDeclarations]: Found specification of procedure P0 [2024-11-22 17:41:29,025 INFO L138 BoogieDeclarations]: Found implementation of procedure P0 [2024-11-22 17:41:29,025 INFO L130 BoogieDeclarations]: Found specification of procedure P1 [2024-11-22 17:41:29,025 INFO L138 BoogieDeclarations]: Found implementation of procedure P1 [2024-11-22 17:41:29,025 INFO L130 BoogieDeclarations]: Found specification of procedure P2 [2024-11-22 17:41:29,025 INFO L138 BoogieDeclarations]: Found implementation of procedure P2 [2024-11-22 17:41:29,025 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-22 17:41:29,025 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2024-11-22 17:41:29,025 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-22 17:41:29,025 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-22 17:41:29,028 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 17:41:29,228 INFO L238 CfgBuilder]: Building ICFG [2024-11-22 17:41:29,230 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-22 17:41:31,071 INFO L283 CfgBuilder]: Omitted future-live optimization because the input is a concurrent program. [2024-11-22 17:41:31,071 INFO L287 CfgBuilder]: Performing block encoding [2024-11-22 17:41:45,861 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-22 17:41:45,862 INFO L316 CfgBuilder]: Removed 0 assume(true) statements. [2024-11-22 17:41:45,862 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 05:41:45 BoogieIcfgContainer [2024-11-22 17:41:45,862 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-22 17:41:45,864 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-22 17:41:45,864 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-22 17:41:45,867 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-22 17:41:45,867 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 05:41:27" (1/3) ... [2024-11-22 17:41:45,868 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@528428ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 05:41:45, skipping insertion in model container [2024-11-22 17:41:45,868 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 05:41:28" (2/3) ... [2024-11-22 17:41:45,868 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@528428ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 05:41:45, skipping insertion in model container [2024-11-22 17:41:45,868 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 05:41:45" (3/3) ... [2024-11-22 17:41:45,869 INFO L112 eAbstractionObserver]: Analyzing ICFG safe015_rmo.i [2024-11-22 17:41:45,883 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-22 17:41:45,884 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 399 error locations. [2024-11-22 17:41:45,884 INFO L489 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2024-11-22 17:41:47,178 INFO L143 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2024-11-22 17:41:47,227 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 536 places, 529 transitions, 1070 flow [2024-11-22 17:41:48,034 INFO L124 PetriNetUnfolderBase]: 3/526 cut-off events. [2024-11-22 17:41:48,036 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-11-22 17:41:48,055 INFO L83 FinitePrefix]: Finished finitePrefix Result has 536 conditions, 526 events. 3/526 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 108. Compared 3711 event pairs, 0 based on Foata normal form. 0/124 useless extension candidates. Maximal degree in co-relation 473. Up to 2 conditions per place. [2024-11-22 17:41:48,055 INFO L82 GeneralOperation]: Start removeDead. Operand has 536 places, 529 transitions, 1070 flow [2024-11-22 17:41:48,078 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 533 places, 526 transitions, 1061 flow [2024-11-22 17:41:48,090 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-22 17:41:48,097 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;@6bda7222, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-22 17:41:48,098 INFO L334 AbstractCegarLoop]: Starting to check reachability of 662 error locations. [2024-11-22 17:41:48,106 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2024-11-22 17:41:48,106 INFO L124 PetriNetUnfolderBase]: 0/60 cut-off events. [2024-11-22 17:41:48,106 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-11-22 17:41:48,106 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-22 17:41:48,107 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] [2024-11-22 17:41:48,108 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting P0Err0ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 658 more)] === [2024-11-22 17:41:48,112 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-22 17:41:48,113 INFO L85 PathProgramCache]: Analyzing trace with hash 1233606789, now seen corresponding path program 1 times [2024-11-22 17:41:48,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-22 17:41:48,122 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270954386] [2024-11-22 17:41:48,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-22 17:41:48,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-22 17:41:48,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-22 17:41:48,446 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 17:41:48,446 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-22 17:41:48,447 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270954386] [2024-11-22 17:41:48,447 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270954386] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-22 17:41:48,447 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-22 17:41:48,447 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-11-22 17:41:48,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527357869] [2024-11-22 17:41:48,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-22 17:41:48,455 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-11-22 17:41:48,459 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-22 17:41:48,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-11-22 17:41:48,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-22 17:41:48,481 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 111 out of 529 [2024-11-22 17:41:48,483 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 533 places, 526 transitions, 1061 flow. Second operand has 2 states, 2 states have (on average 112.0) internal successors, (224), 2 states have internal predecessors, (224), 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 17:41:48,483 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-22 17:41:48,483 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 111 of 529 [2024-11-22 17:41:48,484 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-11-22 17:41:51,594 INFO L124 PetriNetUnfolderBase]: 875/3170 cut-off events. [2024-11-22 17:41:51,595 INFO L125 PetriNetUnfolderBase]: For 25/25 co-relation queries the response was YES. [2024-11-22 17:41:51,601 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4524 conditions, 3170 events. 875/3170 cut-off events. For 25/25 co-relation queries the response was YES. Maximal size of possible extension queue 145. Compared 29810 event pairs, 875 based on Foata normal form. 274/3179 useless extension candidates. Maximal degree in co-relation 4459. Up to 1300 conditions per place. [2024-11-22 17:41:51,613 INFO L140 encePairwiseOnDemand]: 129/529 looper letters, 17 selfloop transitions, 0 changer transitions 0/124 dead transitions. [2024-11-22 17:41:51,614 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 135 places, 124 transitions, 291 flow [2024-11-22 17:41:51,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-11-22 17:41:51,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2024-11-22 17:41:51,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 639 transitions. [2024-11-22 17:41:51,626 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.6039697542533081 [2024-11-22 17:41:51,628 INFO L175 Difference]: Start difference. First operand has 533 places, 526 transitions, 1061 flow. Second operand 2 states and 639 transitions. [2024-11-22 17:41:51,629 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 135 places, 124 transitions, 291 flow [2024-11-22 17:41:51,631 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 132 places, 124 transitions, 288 flow, removed 0 selfloop flow, removed 3 redundant places. [2024-11-22 17:41:51,633 INFO L231 Difference]: Finished difference. Result has 132 places, 124 transitions, 254 flow [2024-11-22 17:41:51,635 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=529, PETRI_DIFFERENCE_MINUEND_FLOW=254, PETRI_DIFFERENCE_MINUEND_PLACES=131, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=124, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=124, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=254, PETRI_PLACES=132, PETRI_TRANSITIONS=124} [2024-11-22 17:41:51,642 INFO L277 CegarLoopForPetriNet]: 533 programPoint places, -401 predicate places. [2024-11-22 17:41:51,642 INFO L471 AbstractCegarLoop]: Abstraction has has 132 places, 124 transitions, 254 flow [2024-11-22 17:41:51,642 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 112.0) internal successors, (224), 2 states have internal predecessors, (224), 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 17:41:51,642 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-22 17:41:51,643 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] [2024-11-22 17:41:51,643 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-22 17:41:51,643 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 658 more)] === [2024-11-22 17:41:51,643 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-22 17:41:51,643 INFO L85 PathProgramCache]: Analyzing trace with hash -1643897404, now seen corresponding path program 1 times [2024-11-22 17:41:51,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-22 17:41:51,644 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591483046] [2024-11-22 17:41:51,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-22 17:41:51,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-22 17:41:51,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-22 17:41:51,840 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 17:41:51,840 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-22 17:41:51,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591483046] [2024-11-22 17:41:51,840 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591483046] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-22 17:41:51,841 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-22 17:41:51,841 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-22 17:41:51,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247623264] [2024-11-22 17:41:51,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-22 17:41:51,842 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-22 17:41:51,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-22 17:41:51,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-22 17:41:51,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-22 17:41:51,849 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 108 out of 529 [2024-11-22 17:41:51,850 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 132 places, 124 transitions, 254 flow. Second operand has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 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 17:41:51,850 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-22 17:41:51,850 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 108 of 529 [2024-11-22 17:41:51,850 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-11-22 17:41:56,835 INFO L124 PetriNetUnfolderBase]: 1345/4478 cut-off events. [2024-11-22 17:41:56,836 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-11-22 17:41:56,846 INFO L83 FinitePrefix]: Finished finitePrefix Result has 6500 conditions, 4478 events. 1345/4478 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 144. Compared 41672 event pairs, 405 based on Foata normal form. 0/4162 useless extension candidates. Maximal degree in co-relation 6497. Up to 1340 conditions per place. [2024-11-22 17:41:56,863 INFO L140 encePairwiseOnDemand]: 527/529 looper letters, 29 selfloop transitions, 1 changer transitions 0/134 dead transitions. [2024-11-22 17:41:56,864 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 133 places, 134 transitions, 334 flow [2024-11-22 17:41:56,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-22 17:41:56,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-11-22 17:41:56,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 355 transitions. [2024-11-22 17:41:56,870 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.2236925015752993 [2024-11-22 17:41:56,870 INFO L175 Difference]: Start difference. First operand has 132 places, 124 transitions, 254 flow. Second operand 3 states and 355 transitions. [2024-11-22 17:41:56,870 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 133 places, 134 transitions, 334 flow [2024-11-22 17:41:56,871 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 133 places, 134 transitions, 334 flow, removed 0 selfloop flow, removed 0 redundant places. [2024-11-22 17:41:56,875 INFO L231 Difference]: Finished difference. Result has 133 places, 123 transitions, 254 flow [2024-11-22 17:41:56,876 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=529, PETRI_DIFFERENCE_MINUEND_FLOW=252, PETRI_DIFFERENCE_MINUEND_PLACES=131, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=123, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=122, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=254, PETRI_PLACES=133, PETRI_TRANSITIONS=123} [2024-11-22 17:41:56,876 INFO L277 CegarLoopForPetriNet]: 533 programPoint places, -400 predicate places. [2024-11-22 17:41:56,877 INFO L471 AbstractCegarLoop]: Abstraction has has 133 places, 123 transitions, 254 flow [2024-11-22 17:41:56,877 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 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 17:41:56,877 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-22 17:41:56,878 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, 1, 1, 1, 1, 1, 1] [2024-11-22 17:41:56,878 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-22 17:41:56,878 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr138ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 658 more)] === [2024-11-22 17:41:56,879 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-22 17:41:56,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1884910471, now seen corresponding path program 1 times [2024-11-22 17:41:56,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-22 17:41:56,880 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969095921] [2024-11-22 17:41:56,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-22 17:41:56,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-22 17:41:57,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-22 17:41:57,187 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 17:41:57,188 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-22 17:41:57,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969095921] [2024-11-22 17:41:57,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969095921] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-22 17:41:57,188 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-22 17:41:57,189 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-22 17:41:57,189 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778809589] [2024-11-22 17:41:57,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-22 17:41:57,189 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-22 17:41:57,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-22 17:41:57,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-22 17:41:57,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-22 17:41:57,195 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 108 out of 529 [2024-11-22 17:41:57,196 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 133 places, 123 transitions, 254 flow. Second operand has 3 states, 3 states have (on average 110.66666666666667) internal successors, (332), 3 states have internal predecessors, (332), 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 17:41:57,196 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-22 17:41:57,196 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 108 of 529 [2024-11-22 17:41:57,196 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand