./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/mix043.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/mix043.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 9bfd96daa3950021158d7079dc25a62741fa5d5a7f9e521049c1a78760db50f1 --- Real Ultimate output --- This is Ultimate 0.2.5-dev-84cfde4 [2024-10-11 16:56:25,584 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-10-11 16:56:25,641 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/config/svcomp-DataRace-32bit-Automizer_Default.epf [2024-10-11 16:56:25,647 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-10-11 16:56:25,648 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-10-11 16:56:25,674 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-10-11 16:56:25,674 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-10-11 16:56:25,674 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-10-11 16:56:25,675 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-10-11 16:56:25,678 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-10-11 16:56:25,678 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-10-11 16:56:25,678 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-10-11 16:56:25,679 INFO L153 SettingsManager]: * Use SBE=true [2024-10-11 16:56:25,679 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-10-11 16:56:25,679 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-10-11 16:56:25,679 INFO L153 SettingsManager]: * sizeof long=4 [2024-10-11 16:56:25,680 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-10-11 16:56:25,681 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-10-11 16:56:25,681 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-10-11 16:56:25,682 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-10-11 16:56:25,682 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-10-11 16:56:25,682 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-10-11 16:56:25,682 INFO L153 SettingsManager]: * Check absence of data races in concurrent programs=true [2024-10-11 16:56:25,683 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-10-11 16:56:25,683 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2024-10-11 16:56:25,683 INFO L153 SettingsManager]: * sizeof long double=12 [2024-10-11 16:56:25,683 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-10-11 16:56:25,683 INFO L153 SettingsManager]: * Use constant arrays=true [2024-10-11 16:56:25,684 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-10-11 16:56:25,684 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-10-11 16:56:25,684 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-10-11 16:56:25,684 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-11 16:56:25,684 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-10-11 16:56:25,685 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-10-11 16:56:25,685 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-10-11 16:56:25,685 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-10-11 16:56:25,685 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-10-11 16:56:25,685 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-10-11 16:56:25,685 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-10-11 16:56:25,685 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-10-11 16:56:25,686 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-10-11 16:56:25,687 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! data-race) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9bfd96daa3950021158d7079dc25a62741fa5d5a7f9e521049c1a78760db50f1 [2024-10-11 16:56:25,916 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-10-11 16:56:25,952 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-10-11 16:56:25,955 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-10-11 16:56:25,956 INFO L270 PluginConnector]: Initializing CDTParser... [2024-10-11 16:56:25,956 INFO L274 PluginConnector]: CDTParser initialized [2024-10-11 16:56:25,957 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-wmm/mix043.oepc.i [2024-10-11 16:56:27,180 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-10-11 16:56:27,425 INFO L384 CDTParser]: Found 1 translation units. [2024-10-11 16:56:27,426 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-wmm/mix043.oepc.i [2024-10-11 16:56:27,437 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/data/00fbebdbe/fec83de30ae0494aa39f7a744190400b/FLAGf9ab5e789 [2024-10-11 16:56:27,805 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/data/00fbebdbe/fec83de30ae0494aa39f7a744190400b [2024-10-11 16:56:27,811 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-10-11 16:56:27,812 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-10-11 16:56:27,813 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-10-11 16:56:27,813 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-10-11 16:56:27,817 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-10-11 16:56:27,819 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 04:56:27" (1/1) ... [2024-10-11 16:56:27,819 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26d9b82a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:27, skipping insertion in model container [2024-10-11 16:56:27,819 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 04:56:27" (1/1) ... [2024-10-11 16:56:27,853 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-10-11 16:56:28,155 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-11 16:56:28,168 INFO L200 MainTranslator]: Completed pre-run [2024-10-11 16:56:28,273 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-11 16:56:28,308 INFO L204 MainTranslator]: Completed translation [2024-10-11 16:56:28,308 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28 WrapperNode [2024-10-11 16:56:28,308 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-10-11 16:56:28,309 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-10-11 16:56:28,309 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-10-11 16:56:28,309 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-10-11 16:56:28,315 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28" (1/1) ... [2024-10-11 16:56:28,338 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28" (1/1) ... [2024-10-11 16:56:28,369 INFO L138 Inliner]: procedures = 176, calls = 56, calls flagged for inlining = 6, calls inlined = 7, statements flattened = 507 [2024-10-11 16:56:28,369 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-10-11 16:56:28,370 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-10-11 16:56:28,370 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-10-11 16:56:28,370 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-10-11 16:56:28,380 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28" (1/1) ... [2024-10-11 16:56:28,381 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28" (1/1) ... [2024-10-11 16:56:28,392 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28" (1/1) ... [2024-10-11 16:56:28,392 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28" (1/1) ... [2024-10-11 16:56:28,413 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28" (1/1) ... [2024-10-11 16:56:28,423 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28" (1/1) ... [2024-10-11 16:56:28,426 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28" (1/1) ... [2024-10-11 16:56:28,430 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28" (1/1) ... [2024-10-11 16:56:28,434 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-10-11 16:56:28,435 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-10-11 16:56:28,435 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-10-11 16:56:28,435 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-10-11 16:56:28,436 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28" (1/1) ... [2024-10-11 16:56:28,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-11 16:56:28,450 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/z3 [2024-10-11 16:56:28,500 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 16:56:28,520 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 16:56:28,603 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2024-10-11 16:56:28,603 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-10-11 16:56:28,604 INFO L130 BoogieDeclarations]: Found specification of procedure P0 [2024-10-11 16:56:28,604 INFO L138 BoogieDeclarations]: Found implementation of procedure P0 [2024-10-11 16:56:28,604 INFO L130 BoogieDeclarations]: Found specification of procedure P1 [2024-10-11 16:56:28,604 INFO L138 BoogieDeclarations]: Found implementation of procedure P1 [2024-10-11 16:56:28,604 INFO L130 BoogieDeclarations]: Found specification of procedure P2 [2024-10-11 16:56:28,605 INFO L138 BoogieDeclarations]: Found implementation of procedure P2 [2024-10-11 16:56:28,605 INFO L130 BoogieDeclarations]: Found specification of procedure P3 [2024-10-11 16:56:28,606 INFO L138 BoogieDeclarations]: Found implementation of procedure P3 [2024-10-11 16:56:28,606 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-10-11 16:56:28,606 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2024-10-11 16:56:28,606 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-10-11 16:56:28,606 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-10-11 16:56:28,609 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 16:56:28,751 INFO L238 CfgBuilder]: Building ICFG [2024-10-11 16:56:28,752 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-10-11 16:56:29,885 INFO L283 CfgBuilder]: Omitted future-live optimization because the input is a concurrent program. [2024-10-11 16:56:29,885 INFO L287 CfgBuilder]: Performing block encoding [2024-10-11 16:56:33,922 INFO L309 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-10-11 16:56:33,922 INFO L314 CfgBuilder]: Removed 0 assume(true) statements. [2024-10-11 16:56:33,923 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 04:56:33 BoogieIcfgContainer [2024-10-11 16:56:33,923 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-10-11 16:56:33,924 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-10-11 16:56:33,924 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-10-11 16:56:33,927 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-10-11 16:56:33,927 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.10 04:56:27" (1/3) ... [2024-10-11 16:56:33,928 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@787742ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 04:56:33, skipping insertion in model container [2024-10-11 16:56:33,928 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 04:56:28" (2/3) ... [2024-10-11 16:56:33,928 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@787742ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 04:56:33, skipping insertion in model container [2024-10-11 16:56:33,928 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 04:56:33" (3/3) ... [2024-10-11 16:56:33,929 INFO L112 eAbstractionObserver]: Analyzing ICFG mix043.oepc.i [2024-10-11 16:56:33,949 INFO L209 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-10-11 16:56:33,952 INFO L149 ceAbstractionStarter]: Applying trace abstraction to program that has 284 error locations. [2024-10-11 16:56:33,952 INFO L484 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2024-10-11 16:56:34,155 INFO L143 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2024-10-11 16:56:34,194 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 428 places, 418 transitions, 852 flow [2024-10-11 16:56:34,413 INFO L124 PetriNetUnfolderBase]: 3/414 cut-off events. [2024-10-11 16:56:34,414 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-11 16:56:34,424 INFO L83 FinitePrefix]: Finished finitePrefix Result has 427 conditions, 414 events. 3/414 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 99. Compared 2206 event pairs, 0 based on Foata normal form. 0/127 useless extension candidates. Maximal degree in co-relation 375. Up to 2 conditions per place. [2024-10-11 16:56:34,424 INFO L82 GeneralOperation]: Start removeDead. Operand has 428 places, 418 transitions, 852 flow [2024-10-11 16:56:34,440 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 424 places, 414 transitions, 840 flow [2024-10-11 16:56:34,446 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-10-11 16:56:34,450 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;@2e2409a7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-10-11 16:56:34,450 INFO L334 AbstractCegarLoop]: Starting to check reachability of 534 error locations. [2024-10-11 16:56:34,456 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2024-10-11 16:56:34,456 INFO L124 PetriNetUnfolderBase]: 0/48 cut-off events. [2024-10-11 16:56:34,456 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-11 16:56:34,456 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 16:56:34,457 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] [2024-10-11 16:56:34,457 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting P0Err0ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 530 more)] === [2024-10-11 16:56:34,460 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 16:56:34,461 INFO L85 PathProgramCache]: Analyzing trace with hash 517072055, now seen corresponding path program 1 times [2024-10-11 16:56:34,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 16:56:34,467 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769733126] [2024-10-11 16:56:34,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 16:56:34,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 16:56:34,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 16:56:34,628 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 16:56:34,629 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 16:56:34,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769733126] [2024-10-11 16:56:34,629 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [769733126] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 16:56:34,630 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 16:56:34,630 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-10-11 16:56:34,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35485016] [2024-10-11 16:56:34,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 16:56:34,637 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-10-11 16:56:34,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 16:56:34,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-10-11 16:56:34,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-10-11 16:56:34,659 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 107 out of 418 [2024-10-11 16:56:34,661 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 424 places, 414 transitions, 840 flow. Second operand has 2 states, 2 states have (on average 108.0) internal successors, (216), 2 states have internal predecessors, (216), 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 16:56:34,662 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 16:56:34,662 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 107 of 418 [2024-10-11 16:56:34,662 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-10-11 16:56:44,933 INFO L124 PetriNetUnfolderBase]: 10870/29691 cut-off events. [2024-10-11 16:56:44,933 INFO L125 PetriNetUnfolderBase]: For 156/156 co-relation queries the response was YES. [2024-10-11 16:56:45,045 INFO L83 FinitePrefix]: Finished finitePrefix Result has 44534 conditions, 29691 events. 10870/29691 cut-off events. For 156/156 co-relation queries the response was YES. Maximal size of possible extension queue 1206. Compared 369502 event pairs, 10870 based on Foata normal form. 2568/30315 useless extension candidates. Maximal degree in co-relation 44480. Up to 14526 conditions per place. [2024-10-11 16:56:45,156 INFO L140 encePairwiseOnDemand]: 133/418 looper letters, 25 selfloop transitions, 0 changer transitions 0/127 dead transitions. [2024-10-11 16:56:45,156 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 141 places, 127 transitions, 316 flow [2024-10-11 16:56:45,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-10-11 16:56:45,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2024-10-11 16:56:45,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 524 transitions. [2024-10-11 16:56:45,176 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.6267942583732058 [2024-10-11 16:56:45,179 INFO L175 Difference]: Start difference. First operand has 424 places, 414 transitions, 840 flow. Second operand 2 states and 524 transitions. [2024-10-11 16:56:45,180 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 141 places, 127 transitions, 316 flow [2024-10-11 16:56:45,182 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 137 places, 127 transitions, 312 flow, removed 0 selfloop flow, removed 4 redundant places. [2024-10-11 16:56:45,185 INFO L231 Difference]: Finished difference. Result has 137 places, 127 transitions, 262 flow [2024-10-11 16:56:45,187 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=418, PETRI_DIFFERENCE_MINUEND_FLOW=262, PETRI_DIFFERENCE_MINUEND_PLACES=136, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=127, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=127, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=262, PETRI_PLACES=137, PETRI_TRANSITIONS=127} [2024-10-11 16:56:45,190 INFO L277 CegarLoopForPetriNet]: 424 programPoint places, -287 predicate places. [2024-10-11 16:56:45,190 INFO L471 AbstractCegarLoop]: Abstraction has has 137 places, 127 transitions, 262 flow [2024-10-11 16:56:45,190 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 108.0) internal successors, (216), 2 states have internal predecessors, (216), 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 16:56:45,190 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 16:56:45,190 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] [2024-10-11 16:56:45,191 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-10-11 16:56:45,191 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 530 more)] === [2024-10-11 16:56:45,194 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 16:56:45,194 INFO L85 PathProgramCache]: Analyzing trace with hash -83978550, now seen corresponding path program 1 times [2024-10-11 16:56:45,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 16:56:45,195 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496805342] [2024-10-11 16:56:45,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 16:56:45,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 16:56:45,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 16:56:45,356 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 16:56:45,356 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 16:56:45,356 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496805342] [2024-10-11 16:56:45,356 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496805342] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 16:56:45,356 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 16:56:45,357 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-11 16:56:45,357 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642516189] [2024-10-11 16:56:45,357 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 16:56:45,358 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-11 16:56:45,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 16:56:45,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-11 16:56:45,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-11 16:56:45,363 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 104 out of 418 [2024-10-11 16:56:45,366 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 137 places, 127 transitions, 262 flow. Second operand has 3 states, 3 states have (on average 106.33333333333333) internal successors, (319), 3 states have internal predecessors, (319), 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 16:56:45,366 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 16:56:45,366 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 104 of 418 [2024-10-11 16:56:45,367 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-10-11 16:56:57,861 INFO L124 PetriNetUnfolderBase]: 16570/42944 cut-off events. [2024-10-11 16:56:57,861 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-11 16:56:57,990 INFO L83 FinitePrefix]: Finished finitePrefix Result has 65234 conditions, 42944 events. 16570/42944 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 1178. Compared 521869 event pairs, 5170 based on Foata normal form. 0/40267 useless extension candidates. Maximal degree in co-relation 65231. Up to 14900 conditions per place. [2024-10-11 16:56:58,128 INFO L140 encePairwiseOnDemand]: 416/418 looper letters, 44 selfloop transitions, 1 changer transitions 0/144 dead transitions. [2024-10-11 16:56:58,129 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 138 places, 144 transitions, 386 flow [2024-10-11 16:56:58,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-11 16:56:58,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-10-11 16:56:58,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 358 transitions. [2024-10-11 16:56:58,131 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.28548644338118023 [2024-10-11 16:56:58,132 INFO L175 Difference]: Start difference. First operand has 137 places, 127 transitions, 262 flow. Second operand 3 states and 358 transitions. [2024-10-11 16:56:58,132 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 138 places, 144 transitions, 386 flow [2024-10-11 16:56:58,133 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 138 places, 144 transitions, 386 flow, removed 0 selfloop flow, removed 0 redundant places. [2024-10-11 16:56:58,135 INFO L231 Difference]: Finished difference. Result has 138 places, 126 transitions, 262 flow [2024-10-11 16:56:58,136 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=418, PETRI_DIFFERENCE_MINUEND_FLOW=260, PETRI_DIFFERENCE_MINUEND_PLACES=136, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=126, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=125, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=262, PETRI_PLACES=138, PETRI_TRANSITIONS=126} [2024-10-11 16:56:58,136 INFO L277 CegarLoopForPetriNet]: 424 programPoint places, -286 predicate places. [2024-10-11 16:56:58,137 INFO L471 AbstractCegarLoop]: Abstraction has has 138 places, 126 transitions, 262 flow [2024-10-11 16:56:58,137 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 106.33333333333333) internal successors, (319), 3 states have internal predecessors, (319), 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 16:56:58,138 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 16:56:58,138 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] [2024-10-11 16:56:58,138 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-10-11 16:56:58,138 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr37ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 530 more)] === [2024-10-11 16:56:58,139 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 16:56:58,139 INFO L85 PathProgramCache]: Analyzing trace with hash -1266267805, now seen corresponding path program 1 times [2024-10-11 16:56:58,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 16:56:58,140 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907394059] [2024-10-11 16:56:58,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 16:56:58,140 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 16:56:58,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 16:56:58,281 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 16:56:58,282 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 16:56:58,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907394059] [2024-10-11 16:56:58,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [907394059] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 16:56:58,283 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 16:56:58,283 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-11 16:56:58,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437319399] [2024-10-11 16:56:58,284 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 16:56:58,285 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-11 16:56:58,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 16:56:58,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-11 16:56:58,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-11 16:56:58,290 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 104 out of 418 [2024-10-11 16:56:58,290 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 138 places, 126 transitions, 262 flow. Second operand has 3 states, 3 states have (on average 107.0) internal successors, (321), 3 states have internal predecessors, (321), 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 16:56:58,291 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 16:56:58,291 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 104 of 418 [2024-10-11 16:56:58,291 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand