/root/.sdkman/candidates/java/21.0.5-tem/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata ./data -tc ../benchexec/../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../benchexec/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.automaton.type.used.in.concurrency.analysis PETRI_NET -i ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_61-invariant_racing.i -------------------------------------------------------------------------------- This is Ultimate 0.3.0-wip.dk.cfg-lbe-improvements-94356ea-m [2025-04-13 19:42:49,889 INFO L188 SettingsManager]: Resetting all preferences to default values... [2025-04-13 19:42:49,941 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../benchexec/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2025-04-13 19:42:49,947 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2025-04-13 19:42:49,947 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2025-04-13 19:42:49,964 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2025-04-13 19:42:49,965 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2025-04-13 19:42:49,965 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2025-04-13 19:42:49,965 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2025-04-13 19:42:49,965 INFO L153 SettingsManager]: * Use memory slicer=true [2025-04-13 19:42:49,965 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2025-04-13 19:42:49,965 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2025-04-13 19:42:49,965 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2025-04-13 19:42:49,965 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * Use SBE=true [2025-04-13 19:42:49,966 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * sizeof long=4 [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * sizeof POINTER=4 [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * sizeof long double=12 [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * Behaviour of calls to undefined functions=OVERAPPROXIMATE_BEHAVIOUR [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * Use constant arrays=true [2025-04-13 19:42:49,966 INFO L151 SettingsManager]: Preferences of IcfgBuilder differ from their defaults: [2025-04-13 19:42:49,966 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-04-13 19:42:49,967 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-04-13 19:42:49,967 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * Compute procedure contracts=false [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2025-04-13 19:42:49,967 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2025-04-13 19:42:49,968 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2025-04-13 19:42:49,968 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Automaton type used in concurrency analysis -> PETRI_NET [2025-04-13 19:42:50,180 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2025-04-13 19:42:50,186 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2025-04-13 19:42:50,188 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2025-04-13 19:42:50,188 INFO L270 PluginConnector]: Initializing CDTParser... [2025-04-13 19:42:50,190 INFO L274 PluginConnector]: CDTParser initialized [2025-04-13 19:42:50,191 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_61-invariant_racing.i [2025-04-13 19:42:51,466 INFO L538 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/30969a2b1/5a3f6921391745bc85f86b43879db29b/FLAG5606b468e [2025-04-13 19:42:51,755 INFO L389 CDTParser]: Found 1 translation units. [2025-04-13 19:42:51,755 INFO L178 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_61-invariant_racing.i [2025-04-13 19:42:51,771 INFO L432 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/30969a2b1/5a3f6921391745bc85f86b43879db29b/FLAG5606b468e [2025-04-13 19:42:52,468 INFO L440 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/30969a2b1/5a3f6921391745bc85f86b43879db29b [2025-04-13 19:42:52,471 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2025-04-13 19:42:52,472 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2025-04-13 19:42:52,472 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2025-04-13 19:42:52,473 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2025-04-13 19:42:52,480 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2025-04-13 19:42:52,481 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,481 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8f137c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52, skipping insertion in model container [2025-04-13 19:42:52,481 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,507 INFO L175 MainTranslator]: Built tables and reachable declarations [2025-04-13 19:42:52,753 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_61-invariant_racing.i[30176,30189] [2025-04-13 19:42:52,775 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-04-13 19:42:52,792 INFO L200 MainTranslator]: Completed pre-run [2025-04-13 19:42:52,841 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_61-invariant_racing.i[30176,30189] [2025-04-13 19:42:52,851 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-04-13 19:42:52,880 INFO L204 MainTranslator]: Completed translation [2025-04-13 19:42:52,880 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52 WrapperNode [2025-04-13 19:42:52,880 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2025-04-13 19:42:52,881 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2025-04-13 19:42:52,881 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2025-04-13 19:42:52,881 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2025-04-13 19:42:52,885 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,898 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,912 INFO L138 Inliner]: procedures = 171, calls = 43, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 96 [2025-04-13 19:42:52,912 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2025-04-13 19:42:52,913 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2025-04-13 19:42:52,913 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2025-04-13 19:42:52,913 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2025-04-13 19:42:52,920 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,921 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,926 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,940 INFO L175 MemorySlicer]: Split 14 memory accesses to 4 slices as follows [2, 5, 5, 2]. 36 percent of accesses are in the largest equivalence class. The 12 initializations are split as follows [2, 5, 5, 0]. The 1 writes are split as follows [0, 0, 0, 1]. [2025-04-13 19:42:52,940 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,940 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,951 INFO L184 PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,952 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,955 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,956 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,957 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,961 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2025-04-13 19:42:52,962 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2025-04-13 19:42:52,962 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2025-04-13 19:42:52,962 INFO L274 PluginConnector]: RCFGBuilder initialized [2025-04-13 19:42:52,963 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (1/1) ... [2025-04-13 19:42:52,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-04-13 19:42:52,975 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-04-13 19:42:52,987 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2025-04-13 19:42:52,990 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2025-04-13 19:42:53,009 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2025-04-13 19:42:53,009 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2025-04-13 19:42:53,009 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2025-04-13 19:42:53,009 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#3 [2025-04-13 19:42:53,009 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2025-04-13 19:42:53,009 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2025-04-13 19:42:53,009 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2025-04-13 19:42:53,009 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#3 [2025-04-13 19:42:53,009 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2025-04-13 19:42:53,009 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2025-04-13 19:42:53,010 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2025-04-13 19:42:53,010 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2025-04-13 19:42:53,010 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2025-04-13 19:42:53,010 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2025-04-13 19:42:53,010 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2025-04-13 19:42:53,010 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2025-04-13 19:42:53,010 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2025-04-13 19:42:53,010 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2025-04-13 19:42:53,010 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexUnlock [2025-04-13 19:42:53,010 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2025-04-13 19:42:53,010 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2025-04-13 19:42:53,011 WARN L203 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement. [2025-04-13 19:42:53,128 INFO L234 CfgBuilder]: Building ICFG [2025-04-13 19:42:53,130 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2025-04-13 19:42:53,321 INFO L279 CfgBuilder]: Omitted future-live optimization because the input is a concurrent program. [2025-04-13 19:42:53,322 INFO L289 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2025-04-13 19:42:53,322 INFO L294 CfgBuilder]: Performing block encoding [2025-04-13 19:42:53,446 WARN L179 LargeBlockEncoding]: Complex 2:2 sequential composition. Such compositions can cause exponential blowup and should not occur in structured programs. [2025-04-13 19:42:53,456 WARN L179 LargeBlockEncoding]: Complex 2:2 sequential composition. Such compositions can cause exponential blowup and should not occur in structured programs. [2025-04-13 19:42:53,458 WARN L179 LargeBlockEncoding]: Complex 2:2 sequential composition. Such compositions can cause exponential blowup and should not occur in structured programs. [2025-04-13 19:42:53,458 WARN L179 LargeBlockEncoding]: Complex 2:2 sequential composition. Such compositions can cause exponential blowup and should not occur in structured programs. [2025-04-13 19:42:53,459 WARN L179 LargeBlockEncoding]: Complex 2:2 sequential composition. Such compositions can cause exponential blowup and should not occur in structured programs. [2025-04-13 19:42:53,465 WARN L179 LargeBlockEncoding]: Complex 4:2 sequential composition. Such compositions can cause exponential blowup and should not occur in structured programs. [2025-04-13 19:42:53,472 INFO L313 CfgBuilder]: Removed 7 assume(true) statements. [2025-04-13 19:42:53,472 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.04 07:42:53 BoogieIcfgContainer [2025-04-13 19:42:53,472 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2025-04-13 19:42:53,475 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2025-04-13 19:42:53,475 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2025-04-13 19:42:53,478 INFO L274 PluginConnector]: TraceAbstraction initialized [2025-04-13 19:42:53,478 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.04 07:42:52" (1/3) ... [2025-04-13 19:42:53,479 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b39f1db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.04 07:42:53, skipping insertion in model container [2025-04-13 19:42:53,479 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.04 07:42:52" (2/3) ... [2025-04-13 19:42:53,479 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b39f1db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.04 07:42:53, skipping insertion in model container [2025-04-13 19:42:53,479 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.04 07:42:53" (3/3) ... [2025-04-13 19:42:53,480 INFO L128 eAbstractionObserver]: Analyzing ICFG 28-race_reach_61-invariant_racing.i [2025-04-13 19:42:53,489 INFO L217 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2025-04-13 19:42:53,491 INFO L151 ceAbstractionStarter]: Applying trace abstraction to ICFG 28-race_reach_61-invariant_racing.i that has 2 procedures, 45 locations, 66 edges, 1 initial locations, 9 loop locations, and 1 error locations. [2025-04-13 19:42:53,491 INFO L490 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2025-04-13 19:42:53,553 INFO L143 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2025-04-13 19:42:53,580 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 48 places, 67 transitions, 141 flow [2025-04-13 19:42:53,614 INFO L116 PetriNetUnfolderBase]: 30/94 cut-off events. [2025-04-13 19:42:53,617 INFO L117 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2025-04-13 19:42:53,619 INFO L83 FinitePrefix]: Finished finitePrefix Result has 99 conditions, 94 events. 30/94 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 262 event pairs, 0 based on Foata normal form. 0/59 useless extension candidates. Maximal degree in co-relation 59. Up to 8 conditions per place. [2025-04-13 19:42:53,619 INFO L82 GeneralOperation]: Start removeDead. Operand has 48 places, 67 transitions, 141 flow [2025-04-13 19:42:53,623 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 47 places, 64 transitions, 132 flow [2025-04-13 19:42:53,632 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2025-04-13 19:42:53,640 INFO L340 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;@102ce223, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2025-04-13 19:42:53,641 INFO L341 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2025-04-13 19:42:53,646 INFO L177 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2025-04-13 19:42:53,647 INFO L116 PetriNetUnfolderBase]: 3/17 cut-off events. [2025-04-13 19:42:53,647 INFO L117 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2025-04-13 19:42:53,647 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-04-13 19:42:53,647 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2025-04-13 19:42:53,647 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2025-04-13 19:42:53,651 INFO L155 PredicateUnifier]: Initialized classic predicate unifier [2025-04-13 19:42:53,651 INFO L85 PathProgramCache]: Analyzing trace with hash 14725118, now seen corresponding path program 1 times [2025-04-13 19:42:53,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-04-13 19:42:53,657 INFO L324 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776415703] [2025-04-13 19:42:53,657 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-04-13 19:42:53,658 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-04-13 19:42:53,714 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 4 statements into 1 equivalence classes. [2025-04-13 19:42:53,737 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 4 of 4 statements. [2025-04-13 19:42:53,737 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-04-13 19:42:53,737 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is sat [2025-04-13 19:42:53,737 INFO L348 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2025-04-13 19:42:53,749 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 4 statements into 1 equivalence classes. [2025-04-13 19:42:53,760 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 4 of 4 statements. [2025-04-13 19:42:53,760 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-04-13 19:42:53,760 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is sat [2025-04-13 19:42:53,776 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2025-04-13 19:42:53,777 INFO L340 BasicCegarLoop]: Counterexample is feasible [2025-04-13 19:42:53,778 INFO L790 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2025-04-13 19:42:53,779 INFO L790 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2025-04-13 19:42:53,780 WARN L466 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2025-04-13 19:42:53,780 INFO L422 BasicCegarLoop]: Path program histogram: [1] [2025-04-13 19:42:53,783 WARN L247 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2025-04-13 19:42:53,783 INFO L490 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2025-04-13 19:42:53,804 INFO L143 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2025-04-13 19:42:53,810 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 72 places, 98 transitions, 212 flow [2025-04-13 19:42:53,836 INFO L116 PetriNetUnfolderBase]: 51/161 cut-off events. [2025-04-13 19:42:53,836 INFO L117 PetriNetUnfolderBase]: For 6/8 co-relation queries the response was YES. [2025-04-13 19:42:53,841 INFO L83 FinitePrefix]: Finished finitePrefix Result has 173 conditions, 161 events. 51/161 cut-off events. For 6/8 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 579 event pairs, 0 based on Foata normal form. 0/102 useless extension candidates. Maximal degree in co-relation 98. Up to 12 conditions per place. [2025-04-13 19:42:53,841 INFO L82 GeneralOperation]: Start removeDead. Operand has 72 places, 98 transitions, 212 flow [2025-04-13 19:42:53,843 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 72 places, 98 transitions, 212 flow [2025-04-13 19:42:53,843 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2025-04-13 19:42:53,844 INFO L340 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;@102ce223, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2025-04-13 19:42:53,844 INFO L341 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2025-04-13 19:42:53,848 INFO L177 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2025-04-13 19:42:53,848 INFO L116 PetriNetUnfolderBase]: 8/40 cut-off events. [2025-04-13 19:42:53,848 INFO L117 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2025-04-13 19:42:53,849 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-04-13 19:42:53,849 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2025-04-13 19:42:53,849 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2025-04-13 19:42:53,849 INFO L155 PredicateUnifier]: Initialized classic predicate unifier [2025-04-13 19:42:53,849 INFO L85 PathProgramCache]: Analyzing trace with hash 548381070, now seen corresponding path program 1 times [2025-04-13 19:42:53,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-04-13 19:42:53,849 INFO L324 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950832468] [2025-04-13 19:42:53,849 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-04-13 19:42:53,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-04-13 19:42:53,857 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 5 statements into 1 equivalence classes. [2025-04-13 19:42:53,857 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 5 of 5 statements. [2025-04-13 19:42:53,857 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-04-13 19:42:53,857 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-04-13 19:42:53,886 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-04-13 19:42:53,887 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-04-13 19:42:53,887 INFO L324 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950832468] [2025-04-13 19:42:53,887 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950832468] provided 1 perfect and 0 imperfect interpolant sequences [2025-04-13 19:42:53,887 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-04-13 19:42:53,887 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2025-04-13 19:42:53,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184171753] [2025-04-13 19:42:53,888 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-04-13 19:42:53,892 INFO L562 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2025-04-13 19:42:53,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-04-13 19:42:53,910 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2025-04-13 19:42:53,910 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2025-04-13 19:42:53,911 INFO L464 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 98 [2025-04-13 19:42:53,913 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 98 transitions, 212 flow. Second operand has 2 states, 2 states have (on average 12.0) internal successors, (24), 2 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-04-13 19:42:53,913 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-04-13 19:42:53,913 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 98 [2025-04-13 19:42:53,914 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-04-13 19:42:55,323 INFO L116 PetriNetUnfolderBase]: 12440/19387 cut-off events. [2025-04-13 19:42:55,323 INFO L117 PetriNetUnfolderBase]: For 97/97 co-relation queries the response was YES. [2025-04-13 19:42:55,347 INFO L83 FinitePrefix]: Finished finitePrefix Result has 38517 conditions, 19387 events. 12440/19387 cut-off events. For 97/97 co-relation queries the response was YES. Maximal size of possible extension queue 437. Compared 124065 event pairs, 11713 based on Foata normal form. 0/17846 useless extension candidates. Maximal degree in co-relation 32750. Up to 19033 conditions per place. [2025-04-13 19:42:55,410 INFO L140 encePairwiseOnDemand]: 71/98 looper letters, 52 selfloop transitions, 0 changer transitions 9/71 dead transitions. [2025-04-13 19:42:55,411 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 73 places, 71 transitions, 280 flow [2025-04-13 19:42:55,412 INFO L140 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2025-04-13 19:42:55,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2025-04-13 19:42:55,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 108 transitions. [2025-04-13 19:42:55,422 INFO L509 CegarLoopForPetriNet]: DFA transition density 0.5510204081632653 [2025-04-13 19:42:55,423 INFO L175 Difference]: Start difference. First operand has 72 places, 98 transitions, 212 flow. Second operand 2 states and 108 transitions. [2025-04-13 19:42:55,425 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 73 places, 71 transitions, 280 flow [2025-04-13 19:42:55,432 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 71 transitions, 280 flow, removed 0 selfloop flow, removed 0 redundant places. [2025-04-13 19:42:55,436 INFO L231 Difference]: Finished difference. Result has 73 places, 62 transitions, 134 flow [2025-04-13 19:42:55,437 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=98, PETRI_DIFFERENCE_MINUEND_FLOW=158, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=71, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=71, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=134, PETRI_PLACES=73, PETRI_TRANSITIONS=62} [2025-04-13 19:42:55,440 INFO L279 CegarLoopForPetriNet]: 72 programPoint places, 1 predicate places. [2025-04-13 19:42:55,441 INFO L485 AbstractCegarLoop]: Abstraction has has 73 places, 62 transitions, 134 flow [2025-04-13 19:42:55,441 INFO L486 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 12.0) internal successors, (24), 2 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-04-13 19:42:55,441 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-04-13 19:42:55,441 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2025-04-13 19:42:55,441 WARN L466 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2025-04-13 19:42:55,441 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2025-04-13 19:42:55,441 INFO L155 PredicateUnifier]: Initialized classic predicate unifier [2025-04-13 19:42:55,442 INFO L85 PathProgramCache]: Analyzing trace with hash -103027000, now seen corresponding path program 1 times [2025-04-13 19:42:55,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-04-13 19:42:55,442 INFO L324 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513879094] [2025-04-13 19:42:55,442 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-04-13 19:42:55,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-04-13 19:42:55,458 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 6 statements into 1 equivalence classes. [2025-04-13 19:42:55,474 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 6 of 6 statements. [2025-04-13 19:42:55,475 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-04-13 19:42:55,475 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is sat [2025-04-13 19:42:55,475 INFO L348 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2025-04-13 19:42:55,477 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 6 statements into 1 equivalence classes. [2025-04-13 19:42:55,486 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 6 of 6 statements. [2025-04-13 19:42:55,486 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-04-13 19:42:55,486 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is sat [2025-04-13 19:42:55,490 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2025-04-13 19:42:55,490 INFO L340 BasicCegarLoop]: Counterexample is feasible [2025-04-13 19:42:55,490 INFO L790 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2025-04-13 19:42:55,490 INFO L790 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2025-04-13 19:42:55,490 WARN L466 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2025-04-13 19:42:55,490 INFO L422 BasicCegarLoop]: Path program histogram: [1, 1] [2025-04-13 19:42:55,491 WARN L247 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2025-04-13 19:42:55,491 INFO L490 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2025-04-13 19:42:55,519 INFO L143 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2025-04-13 19:42:55,521 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 96 places, 129 transitions, 285 flow [2025-04-13 19:42:55,534 INFO L116 PetriNetUnfolderBase]: 75/237 cut-off events. [2025-04-13 19:42:55,534 INFO L117 PetriNetUnfolderBase]: For 19/25 co-relation queries the response was YES. [2025-04-13 19:42:55,536 INFO L83 FinitePrefix]: Finished finitePrefix Result has 262 conditions, 237 events. 75/237 cut-off events. For 19/25 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 991 event pairs, 1 based on Foata normal form. 0/152 useless extension candidates. Maximal degree in co-relation 172. Up to 16 conditions per place. [2025-04-13 19:42:55,536 INFO L82 GeneralOperation]: Start removeDead. Operand has 96 places, 129 transitions, 285 flow [2025-04-13 19:42:55,539 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 96 places, 129 transitions, 285 flow [2025-04-13 19:42:55,539 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2025-04-13 19:42:55,540 INFO L340 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;@102ce223, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2025-04-13 19:42:55,540 INFO L341 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2025-04-13 19:42:55,542 INFO L177 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2025-04-13 19:42:55,542 INFO L116 PetriNetUnfolderBase]: 8/40 cut-off events. [2025-04-13 19:42:55,542 INFO L117 PetriNetUnfolderBase]: For 4/4 co-relation queries the response was YES. [2025-04-13 19:42:55,542 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-04-13 19:42:55,542 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2025-04-13 19:42:55,542 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2025-04-13 19:42:55,542 INFO L155 PredicateUnifier]: Initialized classic predicate unifier [2025-04-13 19:42:55,542 INFO L85 PathProgramCache]: Analyzing trace with hash 671486415, now seen corresponding path program 1 times [2025-04-13 19:42:55,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-04-13 19:42:55,543 INFO L324 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121746351] [2025-04-13 19:42:55,543 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-04-13 19:42:55,543 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-04-13 19:42:55,552 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 5 statements into 1 equivalence classes. [2025-04-13 19:42:55,552 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 5 of 5 statements. [2025-04-13 19:42:55,552 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-04-13 19:42:55,553 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-04-13 19:42:55,566 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-04-13 19:42:55,566 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-04-13 19:42:55,566 INFO L324 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121746351] [2025-04-13 19:42:55,566 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121746351] provided 1 perfect and 0 imperfect interpolant sequences [2025-04-13 19:42:55,566 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-04-13 19:42:55,567 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2025-04-13 19:42:55,567 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939189969] [2025-04-13 19:42:55,567 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-04-13 19:42:55,567 INFO L562 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2025-04-13 19:42:55,567 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-04-13 19:42:55,567 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2025-04-13 19:42:55,567 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2025-04-13 19:42:55,567 INFO L464 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 129 [2025-04-13 19:42:55,568 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 96 places, 129 transitions, 285 flow. Second operand has 2 states, 2 states have (on average 16.0) internal successors, (32), 2 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-04-13 19:42:55,568 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-04-13 19:42:55,568 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 129 [2025-04-13 19:42:55,568 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-04-13 19:43:16,037 INFO L116 PetriNetUnfolderBase]: 344973/469107 cut-off events. [2025-04-13 19:43:16,037 INFO L117 PetriNetUnfolderBase]: For 3413/3413 co-relation queries the response was YES. [2025-04-13 19:43:16,618 INFO L83 FinitePrefix]: Finished finitePrefix Result has 936566 conditions, 469107 events. 344973/469107 cut-off events. For 3413/3413 co-relation queries the response was YES. Maximal size of possible extension queue 7563. Compared 3411650 event pairs, 325126 based on Foata normal form. 0/434950 useless extension candidates. Maximal degree in co-relation 704813. Up to 465020 conditions per place. [2025-04-13 19:43:18,110 INFO L140 encePairwiseOnDemand]: 95/129 looper letters, 71 selfloop transitions, 0 changer transitions 10/95 dead transitions. [2025-04-13 19:43:18,110 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 97 places, 95 transitions, 379 flow [2025-04-13 19:43:18,113 INFO L140 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2025-04-13 19:43:18,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2025-04-13 19:43:18,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 143 transitions. [2025-04-13 19:43:18,114 INFO L509 CegarLoopForPetriNet]: DFA transition density 0.5542635658914729 [2025-04-13 19:43:18,114 INFO L175 Difference]: Start difference. First operand has 96 places, 129 transitions, 285 flow. Second operand 2 states and 143 transitions. [2025-04-13 19:43:18,114 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 97 places, 95 transitions, 379 flow [2025-04-13 19:43:18,142 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 97 places, 95 transitions, 379 flow, removed 0 selfloop flow, removed 0 redundant places. [2025-04-13 19:43:18,144 INFO L231 Difference]: Finished difference. Result has 97 places, 85 transitions, 188 flow [2025-04-13 19:43:18,144 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=129, PETRI_DIFFERENCE_MINUEND_FLOW=217, PETRI_DIFFERENCE_MINUEND_PLACES=96, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=95, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=95, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=188, PETRI_PLACES=97, PETRI_TRANSITIONS=85} [2025-04-13 19:43:18,145 INFO L279 CegarLoopForPetriNet]: 96 programPoint places, 1 predicate places. [2025-04-13 19:43:18,150 INFO L485 AbstractCegarLoop]: Abstraction has has 97 places, 85 transitions, 188 flow [2025-04-13 19:43:18,150 INFO L486 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 16.0) internal successors, (32), 2 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-04-13 19:43:18,150 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-04-13 19:43:18,150 INFO L206 CegarLoopForPetriNet]: trace histogram [3, 1, 1, 1, 1, 1] [2025-04-13 19:43:18,150 WARN L466 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2025-04-13 19:43:18,150 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2025-04-13 19:43:18,151 INFO L155 PredicateUnifier]: Initialized classic predicate unifier [2025-04-13 19:43:18,151 INFO L85 PathProgramCache]: Analyzing trace with hash -700676787, now seen corresponding path program 1 times [2025-04-13 19:43:18,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-04-13 19:43:18,151 INFO L324 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181952284] [2025-04-13 19:43:18,151 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-04-13 19:43:18,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-04-13 19:43:18,170 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 8 statements into 1 equivalence classes. [2025-04-13 19:43:18,192 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 8 of 8 statements. [2025-04-13 19:43:18,193 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-04-13 19:43:18,193 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is sat [2025-04-13 19:43:18,193 INFO L348 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2025-04-13 19:43:18,200 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 8 statements into 1 equivalence classes. [2025-04-13 19:43:18,225 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 8 of 8 statements. [2025-04-13 19:43:18,228 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-04-13 19:43:18,229 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is sat [2025-04-13 19:43:18,241 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2025-04-13 19:43:18,241 INFO L340 BasicCegarLoop]: Counterexample is feasible [2025-04-13 19:43:18,241 INFO L790 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2025-04-13 19:43:18,241 INFO L790 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2025-04-13 19:43:18,242 WARN L466 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2025-04-13 19:43:18,242 INFO L422 BasicCegarLoop]: Path program histogram: [1, 1] [2025-04-13 19:43:18,242 WARN L247 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2025-04-13 19:43:18,242 INFO L490 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2025-04-13 19:43:18,277 INFO L143 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2025-04-13 19:43:18,281 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 120 places, 160 transitions, 360 flow [2025-04-13 19:43:18,307 INFO L116 PetriNetUnfolderBase]: 107/333 cut-off events. [2025-04-13 19:43:18,307 INFO L117 PetriNetUnfolderBase]: For 48/60 co-relation queries the response was YES. [2025-04-13 19:43:18,309 INFO L83 FinitePrefix]: Finished finitePrefix Result has 384 conditions, 333 events. 107/333 cut-off events. For 48/60 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 1482 event pairs, 6 based on Foata normal form. 0/218 useless extension candidates. Maximal degree in co-relation 261. Up to 32 conditions per place. [2025-04-13 19:43:18,309 INFO L82 GeneralOperation]: Start removeDead. Operand has 120 places, 160 transitions, 360 flow [2025-04-13 19:43:18,312 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 120 places, 160 transitions, 360 flow [2025-04-13 19:43:18,312 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2025-04-13 19:43:18,313 INFO L340 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;@102ce223, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2025-04-13 19:43:18,313 INFO L341 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2025-04-13 19:43:18,317 INFO L177 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2025-04-13 19:43:18,317 INFO L116 PetriNetUnfolderBase]: 8/40 cut-off events. [2025-04-13 19:43:18,317 INFO L117 PetriNetUnfolderBase]: For 4/4 co-relation queries the response was YES. [2025-04-13 19:43:18,317 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-04-13 19:43:18,317 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2025-04-13 19:43:18,318 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2025-04-13 19:43:18,318 INFO L155 PredicateUnifier]: Initialized classic predicate unifier [2025-04-13 19:43:18,318 INFO L85 PathProgramCache]: Analyzing trace with hash 824175215, now seen corresponding path program 1 times [2025-04-13 19:43:18,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-04-13 19:43:18,318 INFO L324 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081629771] [2025-04-13 19:43:18,318 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-04-13 19:43:18,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-04-13 19:43:18,329 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 5 statements into 1 equivalence classes. [2025-04-13 19:43:18,330 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 5 of 5 statements. [2025-04-13 19:43:18,330 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-04-13 19:43:18,330 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-04-13 19:43:18,335 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-04-13 19:43:18,339 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-04-13 19:43:18,339 INFO L324 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081629771] [2025-04-13 19:43:18,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2081629771] provided 1 perfect and 0 imperfect interpolant sequences [2025-04-13 19:43:18,339 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-04-13 19:43:18,339 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2025-04-13 19:43:18,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281560224] [2025-04-13 19:43:18,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-04-13 19:43:18,340 INFO L562 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2025-04-13 19:43:18,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-04-13 19:43:18,340 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2025-04-13 19:43:18,340 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2025-04-13 19:43:18,340 INFO L464 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 160 [2025-04-13 19:43:18,340 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 120 places, 160 transitions, 360 flow. Second operand has 2 states, 2 states have (on average 20.0) internal successors, (40), 2 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-04-13 19:43:18,341 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-04-13 19:43:18,341 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 160 [2025-04-13 19:43:18,341 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand