./Ultimate.py --spec /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/properties/valid-memsafety.prp --file /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-ext/35_double_lock_p3_vs.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) 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/AutomizerMemDerefMemtrack.xml -i /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-ext/35_double_lock_p3_vs.i -s /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-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 valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6710ae2bfe9a41273181e1b4b9dbdfa98f0dea6daffb771915892955eccb69dd --- Real Ultimate output --- This is Ultimate 0.2.5-dev-84cfde4 [2024-10-11 19:28:58,469 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-10-11 19:28:58,507 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2024-10-11 19:28:58,511 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-10-11 19:28:58,511 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-10-11 19:28:58,537 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-10-11 19:28:58,538 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-10-11 19:28:58,538 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-10-11 19:28:58,539 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-10-11 19:28:58,540 INFO L153 SettingsManager]: * Use memory slicer=true [2024-10-11 19:28:58,540 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-10-11 19:28:58,541 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-10-11 19:28:58,541 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-10-11 19:28:58,541 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-10-11 19:28:58,543 INFO L153 SettingsManager]: * Use SBE=true [2024-10-11 19:28:58,543 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-10-11 19:28:58,544 INFO L153 SettingsManager]: * sizeof long=4 [2024-10-11 19:28:58,544 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-10-11 19:28:58,544 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-10-11 19:28:58,544 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-10-11 19:28:58,544 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2024-10-11 19:28:58,545 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2024-10-11 19:28:58,548 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2024-10-11 19:28:58,549 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-10-11 19:28:58,549 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2024-10-11 19:28:58,549 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-10-11 19:28:58,549 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2024-10-11 19:28:58,549 INFO L153 SettingsManager]: * sizeof long double=12 [2024-10-11 19:28:58,550 INFO L153 SettingsManager]: * Use constant arrays=true [2024-10-11 19:28:58,550 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-10-11 19:28:58,550 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-10-11 19:28:58,550 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-10-11 19:28:58,550 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-10-11 19:28:58,550 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-11 19:28:58,551 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-10-11 19:28:58,551 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-10-11 19:28:58,551 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-10-11 19:28:58,551 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-10-11 19:28:58,551 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-10-11 19:28:58,551 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-10-11 19:28:58,552 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-10-11 19:28:58,552 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-10-11 19:28:58,552 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6710ae2bfe9a41273181e1b4b9dbdfa98f0dea6daffb771915892955eccb69dd [2024-10-11 19:28:58,785 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-10-11 19:28:58,805 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-10-11 19:28:58,809 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-10-11 19:28:58,810 INFO L270 PluginConnector]: Initializing CDTParser... [2024-10-11 19:28:58,810 INFO L274 PluginConnector]: CDTParser initialized [2024-10-11 19:28:58,812 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-ext/35_double_lock_p3_vs.i [2024-10-11 19:29:00,215 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-10-11 19:29:00,491 INFO L384 CDTParser]: Found 1 translation units. [2024-10-11 19:29:00,492 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-ext/35_double_lock_p3_vs.i [2024-10-11 19:29:00,503 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/data/11e98bffb/6195a394f0b448e4b9c21505bbba3238/FLAG8b0feed4f [2024-10-11 19:29:00,515 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/data/11e98bffb/6195a394f0b448e4b9c21505bbba3238 [2024-10-11 19:29:00,518 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-10-11 19:29:00,519 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-10-11 19:29:00,520 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-10-11 19:29:00,522 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-10-11 19:29:00,527 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-10-11 19:29:00,528 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:00,529 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40b15cc0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00, skipping insertion in model container [2024-10-11 19:29:00,529 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:00,566 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-10-11 19:29:00,818 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-11 19:29:00,826 INFO L200 MainTranslator]: Completed pre-run [2024-10-11 19:29:00,898 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-11 19:29:00,927 INFO L204 MainTranslator]: Completed translation [2024-10-11 19:29:00,928 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00 WrapperNode [2024-10-11 19:29:00,928 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-10-11 19:29:00,929 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-10-11 19:29:00,929 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-10-11 19:29:00,929 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-10-11 19:29:00,956 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:00,966 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:00,983 INFO L138 Inliner]: procedures = 171, calls = 24, calls flagged for inlining = 12, calls inlined = 16, statements flattened = 125 [2024-10-11 19:29:00,983 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-10-11 19:29:00,984 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-10-11 19:29:00,984 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-10-11 19:29:00,984 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-10-11 19:29:00,992 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:00,992 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:00,995 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:01,006 INFO L175 MemorySlicer]: Split 15 memory accesses to 2 slices as follows [2, 13]. 87 percent of accesses are in the largest equivalence class. The 3 initializations are split as follows [2, 1]. The 6 writes are split as follows [0, 6]. [2024-10-11 19:29:01,007 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:01,007 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:01,011 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:01,013 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:01,015 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:01,016 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:01,017 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-10-11 19:29:01,018 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-10-11 19:29:01,018 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-10-11 19:29:01,018 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-10-11 19:29:01,019 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (1/1) ... [2024-10-11 19:29:01,027 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-11 19:29:01,035 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-clean/releaseScripts/default/UAutomizer-linux/z3 [2024-10-11 19:29:01,051 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 19:29:01,053 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 19:29:01,126 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2024-10-11 19:29:01,126 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2024-10-11 19:29:01,126 INFO L130 BoogieDeclarations]: Found specification of procedure thr2 [2024-10-11 19:29:01,126 INFO L138 BoogieDeclarations]: Found implementation of procedure thr2 [2024-10-11 19:29:01,126 INFO L130 BoogieDeclarations]: Found specification of procedure thr1 [2024-10-11 19:29:01,126 INFO L138 BoogieDeclarations]: Found implementation of procedure thr1 [2024-10-11 19:29:01,126 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2024-10-11 19:29:01,127 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2024-10-11 19:29:01,127 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-10-11 19:29:01,127 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-10-11 19:29:01,127 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2024-10-11 19:29:01,128 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-10-11 19:29:01,128 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-10-11 19:29:01,129 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 19:29:01,238 INFO L238 CfgBuilder]: Building ICFG [2024-10-11 19:29:01,239 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-10-11 19:29:01,520 INFO L283 CfgBuilder]: Omitted future-live optimization because the input is a concurrent program. [2024-10-11 19:29:01,521 INFO L287 CfgBuilder]: Performing block encoding [2024-10-11 19:29:01,697 INFO L309 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-10-11 19:29:01,697 INFO L314 CfgBuilder]: Removed 2 assume(true) statements. [2024-10-11 19:29:01,698 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 07:29:01 BoogieIcfgContainer [2024-10-11 19:29:01,698 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-10-11 19:29:01,699 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-10-11 19:29:01,699 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-10-11 19:29:01,702 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-10-11 19:29:01,702 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.10 07:29:00" (1/3) ... [2024-10-11 19:29:01,703 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20d3fa6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 07:29:01, skipping insertion in model container [2024-10-11 19:29:01,703 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 07:29:00" (2/3) ... [2024-10-11 19:29:01,703 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20d3fa6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 07:29:01, skipping insertion in model container [2024-10-11 19:29:01,703 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 07:29:01" (3/3) ... [2024-10-11 19:29:01,704 INFO L112 eAbstractionObserver]: Analyzing ICFG 35_double_lock_p3_vs.i [2024-10-11 19:29:01,717 INFO L209 ceAbstractionStarter]: Automizer settings: Hoare:None NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-10-11 19:29:01,718 INFO L149 ceAbstractionStarter]: Applying trace abstraction to program that has 26 error locations. [2024-10-11 19:29:01,718 INFO L484 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2024-10-11 19:29:01,757 INFO L143 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2024-10-11 19:29:01,782 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 60 places, 58 transitions, 124 flow [2024-10-11 19:29:01,852 INFO L124 PetriNetUnfolderBase]: 4/61 cut-off events. [2024-10-11 19:29:01,853 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-11 19:29:01,860 INFO L83 FinitePrefix]: Finished finitePrefix Result has 68 conditions, 61 events. 4/61 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 205 event pairs, 0 based on Foata normal form. 0/28 useless extension candidates. Maximal degree in co-relation 61. Up to 2 conditions per place. [2024-10-11 19:29:01,862 INFO L82 GeneralOperation]: Start removeDead. Operand has 60 places, 58 transitions, 124 flow [2024-10-11 19:29:01,867 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 59 places, 57 transitions, 121 flow [2024-10-11 19:29:01,880 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-10-11 19:29:01,890 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=None, 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;@367b6043, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-10-11 19:29:01,890 INFO L334 AbstractCegarLoop]: Starting to check reachability of 53 error locations. [2024-10-11 19:29:01,893 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2024-10-11 19:29:01,893 INFO L124 PetriNetUnfolderBase]: 0/8 cut-off events. [2024-10-11 19:29:01,893 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-11 19:29:01,893 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 19:29:01,894 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2024-10-11 19:29:01,894 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2024-10-11 19:29:01,898 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 19:29:01,898 INFO L85 PathProgramCache]: Analyzing trace with hash 462568846, now seen corresponding path program 1 times [2024-10-11 19:29:01,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 19:29:01,907 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279707296] [2024-10-11 19:29:01,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 19:29:01,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 19:29:01,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 19:29:02,098 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 19:29:02,099 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 19:29:02,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279707296] [2024-10-11 19:29:02,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279707296] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 19:29:02,103 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 19:29:02,103 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-10-11 19:29:02,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426909933] [2024-10-11 19:29:02,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 19:29:02,120 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-11 19:29:02,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 19:29:02,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-11 19:29:02,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-11 19:29:02,157 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 9 out of 58 [2024-10-11 19:29:02,159 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 57 transitions, 121 flow. Second operand has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 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 19:29:02,159 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 19:29:02,159 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 9 of 58 [2024-10-11 19:29:02,160 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-10-11 19:29:02,324 INFO L124 PetriNetUnfolderBase]: 515/832 cut-off events. [2024-10-11 19:29:02,324 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2024-10-11 19:29:02,327 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1635 conditions, 832 events. 515/832 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 71. Compared 4045 event pairs, 402 based on Foata normal form. 189/786 useless extension candidates. Maximal degree in co-relation 1625. Up to 785 conditions per place. [2024-10-11 19:29:02,336 INFO L140 encePairwiseOnDemand]: 35/58 looper letters, 24 selfloop transitions, 1 changer transitions 0/32 dead transitions. [2024-10-11 19:29:02,336 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 38 places, 32 transitions, 121 flow [2024-10-11 19:29:02,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-11 19:29:02,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-10-11 19:29:02,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 74 transitions. [2024-10-11 19:29:02,346 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.42528735632183906 [2024-10-11 19:29:02,347 INFO L175 Difference]: Start difference. First operand has 59 places, 57 transitions, 121 flow. Second operand 3 states and 74 transitions. [2024-10-11 19:29:02,348 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 38 places, 32 transitions, 121 flow [2024-10-11 19:29:02,350 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 32 transitions, 120 flow, removed 0 selfloop flow, removed 1 redundant places. [2024-10-11 19:29:02,352 INFO L231 Difference]: Finished difference. Result has 37 places, 32 transitions, 72 flow [2024-10-11 19:29:02,354 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=58, PETRI_DIFFERENCE_MINUEND_FLOW=70, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=32, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=72, PETRI_PLACES=37, PETRI_TRANSITIONS=32} [2024-10-11 19:29:02,358 INFO L277 CegarLoopForPetriNet]: 59 programPoint places, -22 predicate places. [2024-10-11 19:29:02,358 INFO L471 AbstractCegarLoop]: Abstraction has has 37 places, 32 transitions, 72 flow [2024-10-11 19:29:02,358 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 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 19:29:02,359 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 19:29:02,359 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2024-10-11 19:29:02,359 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-10-11 19:29:02,359 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2024-10-11 19:29:02,360 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 19:29:02,361 INFO L85 PathProgramCache]: Analyzing trace with hash 462568847, now seen corresponding path program 1 times [2024-10-11 19:29:02,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 19:29:02,362 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172151446] [2024-10-11 19:29:02,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 19:29:02,362 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 19:29:02,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 19:29:02,482 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 19:29:02,482 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 19:29:02,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172151446] [2024-10-11 19:29:02,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172151446] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 19:29:02,483 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 19:29:02,483 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-10-11 19:29:02,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494996919] [2024-10-11 19:29:02,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 19:29:02,485 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-11 19:29:02,485 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 19:29:02,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-11 19:29:02,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-11 19:29:02,486 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 9 out of 58 [2024-10-11 19:29:02,486 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 32 transitions, 72 flow. Second operand has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 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 19:29:02,486 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 19:29:02,486 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 9 of 58 [2024-10-11 19:29:02,486 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-10-11 19:29:02,552 INFO L124 PetriNetUnfolderBase]: 232/401 cut-off events. [2024-10-11 19:29:02,553 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2024-10-11 19:29:02,554 INFO L83 FinitePrefix]: Finished finitePrefix Result has 780 conditions, 401 events. 232/401 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 33. Compared 1638 event pairs, 184 based on Foata normal form. 0/387 useless extension candidates. Maximal degree in co-relation 773. Up to 364 conditions per place. [2024-10-11 19:29:02,556 INFO L140 encePairwiseOnDemand]: 51/58 looper letters, 18 selfloop transitions, 1 changer transitions 0/26 dead transitions. [2024-10-11 19:29:02,556 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 26 transitions, 98 flow [2024-10-11 19:29:02,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-11 19:29:02,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-10-11 19:29:02,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 52 transitions. [2024-10-11 19:29:02,557 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.2988505747126437 [2024-10-11 19:29:02,557 INFO L175 Difference]: Start difference. First operand has 37 places, 32 transitions, 72 flow. Second operand 3 states and 52 transitions. [2024-10-11 19:29:02,557 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 26 transitions, 98 flow [2024-10-11 19:29:02,558 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 32 places, 26 transitions, 97 flow, removed 0 selfloop flow, removed 1 redundant places. [2024-10-11 19:29:02,558 INFO L231 Difference]: Finished difference. Result has 32 places, 26 transitions, 61 flow [2024-10-11 19:29:02,559 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=58, PETRI_DIFFERENCE_MINUEND_FLOW=59, PETRI_DIFFERENCE_MINUEND_PLACES=30, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=61, PETRI_PLACES=32, PETRI_TRANSITIONS=26} [2024-10-11 19:29:02,559 INFO L277 CegarLoopForPetriNet]: 59 programPoint places, -27 predicate places. [2024-10-11 19:29:02,559 INFO L471 AbstractCegarLoop]: Abstraction has has 32 places, 26 transitions, 61 flow [2024-10-11 19:29:02,560 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 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 19:29:02,560 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 19:29:02,560 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2024-10-11 19:29:02,560 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-10-11 19:29:02,560 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err4ASSERT_VIOLATIONMEMORY_LEAK === [thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2024-10-11 19:29:02,561 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 19:29:02,561 INFO L85 PathProgramCache]: Analyzing trace with hash 2134044347, now seen corresponding path program 1 times [2024-10-11 19:29:02,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 19:29:02,561 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483220003] [2024-10-11 19:29:02,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 19:29:02,561 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 19:29:02,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 19:29:02,600 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 19:29:02,600 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 19:29:02,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483220003] [2024-10-11 19:29:02,601 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [483220003] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 19:29:02,601 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 19:29:02,601 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-11 19:29:02,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488703083] [2024-10-11 19:29:02,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 19:29:02,602 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-11 19:29:02,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 19:29:02,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-11 19:29:02,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-11 19:29:02,604 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 9 out of 58 [2024-10-11 19:29:02,605 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 32 places, 26 transitions, 61 flow. Second operand has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 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 19:29:02,605 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 19:29:02,605 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 9 of 58 [2024-10-11 19:29:02,605 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-10-11 19:29:02,653 INFO L124 PetriNetUnfolderBase]: 174/297 cut-off events. [2024-10-11 19:29:02,654 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2024-10-11 19:29:02,654 INFO L83 FinitePrefix]: Finished finitePrefix Result has 584 conditions, 297 events. 174/297 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 27. Compared 1151 event pairs, 129 based on Foata normal form. 36/322 useless extension candidates. Maximal degree in co-relation 576. Up to 273 conditions per place. [2024-10-11 19:29:02,656 INFO L140 encePairwiseOnDemand]: 56/58 looper letters, 17 selfloop transitions, 1 changer transitions 0/23 dead transitions. [2024-10-11 19:29:02,656 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 23 transitions, 91 flow [2024-10-11 19:29:02,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-11 19:29:02,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-10-11 19:29:02,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 46 transitions. [2024-10-11 19:29:02,657 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.26436781609195403 [2024-10-11 19:29:02,657 INFO L175 Difference]: Start difference. First operand has 32 places, 26 transitions, 61 flow. Second operand 3 states and 46 transitions. [2024-10-11 19:29:02,658 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 23 transitions, 91 flow [2024-10-11 19:29:02,658 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 23 transitions, 90 flow, removed 0 selfloop flow, removed 1 redundant places. [2024-10-11 19:29:02,658 INFO L231 Difference]: Finished difference. Result has 30 places, 23 transitions, 56 flow [2024-10-11 19:29:02,659 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=58, PETRI_DIFFERENCE_MINUEND_FLOW=54, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=23, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=56, PETRI_PLACES=30, PETRI_TRANSITIONS=23} [2024-10-11 19:29:02,659 INFO L277 CegarLoopForPetriNet]: 59 programPoint places, -29 predicate places. [2024-10-11 19:29:02,659 INFO L471 AbstractCegarLoop]: Abstraction has has 30 places, 23 transitions, 56 flow [2024-10-11 19:29:02,660 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 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 19:29:02,660 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 19:29:02,660 INFO L204 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2024-10-11 19:29:02,660 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2024-10-11 19:29:02,660 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2024-10-11 19:29:02,661 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 19:29:02,661 INFO L85 PathProgramCache]: Analyzing trace with hash 277186354, now seen corresponding path program 1 times [2024-10-11 19:29:02,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 19:29:02,661 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479696435] [2024-10-11 19:29:02,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 19:29:02,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 19:29:02,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-10-11 19:29:02,674 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2024-10-11 19:29:02,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-10-11 19:29:02,704 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2024-10-11 19:29:02,704 INFO L325 BasicCegarLoop]: Counterexample is feasible [2024-10-11 19:29:02,705 INFO L782 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (52 of 53 remaining) [2024-10-11 19:29:02,707 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (51 of 53 remaining) [2024-10-11 19:29:02,707 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (50 of 53 remaining) [2024-10-11 19:29:02,707 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (49 of 53 remaining) [2024-10-11 19:29:02,707 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (48 of 53 remaining) [2024-10-11 19:29:02,708 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (47 of 53 remaining) [2024-10-11 19:29:02,708 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (46 of 53 remaining) [2024-10-11 19:29:02,708 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (45 of 53 remaining) [2024-10-11 19:29:02,708 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (44 of 53 remaining) [2024-10-11 19:29:02,708 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (43 of 53 remaining) [2024-10-11 19:29:02,708 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err9REQUIRES_VIOLATIONMEMORY_DEREFERENCE (42 of 53 remaining) [2024-10-11 19:29:02,708 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err10REQUIRES_VIOLATIONMEMORY_DEREFERENCE (41 of 53 remaining) [2024-10-11 19:29:02,709 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err11REQUIRES_VIOLATIONMEMORY_DEREFERENCE (40 of 53 remaining) [2024-10-11 19:29:02,709 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err12REQUIRES_VIOLATIONMEMORY_DEREFERENCE (39 of 53 remaining) [2024-10-11 19:29:02,709 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err13REQUIRES_VIOLATIONMEMORY_DEREFERENCE (38 of 53 remaining) [2024-10-11 19:29:02,709 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err14REQUIRES_VIOLATIONMEMORY_DEREFERENCE (37 of 53 remaining) [2024-10-11 19:29:02,709 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err15REQUIRES_VIOLATIONMEMORY_DEREFERENCE (36 of 53 remaining) [2024-10-11 19:29:02,709 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (35 of 53 remaining) [2024-10-11 19:29:02,710 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (34 of 53 remaining) [2024-10-11 19:29:02,710 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (33 of 53 remaining) [2024-10-11 19:29:02,710 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (32 of 53 remaining) [2024-10-11 19:29:02,710 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (31 of 53 remaining) [2024-10-11 19:29:02,710 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (30 of 53 remaining) [2024-10-11 19:29:02,711 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (29 of 53 remaining) [2024-10-11 19:29:02,711 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (28 of 53 remaining) [2024-10-11 19:29:02,711 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err4ASSERT_VIOLATIONMEMORY_LEAK (27 of 53 remaining) [2024-10-11 19:29:02,711 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONMEMORY_LEAK (26 of 53 remaining) [2024-10-11 19:29:02,711 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (25 of 53 remaining) [2024-10-11 19:29:02,712 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (24 of 53 remaining) [2024-10-11 19:29:02,712 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 53 remaining) [2024-10-11 19:29:02,712 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 53 remaining) [2024-10-11 19:29:02,712 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 53 remaining) [2024-10-11 19:29:02,712 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 53 remaining) [2024-10-11 19:29:02,713 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 53 remaining) [2024-10-11 19:29:02,713 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 53 remaining) [2024-10-11 19:29:02,713 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 53 remaining) [2024-10-11 19:29:02,713 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 53 remaining) [2024-10-11 19:29:02,713 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err9REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 53 remaining) [2024-10-11 19:29:02,714 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err10REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 53 remaining) [2024-10-11 19:29:02,714 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err11REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 53 remaining) [2024-10-11 19:29:02,714 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err12REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 53 remaining) [2024-10-11 19:29:02,714 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err13REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 53 remaining) [2024-10-11 19:29:02,714 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err14REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 53 remaining) [2024-10-11 19:29:02,715 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err15REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 53 remaining) [2024-10-11 19:29:02,715 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 53 remaining) [2024-10-11 19:29:02,715 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 53 remaining) [2024-10-11 19:29:02,715 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 53 remaining) [2024-10-11 19:29:02,715 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 53 remaining) [2024-10-11 19:29:02,716 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 53 remaining) [2024-10-11 19:29:02,716 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 53 remaining) [2024-10-11 19:29:02,716 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 53 remaining) [2024-10-11 19:29:02,716 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 53 remaining) [2024-10-11 19:29:02,716 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err4ASSERT_VIOLATIONMEMORY_LEAK (0 of 53 remaining) [2024-10-11 19:29:02,717 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2024-10-11 19:29:02,717 INFO L407 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2024-10-11 19:29:02,719 WARN L239 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2024-10-11 19:29:02,719 INFO L484 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2024-10-11 19:29:02,765 INFO L143 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2024-10-11 19:29:02,767 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 109 places, 107 transitions, 234 flow [2024-10-11 19:29:02,789 INFO L124 PetriNetUnfolderBase]: 5/94 cut-off events. [2024-10-11 19:29:02,789 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2024-10-11 19:29:02,794 INFO L83 FinitePrefix]: Finished finitePrefix Result has 106 conditions, 94 events. 5/94 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 393 event pairs, 0 based on Foata normal form. 0/42 useless extension candidates. Maximal degree in co-relation 101. Up to 3 conditions per place. [2024-10-11 19:29:02,794 INFO L82 GeneralOperation]: Start removeDead. Operand has 109 places, 107 transitions, 234 flow [2024-10-11 19:29:02,800 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 88 places, 85 transitions, 183 flow [2024-10-11 19:29:02,802 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-10-11 19:29:02,802 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=None, 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;@367b6043, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-10-11 19:29:02,802 INFO L334 AbstractCegarLoop]: Starting to check reachability of 78 error locations. [2024-10-11 19:29:02,809 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2024-10-11 19:29:02,810 INFO L124 PetriNetUnfolderBase]: 0/8 cut-off events. [2024-10-11 19:29:02,810 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-11 19:29:02,810 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 19:29:02,810 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2024-10-11 19:29:02,810 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 75 more)] === [2024-10-11 19:29:02,811 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 19:29:02,811 INFO L85 PathProgramCache]: Analyzing trace with hash 566136260, now seen corresponding path program 1 times [2024-10-11 19:29:02,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 19:29:02,811 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496194409] [2024-10-11 19:29:02,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 19:29:02,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 19:29:02,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 19:29:02,878 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 19:29:02,878 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 19:29:02,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496194409] [2024-10-11 19:29:02,879 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496194409] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 19:29:02,880 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 19:29:02,880 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-10-11 19:29:02,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842003839] [2024-10-11 19:29:02,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 19:29:02,881 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-11 19:29:02,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 19:29:02,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-11 19:29:02,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-11 19:29:02,886 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 15 out of 107 [2024-10-11 19:29:02,886 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 88 places, 85 transitions, 183 flow. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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 19:29:02,886 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 19:29:02,886 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 15 of 107 [2024-10-11 19:29:02,886 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-10-11 19:29:04,595 INFO L124 PetriNetUnfolderBase]: 11990/16387 cut-off events. [2024-10-11 19:29:04,596 INFO L125 PetriNetUnfolderBase]: For 280/280 co-relation queries the response was YES. [2024-10-11 19:29:04,632 INFO L83 FinitePrefix]: Finished finitePrefix Result has 32536 conditions, 16387 events. 11990/16387 cut-off events. For 280/280 co-relation queries the response was YES. Maximal size of possible extension queue 806. Compared 93397 event pairs, 10077 based on Foata normal form. 2884/14310 useless extension candidates. Maximal degree in co-relation 32525. Up to 15860 conditions per place. [2024-10-11 19:29:04,729 INFO L140 encePairwiseOnDemand]: 72/107 looper letters, 39 selfloop transitions, 1 changer transitions 0/48 dead transitions. [2024-10-11 19:29:04,730 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 48 transitions, 189 flow [2024-10-11 19:29:04,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-11 19:29:04,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-10-11 19:29:04,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 119 transitions. [2024-10-11 19:29:04,734 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.3707165109034268 [2024-10-11 19:29:04,734 INFO L175 Difference]: Start difference. First operand has 88 places, 85 transitions, 183 flow. Second operand 3 states and 119 transitions. [2024-10-11 19:29:04,734 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 48 transitions, 189 flow [2024-10-11 19:29:04,736 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 48 transitions, 188 flow, removed 0 selfloop flow, removed 1 redundant places. [2024-10-11 19:29:04,737 INFO L231 Difference]: Finished difference. Result has 54 places, 48 transitions, 110 flow [2024-10-11 19:29:04,737 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=107, PETRI_DIFFERENCE_MINUEND_FLOW=108, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=48, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=47, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=110, PETRI_PLACES=54, PETRI_TRANSITIONS=48} [2024-10-11 19:29:04,738 INFO L277 CegarLoopForPetriNet]: 88 programPoint places, -34 predicate places. [2024-10-11 19:29:04,738 INFO L471 AbstractCegarLoop]: Abstraction has has 54 places, 48 transitions, 110 flow [2024-10-11 19:29:04,738 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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 19:29:04,738 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 19:29:04,738 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2024-10-11 19:29:04,739 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2024-10-11 19:29:04,739 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 75 more)] === [2024-10-11 19:29:04,739 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 19:29:04,739 INFO L85 PathProgramCache]: Analyzing trace with hash 566136261, now seen corresponding path program 1 times [2024-10-11 19:29:04,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 19:29:04,740 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049397223] [2024-10-11 19:29:04,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 19:29:04,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 19:29:04,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 19:29:04,803 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 19:29:04,803 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 19:29:04,803 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049397223] [2024-10-11 19:29:04,803 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2049397223] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 19:29:04,804 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 19:29:04,804 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-10-11 19:29:04,804 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95585291] [2024-10-11 19:29:04,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 19:29:04,804 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-11 19:29:04,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 19:29:04,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-11 19:29:04,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-11 19:29:04,806 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 15 out of 107 [2024-10-11 19:29:04,806 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 48 transitions, 110 flow. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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 19:29:04,806 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 19:29:04,806 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 15 of 107 [2024-10-11 19:29:04,806 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-10-11 19:29:05,205 INFO L124 PetriNetUnfolderBase]: 4112/5759 cut-off events. [2024-10-11 19:29:05,206 INFO L125 PetriNetUnfolderBase]: For 142/142 co-relation queries the response was YES. [2024-10-11 19:29:05,213 INFO L83 FinitePrefix]: Finished finitePrefix Result has 11375 conditions, 5759 events. 4112/5759 cut-off events. For 142/142 co-relation queries the response was YES. Maximal size of possible extension queue 254. Compared 28388 event pairs, 3473 based on Foata normal form. 0/5480 useless extension candidates. Maximal degree in co-relation 11367. Up to 5468 conditions per place. [2024-10-11 19:29:05,233 INFO L140 encePairwiseOnDemand]: 96/107 looper letters, 29 selfloop transitions, 1 changer transitions 0/38 dead transitions. [2024-10-11 19:29:05,234 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 46 places, 38 transitions, 150 flow [2024-10-11 19:29:05,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-11 19:29:05,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-10-11 19:29:05,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 85 transitions. [2024-10-11 19:29:05,235 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.26479750778816197 [2024-10-11 19:29:05,235 INFO L175 Difference]: Start difference. First operand has 54 places, 48 transitions, 110 flow. Second operand 3 states and 85 transitions. [2024-10-11 19:29:05,236 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 46 places, 38 transitions, 150 flow [2024-10-11 19:29:05,236 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 38 transitions, 149 flow, removed 0 selfloop flow, removed 1 redundant places. [2024-10-11 19:29:05,237 INFO L231 Difference]: Finished difference. Result has 45 places, 38 transitions, 91 flow [2024-10-11 19:29:05,237 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=107, PETRI_DIFFERENCE_MINUEND_FLOW=89, PETRI_DIFFERENCE_MINUEND_PLACES=43, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=38, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=37, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=91, PETRI_PLACES=45, PETRI_TRANSITIONS=38} [2024-10-11 19:29:05,238 INFO L277 CegarLoopForPetriNet]: 88 programPoint places, -43 predicate places. [2024-10-11 19:29:05,238 INFO L471 AbstractCegarLoop]: Abstraction has has 45 places, 38 transitions, 91 flow [2024-10-11 19:29:05,238 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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 19:29:05,238 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 19:29:05,238 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2024-10-11 19:29:05,239 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2024-10-11 19:29:05,239 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err4ASSERT_VIOLATIONMEMORY_LEAK === [thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 75 more)] === [2024-10-11 19:29:05,239 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 19:29:05,239 INFO L85 PathProgramCache]: Analyzing trace with hash -570477941, now seen corresponding path program 1 times [2024-10-11 19:29:05,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 19:29:05,240 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728163929] [2024-10-11 19:29:05,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 19:29:05,240 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 19:29:05,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 19:29:05,264 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 19:29:05,265 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 19:29:05,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728163929] [2024-10-11 19:29:05,265 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1728163929] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 19:29:05,265 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 19:29:05,266 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-11 19:29:05,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536002589] [2024-10-11 19:29:05,266 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 19:29:05,266 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-11 19:29:05,267 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 19:29:05,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-11 19:29:05,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-11 19:29:05,272 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 15 out of 107 [2024-10-11 19:29:05,272 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 45 places, 38 transitions, 91 flow. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 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 19:29:05,272 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 19:29:05,273 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 15 of 107 [2024-10-11 19:29:05,273 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-10-11 19:29:05,628 INFO L124 PetriNetUnfolderBase]: 3084/4310 cut-off events. [2024-10-11 19:29:05,628 INFO L125 PetriNetUnfolderBase]: For 104/104 co-relation queries the response was YES. [2024-10-11 19:29:05,636 INFO L83 FinitePrefix]: Finished finitePrefix Result has 8525 conditions, 4310 events. 3084/4310 cut-off events. For 104/104 co-relation queries the response was YES. Maximal size of possible extension queue 218. Compared 21269 event pairs, 2505 based on Foata normal form. 399/4499 useless extension candidates. Maximal degree in co-relation 8516. Up to 4101 conditions per place. [2024-10-11 19:29:05,728 INFO L140 encePairwiseOnDemand]: 105/107 looper letters, 28 selfloop transitions, 1 changer transitions 0/35 dead transitions. [2024-10-11 19:29:05,732 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 35 transitions, 143 flow [2024-10-11 19:29:05,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-11 19:29:05,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-10-11 19:29:05,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 75 transitions. [2024-10-11 19:29:05,735 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.2336448598130841 [2024-10-11 19:29:05,735 INFO L175 Difference]: Start difference. First operand has 45 places, 38 transitions, 91 flow. Second operand 3 states and 75 transitions. [2024-10-11 19:29:05,735 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 35 transitions, 143 flow [2024-10-11 19:29:05,736 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 35 transitions, 142 flow, removed 0 selfloop flow, removed 1 redundant places. [2024-10-11 19:29:05,736 INFO L231 Difference]: Finished difference. Result has 43 places, 35 transitions, 86 flow [2024-10-11 19:29:05,736 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=107, PETRI_DIFFERENCE_MINUEND_FLOW=84, PETRI_DIFFERENCE_MINUEND_PLACES=41, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=35, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=86, PETRI_PLACES=43, PETRI_TRANSITIONS=35} [2024-10-11 19:29:05,737 INFO L277 CegarLoopForPetriNet]: 88 programPoint places, -45 predicate places. [2024-10-11 19:29:05,739 INFO L471 AbstractCegarLoop]: Abstraction has has 43 places, 35 transitions, 86 flow [2024-10-11 19:29:05,740 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 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 19:29:05,740 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 19:29:05,740 INFO L204 CegarLoopForPetriNet]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2024-10-11 19:29:05,740 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2024-10-11 19:29:05,740 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 75 more)] === [2024-10-11 19:29:05,741 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 19:29:05,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1176533661, now seen corresponding path program 1 times [2024-10-11 19:29:05,742 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 19:29:05,744 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265054775] [2024-10-11 19:29:05,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 19:29:05,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 19:29:05,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-10-11 19:29:05,755 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2024-10-11 19:29:05,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-10-11 19:29:05,765 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2024-10-11 19:29:05,768 INFO L325 BasicCegarLoop]: Counterexample is feasible [2024-10-11 19:29:05,769 INFO L782 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (77 of 78 remaining) [2024-10-11 19:29:05,769 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (76 of 78 remaining) [2024-10-11 19:29:05,770 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (75 of 78 remaining) [2024-10-11 19:29:05,771 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (74 of 78 remaining) [2024-10-11 19:29:05,771 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (73 of 78 remaining) [2024-10-11 19:29:05,771 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (72 of 78 remaining) [2024-10-11 19:29:05,771 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (71 of 78 remaining) [2024-10-11 19:29:05,771 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (70 of 78 remaining) [2024-10-11 19:29:05,771 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (69 of 78 remaining) [2024-10-11 19:29:05,771 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (68 of 78 remaining) [2024-10-11 19:29:05,772 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err9REQUIRES_VIOLATIONMEMORY_DEREFERENCE (67 of 78 remaining) [2024-10-11 19:29:05,772 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err10REQUIRES_VIOLATIONMEMORY_DEREFERENCE (66 of 78 remaining) [2024-10-11 19:29:05,772 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err11REQUIRES_VIOLATIONMEMORY_DEREFERENCE (65 of 78 remaining) [2024-10-11 19:29:05,772 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err12REQUIRES_VIOLATIONMEMORY_DEREFERENCE (64 of 78 remaining) [2024-10-11 19:29:05,772 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err13REQUIRES_VIOLATIONMEMORY_DEREFERENCE (63 of 78 remaining) [2024-10-11 19:29:05,772 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err14REQUIRES_VIOLATIONMEMORY_DEREFERENCE (62 of 78 remaining) [2024-10-11 19:29:05,772 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err15REQUIRES_VIOLATIONMEMORY_DEREFERENCE (61 of 78 remaining) [2024-10-11 19:29:05,772 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (60 of 78 remaining) [2024-10-11 19:29:05,773 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (59 of 78 remaining) [2024-10-11 19:29:05,773 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (58 of 78 remaining) [2024-10-11 19:29:05,773 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (57 of 78 remaining) [2024-10-11 19:29:05,773 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (56 of 78 remaining) [2024-10-11 19:29:05,773 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (55 of 78 remaining) [2024-10-11 19:29:05,773 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (54 of 78 remaining) [2024-10-11 19:29:05,773 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (53 of 78 remaining) [2024-10-11 19:29:05,773 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err4ASSERT_VIOLATIONMEMORY_LEAK (52 of 78 remaining) [2024-10-11 19:29:05,773 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONMEMORY_LEAK (51 of 78 remaining) [2024-10-11 19:29:05,773 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (50 of 78 remaining) [2024-10-11 19:29:05,773 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (49 of 78 remaining) [2024-10-11 19:29:05,773 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (48 of 78 remaining) [2024-10-11 19:29:05,774 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (47 of 78 remaining) [2024-10-11 19:29:05,774 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (46 of 78 remaining) [2024-10-11 19:29:05,774 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (45 of 78 remaining) [2024-10-11 19:29:05,774 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (44 of 78 remaining) [2024-10-11 19:29:05,774 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (43 of 78 remaining) [2024-10-11 19:29:05,774 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (42 of 78 remaining) [2024-10-11 19:29:05,778 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (41 of 78 remaining) [2024-10-11 19:29:05,778 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err9REQUIRES_VIOLATIONMEMORY_DEREFERENCE (40 of 78 remaining) [2024-10-11 19:29:05,778 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err10REQUIRES_VIOLATIONMEMORY_DEREFERENCE (39 of 78 remaining) [2024-10-11 19:29:05,778 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err11REQUIRES_VIOLATIONMEMORY_DEREFERENCE (38 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err12REQUIRES_VIOLATIONMEMORY_DEREFERENCE (37 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err13REQUIRES_VIOLATIONMEMORY_DEREFERENCE (36 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err14REQUIRES_VIOLATIONMEMORY_DEREFERENCE (35 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err15REQUIRES_VIOLATIONMEMORY_DEREFERENCE (34 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (33 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (32 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (31 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (30 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (29 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (28 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (27 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (26 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (25 of 78 remaining) [2024-10-11 19:29:05,779 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err9REQUIRES_VIOLATIONMEMORY_DEREFERENCE (24 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err10REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err11REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err12REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err13REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err14REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr2Err15REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 78 remaining) [2024-10-11 19:29:05,780 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 78 remaining) [2024-10-11 19:29:05,781 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 78 remaining) [2024-10-11 19:29:05,781 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err4ASSERT_VIOLATIONMEMORY_LEAK (9 of 78 remaining) [2024-10-11 19:29:05,781 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 78 remaining) [2024-10-11 19:29:05,781 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 78 remaining) [2024-10-11 19:29:05,781 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 78 remaining) [2024-10-11 19:29:05,781 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 78 remaining) [2024-10-11 19:29:05,781 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 78 remaining) [2024-10-11 19:29:05,781 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 78 remaining) [2024-10-11 19:29:05,781 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 78 remaining) [2024-10-11 19:29:05,781 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 78 remaining) [2024-10-11 19:29:05,781 INFO L782 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err4ASSERT_VIOLATIONMEMORY_LEAK (0 of 78 remaining) [2024-10-11 19:29:05,781 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2024-10-11 19:29:05,782 INFO L407 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2024-10-11 19:29:05,783 WARN L239 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2024-10-11 19:29:05,783 INFO L484 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2024-10-11 19:29:05,846 INFO L143 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2024-10-11 19:29:05,850 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 158 places, 156 transitions, 348 flow [2024-10-11 19:29:05,862 INFO L124 PetriNetUnfolderBase]: 6/127 cut-off events. [2024-10-11 19:29:05,862 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2024-10-11 19:29:05,863 INFO L83 FinitePrefix]: Finished finitePrefix Result has 145 conditions, 127 events. 6/127 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 19. Compared 577 event pairs, 0 based on Foata normal form. 0/56 useless extension candidates. Maximal degree in co-relation 138. Up to 4 conditions per place. [2024-10-11 19:29:05,863 INFO L82 GeneralOperation]: Start removeDead. Operand has 158 places, 156 transitions, 348 flow [2024-10-11 19:29:05,865 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 117 places, 113 transitions, 247 flow [2024-10-11 19:29:05,866 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-10-11 19:29:05,869 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=None, 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;@367b6043, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-10-11 19:29:05,869 INFO L334 AbstractCegarLoop]: Starting to check reachability of 103 error locations. [2024-10-11 19:29:05,870 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2024-10-11 19:29:05,870 INFO L124 PetriNetUnfolderBase]: 0/9 cut-off events. [2024-10-11 19:29:05,871 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-11 19:29:05,871 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-11 19:29:05,871 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2024-10-11 19:29:05,871 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONMEMORY_LEAK === [thr2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 100 more)] === [2024-10-11 19:29:05,871 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-11 19:29:05,871 INFO L85 PathProgramCache]: Analyzing trace with hash 716348648, now seen corresponding path program 1 times [2024-10-11 19:29:05,871 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-11 19:29:05,872 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283565304] [2024-10-11 19:29:05,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-11 19:29:05,872 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-11 19:29:05,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-11 19:29:05,880 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 19:29:05,881 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-11 19:29:05,881 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283565304] [2024-10-11 19:29:05,881 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [283565304] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-11 19:29:05,881 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-11 19:29:05,881 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-11 19:29:05,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965021326] [2024-10-11 19:29:05,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-11 19:29:05,882 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-10-11 19:29:05,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-11 19:29:05,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-10-11 19:29:05,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-10-11 19:29:05,883 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 21 out of 156 [2024-10-11 19:29:05,884 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 117 places, 113 transitions, 247 flow. Second operand has 2 states, 2 states have (on average 23.0) internal successors, (46), 2 states have internal predecessors, (46), 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 19:29:05,885 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-11 19:29:05,885 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 21 of 156 [2024-10-11 19:29:05,885 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand